CS Fallback eRAN3.0 Feature Parameter Description Issue Date 04 2012-09-20 HUAWEI TECHNOLOGIES CO., LTD. Copyright © Huawei Technologies Co., Ltd. 2012. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd. Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders. Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations of any kind, either express or implied. The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute the warranty of any kind, express or implied. Huawei Technologies Co., Ltd. Address: Huawei Industrial Base Bantian, Longgang Shenzhen 518129 People's Republic of China Website: Email: http://www.huawei.com
[email protected] eRAN CS Fallback Contents Contents 1 Introduction ................................................................................................................................1-1 1.1 Scope ............................................................................................................................................ 1-1 1.2 Intended Audience......................................................................................................................... 1-1 1.3 Change History.............................................................................................................................. 1-1 2 Overview of CSFB.....................................................................................................................2-1 2.1 Network Architecture for CSFB to UTRAN/GERAN ...................................................................... 2-2 2.2 Network Architecture for CSFB to CDMA2000 1xRTT .................................................................. 2-4 3 End-to-End Procedures for CSFB ........................................................................................3-1 3.1 CSFB to UTRAN ........................................................................................................................... 3-1 3.1.1 Combined EPS/IMSI Attach Procedure ................................................................................ 3-1 3.1.2 CSFB Procedures for Mobile-originated Calls and Mobile-terminated Calls ....................... 3-2 3.1.3 CSFB Procedure for SMS .................................................................................................... 3-7 3.1.4 CSFB Procedure for Emergency Calls ................................................................................. 3-7 3.1.5 CSFB Procedure for LCS ..................................................................................................... 3-7 3.1.6 RAN Information Management Procedure ........................................................................... 3-8 3.2 CSFB to GERAN ........................................................................................................................... 3-8 3.2.1 Combined EPS/IMSI Attach Procedure ................................................................................ 3-8 3.2.2 CSFB Procedures for Mobile-originated Calls and Mobile-terminated Calls ....................... 3-9 3.2.3 CSFB Procedure for SMS .................................................................................................. 3-15 3.2.4 CSFB Procedure for Emergency Calls ............................................................................... 3-15 3.2.5 CSFB Procedure for LCS ................................................................................................... 3-15 3.2.6 RAN Information Management Procedure ......................................................................... 3-16 3.3 CSFB to CDMA2000 1xRTT ....................................................................................................... 3-16 3.3.1 Preregistration Procedure................................................................................................... 3-16 3.3.2 CSFB Procedure for Mobile-originated Calls ..................................................................... 3-17 3.3.3 CSFB Procedure for Mobile-terminated Calls .................................................................... 3-18 3.3.4 CSFB Procedure for SMS .................................................................................................. 3-20 3.3.5 CSFB Procedure for Emergency Calls ............................................................................... 3-20 4 CSFB at the eNodeB ................................................................................................................4-1 4.1 Triggering Phase of CSFB ............................................................................................................ 4-2 4.1.1 Choosing Between a Blind Handover and a Measurement-based Handover...................... 4-2 4.1.2 Selecting Frequencies to Measure or a Target Cell (Without an LAI) .................................. 4-2 4.1.3 Selecting Frequencies to Measure or a Target Cell (With an LAI) ....................................... 4-3 4.2 Measurement Phase of CSFB ...................................................................................................... 4-4 4.2.1 Measurement Configuration ................................................................................................. 4-4 4.2.2 Measurement Reporting ....................................................................................................... 4-4 4.3 Decision Phase of CSFB ............................................................................................................... 4-5 4.4 Execution Phase of CSFB ............................................................................................................. 4-5 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. i ....1..........................5 Activation Observation .....................................6 CSFB with LAI to UTRAN ................. 7-1 7.........6 Deactivation ................................................ Ltd................ 7-3 7................. 7-6 7.2..........3 CSFB to CDMA2000 1xRTT.................................................... 4-6 5 Related Features .......................................................3 CSFB to CDMA2000 1xRTT.......... 5-1 5................................4...........................................5-1 5......................................................................1 Deployment Requirements ...........................................................3..... 7-2 7.. 6-1 7 Engineering Guidelines ...............5...............................................................................4....1 Impact on System Capacity.....1 Required Features.7 CSFB with LAI to GERAN ..................................................................................................... 7-18 7........................... 7-18 7.....................................................................................................2........................................3 Precautions ......3..........3......................................... 7-16 7....................................5 Activation Observation .................... 7-1 7.......................................................................................1 CSFB to UTRAN ...........1 Deployment Requirements .................2 Data Preparation......................................................................4 Deploying CSFB to GERAN ......................................................1................1 Deployment Requirements .... 7-12 7................................................ ii ...5 Flash CSFB to GERAN .. 7-1 7......................................................................................................................................................................................................................7 CSFB with LAI to GERAN ............................................................................4.............................................................................................. 7-2 7.................... 7-20 7..................................................................................................4..............2 Data Preparation...................................2...1...............2 CSFB to GERAN .........3.............................4 Initial Configuration .........................................................1..........................4 Flash CSFB to UTRAN ......................................................1.......................................................................5 CSFB Exception Handling ........................................................... 7-6 7...............2.................................................... 7-1 7............ 7-15 7........... 5-1 5......................6-1 6.............................................................................................................. 7-5 7........6 Deactivation .......................................3.................................................................................................................................................................................................................................4...............................................................................2................................3.7-1 7......................................................3 Precautions .................................................................................... 7-8 7............................. 7-15 7..5 Deploying CSFB to CDMA2000 1xRTT ...................................1..................................... 7-4 7.......................................4 Initial Configuration ........................................................2.................................................................................................. 7-11 7.......................... 7-2 7. 7-15 7......................................................................................2 Mutually Exclusive Features ......................................................................................................................................eRAN CS Fallback Contents 4..........................1 CSFB to UTRAN ..........................................................................................................................................2 CSFB to GERAN ............................................................. 5-1 6 Impact on the Networks .................. 7-20 7................. 7-20 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co..............................................................3 Deploying CSFB to UTRAN ............................................................................................................ 7-9 7........................ 6-1 6.................................................5 Flash CSFB to GERAN .......................................2........................ 7-2 7.................................... 7-1 7................................................................................ 7-11 7.................................................... 7-20 7........6 CSFB with LAI to UTRAN ................ 7-7 7................................1 When to Use CSFB ........................4............... 7-2 7..................... 7-8 7.............................................1...................................................2 Information to Be Collected ......2 Impact on Network Performance...........................................3 Affected Features .................4 Flash CSFB to UTRAN ... .................................. 7-27 7................................................................................................................................................... 7-20 7............................................................................................ 7-29 7.........8...................................................................................................................................7......6................ 7-41 7.......................................3 Precautions .....................................................................4 Initial Configuration .................................................6 Deactivation ...............................................7 Deploying Flash CSFB to GERAN .....................................1 Deployment Requirements ..........................8............................................. 7-42 7........................................................ 7-27 7.............................. 7-34 7..6 Deactivation .................................................................................................6...................................5 Activation Observation ..................5.....................................9................4 Initial Configuration .9..............................10................................................9....................... 7-29 7.....7............................1 Deployment Requirements ................................2 Data Preparation................. 7-24 7.......................................................5 Activation Observation ..................... 7-34 7..............................................................................................7...................................................................................................................................................8................................................................................................... 7-36 7............................................................................................. 7-34 7.......6..10....11....................6...............11.......................................7.............. 7-36 7.....3 Precautions ................................8 Deploying CSFB with LAI to UTRAN ................................................................................................ 7-36 7..................................4 Initial Configuration ................... 7-35 7. 7-32 7.....................................................6 Deactivation ........................................................8..............................................10.............................. 7-43 7...................6............................ 7-24 7................. 7-29 7...............................5....................................................................................................... 7-34 7.................... 7-32 7.. 7-36 7...........................................................9.........................................8...........5..........................................................................................................................................6 Deactivation ........................8............................6............................................................................................................................... 7-35 7............11 Troubleshooting .........................2 Fault 2 ....................... 7-34 7............................. 7-43 7............................................................................ 7-24 7................ 7-29 7................................. 7-29 7..................3 Fault 3 ......................... 7-34 7......2 Parameter Optimization .............. 7-22 7.......eRAN CS Fallback Contents 7.........................................3 EBC Description ........ 7-35 7........................................2 Data Preparation........................................................................................6 Deploying Flash CSFB to UTRAN .........................1 Deployment Requirements ............................................................................................................................................................................................................5.....5 Activation Observation .5 Activation Observation ................4 Initial Configuration ........................................................................................................................................... Ltd...............1 Fault 1 ......... 7-35 7......................................................................3 Precautions .......................................................9 Deploying CSFB with LAI to GERAN ..4 Initial Configuration ...... 7-24 7................................................................................................................. 7-22 7.........................5............... 7-36 7...1 Deployment Requirements ...2 Data Preparation................................... 7-34 7...11....9................................... 7-36 7...2 Data Preparation....................................9... 7-37 7.....4 CS Fallback with LAI to UTRAN .....................................................7.............................................................. 7-36 7............10 Performance Optimization .........................................7....3 Precautions .................................................................. iii .................................................................. 7-42 7............6 Deactivation ............................. 7-25 7..11..........................2 Data Preparation.....3 Precautions ......................................................1 Monitoring ...................... 7-44 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.................................................................................5 Activation Observation ..................... ..........................................................................11-1 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co....................................................................................................................................................11.........................................................8-1 9 Counters .....................................................................................10-1 11 Reference Documents ..... 7-44 8 Parameters....................9-1 10 Glossary ..................................................................................... iv ............................................5 CS Fallback with LAI to GERAN .....................................eRAN CS Fallback Contents 7........ Ltd............................. the updates will be described in the product documentation delivered with the latest software release. It also provides engineering guidelines for setting the essential parameters related to CSFB." Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.. Ltd. Editorial change: refers to a change in wording or the addition of information that was not described in the earlier version.eRAN CS Fallback 1 Introduction 1 Introduction 1.0.2 Intended Audience This document is intended for: Personnel who need to understand CSFB Personnel who work with Huawei Long Term Evolution (LTE) products 1.0 includes the following changes. alarms. and it illustrates the functions provided by Huawei E-UTRAN NodeBs (eNodeBs) during CSFB procedures. Any managed objects (MOs).3 Change History This section provides information about the changes in different document versions. Change Type Feature change Editorial change Change Description None Parameter Change None Modified some descriptions of initial configuration in chapter None 7 "Engineering Guidelines. issue 04 (2012-09-20) of eRAN3. 1. Document Issues The document issues are as follows: 04 (2012-09-20) 03 (2012-06-30) 02 (2012-05-11) 01 (2012-03-30) Draft A (2012-01-10) 04 (2012-09-20) Compared with issue 03 (2012-06-30) of eRAN3. parameters. In the event of updates. There are two types of changes.1 Scope This document describes the principles and procedures of Circuit Switched Fallback (CSFB). which are defined as follows: Feature change: refers to a change in the CSFB feature of a specific product version. or counters described in this document correspond to the software release delivered with this document. 1-1 . " parameter.6 "RAN Information Management Procedure" and 3. 1-2 . draft A (2012-01-10) of eRAN3." Revised chapter 7 "Engineering Guidelines. Ltd.0. Compared with issue 02 (2011-09-30) of eRAN2." None Editorial change Draft A (2012-01-10) This is a draft. For details. Change Type Feature change Change Description Parameter Change Modified the mechanism for an eNodeB to select Added the CsPriority frequencies to measure or a target cell. Change Type Feature change Change Description Parameter Change Modified the RAN information management (RIM) None procedure during which the eNodeB obtains the system information of the neighboring GERAN or UTRAN cells.1. see section 4.4 "Execution Phase of CSFB. issue 03 (2012-06-30) of eRAN3.0 includes the following changes. see sections 3.. issue 01 (2012-03-30) of eRAN3.1.1.0.6 "RAN Information Management Procedure.0.1. section 4.2 "Selecting Frequencies to FreqLayerSwtich Measure or a Target Cell (Without an LAI)." Modified some descriptions in sections 4. Compared with draft A (2012-01-10) of eRAN3. Change Type Feature change Change Description Parameter Change Added the UTRAN frequency layer measurement function. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.2.0 includes the following changes. For details. issue 02 (2012-05-11) of eRAN3." None Editorial change 02 (2012-05-11) Compared with issue 01 (2012-03-30) of eRAN3. see parameter.0 includes the following changes.2 "Selecting Frequencies to Measure or a Target Cell (Without an LAI). None Editorial change 01 (2012-03-30) This is the first official release.eRAN CS Fallback 1 Introduction 03 (2012-06-30) Compared with issue 02 (2012-05-11) of eRAN3.1 "Choosing Between a Blind Handover and a Measurement-based Handover" and 4.2.0 includes the following changes. Modified some descriptions. Added the For details. see sections 4." Editorial change Optimized the organization and description of this document.1.3 "Selecting Frequencies to Measure or a Target Cell (With an LAI) " and 4. For details." None Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.eRAN CS Fallback 1 Introduction Change Type Feature change Change Description Parameter Change Added the description of how the eNodeB performs CSFB None based on an LAI. Ltd. 1-3 . Added chapters 5 "Related Features" and 6 "Impact on the Networks.3 "Decision Phase of CSFB.. better utilizing legacy CS networks. Functions involving the SGs interface include combined attach. and deployment costs of the two methods are well weighed.eRAN CS Fallback 2 Overview of CSFB 2 Overview of CSFB This chapter illustrates the network architectures for CSFB to UTRAN/GERAN/CDMA2000 1xRTT and describes the function of each network element (NE). CSFB is chosen to serve as an interim solution for CS service access before mature commercial use of IMS. UEs fall back to CS networks before CS sessions are set up. The SGs interface is between an MSC and a mobility management entity (MME). If an MSC pool is used in the legacy CS network. NOTE EPS: evolved packet system UTRAN: universal terrestrial radio access network GERAN: GSM/EDGE radio access network CDMA2000 1xRTT: CDMA2000 1x Radio Transmission Technology CS: circuit switched PS: packet switched VoIP: voice over IP IMS: IP multimedia subsystem UE: user equipment CSFB enables E-UTRAN UEs to fall back to CS networks to receive CS services. Ltd. all mobile switching centers (MSCs) that serve overlapping areas with the E-UTRAN coverage must be upgraded to support functions involving the SGs interface. and short message service (SMS). After the technological maturity. CSFB and VoIP over IMS are the two standard solutions to provide CS services for E-UTRAN UEs. operators who own a mature UTRAN.. paging. CSFB applies to scenarios in which the coverage area of the UTRAN/GERAN/CDMA2000 1xRTT network is the same as or includes that of the E-UTRAN. CSFB is a session setup procedure. In the early phase of EPS construction. Examples of CS services include voice services and location services (LCS). It requires a simpler network architecture compared with VoIP over IMS. GERAN. To implement CSFB. The optional features addressed in this document are as follows: LOFD-001033 CS Fallback to UTRAN LOFD-001034 CS Fallback to GERAN LOFD-001035 CS Fallback to CDMA2000 1xRTT LOFD-001052 Flash CS Fallback to UTRAN LOFD-001053 Flash CS Fallback to GERAN LOFD-001068 CS Fallback with LAI to UTRAN LOFD-001069 CS Fallback with LAI to GERAN Table 2-1 lists the optional features addressed in this document and the corresponding chapters describing related principles and algorithms. industry chain. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. the upgrade of one or several MSCs in the pool is sufficient. and they always stay in the CS networks during the CS sessions. and LAU is short for location area update). or CDMA2000 1xRTT network can protect their investments in legacy CS networks and reduce their investments in the EPS by using legacy CS networks to provide CS services and using the EPS to provide PS services. From a technological perspective. combined TAU/LAU (TAU is short for tracking area update. 2-1 . .1 Network Architecture for CSFB to UTRAN/GERAN To implement CSFB to UTRAN/GERAN. the MME performs a UE location update over the SGs interface so that the core network of the UTRAN or GERAN learns about the UE location.3 "Selecting Frequencies to Measure or a Target Cell (With an LAI)" 4. Then.1.. Figure 2-1 Network architecture for CSFB to UTRAN/GERAN SGSN: serving GPRS support node After a UE is powered on in the E-UTRAN as shown in Table 2-2.3 "Selecting Frequencies to Measure or a Target Cell (With an LAI)" LOFD-001068 CS 3. 3.1. an SGs interface is required between the MME and the MSC server. 2-2 .2 "CSFB to GERAN" 3.1 "CSFB to UTRAN" 3.2.1 "CSFB to UTRAN" Fallback with LAI to UTRAN LOFD-001069 CS 3..2 "CSFB to GERAN" Fallback with LAI to GERAN 2.. Ltd.eRAN CS Fallback 2 Overview of CSFB Table 2-1 Optional features related to CSFB and corresponding chapters Feature LOFD-001033 CS Fallback to UTRAN LOFD-001034 CS Fallback to GERAN LOFD-001035 CS Fallback to CDMA2000 1xRTT LOFD-001052 Flash CS Fallback to UTRAN LOFD-001053 Flash CS Fallback to GERAN Its Basic Principles Are Described in.3 "CSFB to CDMA2000 1xRTT" 3. it initiates a combined EPS/IMSI attach procedure..6 "RAN Information Management Procedure" Its Algorithm Details Are Described in. 4 "CSFB at the eNodeB" 4 "CSFB at the eNodeB" 4 "CSFB at the eNodeB" 4 "CSFB at the eNodeB" 4 "CSFB at the eNodeB" 4.6 "RAN Information Management Procedure" 3. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Figure 2-2 shows the network architecture for CSFB to UTRAN/GERAN.1. and combined TAU/LAU. Supports combined EPS/IMSI attach. CSFB-capable UEs must support SMS over SGs. such as PS redirection and PS handover. Supports SMS over SGs. Supports SMS over SGs. Performs public land mobile network (PLMN) selection and reselection. Forwards paging messages transmitted through the SGs interface. or both. When a mobile-originated or mobile-terminated CS service is initiated. NOTE CCO: cell change order NACC: network assisted cell change RIM: RAN information management MSC Supports combined EPS/IMSI attach. Transmits messages related to combined attach and combined TAU/LAU. Ltd. the E-UTRAN works with other elements in the networks to perform CSFB. and combined TAU/LAU.eRAN CS Fallback 2 Overview of CSFB If a UE is camping on an E-UTRAN cell. MME Supports the SGs interface to the MSC. Supports the ability to forward paging messages delivered by the MSC. Selects the location area identity (LAI) based on the tracking area identity (TAI) of the serving cell. they are transparent to the E-UTRAN (the E-UTRAN is unaware of them). 2-3 . Supports CSFB mechanisms. Therefore. Supports combined EPS/IMSI attach. Transmits SMS messages. Table 2-2 Elements of the network architecture for CSFB to UTRAN/GERAN Element SGs interface Function Acts as an interface between the MME and the MSC server. Supports RIM if flash CSFB or CCO with NACC is used as the CSFB mechanism. combined EPS/IMSI detach. which allows for simultaneous UE location updates both in the MME and in the core network of the UTRAN or GERAN. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. NOTE UE IMSI is short for international mobile subscriber identity. The combined EPS/IMSI attach and combined TAU/LAU procedures are performed by exchanging non-access stratum (NAS) messages. Table 2-2 describes the elements of the network architecture for CSFB to UTRAN/GERAN. Assists mobility management and paging between the EPS and the CS network. GERAN. Is capable of accessing the EPS and accessing the UTRAN. it periodically initiates a combined TAU/LAU procedure. combined EPS/IMSI detach.. but UEs that support SMS over SGs are not necessarily CSFB-capable. Routes CS signaling. Supports RIM if flash CSFB or CCO with NACC is used as the CSFB mechanism. 2-4 . in addition to PS redirection. Selects target cells for CSFB for E-UTRAN UEs. if flash CSFB is used as the CSFB mechanism NOTE The UTRAN and GERAN do not need to provide extra functions to support PS redirection. if flash CSFB is used as the CSFB mechanism − CCO − RIM UTRAN/GERAN Supports one or more of the following functions: Incoming handovers from the E-UTRAN.eRAN CS Fallback 2 Overview of CSFB Element E-UTRAN Function Forwards paging messages related to CSFB. This CSFB function is implemented based on the S102 interface between the MME and the 1xCS IWS. if NACC is used as the CSFB mechanism for acquiring the system information of UTRAN or GERAN cells. The S102 interface provides a tunnel between the MME and the 1xCS IWS to relay 3GPP2 1xCS signaling. in addition to PS redirection. 2. The GERAN does not need to provide extra functions to support CCO without NACC. NOTE ISR is a mechanism for reducing the inter-RAT cell reselection signaling of a UE in idle mode. if CCO without NACC is used as the CSFB mechanism.401. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. if PS handover is used as the CSFB mechanism RIM for delivering the system information of GERAN cells to eNodeBs. if PS redirection is used as the CSFB mechanism handover to UTRAN or GERAN. see 3GPP TS 23.2 Network Architecture for CSFB to CDMA2000 1xRTT Figure 2-2 shows the network architecture for CSFB to CDMA2000 1xRTT. if NACC is used as the CSFB mechanism RIM for delivering the system information of UTRAN or GERAN cells to eNodeBs. SGSN Does not activate Idle Mode Signaling Reduction (ISR) during the combined RAU/LAU procedure initiated by the UE. Supports one or more of the following functions: − PS − PS redirection to UTRAN or GERAN. Ltd. if PS handover is used as the CSFB mechanism without NACC to GERAN. RAU is short for routing area update.. For details about ISR. RIM for acquiring the system information of GERAN cells. RAT is short for radio access technology. 1xCS IWS is short for Circuit Switched Fallback Interworking Solution Function for 3GPP2 1xCS. Ltd. When a mobile-originated or mobile-terminated CS service is initiated. the MME is informed of the UE's CSFB capability. UE MME Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. the serving E-UTRAN cell broadcasts system information to indicate whether the E-UTRAN supports CSFB to CDMA2000 1xRTT. Is capable of accessing the EPS and CDMA2000 1xCS domain. If the E-UTRAN supports CSFB to CDMA2000 1xRTT. After the preregistration. Provides a tunnel to carry 1xCS signaling. the E-UTRAN works with other elements in the networks to perform CSFB. Supports mobile-originated and mobile-terminated SMS over S102. as shown in Figure 2-2.eRAN CS Fallback 2 Overview of CSFB Figure 2-2 Network architecture for CSFB to CDMA2000 1xRTT S-GW: serving gateway P-GW: PDN gateway After a UE is powered on and attached to the evolved packet core (EPC). Preregisters with the CDMA2000 1xCS domain while camping on an E-UTRAN cell and reregisters with the CDMA2000 1xCS domain while moving. the CDMA2000 1xCS domain is informed of the UE location.. Then. the UE initiates preregistration with the CDMA2000 1xCS domain through the E-UTRAN and MME. and performs tunnel reestablishment. Sends and receives 1xCS signaling over the S102 interface. Table 2-3 Elements of the network architecture for CSFB to CDMA2000 1xRTT Element S102 interface Function Acts as an interface between the MME and the 1xCS IWS. buffers data. Supports CSFB mechanisms. 2-5 . Table 2-3 describes the elements of the network architecture for CSFB to CDMA2000 1xRTT. Redirects inter-MME S102 tunnels in the case of MME relocation. Transmits paging messages from the 1xCS domain.. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. 2-6 .eRAN CS Fallback 2 Overview of CSFB Element E-UTRAN Function Broadcasts system information that contains CDMA2000 1xCS domain information to trigger UEs' preregistration with the CDMA2000 1xCS domain. Transmits 1xCS signaling. Ltd. Huawei provides the following mechanisms for eNodeBs to perform CSFB to UTRAN. or CDMA2000 1xRTT for mobile-originated calls and mobile-terminated calls: PS redirection PS handover CCO with or without NACC (CCO/NACC) 3. Therefore.1 CSFB to UTRAN 3.1.eRAN CS Fallback 3 End-to-End Procedures for CSFB 3 End-to-End Procedures for CSFB This chapter describes the functions that a Huawei eNodeB performs during end-to-end procedures for CSFB. GERAN. Figure 3-1 Combined EPS/IMSI attach procedure HSS: home subscriber server VLR: visitor location register Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. 3-1 . Ltd.. including the following: Combined EPS/IMSI attach Preregistration CSFB procedure for mobile-originated calls CSFB procedure for mobile-terminated calls CSFB procedure for SMS CSFB procedure for emergency calls CSFB procedure for LCS Regarding the capabilities of UEs and networks. this procedure is transparent to the eNodeBs. the UE initiates a combined EPS/IMSI attach procedure. After a CSFB-capable UE is powered on in the E-UTRAN. as shown in Figure 3-1.1 Combined EPS/IMSI Attach Procedure The combined EPS/IMSI attach procedure is performed by exchanging NAS messages. For details. 6. requesting a combined EPS/IMSI attach procedure. and they are compared here based on the same mode. and PS service interruption time. and location update type. If multiple PLMNs are available for the CS domain. The preceding mechanisms can be based on the measurement or blind mode. Ltd. the following mechanisms are available for an eNodeB to perform CSFB to UTRAN: CSFB based on PS handover CSFB based on PS redirection Flash CSFB Table 3-1 lists the advantages and disadvantages of the preceding mechanisms in terms of impacts on the UEs. CS service access delay. 3-2 . 4. 2.1. the MME selects a CS PLMN based on the selected PLMN information reported by the eNodeB. A box of dashes denotes an optional procedure.2 CSFB Procedures for Mobile-originated Calls and Mobile-terminated Calls Based on the capabilities of UEs and networks. If the network supports SMS over SGs but not CSFB.eRAN CS Fallback NOTE 3 End-to-End Procedures for CSFB The symbols that appear in signaling procedure figures are explained as follows: An arrow denotes the transmission of a message. The MME allocates an LAI to the UE. The MSC/VLR performs the location update procedure in the CS domain. 3.401. IMSI. which contains the new LAI. the MME sends the MSC/VLR a Location Update Request message. Table 3-1 Comparison of fallback mechanisms for CSFB to UTRAN Fallback Mechanism CSFB based on PS handover CSFB based on PS redirection Flash CSFB Impact on the Networks Complex Simple Medium Impact on the CS Service UEs Access Delay Complex Simple Medium Short Long Short PS Service Interruption Time Short Long Medium Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. MME name. 5. The EPS attach procedure is performed in the same way as it is performed within the LTE system. A plain box denotes a mandatory procedure. and then it finds the MSC/VLR for the UE based on the LAI. 3. The UE is informed that the combined EPS/IMSI attach procedure is successful. see 3GPP TS 23. The combined EPS/IMSI attach procedure is described as follows: 1. Then. The UE sends an Attach Request message to the MME. The location update procedure is successful. This message also indicates whether the CSFB or SMS over SGs function is required. impacts on the networks. The MSC/VLR responds with a Location Update Accept message that contains information about the VLR and temporary mobile subscriber identity (TMSI).. The message indicates that the combined EPS/IMSI attach procedure is successful but only SMS services are supported. the message transmitted to the UE contains the information element (IE) SMS-only. 1 "Choosing Between a Blind Handover and a Measurement-based Handover. CSFB Procedure for Mobile-originated Calls This section describes the procedure for CSFB to UTRAN based on PS handover for mobile-originated calls. The eNodeB initiates the preparation phase for a PS handover. see section 4. and algorithm policies." Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. If the MME supports the LAI-related feature. 3. Ltd." 4. the MME also delivers the LAI to the eNodeB. 3-3 .1. The eNodeB determines whether to perform a blind handover based on the UE capabilities. the UE is transferred from the E-UTRAN to the UTRAN by performing a PS handover. If the preparation is successful. parameters settings. For details.. see chapter 4 "CSFB at the eNodeB. 2. The MME sends an S1-AP Request message to instruct the eNodeB to initiate a CSFB procedure. the eNodeB instructs the UE to perform a handover. For details. The UE sends the MME an NAS message Extended Service Request to initiate a CS service. It then initiates a CS service in the UTRAN. Figure 3-2 CSFB to UTRAN based on PS handover for mobile-originated calls RNC: radio network controller The procedure is described as follows: 1.eRAN CS Fallback 3 End-to-End Procedures for CSFB CSFB Based on PS Handover During CSFB based on PS handover. NOTE The eNodeB selects a fallback mechanism and a target cell using the CSFB algorithm. as shown in Figure 3-2. the MME sends the UE an NAS message to inform the UE of an incoming call from the CS domain. 3. CSFB Procedure for Mobile-terminated Calls This section describes the procedure for CSFB to UTRAN based on PS handover for mobile-terminated calls. path switching. Then. 3-4 . and RAU. Figure 3-3 CSFB to UTRAN based on PS handover for mobile-terminated calls The procedure is described as follows: 1. as shown in Figure 3-3.401. the UE may initiate a CS call establishment procedure with an LAU or combined RAU/LAU procedure in the UTRAN. The MME instructs the eNodeB over the S1 interface to perform CSFB. 2. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.. The only difference is that the UE sends a Paging Response message from the UTRAN cell. The follow-up procedures are performed for the PS handover. the MME sends a Paging message to the eNodeB. The subsequent steps are similar to steps 3 through 6 in the procedure for CSFB to UTRAN based on PS handover for mobile-originated calls. see Mobility Management in Connected Mode Feature Parameter Description and 3GPP TS 23. Ltd. After the handover. Then the eNodeB sends a Paging message over the Uu interface to inform the UE of an incoming call from the CS domain. the UE is in active mode. 4. This step is performed together with step 5. These procedures include data forwarding. The UE sends an Extended Service Request message containing a CS Fallback Indicator after receiving the paging message from the CS domain. 6.eRAN CS Fallback 3 End-to-End Procedures for CSFB 5. NOTE For details about the PS handover procedure. The MSC sends a Paging Request message from the CS domain to the MME over the SGs interface. either of the following occurs: − If − If the UE is in idle mode. The eNodeB determines whether to perform a blind handover based on the UE capabilities. reducing the time for the UE to search for a target network." Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.1. parameters settings. The UE sends the MME an NAS message Extended Service Request to initiate a CS service. and then it sends an RRC Connection Release message to release the UE. and algorithm policies.. Then. The eNodeB sends an RRC Connection Release message to instruct the UE to perform a redirection. NOTE The eNodeB selects a fallback mechanism and a target cell using the CSFB algorithm. 2. see chapter 4 "CSFB at the eNodeB. the eNodeB receives a CS Fallback Indicator. After selecting the UTRAN. 3. Ltd. CSFB Procedure for Mobile-originated Calls This section describes the procedure for CSFB to UTRAN based on PS redirection for mobile-originated calls. the UE is an initially accessing user. For details. Then. the UE acquires the system information of a UTRAN cell. the UE performs initial access to the cell to initiate a CS service." 4. 3-5 .eRAN CS Fallback 3 End-to-End Procedures for CSFB CSFB Based on PS Redirection During CSFB based on PS redirection. see section 4. the eNodeB initiates an S1 UE context release procedure. For details. If the MME supports the LAI-related feature. The MME sends an S1-AP Request message to instruct the eNodeB to initiate a CSFB procedure. For the UTRAN. Figure 3-4 CSFB to UTRAN based on PS redirection for mobile-originated calls The procedure is described as follows: 1. The message contains information about a target UTRAN frequency.1 "Choosing Between a Blind Handover and a Measurement-based Handover. The message contains information about a target UTRAN frequency. as shown in Figure 3-4. the MME also delivers the LAI to the eNodeB. 1. see section 4. Flash CSFB During the flash CSFB procedure. Then. Figure 3-5 Flash CSFB to UTRAN for mobile-originated calls The procedure is described as follows: 1. The message contains information about a target UTRAN frequency. 6. In this way. CSFB Procedure for Mobile-terminated Calls In a mobile-terminated call. CSFB Procedure for Mobile-originated Calls This section describes the procedure for flash CSFB to UTRAN for mobile-originated calls.. the UE can quickly access the target UTRAN without the need to perform the procedure for acquiring system information of the target UTRAN cell. the UE can directly initiate a CS service in the UTRAN cell.1 "Choosing Between a Blind Handover and a Measurement-based Handover. The MME sends an S1-AP Request message to instruct the eNodeB to initiate a CSFB procedure. as shown in Figure 3-3. The UE sends the MME an NAS message Extended Service Request to initiate a CS service. as well as one or more physical cell identities and their associated system information. the MME also delivers the LAI to the eNodeB. the eNodeB receives a CS Fallback Indicator. and algorithm policies. 2. the MSC sends a Paging Request message from the CS domain to the MME over the SGs interface." Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. If the MME supports the LAI-related feature. The UE initiates a CS call establishment procedure in the target UTRAN cell. Then.eRAN CS Fallback 3 End-to-End Procedures for CSFB 5. as shown in Figure 3-5. or both an RAU and an LAU in the target cell. and then it sends an RRC Connection Release message to release the UE. The subsequent steps are the same as the steps in the procedure for CSFB to UTRAN based on PS redirection for mobile-originated calls. 3. the MME or the eNodeB initiates a paging procedure for the UE. The UE may initiate an LAU. 3-6 . Ltd. a combined RAU/LAU. For details. parameters settings. The eNodeB determines whether to perform a blind handover based on the UE capabilities. the MME performs an attach or combined TAU/LAU procedure to inform the UE of the LCS capability of the EPS. the MME or the eNodeB initiates a paging procedure for the UE. which contains an IE to inform the eNodeB of the service type. As the SMS service is transparent to the eNodeB. CSFB Procedure for Mobile-terminated Calls In a mobile-terminated call. Then. or both an RAU and an LAU in the target cell. Emergency calls take precedence over other services in the eNodeB. For details. Upon receiving the information. see section 3." The system information of the target cell is acquired during the RIM procedure.. 3. 6. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. see 3GPP TS 23.272. For details about admission and preemption of emergency calls. Because a UE does not require fallback to the UTRAN to perform an SMS service. see chapter 4 "CSFB at the eNodeB. the RNC preferentially processes this call when using related algorithms such as admission control. a combined RAU/LAU.1. The eNodeB sends the RNC a handover request with the IE CSFB high priority in the IE Source to Target Transparent Container. Then. The UTRAN will treat this call as a common CS emergency call. Ltd. the MSC sends a Paging Request message from the CS domain to the MME over the SGs interface. The UE sends an RRC Connection Request message over the Uu interface or the MME sends an S1-AP message. 3. This request informs the RNC that a CSFB procedure is required for an emergency call. the eNodeB initiates an S1 UE context release procedure. For details. If PS handover is used for CSFB for emergency calls. the eNodeB does not restrict the cells in the handover restriction list when selecting the target cell. the UE falls back to the UTRAN to initiate LCS under the control of the EPS. 3. the procedure is not described in this document. the SMS over SGs function can be used in a place covered only by the E-UTRAN.3 CSFB Procedure for SMS SMS services are unknown to the eNodeB because SMS messages are encapsulated in NAS messages." 5. the RRC Connection Request message that the UE sends when accessing the UTRAN contains the indication of an emergency call.1. The eNodeB sends an RRC Connection Release message to instruct the UE to perform a redirection.4 CSFB Procedure for Emergency Calls The CSFB procedure for an emergency call is the same as the CSFB procedure for a normal mobile-originated voice service. as shown in Figure 3-3.6 "RAN Information Management Procedure. The CSFB procedure is the same as the procedure for CSFB to UTRAN for mobile-originated calls. The UE initiates a CS call establishment procedure in the target UTRAN cell. SMS messages are exchanged between the MME and the MSC over the SGs interface.1. If the EPS does not support LCS. as well as one or more physical cell identities and their associated system information. 3-7 .5 CSFB Procedure for LCS After a UE initiates an LCS request. The message contains information about a target UTRAN frequency. NOTE The eNodeB selects a fallback mechanism and a target cell using the CSFB algorithm. The subsequent steps are the same as the steps in the procedure for flash CSFB to UTRAN for mobile-originated calls.1. The UE may initiate an LAU. For details about the procedure. see Emergency Call Feature Parameter Description. During interworking with the UTRAN.eRAN CS Fallback 3 End-to-End Procedures for CSFB 4. If redirection is used for CSFB for emergency calls. The RIM procedure and parameter settings are described as follows: If a neighboring UTRAN cell supports the Multiple Report mode and UTRAN_RIM_SWITCH under the RimSwitch parameter is turned on. the eNodeB obtains the system information of the neighboring UTRAN cells by performing an RIM procedure in Single Report mode. exchanges information between E-UTRAN and GERAN/UTRAN through the core networks. The UE performs the LCS service after the fallback to the UTRAN. and RNC/base station controller (BSC). and it also sends a report to the source each time the system information changes. and it acquires the system information of UTRAN cells during the RIM procedure. The CSFB procedure is the same as the procedure for CSFB to UTRAN for mobile-terminated calls. For details. Figure 3-6 RIM procedure The RIM procedure supports two information exchange modes: Single Report and Multiple Report. If flash CSFB to UTRAN is enabled and UTRAN_RIM_SWITCH under the RimSwitch parameter is turned off. The Multiple Report mode is enabled or disabled by setting the RimSwitch parameter. while the Single Report mode is not configurable. the RIM procedure in Multiple Report mode is performed as follows: After an external UTRAN cell corresponding to the neighboring UTRAN cell is configured. For details about the CSFB procedure for LCS.eRAN CS Fallback 3 End-to-End Procedures for CSFB If the UTRAN initiates an LCS request towards a UE camping on an E-UTRAN cell.1 Combined EPS/IMSI Attach Procedure The combined EPS/IMSI attach procedure for CSFB to GERAN is the same as that for CSFB to UTRAN. In Single Report mode. The Huawei eNodeB supports the two information exchange modes. the eNodeB sends a request for system information to the neighboring UTRAN cell. the MSC sends an LCS indicator to the MME over the SGs interface.1. After the neighboring UTRAN cell receives the request or the system information changes. 3-8 . SGSN. Then. see section 8c in 3GPP TS 48.018.272 and LCS Feature Parameter Description. MME. 3. the target responds with a report after receiving a request from the source. the MME and the SGSN transfer but do not resolve information. The procedure involves the eNodeB.2." Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. 3.1 "Combined EPS/IMSI Attach Procedure. this cell sends the system information to the eNodeB. In Multiple Report mode. Ltd. as shown in Figure 3-6.1. see section 3. see 3GPP TS 23. the MME instructs the eNodeB to perform CSFB for the UE. and then the target responds with a single report. the source sends a request. Among these NEs.. For details.6 RAN Information Management Procedure The RIM procedure.2 CSFB to GERAN 3. eRAN CS Fallback 3 End-to-End Procedures for CSFB 3. For the GERAN.2 CSFB Procedures for Mobile-originated Calls and Mobile-terminated Calls Based on the capabilities of UEs and networks. and PS service interruption time. CSFB Procedure for Mobile-originated Calls This section describes the procedure for CSFB to GERAN based on PS redirection for mobile-originated calls. the UE is a user that initially accesses the network. CS service access delay. Table 3-2 Comparison of fallback mechanisms for CSFB to GERAN Fallback Mechanism CSFB based on PS redirection CSFB based on PS handover CSFB based on CCO/NACC Flash CSFB Impact on the Networks Simple Complex Medium Medium Impact on the CS Service UEs Access Delay Simple Complex Medium Medium Long Short Medium Short PS Service Interruption Time Long Short Medium Medium CSFB Based on PS Redirection During CSFB based on PS redirection.. After selecting the GERAN. Then. impacts on the networks. and then it sends an RRC Connection Release message to release the UE. 3-9 .2. the eNodeB receives a CS Fallback Indicator. the UE acquires the system information of a GERAN cell. the UE performs initial access to the cell to initiate a CS service. Ltd. as shown in Figure 3-7. The message contains information about a target GERAN carrier frequency group. the following mechanisms are available for an eNodeB to perform CSFB to GERAN: CSFB based on PS redirection CSFB based on PS handover CSFB based on CCO/NACC Flash CSFB Table 3-2 lists the advantages and disadvantages of the preceding mechanisms in terms of impacts on the UEs. reducing the time for the UE to search for a target network. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. the MSC sends a Paging Request message from the CS domain to the MME over the SGs interface. Then. The eNodeB determines whether to perform a blind handover based on the UE capabilities. or both an RAU and an LAU in the target cell. Then. The subsequent steps are the same as the steps in the procedure for CSFB to GERAN based on PS redirection for mobile-originated calls. see chapter 4 "CSFB at the eNodeB. Ltd.. 3. The UE initiates a CS call establishment procedure in the target GERAN cell. 6. a combined RAU/LAU. the MME also delivers the LAI to the eNodeB. The MME sends an S1-AP Request message to instruct the eNodeB to initiate a CSFB procedure. For details. as shown in Figure 3-3. 7.eRAN CS Fallback 3 End-to-End Procedures for CSFB Figure 3-7 CSFB to GERAN based on PS redirection for mobile-originated calls The procedure is described as follows: 1. The message contains information about a target GERAN carrier frequency group. NOTE The eNodeB selects a fallback mechanism and a target cell using the CSFB algorithm." 4. the eNodeB initiates an S1 UE context release procedure. If the MME supports the LAI-related feature. CSFB Procedure for Mobile-terminated Calls In a mobile-terminated call. The UE sends the MME an NAS message Extended Service Request to initiate a CS service. parameters settings. the ongoing PS services of the UE are suspended. For details. the MME or the eNodeB initiates a paging procedure for the UE. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. see section 4." 5. 2. If the UE or GERAN does not support dual transfer mode (DTM). The eNodeB sends an RRC Connection Release message to instruct the UE to perform a redirection. in which CS and PS services run simultaneously. The UE may initiate an LAU. and algorithm policies. 3-10 .1.1 "Choosing Between a Blind Handover and a Measurement-based Handover. CSFB Procedure for Mobile-originated Calls This section describes the procedure for CSFB to GERAN based on PS handover for mobile-originated calls.eRAN CS Fallback 3 End-to-End Procedures for CSFB CSFB Based on PS Handover During CSFB based on PS handover.1 "Choosing Between a Blind Handover and a Measurement-based Handover. the eNodeB instructs the UE to perform a handover. see section 4." 4.1. The MME sends an S1-AP Request message to instruct the eNodeB to initiate a CSFB procedure. as shown in Figure 3-8. Ltd. the ongoing PS services must be suspended before the CS services can be established. parameters settings. If the preparation is successful. the MME also delivers the LAI to the eNodeB. 3-11 .. It then initiates a CS service in the GERAN. The UE sends the MME an NAS message Extended Service Request to initiate a CS service. The eNodeB determines whether to perform a blind handover based on the UE capabilities. For details. 3. and algorithm policies. If the MME supports the LAI-related feature. If the GERAN or some GERAN-supporting UEs do not support DTM. the UE is transferred from the E-UTRAN to the GERAN by performing a PS handover. The eNodeB initiates the preparation phase for a PS handover. 2. Figure 3-8 CSFB to GERAN based on PS handover for mobile-originated calls The procedure is described as follows: 1. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. CSFB Procedure for Mobile-terminated Calls In a mobile-terminated call. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. path switching. as shown in Figure 3-3. Ltd. and then it sends a Mobility From EUTRA Command message to the UE over the Uu interface. CSFB Based on CCO/NACC During CSFB based on CCO/NACC." 5. CSFB Procedure for Mobile-originated Calls This section describes the procedure for CSFB to GERAN based on CCO/NACC for mobile-originated calls. This step is performed together with step 5. Meanwhile. the SGSN updates the bearers towards the S-GW/P-GW. and then it performs initial access to the cell to initiate a CS service. ID. the MME or the eNodeB initiates a paging procedure for the UE. After the handover. as shown in Figure 3-9. The follow-up procedures are performed for the PS handover. the ongoing PS services must be suspended before the CS services can be established. The UE searches for a target cell based on the information it received. the MSC sends a Paging Request message from the CS domain to the MME over the SGs interface.eRAN CS Fallback 3 End-to-End Procedures for CSFB If DTM is not supported by the UE or GERAN. the UE may initiate a CS call establishment procedure with an LAU or combined RAU/LAU procedure in the GERAN. If the GERAN or some GERAN-supporting UEs do not support DTM. and system information of a target GERAN cell.. The subsequent steps are the same as the steps in the procedure for CSFB to GERAN based on PS handover for mobile-originated calls. For details. the eNodeB receives a CS Fallback Indicator from the MME. and RAU. Then. These procedures include data forwarding. 6. 3-12 . NOTE The eNodeB selects a fallback mechanism and a target cell using the CSFB algorithm. the ongoing PS services of the UE are suspended. see chapter 4 "CSFB at the eNodeB. The message contains information about the operating frequency. CSFB Procedure for Mobile-terminated Calls In a mobile-terminated call. see section 4. The eNodeB determines whether to perform a blind handover based on the UE capabilities. as shown Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. For details. Ltd. 6. a combined RAU/LAU. 3-13 . If the MME supports the LAI-related feature. Then. The UE initiates an LAU. parameters settings. NOTE The eNodeB selects a fallback mechanism and a target cell using the CSFB algorithm. see chapter 4 "CSFB at the eNodeB. For details.eRAN CS Fallback 3 End-to-End Procedures for CSFB Figure 3-9 CSFB to GERAN based on CCO/NACC for mobile-originated calls The procedure is described as follows: 1. 3. or both an RAU and an LAU in the target cell. the MSC sends a Paging Request message from the CS domain to the MME over the SGs interface. 7. and algorithm policies. see section 3.1 "Choosing Between a Blind Handover and a Measurement-based Handover. The eNodeB sends a Mobility From EUTRA Command message over the Uu interface to indicate the operating frequency and ID of the target GERAN cell. 8. If the source cell has the system information of the target cell." The system information of the target cell is acquired during the RIM procedure. If DTM is not supported by the UE or GERAN.1. the ongoing PS services of the UE are suspended. The MME initiates an S1 UE context release procedure. The UE initiates a CS call establishment procedure in the target GERAN cell.. the system information is also carried in the message. The UE sends the MME an NAS message Extended Service Request to initiate a CS service.1. the MME also delivers the LAI to the eNodeB. 2." 5. the MME or the eNodeB initiates a paging procedure for the UE.6 "RAN Information Management Procedure. For details." 4. The MME sends an S1-AP Request message to instruct the eNodeB to initiate a CSFB procedure. The message contains information about a target GERAN carrier frequency group. see section 4. The UE searches for a target cell based on the information it received. parameters settings.1.1 "Choosing Between a Blind Handover and a Measurement-based Handover. Flash CSFB During the flash CSFB procedure. The subsequent steps are the same as the steps in the procedure for CSFB to GERAN based on CCO/NACC for mobile-originated calls. 3-14 . 2. For details. The UE sends the MME an NAS message Extended Service Request to initiate a CS service. the ongoing PS services must be suspended before the CS services can be established. and then it performs initial access to the cell to initiate a CS service.eRAN CS Fallback 3 End-to-End Procedures for CSFB in Figure 3-3. and algorithm policies. The message contains information about a target GERAN carrier frequency group. as well as one or Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. If the MME supports the LAI-related feature. the eNodeB receives a CS Fallback Indicator." 4. If the GERAN or some GERAN-supporting UEs do not support DTM. The MME sends an S1-AP Request message to instruct the eNodeB to initiate a CSFB procedure. 3. Ltd. the MME also delivers the LAI to the eNodeB. CSFB Procedure for Mobile-originated Calls This section describes the procedure for flash CSFB to GERAN for mobile-originated calls. as shown in Figure 3-10. The eNodeB sends an RRC Connection Release message to instruct the UE to perform a redirection. and then it sends an RRC Connection Release message to release the UE. The eNodeB determines whether to perform a blind handover based on the UE capabilities. as well as one or more physical cell identities and their associated system information. Figure 3-10 Flash CSFB to GERAN for mobile-originated calls The procedure is described as follows: 1.. see chapter 4 "CSFB at the eNodeB. If PS handover is used for CSFB for emergency calls. The UE may initiate an LAU." 5. the MME instructs the eNodeB to perform CSFB for the UE. the MSC sends a Paging Request message from the CS domain to the MME over the SGs interface. For details. which contains an IE to inform the eNodeB of the service type. The subsequent steps are the same as the steps in the procedure for flash CSFB to GERAN for mobile-originated calls.272. Then. 7. the MSC sends an LCS indicator to the MME over the SGs interface. The UE performs the LCS service after the fallback to the GERAN. The UE initiates a CS call establishment procedure in the target GERAN cell. the MME or the eNodeB initiates a paging procedure for the UE. or both an RAU and an LAU in the target cell. see section 3. 3. For details about the procedure. The UE sends an RRC Connection Request message over the Uu interface or the MME sends an S1-AP message. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. As the SMS service is transparent to the eNodeB. as shown in Figure 3-3. see Emergency Call Feature Parameter Description. the procedure is not described in this document.3 CSFB Procedure for SMS SMS services are unknown to the eNodeB because SMS messages are encapsulated in NAS messages. The GERAN will treat this call as a common CS emergency call. CSFB Procedure for Mobile-terminated Calls In a mobile-terminated call. 6.6 "RAN Information Management Procedure. the eNodeB does not restrict the cells in the handover restriction list when selecting the target cell. 3.4 CSFB Procedure for Emergency Calls The CSFB procedure for an emergency call is the same as the CSFB procedure for a normal mobile-originated voice service. For details. If redirection is used for CSFB for emergency calls. Emergency calls take precedence over other services in the eNodeB. the eNodeB initiates an S1 UE context release procedure. If the GERAN initiates an LCS request towards a UE camping on an E-UTRAN cell. If DTM is not supported by the UE or GERAN. the MME performs an attach or combined TAU/LAU procedure to inform the UE of the LCS capability of the EPS. Then. If the EPS does not support LCS.1. Then.2. The CSFB procedure is the same as the procedure for CSFB to GERAN for mobile-originated calls. 3-15 .5 CSFB Procedure for LCS After a UE initiates an LCS request. 3. For details about admission and preemption of emergency calls. SMS messages are exchanged between the MME and the MSC over the SGs interface. NOTE The eNodeB selects a fallback mechanism and a target cell using the CSFB algorithm.2. the SMS over SGs function can be used in a place covered only by the E-UTRAN. see 3GPP TS 23.2. The CSFB procedure is the same as the procedure for CSFB to GERAN for mobile-terminated calls.. During interworking with the GERAN. Ltd. Because a UE does not require fallback to the GERAN to perform an SMS service. the UE falls back to the GERAN to initiate LCS under the control of the EPS.eRAN CS Fallback 3 End-to-End Procedures for CSFB more physical cell identities and their associated system information. a combined RAU/LAU. the ongoing PS services of the UE are suspended. the Channel Request message that the UE sends when accessing the GERAN contains the indication of an emergency call." The system information of the target cell is acquired during the RIM procedure. 3.3 CSFB to CDMA2000 1xRTT Huawei eNodeBs support CSFB to CDMA2000 1xRTT based on PS redirection. see 3GPP TS 23.2. 3-16 . 3. The Multiple Report mode is enabled or disabled by setting the RimSwitch parameter. see section 3." The Huawei eNodeB supports two information exchange modes. The RIM procedure and parameter settings are described as follows: If a neighboring GERAN cell supports the Multiple Report mode and GERAN_RIM_SWITCH under the RimSwitch parameter is turned on.1.eRAN CS Fallback 3 End-to-End Procedures for CSFB For details about the CSFB procedure for LCS. while the Single Report mode is not configurable. and it acquires the system information of GERAN cells during the RIM procedure. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. However. The preregistration procedure is shown in Figure 3-11.3.272 and LCS Feature Parameter Description. If flash CSFB to GERAN or CCO/NACC is enabled but GERAN_RIM_SWITCH under the RimSwitch parameter is turned off. the UE can initiate the preregistration only if the E-UTRAN supports CSFB to CDMA2000 1xRTT as indicated in the system information block type 8 (SIB8) broadcast by eNodeBs. the eNodeB sends a request for system information to the neighboring GERAN cell. Ltd.1 Preregistration Procedure To perform CSFB to CDMA2000 1xRTT from an E-UTRAN cell.6 RAN Information Management Procedure The RIM procedure for CSFB to GERAN is the same as that for CSFB to UTRAN.6 "RAN Information Management Procedure.. After the neighboring GERAN cell receives the request or the system information changes. For details. this cell sends the system information to the eNodeB. a 1xCS CSFB-capable UE must initiate preregistration with the CDMA2000 1xRTT CS network through the E-UTRAN. the eNodeB obtains the system information of the neighboring GERAN cells by performing the RIM procedure in Single Report mode. 3. the RIM procedure in Multiple Report mode is performed as follows: After an external GERAN cell corresponding to the neighboring GERAN cell is configured. Ltd. 3. 5.401. After receiving the SIB8. The MME sends the 1xCS IWS an S102/A21-1x Air Interface Signaling message containing the IEs IMSI and 1xCS message. see 3GPP TS 23. Based on the received CDMA2000 Reference Cell ID. Meanwhile. The UE sends a 1xRTT CS Registration Request message through the E-UTRAN. The eNodeB transmits the request in a UL S1 cdma2000 Tunnelling message to the MME.2 CSFB Procedure for Mobile-originated Calls This section describes the procedure for CSFB to CDMA2000 1xRTT for mobile-originated calls. The 1xCS IWS performs the preregistration as specified in 3GPP2 A. 4. 3-17 . Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.. the UE decides to initiate preregistration with the CDMA2000 1xRTT CS network. The 1xCS IWS responds to the UE with a 1xRTT CS Registration Response message. as shown in Figure 3-12. For details about the attach procedure. The message is carried in the following messages: − S102 Direct Transfer cdma2000 Tunnelling − DL S1 − DL Information Transfer 3. the UE sends a CSFB Parameters Request CDMA2000 message to the eNodeB to obtain preregistration-related parameters.S0008.3.eRAN CS Fallback 3 End-to-End Procedures for CSFB Figure 3-11 Preregistration procedure for CSFB to CDMA2000 1xRTT The procedure is described as follows: 1. the MME selects a 1xCS IWS (short for Circuit Switched Fallback Interworking Solution Function for 3GPP2 1xCS). The UE is attached to the E-UTRAN. with the IE CDMA2000 Sector ID in the message containing the IE CDMA2000 Reference Cell ID. 2. 1 "Choosing Between a Blind Handover and a Measurement-based Handover. instructing the UE to perform a redirection to the 1xRTT CS domain. parameters settings. The MME sends an S1-AP Request message containing a CS Fallback Indicator. The eNodeB sends the MME an S1 UE Context Release Request message containing the IE Cause with the value of "CS Fallback triggered".S0013. and algorithm policies. the UE performs a cell reselection to return to the E-UTRAN cell. see section 4. When the CS call is complete. For details. 5. 2. Ltd.3 CSFB Procedure for Mobile-terminated Calls This section describes the procedure for CSFB to CDMA2000 1xRTT for mobile-terminated calls. instructing the eNodeB to initiate a CSFB procedure. as specified in 3GPP2 A. 6.eRAN CS Fallback 3 End-to-End Procedures for CSFB Figure 3-12 CSFB to CDMA2000 1xRTT for mobile-originated calls The procedure is described as follows: 1. The eNodeB determines whether to perform a blind handover based on the UE capabilities. The UE sends the MME an NAS message Extended Service Request to initiate a CS service.. 3-18 . 3.1. 3. The UE initiates a CS call establishment procedure to make a call in the 1xRTT CS domain. as shown in Figure 3-13. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. The eNodeB sends an RRC Connection Release message that contains the IE redirectedCarrierInfo.3." 4. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co." 5. Then. If the UE is in idle mode. 3. The MME sends an S1-AP Request message containing a CS Fallback Indicator. 2. The message also contains the calling number. The UE sends the MME an NAS message Extended Service Request to initiate a CS service. The MME sends the paging request in DL S1 cdma2000 Tunnelling and DL Information Transfer messages to the UE. The eNodeB sends an RRC Connection Release message that contains the IE redirectedCarrierInfo. The 1xRTT MSC sends a Paging Request message to the 1xCS IWS. 4.. instructing the UE to perform a redirection to the 1xRTT CS domain. the MME sends a network-initiated service request.1.eRAN CS Fallback 3 End-to-End Procedures for CSFB Figure 3-13 CSFB to CDMA2000 1xRTT for mobile-terminated calls The procedure is described as follows: 1. which enables the UE to transit to active mode.1 "Choosing Between a Blind Handover and a Measurement-based Handover. the 1xCS IWS transmits the paging request to the MME through the S102 tunnel. and algorithm policies. see section 4. 3-19 . Ltd. parameters settings. For details. if any. The eNodeB determines whether to perform a blind handover based on the UE capabilities. instructing the eNodeB to initiate a CSFB procedure. When the CS call is complete. the eNodeB preferentially processes this call. and between the MME and the 1xCS IWS over the S102 interface. the SMS messages are exchanged between the UE and the eNodeB over the Uu interface. The UE sends a 1xRTT Paging Response message from the 1xRTT CS domain. indicating an incoming emergency call. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. The eNodeB sends the MME an S1 UE Context Release Request message containing the IE Cause with the value of "CS Fallback triggered". the MME sends the eNodeB an S1 UE Context Modification Request message containing a CS Fallback Indicator. 3. Upon receiving the information. the UE performs a cell reselection to return to the E-UTRAN cell. between the eNodeB and the MME over the S1 interface. The UE does not require fallback to the CDMA2000 1xRTT network to perform the SMS service. Ltd. 3-20 .S0013. 3. as specified in 3GPP2 A.3.4 CSFB Procedure for SMS During the CSFB procedure. Then. 8. 7.eRAN CS Fallback 3 End-to-End Procedures for CSFB 6.. The UE initiates a CS call establishment procedure to receive a call in the 1xRTT CS domain.5 CSFB Procedure for Emergency Calls If CSFB to CDMA2000 1xRTT is required for an emergency call. indicating that the high-priority emergency call requires CSFB to CDMA2000 1xRTT. the UE sends the MME an NAS message Extended Service Request containing the IE Service Type.3. Decision phase The eNodeB evaluates the measurement results and generates a list of candidate cells. 3. Ltd.eRAN CS Fallback 4 CSFB at the eNodeB 4 CSFB at the eNodeB This chapter describes the CSFB procedure performed by Huawei eNodeB and provides the setting descriptions for the parameters involved. and the UE performs inter-RAT measurements as instructed. 4-1 . Triggering phase After receiving a CS Fallback Indicator from the MME. blind handovers have shorter access delays but a lower handover success rate. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Compared with measurement-based handovers. the eNodeB decides whether to perform CSFB in the form of a blind handover based on the UE capabilities and the setting of the blind handover switch. Measurement phase The eNodeB delivers the inter-RAT measurement configuration to the UE.. 2. 4. Figure 4-1 shows the CSFB procedure performed by the eNodeB. Execution phase The eNodeB executes CSFB to enable the UE to initiate the CS service in the target cell. Figure 4-1 CSFB procedure performed by the eNodeB The CSFB procedure consists of the following phases: 1. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Ltd. it performs blind handovers and measurement-based handovers differently. the eNodeB directly performs CSFB in the form of a blind handover.2 Selecting Frequencies to Measure or a Target Cell (Without an LAI) If the eNodeB has not received any LAIs from the MME. the eNodeB directly performs CSFB in the form of a blind handover. an LCS-supporting RAT takes precedence over a non-LCS-supporting RAT. the MME sends the eNodeB an S1-AP Request message that contains a CS Fallback Indicator. the eNodeB selects a target cell for the blind handover by taking both the following priorities into consideration: the blind-handover priority of the target RAT and the blind-handover priority of the specified cell.1 Triggering Phase of CSFB 4.BlindHoPriority parameter.1. the eNodeB first selects an RAT with the highest blind-handover priority. The target networks to which CSFB can be performed are specified by the HoAlgoSwitch parameter. blind handovers are prohibited. The CS service priorities are specified by the CsPriority parameter. UtranFreqLayerBlindSwitch is a switch under the FreqLayerSwtich parameter. and InterRatLowestPri parameters. the eNodeB checks the blind-handover switch setting and UE capabilities for each RAT and performs accordingly: If the BlindHoSwitch check box under the HoModeSwitch parameter is cleared. If CSFB is triggered for an emergency call. The priorities of RATs used in blind handovers for CSFB are specified through the InterRatHighestPri. The eNodeB selects an RAT with the highest priority first and then selects a cell with the highest priority in this RAT. the eNodeB selects a target cell for the blind handover as follows: If there are UE-supported frequencies with the high CS service priority. if the UE is capable of measuring an RAT. the eNodeB delivers the inter-RAT measurement configuration to the UE. After receiving the CS Fallback Indicator. If the BlindHoSwitch check box under the HoModeSwitch parameter is cleared and the UE is incapable of measuring an RAT. the eNodeB selects the cell with the highest blind-handover priority among the cells on these frequencies. The blind-handover priority of an inter-RAT neighboring cell is specified through the EUTRANINTERFREQNCELL. notifying the eNodeB that the UE should be transferred to the target network. If there are not frequencies with the high CS service priority or the UE does not support frequencies with the high CS service priority. If the BlindHoSwitch check box under the HoModeSwitch parameter is selected. If the selected RAT is UTRAN. InterRatSecondPri. Under this condition. instructing the UE to perform measurements on this RAT.1 Choosing Between a Blind Handover and a Measurement-based Handover After a UE initiates a CS service in an E-UTRAN cell. 4-2 Issue 04 (2012-09-20) . 4. "handover" mentioned in this chapter is a generic term for both normal handover and redirection. the eNodeB selects the cell with the highest blind-handover priority among the cells on the frequencies with the low CS service priority. If LOFD-001078 E-UTRAN to UTRAN CS/PS Steering is enabled and UtranFreqLayerBlindSwitch is turned on. 4.1.. In a Blind Handover If LOFD-001078 E-UTRAN to UTRAN CS/PS Steering is disabled or UtranFreqLayerBlindSwitch is turned off.eRAN CS Fallback NOTE 4 CSFB at the eNodeB To simplify statements. 3. If there are multiple neighboring cells in the highest-priority non-empty set. The eNodeB selects the CSFB target cell from the set that has the highest priority among all non-empty sets.3 Selecting Frequencies to Measure or a Target Cell (With an LAI) If the MME delivers an LAI to the eNodeB. This section describes the LAI-based principles. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. If the neighboring GERAN and UTRAN cells have the same PLMN ID as that indicated in the received LAI. Choosing neighboring cells with high CS service priorities among the cells listed in 1. 4. the eNodeB selects the RAT with the higher blind-handover priority as the target RAT for CSFB. If UTRAN is selected. the eNodeB delivers the inter-RAT measurement configuration to the UE. the eNodeB selects the neighboring cell with the highest blind handover priority as the CSFB target cell. measurements vary as follows: If there are UE-supported frequencies with the high CS service priority. in addition to the principles described in the preceding section. This CSFB will be performed in the form of a measurement-based handover. and UtranFreqLayerMeasSwitch is turned on. then measurements will be performed on frequencies with the low CS service priority. but not on frequencies with the low CS service priority even after measurements fail for the frequencies with the high CS service priority. the UE does not support the frequencies with the high CS service priority. Ltd. 4-3 . 2.. If the three sets are all empty. the eNodeB selects the target cell by performing the following steps: 1. UtranFreqLayerMeasSwitch is a switch under the FreqLayerSwtich parameter. or no cell in the neighboring UTRAN cell list operates on the frequencies with the high CS service priority. measurements will be performed on frequencies with the high CS service priority. and therefore the eNodeB decides whether to instruct the UE to perform measurements only based on whether the UE supports the GERAN and GERAN frequencies. Set 3 consists of neighboring cells located in the same PLMN as the serving PLMN of the UE. Listing neighboring cells with the same PLMN ID as that indicated in the received LAI.1. Preferentially selecting neighboring cells with the same LAC as that indicated in the received LAI. In a Blind Handover The eNodeB checks all inter-RAT neighboring cells of the cell serving the UE and considers the following three sets (in descending order of priority) based on the LAI: Set 1 consists of neighboring cells with the same PLMN ID and LAC as those indicated in the received LAI. If LOFD-001078 E-UTRAN to UTRAN CS/PS Steering is enabled and UtranFreqLayerMeasSwitch is turned on. LOFD-001078 E-UTRAN to UTRAN CS/PS Steering is enabled. NOTE UtranFreqLayerMeasSwitch controls only UTRAN frequencies but not GERAN frequencies. and then includes the information in the measurement configuration to the UE.eRAN CS Fallback 4 CSFB at the eNodeB In a Measurement-based Handover If LOFD-001078 E-UTRAN to UTRAN CS/PS Steering is disabled or UtranFreqLayerMeasSwitch is turned off. If there are not frequencies with the high CS service priority. Set 2 consists of neighboring cells with the same PLMN ID but different LACs as those indicated in the received LAI. the eNodeB selects a UE-supported RAT and frequency in the configurations of neighboring frequencies and neighboring cells. the eNodeB also takes this LAI into account. 331 defines the entering and leaving conditions of event B1 as follows: Entering condition: Mn + Ofn .Hys > Thresh Leaving condition: Mn + Ofn + Hys < Thresh where Mn is the measurement result of the neighboring cell. It is contained in the associated measurement object IE in the measurement configuration. Ofn is the frequency-specific offset for the frequency of the neighboring cell." 4. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. The values of Thresh are set based on the measurement quantities for each RAT. Ec/No threshold for CSFB to UTRAN is specified by CsfbHoUtranB1ThdEcn0. see Mobility Management in Connected Mode Feature Parameter Description. The UE supports this RAT. For details.2..2 Measurement Phase of CSFB 4. 3GPP TS 36. NOTE If the eNodeB fails to select the frequencies and target cells according to the LAI delivered by the MME.eRAN CS Fallback 4 CSFB at the eNodeB If there are multiple cells after the preceding steps. as follows: − The − The − The received signal code power (RSCP) threshold for CSFB to UTRAN is specified by CsfbHoUtranB1ThdRscp. 4.2.2 "Selecting Frequencies to Measure or a Target Cell (Without an LAI). Note that only the frequencies that the UE is capable of measuring are delivered in the measurement configuration. and CDMA2000 1xRTT are contained in the measurement configuration. Thresh is the threshold for event B1. Ltd. the eNodeB proceeds with the procedure as described in the case of a blind handover.1. Hys is the hysteresis for event B1. The UE is capable of measuring this frequency. GERAN. received signal strength indicator (RSSI) threshold for CSFB to GERAN is specified by CsfbHoGeranB1Thd. which is reported in event-triggered periodical reporting mode. 4-4 .2 Measurement Reporting CSFB is triggered by event B1. the eNodeB proceeds with the procedure as described in section 4. The triggering of event B1 indicates that the signal quality is higher than a specified threshold in at least one neighboring cell. The hysteresis values for CSFB to UTRAN.1 Measurement Configuration The measurement configuration procedure and measurement gap configuration for CSFB to UTRAN/GERAN/CDMA2000 1xRTT are the same as those for inter-RAT handovers. In a Measurement-based Handover The eNodeB delivers information about an inter-RAT frequency in the measurement configuration to the UE if both the following conditions are met: The PLMN ID of any inter-RAT neighboring cell on this frequency is the same as the PLMN indicated in the LAI. It sorts cells in each list by signal quality. For example.1. If the entering condition of event B1 is continuously met during a period known as time-to-trigger. These mechanisms are laid out in descending order of priority. respectively. This process stops when the eNodeB selects a mechanism that the UE supports. The time-to-trigger for event B1 related to CS fallback to UTRAN/GERAN/CDMA2000 1xRTT is specified by the CsfbHoUtranTimeToTrig. 4. see section 4. if so. the eNodeB checks whether the UE supports the mechanism with the second-highest priority. if the switch controlling PS handover from E-UTRAN to UTRAN is turned on but the UE does not support PS handover. Table 4-1 CSFB mechanisms Target Network UTRAN Mechanisms (in Descending Order of Priority) PS handover Flash CSFB Redirection Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. The applicable mechanisms are specified by the HoModeSwitch parameter. CsfbHoGeranTimeToTrig.. and it selects a target cell from the three lists in descending order of priority. the way in which the eNodeB determines the target cell for the CSFB varies depending on whether an LAI has been received.eRAN CS Fallback − The 4 CSFB at the eNodeB pilot strength threshold for CSFB to CDMA2000 1xRTT is specified by CsfbHoCdmaB1ThdPS. After having received the B1 measurement reports for CSFB. and 3. Ltd.4 Execution Phase of CSFB Table 4-1 lists the mechanisms that are available for CSFB to UTRAN. and CsfbHoCdmaTimeToTrig parameters. If an LAI has been received. and CDMA2000 1xRTT. 4-5 . The following parameters related to event B1 for CSFB are the same as those related to event B1 for inter-RAT handovers: Frequency-specific offset for the frequency of the neighboring cell Hysteresis Reporting interval Maximum number of cells contained in one report Number of periodic reports For details." 4. the eNodeB determines whether CSFB is to be initiated and. the eNodeB considers the candidate cells in sets 1. It selects the cell with the highest signal quality from this list. Based on the result. and 3. determines the target cell for the CSFB. GERAN. the eNodeB generates a list of candidate cells for CSFB based on the received reports. the UE reports information about the cells that meet the condition to the eNodeB. see Mobility Management in Connected Mode Feature Parameter Description. as follows: If no LAI has been received. The eNodeB selects a mechanism based on both the UE capability and mechanism priority. 2. the eNodeB checks the measurement results reported by the UE. 2.3 "Selecting Frequencies to Measure or a Target Cell (With an LAI).3 Decision Phase of CSFB In the decision phase of a measurement-based handover for CSFB. For details about sets 1. the eNodeB performs a blind redirection procedure for CSFB. Ltd.. If the UE remains in the coverage of the eNodeB when the timer expires.eRAN CS Fallback 4 CSFB at the eNodeB Target Network GERAN Mechanisms (in Descending Order of Priority) PS handover CCO/NACC Flash CSFB Redirection CDMA2000 1xRTT Redirection 4. 4-6 . Currently the timer is fixedly set to 4 seconds. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.5 CSFB Exception Handling The eNodeB starts a timer after receiving the CS Fallback Indicator. That is. LOFD-001069 CS Fallback with LAI to GERAN depends on LOFD-001034 CS Fallback to GERAN. a typical CSFB procedure also includes the measurement phase. LOFD-001053 Flash CS Fallback to GERAN will be disabled. decision phase.. The interactions between NEs in the three phases are the same for the two types of procedure. and UEs support mobility from the E-UTRAN to the UTRAN.2 Mutually Exclusive Features None 5. and the UE supports mobility from the E-UTRAN to the GERAN.1 Required Features As with an inter-RAT handover procedure. 5. LOFD-001068 CS Fallback with LAI to UTRAN depends on LOFD-001033 CS Fallback to UTRAN. all inter-RAT procedures to the GERAN including CSFB will preferentially be based on handovers if the handover to the GERAN is enabled and the UE is capable of such handover. Therefore. The dependencies are described as follows: LOFD-001033 CS Fallback to UTRAN depends on LOFD-001019 PS Inter-RAT Mobility between E-UTRAN and UTRAN. 5-1 . If the handover switch is turned on in LOFD-001020 PS Inter-RAT Mobility between E-UTRAN and GERAN. Ltd. LOFD-001034 CS Fallback to GERAN depends on LOFD-001020 PS Inter-RAT Mobility between E-UTRAN and GERAN. LOFD-001052 Flash CS Fallback to UTRAN depends on LOFD-001033 CS Fallback to UTRAN.3 Affected Features If the handover switch is turned on in LOFD-001019 PS Inter-RAT Mobility between E-UTRAN and UTRAN. and execution phase. the enhanced ones depend on the fundamental ones. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.eRAN CS Fallback 5 Related Features 5 Related Features 5. the features related to CSFB depend on those related to inter-RAT handovers. LOFD-001035 CS Fallback to CDMA2000 1xRTT depends on LOFD-001021 PS Inter-RAT Mobility between E-UTRAN and CDMA2000. all inter-RAT procedures to the UTRAN including CSFB will preferentially be performed based on handovers if handovers to the UTRAN is enabled and UEs are capable of such handovers. among the features related to CSFB. In addition. That is. LOFD-001053 Flash CS Fallback to GERAN depends on LOFD-001034 CS Fallback to GERAN. LOFD-001052 Flash CS Fallback to UTRAN will be disabled. Therefore. Considering that the number of UEs requesting CS services within an area is relatively stable and has no correlation with the deployment of the EPS. Therefore. CCO/NACC. Ltd. If PS handover is used as the CSFB mechanism. the number of UEs initiating CS services per second per cell during peak hours is far below the cell capacity. it does not require extra signaling. each CSFB is equivalent to the initiation of a new CS service.eRAN CS Fallback 6 Impact on the Networks 6 Impact on the Networks 6. 6-1 . extra signaling is required only during eNodeB deployment. The cause of this drop is that handover-triggered CS service access has a higher requirement for signal quality compared with normal CS service access. and execution of each handover.1 Impact on System Capacity In essence. no extra signaling message is required from the target network or from the EPS. or flash CSFB is used as the CSFB mechanism. However. the signaling overhead is negligibly low. preparation. For the EPS. For the target network. 6. It is a little lower than the access success rate for normal CS UEs. a redirection or CCO-without-NACC procedure is equivalent to the initiation of a new CS service. the signaling overhead caused by PS handovers is low.. the access success rate for CSFB UEs is theoretically the same as that for normal CS UEs. the access success rate for CSFB UEs depends on the success rate of handovers to the corresponding RAT. CSFB mechanisms affect signaling overheads as follows: If redirection or CCO without NACC is used as the CSFB mechanism. CSFB has no impact on the total number of UEs requesting CS services within a network. the signaling overhead is negligibly low because of infrequent system information updates. CSFB provides CS service access for E-UTRAN UEs. Therefore. it does not need to interact with the target network. If PS handover is used as the CSFB mechanism. If flash CSFB or CCO with NACC is used as the CSFB mechanism. From that time onwards. extra signaling is required from each NE in the request. Therefore.2 Impact on Network Performance CSFB affects the access success rate as follows: If redirection. from the perspective of traffic statistics. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. or UEs in the LTE network do not support VoIP services. see Mobility Management in Connected Mode Feature Parameter Description. 7. see Mobility Management in Connected Mode Feature Parameter Description.2 CSFB to GERAN Use LOFD-001034 CS Fallback to GERAN in the initial phase of LTE network deployment when both of the following conditions are met: The operator owns a mature GERAN network. use CSFB based on blind handover to decrease the CSFB delay. The LTE network does not provide VoIP services. If the UTRAN cell and E-UTRAN cell cover the same area. For policies on whether to use PS handover or PS redirection for CSFB. If the CDMA2000 1xRTT cell and E-UTRAN cell cover the same area.1.1 When to Use CSFB 7. For policies on whether to use PS handover or PS redirection for CSFB.. or UEs in the LTE network do not support VoIP services. For policies on whether to use PS handover or PS redirection for CSFB. 7-1 . If the GERAN cell and E-UTRAN cell cover the same area. The LTE network does not provide VoIP services.1. use CSFB based on blind handover to decrease the CSFB delay. use CSFB based on blind handover to decrease the CSFB delay.1. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. The LTE network does not provide VoIP services.1.3 CSFB to CDMA2000 1xRTT Use LOFD-001035 CS Fallback to CDMA2000 1xRTT in the initial phase of LTE network deployment when both of the following conditions are met: The operator owns a mature CDMA2000 1xRTT network.4 Flash CSFB to UTRAN When LOFD-001033 CS Fallback to UTRAN has been enabled. 7. or the CDMA2000 1xRTT cell provides better coverage than the E-UTRAN cell. or UEs in the LTE network do not support VoIP services. use LOFD-001052 Flash CS Fallback to UTRAN if all the following conditions are met: The E-UTRAN and UTRAN support the RIM with SIB procedure. UEs comply with 3GPP Release 9. see Mobility Management in Connected Mode Feature Parameter Description.eRAN CS Fallback 7 Engineering Guidelines 7 Engineering Guidelines 7. or the GERAN cell provides better coverage than the E-UTRAN cell. 7. The core networks support the RIM procedure.1 CSFB to UTRAN Use LOFD-001033 CS Fallback to UTRAN in the initial phase of LTE network deployment when both of the following conditions are met: The operator owns a mature UTRAN network. Ltd. or the UTRAN cell provides better coverage than the E-UTRAN cell. 1.7 CSFB with LAI to GERAN Use LOFD-001069 CS Fallback with LAI to GERAN when both of the following conditions are met: LOFD-001034 CS Fallback to GERAN has been enabled. Use LOFD-001068 CS Fallback with LAI to UTRAN also when both of the following conditions are met: LOFD-001033 CS Fallback to UTRAN and LOFD-001034 CS Fallback to GERAN have been enabled. or the E-UTRAN cell has neighboring UTRAN cells that have different location area codes (LACs).1 CSFB to UTRAN Collect the operating frequencies. 7. Ltd.eRAN CS Fallback 7 Engineering Guidelines For policies on whether to use PS handover or PS redirection for CSFB.1. or the E-UTRAN cell has neighboring GERAN cells that have different LACs. see Mobility Management in Connected Mode Feature Parameter Description. 7-2 .5 Flash CSFB to GERAN When LOFD-001034 CS Fallback to GERAN has been enabled. UEs comply with 3GPP Release 9. Use LOFD-001069 CS Fallback with LAI to GERAN also when both of the following conditions are met: LOFD-001033 CS Fallback to UTRAN and LOFD-001034 CS Fallback to GERAN have been enabled. If the UTRAN cell and E-UTRAN cell cover the same area. The E-UTRAN cell has neighboring GERAN cells that belong to different PLMNs and supports inter-PLMN handovers.2. 7. If the GERAN cell and E-UTRAN cell cover the same area.6 CSFB with LAI to UTRAN Use LOFD-001068 CS Fallback with LAI to UTRAN when both of the following conditions are met: LOFD-001033 CS Fallback to UTRAN has been enabled. The E-UTRAN cell has neighboring UTRAN cells that belong to different PLMNs and supports inter-PLMN handovers. Table 7-1 describes the requirements of CSFB to UTRAN for the core networks. use CSFB based on blind handover to decrease the CSFB delay. and core networks. and ensure that they all support CSFB. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. 7. Collect the versions and configurations of the NEs in the E-UTRAN. The neighboring UTRAN and GERAN cells of the E-UTRAN cell have different LAIs.1. use LOFD-001053 Flash CS Fallback to GERAN if all the following conditions are met: The E-UTRAN and GERAN support the RIM with SIB procedure. For policies on whether to use PS handover or PS redirection for CSFB. 7. use CSFB based on blind handover to decrease the CSFB delay. or the GERAN cell provides better coverage than the E-UTRAN cell.. The core networks support the RIM procedure.2 Information to Be Collected 7. see Mobility Management in Connected Mode Feature Parameter Description. coverage areas. UTRAN. The neighboring UTRAN and GERAN cells of the E-UTRAN cell have different LAIs. and configurations of the E-UTRAN and UTRAN cells. or the UTRAN cell provides better coverage than the E-UTRAN cell. 7. 7-3 . Collect the versions and configurations of the NEs in the E-UTRAN. For details. Table 7-2 describes the requirements of CSFB to GERAN for the core networks.2.2 CSFB to GERAN Collect the operating frequencies. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. and configurations of the E-UTRAN and GERAN cells.eRAN CS Fallback 7 Engineering Guidelines Table 7-1 Requirements of CSFB to UTRAN for the core networks NE MME Description Supports: SGs interface to the MSC LAI selection based on the TAI of the serving cell MSC-initiated paging PLMN selection and reselection Combined EPS/IMSI attach. Collect the following information about the UEs supporting UMTS and LTE on the live network: − Supported − Whether − Whether − Whether frequency bands the UEs support redirection from E-UTRAN to UTRAN the UEs support PS handover from E-UTRAN to UTRAN the UEs support UTRAN measurements This information is used to configure neighboring UTRAN cells and to determine whether to perform CSFB based on handover or redirection. see Mobility Management in Connected Mode Feature Parameter Description. and ensure that they all support CSFB. and combined TAU/LAU Routing of CS signaling messages SMS over SGs MSC Supports: Combined EPS/IMSI attach SMS over SGs Paging message forwarding over the SGs interface SGSN Does not activate ISR during the combined RAU/LAU procedure initiated by the UE. coverage areas. and core networks. combined EPS/IMSI detach. GERAN. Ltd.. and configurations of the E-UTRAN and CDMA2000 1xRTT cells. and ensure that they all support CSFB.eRAN CS Fallback 7 Engineering Guidelines Table 7-2 Requirements of CSFB to GERAN for the core networks NE MME Description Supports: SGs interface to the MSC LAI selection based on the TAI of the serving cell MSC-initiated paging PLMN selection and reselection Combined EPS/IMSI attach. CDMA2000 1xRTT. and tunnel reestablishment Redirection of inter-MME S102 tunnels in the case of MME relocation Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. data buffering.2.3 CSFB to CDMA2000 1xRTT Collect the operating frequencies. combined EPS/IMSI detach. Collect the following information about the UEs supporting GSM and LTE on the live network: − Supported − Whether − Whether − Whether frequency bands the UEs support redirection from E-UTRAN to GERAN the UEs support PS handover from E-UTRAN to GERAN the UEs support GERAN measurements This information is used to configure neighboring GERAN cells and to determine whether to perform CSFB based on handover or redirection. Ltd.. see Mobility Management in Connected Mode Feature Parameter Description. For details. and core networks. 7-4 . Table 7-3 Requirements of CSFB to CDMA2000 1xRTT for the core networks NE MME Description Supports: 1xCS signaling transfer over the S102 interface. and combined TAU/LAU Routing of CS signaling messages SMS over SGs MSC Supports: Combined EPS/IMSI attach SMS over SGs Paging message forwarding over the SGs interface SGSN Does not activate ISR during the combined RAU/LAU procedure initiated by the UE. Collect the versions and configurations of the NEs in the E-UTRAN. Table 7-3 describes the requirements of CSFB to CDMA2000 1xRTT for the core networks. 7. coverage areas. coverage areas. and configurations of the E-UTRAN and UTRAN cells.2. Collect the versions and configurations of the NEs in the E-UTRAN. 7-5 . Ltd. combined EPS/IMSI detach.4 Flash CSFB to UTRAN Collect the operating frequencies. For details. Table 7-4 Requirements of flash CSFB to UTRAN for the core networks NE MME Description Supports: SGs interface to the MSC LAI selection based on the TAI of the serving cell MSC-initiated paging PLMN selection and reselection Combined EPS/IMSI attach. 7. UTRAN. and combined TAU/LAU Routing of CS signaling messages SMS over SGs RIM procedures MSC Supports: Combined EPS/IMSI attach SMS over SGs Paging message forwarding over the SGs interface Does not activate ISR during the combined RAU/LAU procedure initiated by the UE. and ensure that they all support CSFB and the RIM procedure.. SGSN Collect the following information about the UEs supporting UMTS and LTE on the live network: − Supported − Whether − Whether − Whether − Whether frequency bands the UEs support redirection from E-UTRAN to UTRAN the UEs support PS handover from E-UTRAN to UTRAN the UEs support UTRAN measurements the UEs comply with 3GPP Release 9 specifications Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.eRAN CS Fallback 7 Engineering Guidelines Collect the following information about the UEs supporting CDMA2000 and LTE on the live network: − Supported − Whether − Whether − Whether frequency bands the UEs support redirection from E-UTRAN to CDMA2000 the UEs support PS handover from E-UTRAN to CDMA2000 the UEs support CDMA2000 measurements This information is used to configure neighboring CDMA2000 cells and to determine whether to perform CSFB based on handover or redirection. Table 7-4 describes the requirements of flash CSFB to UTRAN for the core networks. see Mobility Management in Connected Mode Feature Parameter Description. and core networks. Supports RIM procedures. 2. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. see Mobility Management in Connected Mode Feature Parameter Description. GERAN.eRAN CS Fallback 7 Engineering Guidelines This information is used to configure neighboring UTRAN cells and to determine whether to perform CSFB based on handover or redirection. coverage areas. coverage areas. Collect the versions and configurations of the NEs in the E-UTRAN. Supports RIM procedures. Ltd. Table 7-5 Requirements of flash CSFB to GERAN for the core networks NE MME Description Supports: SGs interface to the MSC LAI selection based on the TAI of the serving cell MSC-initiated paging PLMN selection and reselection Combined EPS/IMSI attach. and core networks. For details.2. For details.6 CSFB with LAI to UTRAN Collect the operating frequencies. and configurations of the E-UTRAN and GERAN cells. 7. combined EPS/IMSI detach. and configurations of the E-UTRAN and UTRAN cells. Table 7-5 describes the requirements of flash CSFB to GERAN for the core networks. and ensure that they all support CSFB and the RIM procedure. and combined TAU/LAU Routing of CS signaling messages SMS over SGs RIM procedures MSC Supports: Combined EPS/IMSI attach SMS over SGs Paging message forwarding over the SGs interface Does not activate ISR during the combined RAU/LAU procedure initiated by the UE. 7-6 . 7. see Mobility Management in Connected Mode Feature Parameter Description.. SGSN Collect the following information about the UEs supporting GSM and LTE on the live network: − Supported − Whether − Whether − Whether − Whether frequency bands the UEs support redirection from E-UTRAN to GERAN the UEs support PS handover from E-UTRAN to GERAN the UEs support GERAN measurements the UEs comply with 3GPP Release 9 specifications This information is used to configure neighboring GERAN cells and to determine whether to perform CSFB based on handover or redirection.5 Flash CSFB to GERAN Collect the operating frequencies. Collect the versions and configurations of the NEs in the E-UTRAN. combined EPS/IMSI detach. Collect the following information about the UEs supporting UMTS and LTE on the live network: − Supported − Whether − Whether − Whether frequency bands the UEs support redirection from E-UTRAN to UTRAN the UEs support PS handover from E-UTRAN to UTRAN the UEs support UTRAN measurements This information is used to configure neighboring UTRAN cells and to determine whether to perform CSFB based on handover or redirection. coverage areas. UTRAN. and combined TAU/LAU Routing of CS signaling messages SMS over SGs LAI delivery MSC Supports: Combined EPS/IMSI attach SMS over SGs Paging message forwarding over the SGs interface SGSN Does not activate ISR during the combined RAU/LAU procedure initiated by the UE.7 CSFB with LAI to GERAN Collect the operating frequencies. 7-7 .2. and ensure that they all support CSFB and the MME supports LAI delivery. 7. Table 7-6 describes the requirements of CSFB with LAI to UTRAN for the core networks. GERAN. and configurations of the E-UTRAN and GERAN cells. and core networks.eRAN CS Fallback 7 Engineering Guidelines Collect the versions and configurations of the NEs in the E-UTRAN. and ensure that they all support CSFB and the MME supports LAI delivery. Table 7-6 Requirements of CSFB with LAI to UTRAN for the core networks NE MME Description Supports: SGs interface to the MSC LAI selection based on the TAI of the serving cell MSC-initiated paging PLMN selection and reselection Combined EPS/IMSI attach.. and core networks. For details. Table 7-7 describes the requirements of CSFB with LAI to GERAN for the core networks. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Ltd. see Mobility Management in Connected Mode Feature Parameter Description. 7. If the core-network equipment is provided by Huawei. Collect the following information about the UEs supporting GSM and LTE on the live network: − Supported − Whether − Whether − Whether frequency bands the UEs support redirection from E-UTRAN to GERAN the UEs support PS handover from E-UTRAN to GERAN the UEs support GERAN measurements This information is used to configure neighboring GERAN cells and to determine whether to perform CSFB based on handover or redirection. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.. the eNodeB must collaborate with core-network equipment. 7-8 . check with the vendor whether the equipment supports this feature.2 or later. and combined TAU/LAU Routing of CS signaling messages SMS over SGs LAI delivery MSC Supports: Combined EPS/IMSI attach SMS over SGs Paging message forwarding over the SGs interface SGSN Does not activate ISR during the combined RAU/LAU procedure initiated by the UE. For details. If the core-network equipment is provided by another vendor.1 Deployment Requirements Requirements for the Operating Environment For this feature.eRAN CS Fallback 7 Engineering Guidelines Table 7-7 Requirements of CSFB with LAI to GERAN for the core networks NE MME Description Supports: SGs interface to the MSC LAI selection based on the TAI of the serving cell MSC-initiated paging PLMN selection and reselection Combined EPS/IMSI attach.3. see Mobility Management in Connected Mode Feature Parameter Description. Ltd. Requirements for Licenses Operators must purchase and activate the following license. the version must be SAE1.3 Deploying CSFB to UTRAN 7. combined EPS/IMSI detach. 2 Data Preparation This section describes generic data and scenario-specific data to be collected.3. This MO is required only if the NodeB providing the external UTRAN cell works in RAN sharing with common carriers mode and multiple operators share the external UTRAN cell. the UtranExternalCell. This section provides only the information about managed objects (MOs) related to neighboring UTRAN cells. Network plan (negotiation not required): Parameters are planned and set by operators. For more information about how to collect data for the parameters in these MOs. There are three types of data sources: Network plan (negotiation required): Parameters are planned by operators and negotiated with the EPC or peer transmission equipment.Rac parameter must be set. UtranExternalCellPlmn: used to configure additional PLMN IDs for each shared external UTRAN cell. Generic data is necessary for all scenarios and must always be collected. Scenario-specific data is collected only when necessary for a specific scenario.eRAN CS Fallback 7 Engineering Guidelines Table 7-8 License control item for CSFB to UTRAN Feature LOFD-001033 CS Fallback to UTRAN License Control Item Name CS Fall Back to UTRAN License Control Item ID LLT1CFBU01 7. the blind-handover priority of the cell must be specified by the UtranNCell. see Mobility Management in Connected Mode Feature Parameter Description. If PS handover is used.BlindHoPriority parameter. Generic Data Before configuring CSFB to UTRAN. Scenario-specific Data The following table describes the parameters that must be set in the ENodeBAlgoSwitch MO to set the handover mode and handover algorithm switches for CSFB to UTRAN. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. collect the data related to neighbor relationships with UTRAN cells. Ltd.. If a neighboring UTRAN cell supports blind handovers according to the network plan. Collect data for the parameters in the following MOs: UtranNFreq: used to configure neighboring UTRAN frequencies. UtranNCell: used to configure neighbor relationships with UTRAN cells. User-defined: Parameters are set as required by users. UtranExternalCell: used to configure external UTRAN cells. 7-9 . select the BlindHoSwitch(BlindHoSwitch) check box. This (negotiation parameter is set to CDMA2000 by default and not required) specifies the low-priority RAT to be considered in blind handovers for CSFB. Network plan Set this parameter based on the network plan. Ltd. Network plan Set this parameter based on the network plan. 7-10 . This (negotiation parameter is set to GERAN by default and specifies not required) the medium-priority RAT to be considered in blind handovers for CSFB. retain the default value. Network plan Set this parameter based on the network plan. select the required) UtranPsHoSwitch(UtranPsHoSwitch) check box. Ensure that this parameter is set to a different value from the InterRatHighestPri and InterRatLowestPri parameters. To activate blind handovers. InterRatHighestPri Network plan Set this parameter based on the network plan. Parameter Parameter ID Name CN Operator ID Highest priority InterRat Source Setting Description CSFallBackBlindHoCfg. If this check box is not selected. Ensure that this parameter is set to a different value from the InterRatHighestPri and InterRatSecondPri parameters.eRAN CS Fallback 7 Engineering Guidelines Parameter Name Parameter ID Source Setting Description Handover HoModeSwitch Network plan Set this parameter based on the network plan. This (negotiation parameter is set to UTRAN by default and specifies not required) the high-priority RAT to be considered in blind handovers for CSFB. Handover Algo switch HoAlgoSwitch Network plan To activate CSFB to UTRAN. Mode switch (negotiation not To activate PS handovers.. required) The following table describes the parameters that must be set in the CSFallBackBlindHoCfg MO to set the blind-handover priorities of different RATs for CSFB. A blind handover to an inter-RAT cell can be performed only if a blind-handover priority is specified for the inter-RAT cell. redirection will be used for CSFB to UTRAN. blind handovers reduce access delays but cause lower handover success rates. Compared with measurement-based handovers. Second priority InterRat InterRatSecondPri Lowest priority InterRat InterRatLowestPri Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. This CnOperatorId (negotiation parameter specifies the ID of the operator whose not required) RAT blind-handover priorities are to be set. select the (negotiation not UtranCsfbSwitch(UtranCsfbSwitch) check box. For CSFB to UTRAN. This method applies to users who are unfamiliar with the navigation tree. This (negotiation parameter specifies the LCS capability of the not required) UTRAN. Configuring eNodeBs in Batches To configure eNodeBs in batches.4 Initial Configuration Configuring a Single eNodeB Using the GUI Configure a single eNodeB in the general configuration window on the Configuration Management Express (CME) based on the MOs and parameters as described in section 7. The parameter settings in the user-defined template will be applied to the eNodeBs after you import the summary data file into the CME. 7. Navigate to Introduction to the LTE General Configuration Window and refer to the generic procedure for setting parameters using the CME graphical user interface (GUI).3 Precautions None 7.3.3. search an MO.2 "Data Preparation. and save the parameter settings as a user-defined template. perform the following steps: Step 1 On the GUI.eRAN CS Fallback 7 Engineering Guidelines Parameter Parameter ID Name UTRAN UtranLcsCap LCS capability Source Setting Description Network plan Set this parameter based on the network plan.. In the Search pane. set the parameters listed in Table 7-9. 7-11 . Press F1 to launch M2000 Help. To find MOs in the planned area." Step 2 Fill in the summary data file with the name of the user-defined template. Ltd. find MOs in the navigation tree.3. Downlink UARFCN Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.3." See the M2000 Help for more information about operations in the general configuration window. use either of the following methods: In the Object Group pane. see eNodeB Initial Configuration Guide. This method applies to users who are familiar with the navigation tree.2 "Data Preparation. The parameters are the same as those described in section 7. ----End For descriptions of the user-defined template and summary data file and also the detailed procedure for configuring eNodeBs in batches. Table 7-9 Parameters for CSFB to UTRAN MO UTRANNFREQ Parameter Group Name UtranNFreq Parameter Local cell identity. UTRAN cell identity. Mobile network code. Mobile country code. 7-12 . Share mobile country code. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Mobile country code. CSFB to UTRAN takes effect. Location area code UTRANEXTERNA UtranExternalCell LCELL UTRANEXTERNA UtranExternalCellPlmn UTRAN cell identity. Figure 7-1 and Figure 7-2 show sample procedures for CSFB to UTRAN for a mobile-originated call and CSFB to UTRAN for a mobile-terminated call. ADD UTRANEXTERNALCELL 3.eRAN CS Fallback 7 Engineering Guidelines MO Parameter Group Name Parameter Mobile country code. Highest priority InterRat. UTRAN LCS capability Configuring a Single eNodeB Using MML Commands The configuration procedure is as follows: Step 1 Run the following commands to add neighbor relationships with UTRAN cells: 1. Downlink UARFCN.. Step 2 Run the MOD ENODEBALGOSWITCH command to set the handover mode and handover algorithm switches for CSFB to UTRAN. Second priority NDHOCFG InterRat. the UE was in idle mode before the call and is forced to fall back to the UTRAN using a redirection.5 Activation Observation The activation observation procedure is as follows: Step 1 Enable a UE to camp on an E-UTRAN cell and originate a voice call. In the examples. Handover Mode switch ENODEBALGOS ENodeBAlgoSwitch WITCH CSFALLBACKBLI CSFallBackBlindHoCfg CN Operator ID. Step 2 Enable the UE to camp on the E-UTRAN cell and receive a voice call. ADD UTRANEXTERNALCELLPLMN 4. You can observe the signaling procedures for CSFB to UTRAN. Mobile network code. ADD UTRANNFREQ 2. Mobile network LCELLPLMN code. Primary scrambling code. see Mobility Management in Connected Mode Feature Parameter Description.3. Blind handover priority Handover Algo switch. ADD UTRANNCELL For details about parameter settings. Step 3 Run the MOD CSFALLBACKBLINDHOCFG command to set the blind-handover priorities of different RATs for CSFB. ----End 7. RNC identity. Ltd. If the calls continue until they are ended. Share mobile network code UTRANNCELL UtranNCell Local cell identity. Lowest priority InterRat. respectively. UTRAN cell identity. This applies to all figures in the rest of this document. 7-13 . Figure 7-1 CSFB to UTRAN for a mobile-originated call Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.eRAN CS Fallback NOTE 7 Engineering Guidelines The same UE is shown in the left and right sides of the figure.. The messages on the UMTS side are only for reference. Ltd. the eNodeB delivers the B1-related measurement configuration. The procedures indicated by dashed lines are optional. the eNodeB does not deliver the B1-related measurement configuration but sends an RRC Connection Release (RRC Conn Rel in the figures) message to the UE. During the redirection. Ltd. If blind redirection is used for CSFB to UTRAN. the eNodeB initiates a UE capability enquiry procedure if the UE capability is not included in the Initial Context Setup Request (Initial Context Setup Req in the figures) message received from the MME. Figure 7-3 shows the PS handover procedure.eRAN CS Fallback 7 Engineering Guidelines Figure 7-2 CSFB to UTRAN for a mobile-terminated call If measurement-based redirection is used for CSFB to UTRAN.. If the UE capability is included. the eNodeB does not initiate this procedure. If PS handover is used for CSFB to UTRAN. instead of sending an RRC Connection Release message to the UE. 7-14 . Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. the eNodeB initiates a PS handover procedure after receiving a measurement report from the UE. the eNodeB must collaborate with core-network equipment.1 Deployment Requirements Requirements for the Operating Environment For this feature.eRAN CS Fallback 7 Engineering Guidelines Figure 7-3 PS handover procedure ----End 7.6 Deactivation Run the MOD ENODEBALGOSWITCH command with the UtranCsfbSwitch(UtranCsfbSwitch) check box under the HoAlgoSwitch parameter cleared.2 or later. Table 7-10 License control item for CSFB to GERAN Feature LOFD-001034 CS Fallback to GERAN License Control Item Name CS Fall Back to GERAN License Control Item ID LLT1CFBG01 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.. check with the vendor whether the equipment supports this feature.4 Deploying CSFB to GERAN 7. If the core-network equipment is provided by Huawei. If the core-network equipment is provided by another vendor. 7. the version must be SAE1. 7-15 . Requirements for Licenses Operators must purchase and activate the following license.3. Ltd.4. There are three types of data sources: Network plan (negotiation required): Parameters are planned by operators and negotiated with the EPC or peer transmission equipment. Generic Data Before configuring CSFB to GERAN.Rac parameter must be set. Scenario-specific Data The following table describes the parameters that must be set in the ENodeBAlgoSwitch MO to set the handover mode and handover algorithm switches for CSFB to GERAN. GeranExternalCell: used to configure external GERAN cells.eRAN CS Fallback 7 Engineering Guidelines 7. Collect data for the parameters in the following MOs: GeranNfreqGroup: used to configure GERAN carrier frequency groups.BlindHoPriority parameter. collect the data related to neighbor relationships with GERAN cells. For more information about how to collect data for the parameters in these MOs. the GeranExternalCell. GeranNfreqGroupArfcn: used to configure absolute radio frequency channel numbers (ARFCNs) in each GERAN carrier frequency group. Ltd. This section provides only the information about MOs related to neighboring GERAN cells. GeranExternalCellPlmn: used to configure additional PLMN IDs for each shared external GERAN cell.. GeranNcell: used to configure neighbor relationships with GERAN cells. the blind-handover priority of the cell must be specified by the GeranNcell. see Mobility Management in Connected Mode Feature Parameter Description. Network plan (negotiation not required): Parameters are planned and set by operators. This MO is required only if the BTS providing the external GERAN cell works in RAN sharing with common carriers mode and multiple operators share the external GERAN cell. If a neighboring GERAN cell supports blind handovers according to the network plan. Scenario-specific data is collected only when necessary for a specific scenario. 7-16 .2 Data Preparation This section describes generic data and scenario-specific data to be collected. User-defined: Parameters are set as required by users.4. Generic data is necessary for all scenarios and must always be collected. If PS handover is used. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. not required) To activate PS handovers. If the InterRatHighestPri parameter is set to GERAN. A blind handover to an inter-RAT cell can be performed only if a blind-handover priority is specified for the inter-RAT cell. blind handovers reduce access delays but cause lower handover success rates. The following table describes the parameters that must be set in the CSFallBackBlindHoCfg MO to set the blind-handover priorities of different RATs for CSFB. select the GeranNaccSwitch(GeranNaccSwitch) check box. Network plan Set this parameter based on the network plan.eRAN CS Fallback 7 Engineering Guidelines Parameter Name Parameter ID Source Setting Description Set this parameter based on the network plan. Ltd. InterRatHighestPri Network plan Set this parameter based on the network plan. Network plan Set this parameter based on the network plan. This (negotiation parameter is set to GERAN by default and specifies not required) the medium-priority RAT to be considered in blind handovers for CSFB. select the GeranPsHoSwitch(GeranPsHoSwitch) check box. Network plan Handover HoModeSwitch (negotiation If none of the preceding check boxes is selected. select the BlindHoSwitch(BlindHoSwitch) check box. select the GeranCcoSwitch(GeranCcoSwitch) check box. Parameter Parameter ID Name CN Operator ID Highest priority InterRat Source Setting Description CSFallBackBlindHoCfg. this parameter cannot be set to GERAN. select the (negotiation GeranCsfbSwitch(GeranCsfbSwitch) check box. 7-17 . Mode switch not required) redirection will be used for CSFB to GERAN.. This (negotiation parameter is set to UTRAN by default and specifies not required) the high-priority RAT to be considered in blind handovers for CSFB. To activate blind handovers. Handover Algo switch HoAlgoSwitch Network plan To activate CSFB to GERAN. This CnOperatorId (negotiation parameter specifies the ID of the operator whose not required) RAT blind-handover priorities are to be set. To activate CCO. set this parameter to GERAN. To activate NACC. Ensure that this parameter is set to a different value from the InterRatHighestPri and InterRatLowestPri parameters. For CSFB to GERAN. Second priority InterRat InterRatSecondPri Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Compared with measurement-based handovers. Navigate to Introduction to the LTE General Configuration Window and refer to the generic procedure for setting parameters using the CME graphical user interface (GUI)." Step 2 Fill in the summary data file with the name of the user-defined template. set the parameters listed in Table 7-11. perform the following steps: Step 1 On the GUI. 7-18 ." See the M2000 Help for more information about operations in the general configuration window.4. GERAN GeranLcsCap LCS capability 7. ----End For descriptions of the user-defined template and summary data file and also the detailed procedure for configuring eNodeBs in batches. This method applies to users who are unfamiliar with the navigation tree. To find MOs in the planned area. find MOs in the navigation tree. and save the parameter settings as a user-defined template. Network plan Set this parameter based on the network plan. The parameter settings in the user-defined template will be applied to the eNodeBs after you import the summary data file into the CME.4 Initial Configuration Configuring a Single eNodeB Using the GUI Configure a single eNodeB in the general configuration window on the Configuration Management Express (CME) based on the MOs and parameters as described in section 7. Ltd.3 Precautions None 7. This (negotiation parameter is set to CDMA2000 by default and not required) specifies the low-priority RAT to be considered in blind handovers for CSFB.eRAN CS Fallback 7 Engineering Guidelines Parameter Parameter ID Name Lowest priority InterRat InterRatLowestPri Source Setting Description Network plan Set this parameter based on the network plan. This (negotiation parameter specifies the LCS capability of the not required) GERAN.4. The parameters are the same as those described in section 7. use either of the following methods: In the Object Group pane.. This method applies to users who are familiar with the navigation tree.2 "Data Preparation. see eNodeB Initial Configuration Guide. Press F1 to launch M2000 Help.4. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Ensure that this parameter is set to a different value from the InterRatHighestPri and InterRatSecondPri parameters.2 "Data Preparation. search an MO.4. Configuring eNodeBs in Batches To configure eNodeBs in batches. In the Search pane. Share mobile country code. ----End Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Base station colour code. Band indicator GERANNFREQGROUPARFCN GeranNfreqGroupArfcn Local cell identity. see Mobility Management in Connected Mode Feature Parameter Description. Mobile network code. ADD GERANEXTERNALCELLPLMN 5. ADD GERANEXTERNALCELL 4. Mobile network code. Routing area code configure indicator. Highest priority InterRat. 7-19 . ADD GERANNFREQGROUPARFCN 3. GERAN ARFCN GERANEXTERNALCELL GeranExternalCell Mobile country code. GERAN LCS capability Configuring a Single eNodeB Using MML Commands Step 1 Run the following commands to add neighbor relationships with GERAN cells: 1. Share mobile network code GERANNCELL GeranNcell Local cell identity. GERAN cell identity. Blind handover priority Handover Algo switch. BCCH group identity. Mobile country code. Band indicator. Second priority InterRat.. Mobile country code. Handover Mode switch ENODEBALGOSWITCH CSFALLBACKBLINDHOCFG ENodeBAlgoSwitch CSFallBackBlindHoCfg CN Operator ID. Mobile network code. BCCH group identity.eRAN CS Fallback 7 Engineering Guidelines Table 7-11 Parameters for CSFB to GERAN MO GERANNFREQGROUP Parameter Group Name GeranNfreqGroup Parameter Local cell identity. Location area code. Starting ARFCN. Step 2 Run the MOD ENODEBALGOSWITCH command to set the handover mode and handover algorithm switches for CSFB to GERAN. GERAN version. Location area code. DTM indication GERANEXTERNALCELLPLMN GeranExternalCellPlmn GERAN cell identity. Step 3 Run the MOD CSFALLBACKBLINDHOCFG command to set the blind-handover priorities of different RATs for CSFB. GERAN ARFCN. Network colour code. ADD GERANNFREQGROUP 2. Ltd. ADD GERANNCELL For details about parameter settings. Location area code. Lowest priority InterRat. GERAN cell identity. .1 Deployment Requirements Requirements for the Operating Environment For this feature. If the core-network equipment is provided by another vendor.5 Activation Observation The activation observation procedure is as follows: Step 1 Enable a UE to camp on an E-UTRAN cell and originate a voice call. Scenario-specific data is collected only when necessary for a specific scenario. Step 2 Enable the UE to camp on the E-UTRAN cell and receive a voice call.6 Deactivation Run the MOD ENODEBALGOSWITCH command with the GeranCsfbSwitch(GeranCsfbSwitch) check box under the HoAlgoSwitch parameter cleared. Table 7-12 License control item for CSFB to CDMA2000 1xRTT Feature License Control Item Name License Control Item ID LLT1CFBR01 LOFD-001035 CS Fallback CS Fall Back to CDMA2000 1xRTT(FDD) to CDMA2000 1xRTT 7. There are three types of data sources: Network plan (negotiation required): Parameters are planned by operators and negotiated with the EPC or peer transmission equipment. 7-20 . Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.2 Data Preparation This section describes generic data and scenario-specific data to be collected. If the core-network equipment is provided by Huawei.4.5 Deploying CSFB to CDMA2000 1xRTT 7. Ltd.4. 7. Network plan (negotiation not required): Parameters are planned and set by operators. User-defined: Parameters are set as required by users.5. You can observe the signaling procedures for CSFB to GERAN. Generic data is necessary for all scenarios and must always be collected. the version must be SAE1.3.5 "Activation Observation.2 or later. check with the vendor whether the equipment supports this feature. If the calls continue until they are ended. CSFB to GERAN takes effect.eRAN CS Fallback 7 Engineering Guidelines 7. which is the same as that for CSFB to UTRAN described in section 7. Requirements for Licenses Operators must purchase and activate the following license. the eNodeB must collaborate with core-network equipment." ----End 7.5. A blind handover to an inter-RAT cell can be performed only if a blind-handover priority is specified for the inter-RAT cell. For more information about how to collect data for the parameters in these MOs. see Mobility Management in Connected Mode Feature Parameter Description.. Cdma20001XRTTNcell: used to configure neighbor relationships with CDMA2000 1xRTT cells. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. select the BlindHoSwitch(BlindHoSwitch) check box. This MO is required only if the base station providing the external CDMA2000 cell works in RAN sharing with common carriers mode and multiple operators share the external CDMA2000 cell. select the Cdma1xRttRedirectSwitch(Cdma1xRttRedirectSwi tch) check box. the blind-handover priority of the cell must be specified by the Cdma20001XRTTNcell. The following table describes the parameters that must be set in the CSFallBackBlindHoCfg MO to set the blind-handover priorities of different RATs for CSFB. Parameter Name Parameter ID Source Setting Description Handover HoModeSwitch Network plan Set this parameter based on the network plan. Handover Algo switch To activate CSFB to CDMA2000 1xRTT. blind handovers reduce access delays but cause lower handover success rates. Scenario-specific Data The following table describes the parameters that must be set in the ENodeBAlgoSwitch MO to set the handover mode and handover algorithm switches for CSFB to CDMA2000 1xRTT. Compared with measurement-based handovers. 7-21 .BlindHoPriority parameter.eRAN CS Fallback 7 Engineering Guidelines Generic Data Before configuring CSFB to CDMA2000 1xRTT. collect the data related to neighbor relationships with CDMA2000 1xRTT cells. Ltd. Mode switch (negotiation not To activate redirection for CSFB to CDMA2000 required) 1xRTT. To activate blind handovers. If a neighboring CDMA2000 1xRTT cell supports blind handovers according to the network plan. Collect data for the parameters in the following MOs: Cdma2000BandClass: used to configure CDMA2000 band classes Cdma2000Nfreq: used to configure CDMA2000 frequencies Cdma2000ExternalCell: used to configure external CDMA2000 cells Cdma2000ExternalCellPlmn: used to configure additional PLMN IDs for each shared external CDMA2000 cell. select the HoAlgoSwitch Network plan (negotiation not Cdma1xRttCsfbSwitch(Cdma1xRttCsfbSwitch) required) check box. This section provides only the information about MOs related to neighboring CDMA2000 1xRTT cells. Network plan Set this parameter based on the network plan. Navigate to Introduction to the LTE General Configuration Window and refer to the generic procedure for setting parameters using the CME graphical user interface (GUI).. Network plan Set this parameter based on the network plan. This (negotiation parameter is set to UTRAN by default and not required) specifies the high-priority RAT to be considered in blind handovers for CSFB. This method applies to users who are familiar with the navigation tree. set this parameter to CDMA2000." See the M2000 Help for more information about operations in the general configuration window. Press F1 to launch M2000 Help. Second priority InterRat InterRatSecondPri Lowest priority InterRat InterRatLowestPri CDMA2000 CdmaLcsCap LCS capability 7. Highest priority InterRat InterRatHighestPri Network plan Set this parameter based on the network plan. This Operator ID CnOperatorId (negotiation parameter specifies the ID of the operator whose not required) RAT blind-handover priorities are to be set. Ensure that this parameter is set to a different value from the InterRatHighestPri and InterRatSecondPri parameters. search an MO.eRAN CS Fallback 7 Engineering Guidelines Parameter Parameter ID Name Source Setting Description CN CSFallBackBlindHoCfg.5. To find MOs in the planned area. For CSFB to CDMA2000 1xRTT. Ltd. This (negotiation parameter is set to GERAN by default and not required) specifies the medium-priority RAT to be considered in blind handovers for CSFB. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. find MOs in the navigation tree. Network plan Set this parameter based on the network plan. 7-22 .5. Ensure that this parameter is set to a different value from the InterRatHighestPri and InterRatLowestPri parameters.2 "Data Preparation.4 Initial Configuration Configuring a Single eNodeB Using the GUI Configure a single eNodeB in the general configuration window on the Configuration Management Express (CME) based on the MOs and parameters as described in section 7. In the Search pane. use either of the following methods: In the Object Group pane. This method applies to users who are unfamiliar with the navigation tree. Network plan Set this parameter based on the network plan.3 Precautions None 7. This (negotiation parameter is set to CDMA2000 by default and not required) specifies the low-priority RAT to be considered in blind handovers for CSFB.5. This (negotiation parameter specifies the LCS capability of the not required) CDMA2000 1xRTT network. CDMA2000 neighbor cell type. see eNodeB Initial Configuration Guide. Sector identity. ADD CDMA20001XRTTNCELL Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Frequency Sector identity. Share mobile network code CDMA20001XRTTNCELL ENODEBALGOSWITCH CSFALLBACKBLINDHOCFG Cdma20001xrttNcell ENodeBAlgoSwitch CSFallBackBlindHoCfg Local cell identity. ADD CDMA2000NFREQ 3. ADD CDMA2000EXTERNALCELLPLMN 5. Band class. Mobile network code CDMA2000EXTERNALCELLPLMN Cdma2000ExternalCellPlmn Sector identity. Band class. Band class Local cell identity. Ltd. set the parameters listed in Table 7-13. Second priority InterRat. ----End For descriptions of the user-defined template and summary data file and also the detailed procedure for configuring eNodeBs in batches. ADD CDMA2000BANDCLASS 2. 7-23 . Mobile country code. Frequency. Table 7-13 Parameters for CSFB to CDMA2000 1xRTT MO CDMA2000BANDCLASS CDMA2000NFREQ CDMA2000EXTERNALCELL Parameter Group Name Cdma2000BandClass Cdma2000Nfreq Cdma2000ExternalCell Parameter Local cell identity.. The parameters are the same as those described in section 7. Share mobile country code.eRAN CS Fallback 7 Engineering Guidelines Configuring eNodeBs in Batches To configure eNodeBs in batches. perform the following steps: Step 1 On the GUI. Lowest priority InterRat." Step 2 Fill in the summary data file with the name of the user-defined template. Physical cell identity. and save the parameter settings as a user-defined template. ADD CDMA2000EXTERNALCELL 4.2 "Data Preparation. Highest priority InterRat. CDMA2000 LCS capability Configuring a Single eNodeB Using MML Commands Step 1 Run the following commands to add neighbor relationships with CDMA2000 1xRTT cells: 1. Handover Mode switch CN Operator ID. The parameter settings in the user-defined template will be applied to the eNodeBs after you import the summary data file into the CME.5. Blind handover priority Handover Algo switch. 7-24 .5 Activation Observation The activation observation procedure is as follows: Step 1 Enable a UE to camp on an E-UTRAN cell and originate a voice call.. Table 7-14 License control item for flash CSFB to UTRAN Feature LOFD-001033 CS Fallback to UTRAN LOFD-001052 Flash CS Fallback to UTRAN License Control Item Name License Control Item ID CS Fall Back to UTRAN LLT1CFBU01 Flash CS Fallback to UTRAN LLT1FCFBU01 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Ltd.5.3. ----End 7. Requirements for Licenses Operators must purchase and activate the following licenses. You can observe the signaling procedures for CSFB to CDMA2000 1xRTT.1 Deployment Requirements Requirements for the Operating Environment For this feature. If the calls continue until they are ended. Step 2 Run the MOD ENODEBALGOSWITCH command to set the handover mode and handover algorithm switches for CSFB to CDMA2000 1xRTT. check with the vendor whether the equipment supports this feature.2 or later.5 "Activation Observation. the eNodeB must collaborate with core-network equipment." ----End 7. Step 2 Enable the UE to camp on the E-UTRAN cell and receive a voice call. CSFB to CDMA2000 1xRTT takes effect.eRAN CS Fallback 7 Engineering Guidelines For details about parameter settings. see Mobility Management in Connected Mode Feature Parameter Description.5. Step 3 Run the MOD CSFALLBACKBLINDHOCFG command to set the blind-handover priorities of different RATs for CSFB.6 Deactivation Run the MOD ENODEBALGOSWITCH command with the Cdma1xRttCsfbSwitch(Cdma1xRttCsfbSwitch) check box under the HoAlgoSwitch parameter cleared. the version must be SAE1. 7.6. If the core-network equipment is provided by another vendor. which is the same as that for CSFB to UTRAN described in section 7. If the core-network equipment is provided by Huawei.6 Deploying Flash CSFB to UTRAN 7. Scenario-specific Data The following table describes the parameters that must be set in the ENodeBAlgoSwitch MO to set the handover mode and handover algorithm switches for flash CSFB to UTRAN. CSFB to UTRAN based on PS handover instead of flash CSFB to UTRAN is used for UEs that support PS handovers. UtranExternalCellPlmn: used to configure additional PLMN IDs for each shared external UTRAN cell. collect the data related to neighbor relationships with UTRAN cells. see Mobility Management in Connected Mode Feature Parameter Description. For more information about how to collect data for the parameters in these MOs.6. select the not required) BlindHoSwitch(BlindHoSwitch) check box." 7. the blind-handover priority of the cell must be specified by the UtranNCell. Generic Data Before configuring CSFB to UTRAN. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.2 Data Preparation This section describes generic data and scenario-specific data to be collected. Mode switch (negotiation To activate blind handovers. Parameter Name Parameter ID Source Setting Description Handover HoModeSwitch Network plan Set this parameter based on the network plan. This section provides only the information about MOs related to neighboring UTRAN cells and key parameters in these MOs.Rac parameter must be set. UtranNCell: used to configure neighbor relationships with UTRAN cells. UtranExternalCell: used to configure external UTRAN cells. Collect data for the parameters in the following MOs: UtranNFreq: used to configure neighboring UTRAN frequencies. Ltd. blind handovers reduce access delays but cause lower handover success rates. Compared with measurement-based handovers. User-defined: Parameters are set as required by users. If PS handover is used. There are three types of data sources: Network plan (negotiation required): Parameters are planned by operators and negotiated with the EPC or peer transmission equipment. Generic data is necessary for all scenarios and must always be collected.BlindHoPriority parameter. Scenario-specific data is collected only when necessary for a specific scenario. This MO is required only if the NodeB providing the external UTRAN cell works in RAN sharing with common carriers mode and multiple operators share the external UTRAN cell..eRAN CS Fallback NOTE 7 Engineering Guidelines If PS handover for CSFB to UTRAN is enabled. For details. Network plan (negotiation not required): Parameters are planned and set by operators. see section 5. A blind handover to an inter-RAT cell can be performed only if a blind-handover priority is specified for the inter-RAT cell. If a neighboring UTRAN cell supports blind handovers according to the network plan. the UtranExternalCell. 7-25 .3 "Affected Features. the eNodeB sends RAN-INFORMATION-REQUEST/Single Report PDUs to UTRAN cells to request single reports. (negotiation This parameter is set to UTRAN by default and not required) specifies the high-priority RAT to be considered in blind handovers for CSFB. RimSwitch Network plan UTRAN_RIM_SWITCH under this parameter (negotiation specifies whether to enable or disable the RIM procedure not required) that requests event-driven multiple reports from UTRAN cells. The following table describes the parameters that must be set in the CSFallBackBlindHoCfg MO to set the blind-handover priorities of different RATs for CSFB. it is recommended that you select the UTRAN_RIM_SWITCH(UTRAN_RIM_SWITCH) check box. 7-26 . If the UTRAN cells support RAN-INFORMATION-REQUEST/Multiple Report PDUs. the eNodeB can send RAN-INFORMATION-REQUEST/Multiple Report protocol data units (PDUs) to UTRAN cells to request event-driven multiple reports. For flash CSFB to UTRAN. Parameter Parameter ID Name CN Operator ID Highest priority InterRat Source Setting Description CSFallBackBlindHoCfg. Network plan Set this parameter based on the network plan. the eNodeB cannot send RAN-INFORMATION-REQUEST/Multiple Report PDUs to UTRAN cells. InterRatHighestPri Network plan Set this parameter based on the network plan. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. If this switch is turned off. If this switch is turned off and the UtranFlashCsfbSwitch(UtranFlashCsfbSwitch) check box under HoAlgoSwitch is selected. RIM switch If this switch is turned on.. CnOperatorId (negotiation This parameter specifies the ID of the not required) operator whose RAT blind-handover priorities are to be set. Ltd. select the (negotiation UtranCsfbSwitch(UtranCsfbSwitch) and not required) UtranFlashCsfbSwitch(UtranFlashCsfbSwitch) check boxes. retain the default value.eRAN CS Fallback 7 Engineering Guidelines Parameter Name Handover Algo switch Parameter ID Source Setting Description HoAlgoSwitch Network plan To activate flash CSFB to UTRAN. Ensure that this parameter is set to a different value from the InterRatHighestPri and InterRatLowestPri parameters.4 Initial Configuration Configuring a Single eNodeB Using the GUI Configure a single eNodeB in the general configuration window on the Configuration Management Express (CME) based on the MOs and parameters as described in section 7.eRAN CS Fallback 7 Engineering Guidelines Parameter Parameter ID Name Second priority InterRat InterRatSecondPri Source Setting Description Network plan Set this parameter based on the network plan. (negotiation This parameter specifies the LCS capability of the not required) UTRAN. Network plan Set this parameter based on the network plan. set the parameters listed in Table 7-15. Ensure that this parameter is set to a different value from the InterRatHighestPri and InterRatSecondPri parameters. Press F1 to launch M2000 Help." See the M2000 Help for more information about operations in the general configuration window. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. To find MOs in the planned area. This method applies to users who are familiar with the navigation tree..6. perform the following steps: Step 1 On the GUI. 7-27 . Ltd. Network plan Set this parameter based on the network plan. In the Search pane.6. This method applies to users who are unfamiliar with the navigation tree. Lowest priority InterRat InterRatLowestPri UTRAN LCS capability UtranLcsCap 7. and save the parameter settings as a user-defined template. Navigate to Introduction to the LTE General Configuration Window and refer to the generic procedure for setting parameters using the CME graphical user interface (GUI).3 Precautions None 7. The parameters are the same as those described in section 7. search an MO. Configuring eNodeBs in Batches To configure eNodeBs in batches. use either of the following methods: In the Object Group pane. (negotiation This parameter is set to GERAN by default and not required) specifies the medium-priority RAT to be considered in blind handovers for CSFB.2 "Data Preparation.6.6.2 "Data Preparation." Step 2 Fill in the summary data file with the name of the user-defined template. (negotiation This parameter is set to CDMA2000 by default and not required) specifies the low-priority RAT to be considered in blind handovers for CSFB. find MOs in the navigation tree. Highest priority InterRat. Redirection switch. Share mobile network code Local cell identity. Location area code UTRAN cell identity. ----End For descriptions of the user-defined template and summary data file and also the detailed procedure for configuring eNodeBs in batches. Mobile country code. Handover Mode switch. Blind handover priority Handover Algo switch. RNC identity. Mobile network code.. Lowest priority InterRat. Mobile network code. Mobile network code. UTRAN cell identity. Routing area code configure indicator. see eNodeB Initial Configuration Guide. handover algorithm switches. UTRAN cell identity. Downlink UARFCN Mobile country code. ADD UTRANEXTERNALCELLPLMN 4. Step 2 Run the MOD ENODEBALGOSWITCH command to set the handover mode. 2. Table 7-15 Parameters for flash CSFB to UTRAN MO UTRANNFREQ Parameter Group Name Parameter UtranNFreq Local cell identity. Routing area code. ADD UTRANNFREQ 2. ADD UTRANEXTERNALCELL 3. Mobile country code. Primary scrambling code. Downlink UARFCN. UTRAN LCS capability UTRANEXTERN UtranExternalCell ALCELL UTRANEXTERN UtranExternalCellPlmn ALCELLPLMN UTRANNCELL UtranNCell ENODEBALGOS ENodeBAlgoSwitch WITCH CSFALLBACKBLI CSFallBackBlindHoCfg NDHOCFG Configuring a Single eNodeB Using MML Commands Step 1 Run the following commands to add neighbor relationships with UTRAN cells: 1. Share mobile country code. Second priority InterRat. run the following commands to turn off and then turn on the RIM procedure switch: 1. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.eRAN CS Fallback 7 Engineering Guidelines The parameter settings in the user-defined template will be applied to the eNodeBs after you import the summary data file into the CME. ADD UTRANNCELL For details about parameter settings. NOTE To manually trigger an RIM procedure. MOD ENODEBALGOSWITCH: RimSwitch=UTRAN_RIM_SWITCH-0 MOD ENODEBALGOSWITCH: RimSwitch=UTRAN_RIM_SWITCH-1 Step 3 Run the MOD CSFALLBACKBLINDHOCFG command to set the blind-handover priorities of different RATs for CSFB. see Mobility Management in Connected Mode Feature Parameter Description. Ltd. and RIM procedure switch for flash CSFB to UTRAN. RIM switch CN Operator ID. 7-28 . redirection algorithm switch. .5 "Activation Observation.3 "Affected Features. check with the vendor whether the equipment supports this feature. For details. Scenario-specific data is collected only when necessary for a specific scenario.6. 7. If the call continues and the RRC Connection Release message traced on the Uu interface carries the information of the neighboring UTRAN cell. the eNodeB must collaborate with core-network equipment.7 Deploying Flash CSFB to GERAN 7.1 Deployment Requirements Requirements for the Operating Environment For this feature. CSFB to GERAN based on PS handover instead of flash CSFB to GERAN is used for UEs that support PS handovers. The signaling procedure for flash CSFB to UTRAN is similar to that for CSFB to UTRAN described in section 7. 7-29 . the eNodeB has obtained the system information of this neighboring UTRAN cell. 7. Requirements for Licenses Operators must purchase and activate the following licenses. flash CSFB to UTRAN has been activated successfully.5 Activation Observation Enable a UE to camp on an E-UTRAN cell and originate a voice call. Generic data is necessary for all scenarios and must always be collected. the version must be SAE1. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co." 7. If the core-network equipment is provided by another vendor.6.7.2 or later. If the ID of a neighboring UTRAN cell is displayed in the command output.eRAN CS Fallback 7 Engineering Guidelines ----End 7.3. see section 5.7. Check the status of the RIM procedure towards neighboring UTRAN cells by running the DSP UTRANRIMINFO command.6 Deactivation Run the MOD ENODEBALGOSWITCH command with the UtranFlashCsfbSwitch(UtranFlashCsfbSwitch) check box under the HoAlgoSwitch parameter cleared." The difference is that the RRC Connection Release message carries the information of the neighboring UTRAN cell. Table 7-16 License control item for flash CSFB to GERAN Feature LOFD-001034 CS Fallback to GERAN License Control Item Name License Control Item ID CS Fall Back to GERAN LLT1CFBG01 LOFD-001053 Flash CS Fallback to GERAN Flash CS Fallback to GERAN LLT1FCFBG01 NOTE If PS handover for CSFB to GERAN is enabled. If the core-network equipment is provided by Huawei. Ltd.2 Data Preparation This section describes generic data and scenario-specific data to be collected. Generic Data Before configuring CSFB to GERAN. For more information about how to collect data for the parameters in these MOs. To activate blind handovers. see Mobility Management in Connected Mode Feature Parameter Description. the eNodeB can send Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Ltd. select the BlindHoSwitch(BlindHoSwitch) check box. blind handovers reduce access delays but cause lower handover success rates. Network plan (negotiation not required): Parameters are planned and set by operators. GeranExternalCellPlmn: used to configure additional PLMN IDs for each shared external GERAN cell. Parameter Name Parameter ID Source Network plan (negotiation not required) Setting Description Set this parameter based on the network plan. User-defined: Parameters are set as required by users. GeranExternalCell: used to configure external GERAN cells. select the GeranCsfbSwitch(GeranCsfbSwitch) and GeranFlashCsfbSwitch(GeranFlashCsfbSwitch) check boxes. 7-30 . collect the data related to neighbor relationships with GERAN cells. GERAN_RIM_SWITCH under this parameter specifies whether to enable or disable the RIM procedure that requests event-driven multiple reports from GERAN cells. Scenario-specific Data The following table describes the parameters that must be set in the ENodeBAlgoSwitch MO to set the handover mode and handover algorithm switches for flash CSFB to GERAN. GeranNcell: used to configure neighbor relationships with GERAN cells. the GeranExternalCell. GeranNfreqGroupArfcn: used to configure ARFCNs in each GERAN carrier frequency group. This MO is required only if the BTS providing the external GERAN cell works in RAN sharing with common carriers mode and multiple operators share the external GERAN cell. Handover HoModeSwitch Mode switch Handover Algo switch HoAlgoSwitch Network plan (negotiation not required) Network plan (negotiation not required) RIM switch RimSwitch If this switch is turned on.BlindHoPriority parameter.Rac parameter must be set.. the blind-handover priority of the cell must be specified by the GeranNcell. If a neighboring GERAN cell supports blind handovers according to the network plan. To activate flash CSFB to GERAN.eRAN CS Fallback 7 Engineering Guidelines There are three types of data sources: Network plan (negotiation required): Parameters are planned by operators and negotiated with the EPC or peer transmission equipment. This section provides only the information about MOs related to neighboring GERAN cells and key parameters in these MOs. Compared with measurement-based handovers. If PS handover is used. Collect data for the parameters in the following MOs: GeranNfreqGroup: used to configure GERAN carrier frequency groups. A blind handover to an inter-RAT cell can be performed only if a blind-handover priority is specified for the inter-RAT cell. If this switch is turned off. This (negotiation parameter is set to GERAN by default and specifies not required) the medium-priority RAT to be considered in blind handovers for CSFB. This (negotiation parameter is set to UTRAN by default and specifies not required) the high-priority RAT to be considered in blind handovers for CSFB. If this switch is turned off and the GeranFlashCsfbSwitch(GeranFlashCsfbSwitch) check box under HoAlgoSwitch is selected. The following table describes the parameters that must be set in the CSFallBackBlindHoCfg MO to set the blind-handover priorities of different RATs for CSFB. InterRatHighestPri Network plan Set this parameter based on the network plan. set this parameter to GERAN. Ltd. This (negotiation parameter is set to CDMA2000 by default and not required) specifies the low-priority RAT to be considered in blind handovers for CSFB. Second priority InterRat InterRatSecondPri Lowest priority InterRat InterRatLowestPri Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Network plan Set this parameter based on the network plan. this parameter cannot be set to GERAN.eRAN CS Fallback 7 Engineering Guidelines Parameter Name Parameter ID Source Setting Description RAN-INFORMATION-REQUEST/Multiple Report PDUs to GERAN cells to request event-driven multiple reports. Ensure that this parameter is set to a different value from the InterRatHighestPri and InterRatSecondPri parameters. If the InterRatHighestPri parameter is set to GERAN. the eNodeB sends RAN-INFORMATION-REQUEST/Single Report PDUs to GERAN cells to request single reports. the eNodeB cannot send RAN-INFORMATION-REQUEST/Multiple Report PDUs to GERAN cells. If the GERAN cells support RAN-INFORMATION-REQUEST/Multiple Report PDUs. Network plan Set this parameter based on the network plan. For flash CSFB to GERAN. This CnOperatorId (negotiation parameter specifies the ID of the operator whose not required) RAT blind-handover priorities are to be set. it is recommended that you select the GERAN_RIM_SWITCH(GERAN_RIM_SWITCH) check box. Network plan Set this parameter based on the network plan.. 7-31 . Ensure that this parameter is set to a different value from the InterRatHighestPri and InterRatLowestPri parameters. Parameter Parameter ID Name CN Operator ID Highest priority InterRat Source Setting Description CSFallBackBlindHoCfg. 3 Precautions None 7. set the parameters listed in Table 7-17. Starting ARFCN.7. Navigate to Introduction to the LTE General Configuration Window and refer to the generic procedure for setting parameters using the CME graphical user interface (GUI). search an MO. This (negotiation parameter specifies the LCS capability of the not required) GERAN.2 "Data Preparation.. The parameter settings in the user-defined template will be applied to the eNodeBs after you import the summary data file into the CME. This method applies to users who are unfamiliar with the navigation tree. GERAN version. 7-32 ." See the M2000 Help for more information about operations in the general configuration window.7. The parameters are the same as those described in section 7.7. Press F1 to launch M2000 Help.4 Initial Configuration Configuring a Single eNodeB Using the GUI Configure a single eNodeB in the general configuration window on the Configuration Management Express (CME) based on the MOs and parameters as described in section 7. ----End For descriptions of the user-defined template and summary data file and also the detailed procedure for configuring eNodeBs in batches. 7. BCCH group identity.2 "Data Preparation. and save the parameter settings as a user-defined template. Configuring eNodeBs in Batches To configure eNodeBs in batches. This method applies to users who are familiar with the navigation tree. Table 7-17 Parameters for flash CSFB to GERAN MO GERANNFREQGROUP Parameter Group Name Parameter GeranNfreqGroup Local cell identity.7. To find MOs in the planned area.eRAN CS Fallback 7 Engineering Guidelines Parameter Parameter ID Name GERAN LCS capability GeranLcsCap Source Setting Description Network plan Set this parameter based on the network plan." Step 2 Fill in the summary data file with the name of the user-defined template. In the Search pane. see eNodeB Initial Configuration Guide. use either of the following methods: In the Object Group pane. Band indicator Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Ltd. find MOs in the navigation tree. perform the following steps: Step 1 On the GUI. . Mobile network code. Location area code. Share mobile network code GERANNCELL GeranNcell Local cell identity. Mobile network code. Location area code. Network colour code. and RIM procedure switch for flash CSFB to GERAN. GERAN ARFCN GERANEXTERNALCELL GeranExternalCell Mobile country code. Redirection switch. Band indicator. GERAN ARFCN. redirection algorithm switch. 7-33 . ADD GERANNFREQGROUPARFCN 3. Share mobile country code. handover algorithm switches. Mobile country code. Mobile network code. ADD GERANEXTERNALCELLPLMN 5. DTM indication GERANEXTERNALCELLPLMN GeranExternalCellPlmn GERAN cell identity. GERAN LCS capability Configuring a Single eNodeB Using MML Commands Step 1 Run the following commands to add neighbor relationships with GERAN cells: 1. ADD GERANEXTERNALCELL 4. Second priority InterRat. ADD GERANNFREQGROUP 2. Base station colour code. GERAN cell identity. Highest priority InterRat. RIM switch ENODEBALGOSWITCH CSFALLBACKBLINDHOCFG ENodeBAlgoSwitch CSFallBackBlindHoCfg CN Operator ID. Step 2 Run the MOD ENODEBALGOSWITCH command to set the handover mode. GERAN cell identity. Step 3 Run the MOD CSFALLBACKBLINDHOCFG command to set the blind-handover priorities of different RATs for CSFB. ADD GERANNCELL For details about parameter settings. Routing area code configure indicator. Handover Mode switch. see Mobility Management in Connected Mode Feature Parameter Description. Routing area code. Ltd. ----End Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Lowest priority InterRat. Mobile country code. Location area code.eRAN CS Fallback 7 Engineering Guidelines MO Parameter Group Name Parameter GERANNFREQGROUPARFCN GeranNfreqGroupArfcn Local cell identity. BCCH group identity. Blind handover priority Handover Algo switch. 3. If the core-network equipment is provided by another vendor.7.7.4 Initial Configuration CSFB with LAI to UTRAN is automatically activated when two conditions are met: Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Ltd. If the core-network equipment is provided by Huawei. The signaling procedure for flash CSFB to GERAN is similar to that for CSFB to UTRAN described in section 7." 7. 7. check with the vendor whether the equipment supports this feature.5 "Activation Observation. Check the status of the RIM procedure towards neighboring GERAN cells by running the DSP GERANRIMINFO command. flash CSFB to GERAN has been activated successfully.8 Deploying CSFB with LAI to UTRAN 7.3 Precautions None 7. 7-34 .8. the version must be SAE1.8. 7.3. the eNodeB has obtained the system information of this neighboring GERAN cell. the eNodeB must collaborate with core-network equipment.1 Deployment Requirements Requirements for the Operating Environment For this feature.eRAN CS Fallback 7 Engineering Guidelines 7. If the ID of a neighboring GERAN cell is displayed in the command output.6 Deactivation Run the MOD ENODEBALGOSWITCH command with the GeranFlashCsfbSwitch(GeranFlashCsfbSwitch) check box under the HoAlgoSwitch parameter cleared.5 Activation Observation Enable a UE to camp on an E-UTRAN cell and originate a voice call.8.2 "Data Preparation.2 or later. If the call continues and the RRC Connection Release message traced on the Uu interface carries the information of the neighboring GERAN cell.8. Table 7-18 License control item for CSFB with LAI to UTRAN Feature License Control Item Name License Control Item ID LLT1CFLU01 LOFD-001068 CS Fallback with LAI to CS Fallback with LAI to UTRAN UTRAN 7. Requirements for Licenses Operators must purchase and activate the following license.2 Data Preparation Data preparation for CSFB with LAI to UTRAN is the same as that for CSFB to UTRAN described in section 7.." The difference is that the RRC Connection Release message carries the information of the neighboring GERAN cell. Step 2 Ensure that the signal strengths of the two UTRAN cells both reach the threshold for event B1. If the core-network equipment is provided by another vendor.8. see section 7.9." 7. 7-35 .6 "Deactivation. You can query the threshold by running the LST INTERRATHOUTRANGROUP command. Step 3 Enable a UE to camp on the E-UTRAN cell and originate a voice call. which is similar to that for CSFB to UTRAN described in section 7.9 Deploying CSFB with LAI to GERAN 7.5 "Activation Observation.6 Deactivation CSFB with LAI to UTRAN is automatically deactivated when its license or CSFB to UTRAN is deactivated. CSFB to UTRAN has been activated.3.3. Table 7-19 License control item for CSFB with LAI to GERAN Feature License Control Item Name License Control Item ID LLT1CFLG01 LOFD-001069 CS Fallback with LAI to CS Fallback with LAI to GERAN GERAN Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.4 "Initial Configuration. ----End 7." The difference is that the Initial Context Setup Request message carries the LAI that the MME delivers to the eNodeB. For details about how to activate CSFB to UTRAN. and enable the MME to include only one of the two LAIs in the instructions that will be delivered to the eNodeB in Step 3 and Step 4. CSFB with LAI to UTRAN takes effect. This feature can be deployed only when the core-network equipment supports it.8.5 Activation Observation The activation observation procedure is as follows: Step 1 Configure two neighboring UTRAN cells with different LAIs for an E-UTRAN cell. the eNodeB must collaborate with core-network equipment.." 7. For details about how to deactivate CSFB to UTRAN.3. Requirements for Licenses Operators must purchase and activate the following license. If the calls continue until they are ended. Ltd. You can observe the signaling procedure for CSFB with LAI to UTRAN. see section 7. check with the vendor whether the equipment supports this feature. Step 4 Enable the UE to camp on the E-UTRAN cell and receive a voice call.1 Deployment Requirements Requirements for the Operating Environment For this feature.2 or later. If the core-network equipment is provided by Huawei. the version must be SAE1.eRAN CS Fallback 7 Engineering Guidelines The license for this feature has been activated. E2G. see section 7.E2W.6 "Deactivation. If the calls continue until they are ended.E2G.CSFB.3.9.eRAN CS Fallback 7 Engineering Guidelines 7.E2G counters (corresponding to UMTS and GSM.1 Monitoring CSFB allows UEs under LTE coverage to shift to CS networks when CS services arrive.4.CSFB.RRCRedirection.4.PrepAtt and L." 7.E2W and L.6 Deactivation CSFB with LAI to GERAN is automatically deactivated when its license or CSFB to GERAN is deactivated." The difference is that the Initial Context Setup Request message carries the LAI that the MME delivers to the eNodeB. 7-36 . respectively) to distinguish between the target CS networks." 7. Step 3 Enable a UE to camp on the E-UTRAN cell and originate a voice call.E2W. L.IRATHO.CSFB. For details about how to activate CSFB to GERAN. which is similar to that for CSFB to UTRAN described in section 7. You can query the threshold by running the LST INTERRATHOGERANGROUP command. You can observe the signaling procedure for CSFB with LAI to GERAN. Use the L. ----End 7.5 "Activation Observation. Use the L. Ltd. CSFB to GERAN has been activated.4 "Initial Configuration.PrepAttOut.IRATHO. L..9. and enable the MME to include only one of the two LAIs in the instructions that will be delivered to the eNodeB in Step 3 and Step 4. Step 4 Enable the UE to camp on the E-UTRAN cell and receive a voice call." 7. For details about how to deactivate CSFB to GERAN.2 "Data Preparation. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.4 Initial Configuration This feature is automatically activated when two conditions are met: The license for this feature has been activated. CSFB with LAI to GERAN takes effect.9.10 Performance Optimization 7.2 Data Preparation Data preparation for CSFB with LAI to GERAN is the same as that for CSFB to GERAN described in section 7.PrepAttOut counters to monitor the CSFB mechanisms including redirections and handovers.5 Activation Observation The activation observation procedure is as follows: Step 1 Configure two neighboring GERAN cells with different LAIs for an E-UTRAN cell.9.3 Precautions None 7. Step 2 Ensure that the signal strengths of the two GERAN cells both reach the threshold for event B1. Use the L. see section 7. and L.PrepSucc counters to monitor CSFB performance.9.CSFB.10.RRCRedirection.4. eRAN CS Fallback NOTE 7 Engineering Guidelines The L.RRCRedirection.E2W and L.RRCRedirection.E2G counters measure all redirections including those caused by factors other than CSFB. The L.IRATHO.E2W.PrepAttOut and L.IRATHO.E2G.PrepAttOut counters measure all handovers including those caused by factors other than CSFB. CSFB is an end-to-end service. The performance counters on the LTE side only indicate the success rate of the CSFB procedure on the LTE side. Therefore, the performance counters on the LTE side cannot directly show the user experience of the CSFB procedure. It is recommended that you perform drive tests and use the performance counters on the UE side to indicate the actual user experience of the CSFB procedure. 7.10.2 Parameter Optimization Blind Handovers for CSFB Compared with measurement-based handovers, blind handovers reduce access delays but cause lower handover success rates. Set blind-handover priorities of different RATs according to the operator's policy. When the handover success rate or service setup success rate is low due to poor UTRAN or GERAN coverage, adjust the blind-handover priorities for different RATs or deactivate blind handovers to improve CSFB performance. The following table describes the parameters in the CSFallBackBlindHoCfg MO used to set the blind-handover priorities of different RATs for CSFB. Parameter Parameter ID Name CN Operator ID Highest priority InterRat Second priority InterRat Source Setting Description CSFallBackBlindHoCfg. Network plan Set this parameter based on the network plan. This CnOperatorId (negotiation parameter specifies the ID of the operator whose not required) RAT blind-handover priorities are to be set. InterRatHighestPri Network plan Set this parameter based on the network plan. This (negotiation parameter is set to UTRAN by default and specifies not required) the high-priority RAT to be considered in blind handovers for CSFB. Network plan Set this parameter based on the network plan. This (negotiation parameter is set to GERAN by default and specifies not required) the medium-priority RAT to be considered in blind handovers for CSFB. Ensure that this parameter is set to a different value from the InterRatHighestPri and InterRatLowestPri parameters. Network plan Set this parameter based on the network plan. This (negotiation parameter is set to CDMA2000 by default and not required) specifies the low-priority RAT to be considered in blind handovers for CSFB. Ensure that this parameter is set to a different value from the InterRatHighestPri and InterRatSecondPri parameters. InterRatSecondPri Lowest priority InterRat InterRatLowestPri The following table describes the parameter in the ENodeBAlgoSwitch MO used to activate or deactivate blind handovers. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 7-37 eRAN CS Fallback 7 Engineering Guidelines Parameter Name Parameter ID Source Setting Description Handover HoModeSwitch Network plan To activate blind handovers, select the Mode switch (negotiation not BlindHoSwitch(BlindHoSwitch) check box. A blind required) handover to an inter-RAT cell can be performed only if a blind-handover priority is specified for the inter-RAT cell. Compared with measurement-based handovers, blind handovers reduce access delays but cause lower handover success rates. To deactivate blind handovers, clear the BlindHoSwitch(BlindHoSwitch) check box. Measurement-based Handovers for CSFB An appropriate event B1 threshold for CSFB ensures that inter-RAT handovers are triggered in a timely fashion. A high threshold results in a low probability of triggering event B1, thereby affecting user experience. A low threshold results in a high probability of triggering event B1, but causes a high probability of incorrect handover decisions and a low handover success rate. Tune the threshold based on site conditions. Event B1 for CSFB has a time-to-trigger parameter. This parameter lowers the probability of incorrect handover decisions and raises the handover success rate. However, if the value of this parameter is too large, CSFB delay is extended, affecting user experience. Tune this parameter based on site conditions. Appropriate settings of the threshold and time-to-trigger for event B1 raise the handover success rate and lower the call drop rate. The related parameters are as follows: CSFB to UTRAN: CsfbHoUtranB1ThdRscp, CsfbHoUtranB1ThdEcn0, and CsfbHoUtranTimeToTrig CSFB to GERAN: CsfbHoGeranB1Thd and CsfbHoGeranTimeToTrig CSFB to CDMA2000 1xRTT: CsfbHoCdmaB1ThdPs and CsfbHoCdmaTimeToTrig These parameters belong to the CSFALLBACKHO MO and are described in the following table. Parameter Parameter ID Name Source Setting Description Set this parameter based on the network Local cell ID CSFALLBACKHO.LocalCellId Network plan plan. (negotiation not required) Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 7-38 eRAN CS Fallback 7 Engineering Guidelines Parameter Parameter ID Name CSFB Utran CsfbHoUtranTimeToTrig EventB1 Time To Trig Source Setting Description Network Set this parameter based on the network plan plan. This parameter specifies the (negotiation time-to-trigger for event B1 in CSFB to not required) UTRAN. When CSFB to UTRAN is required, this parameter must be set, because it is used by UEs as one of the conditions for triggering event B1. When a UE detects that the signal quality in at least one UTRAN cell meets the entering condition, it does not immediately send a measurement report to the eNodeB. Instead, the UE sends a measurement report only when the signal quality has been meeting the entering condition throughout a period defined by this parameter. An appropriate value for this parameter reduces the probability of random events B1 and the average number of handovers, thereby eliminating unnecessary handovers. CSFB UTRAN EventB1 RSCP Trigger Threshold CsfbHoUtranB1ThdRscp Network Set this parameter based on the network plan plan. This parameter specifies the RSCP (negotiation threshold for event B1 in CSFB to UTRAN. not required) When CSFB to UTRAN is required, this parameter must be set, because it is used by UEs as one of the conditions for triggering event B1. Event B1 is triggered when the RSCP measured by the UE is higher than the value of this parameter and all other conditions are also met. Network This parameter specifies the Ec/No threshold plan for event B1 in CSFB to UTRAN. When (negotiation CSFB to UTRAN is required, this parameter not required) must be set, because it is used by UEs as one of the conditions for triggering event B1. Event B1 is triggered when the Ec/No measured by the UE is higher than the value of this parameter and all other conditions are also met. Set this parameter to a large value for a cell with a large signal fading variance in order to reduce the probability of unnecessary handovers. Set this parameter to a small value for a cell with a small signal fading variance in order to ensure timely handovers. CSFB UTRAN EventB1 ECN0 Trigger Threshold CsfbHoUtranB1ThdEcn0 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 7-39 . This parameter specifies the RSSI (negotiation threshold for event B1 in CSFB to GERAN. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. This parameter specifies the pilot (negotiation strength threshold for event B1 in CSFB to not required) CDMA2000 1xRTT. When a UE detects that the signal quality in at least one GERAN cell meets the entering condition. Event B1 is triggered when the measured pilot strength of a CDMA2000 1xRTT cell reaches the value of this parameter and all other conditions are also met. Network Set this parameter based on the network plan plan. This parameter specifies the (negotiation time-to-trigger for event B1 in CSFB to not required) GERAN. the UE sends a measurement report only when the signal quality has been meeting the entering condition throughout a period defined by this parameter.eRAN CS Fallback 7 Engineering Guidelines Parameter Parameter ID Name CSFB GERAN EventB1 Trigger Threshold CsfbHoGeranB1Thd Source Setting Description Network Set this parameter based on the network plan plan. not required) Event B1 is triggered when the measured RSSI of a GERAN cell reaches the value of this parameter and all other conditions are also met. An appropriate value for this parameter reduces the probability of random events B1 and the average number of handovers. CSFB Geran EventB1 Time To Trig CsfbHoGeranTimeToTrig CSFB CsfbHoCdmaB1ThdPs CDMA2000 EventB1 Trigger Threshold Network Set this parameter based on the network plan plan. this parameter must be set. Instead. thereby eliminating unnecessary handovers. Ltd. it does not immediately send a measurement report to the eNodeB. 7-40 . because it is used by UEs as one of the conditions for triggering event B1. When CSFB to GERAN is required. 1: indicates an emergency call.eRAN CS Fallback 7 Engineering Guidelines Parameter Parameter ID Name CSFB CDMA EventB1 Time To Trig CsfbHoCdmaTimeToTrig Source Setting Description Network Set this parameter based on the network plan plan. 2: indicates that the target cell is a GERAN cell. 7-41 . this parameter must be set. When a UE detects that the signal quality in at least one CDMA2000 1xRTT cell meets the entering condition. Ltd. the UE sends a measurement report only when the signal quality has been meeting the entering condition throughout a period defined by this parameter. Instead. 0: indicates that the target cell is an E-UTRAN cell. 1: indicates that the SIB information of the target cell is included in the RRC Connection Release message. When CSFB to CDMA2000 is required. 7. because it is used by UEs as one of the conditions for triggering event B1. thereby eliminating unnecessary handovers. 1: indicates that the target cell is a UTRAN cell. This parameter specifies the (negotiation time-to-trigger for event B1 in CSFB to not required) CDMA2000 1xRTT.3 EBC Description Table 7-20 describes the event-based counters (EBCs) for CSFB.. ucTargetType Target Cell RAT Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Table 7-20 EBCs for CSFB Event Name Counter Name Counter Description Value PRIVATE_RRC_ ucRedirectionTrigger Indicator for CON_REL Redirection Trigger ucCSFBHighPriority Emergency Call Indicator ucSIBInfo Indicator for Including Target Cell SIB in RRC Connection Release Message 0: CSFB 1: others 0: indicates a non-emergency-call. An appropriate value for this parameter reduces the probability of random events B1 and the average number of handovers.10. it does not immediately send a measurement report to the eNodeB. 0: indicates that the SIB information of the target cell is not included in the RRC Connection Release message. Fault Handling Step 1 Create an S1 interface tracing task. 4: indicates a handover to TD-SCDMA. use the UE to camp on the E-UTRAN cell again. 1: indicates an emergency call. 1: indicates a distance-based handover.. 3: indicates a load-based handover. 3: indicates that the procedure fails due to NAS faults. 4: indicates that the procedure fails due to protocol-layer faults. ucHoTrigger Handover Trigger ucChoice Cause Category ucCauseValue Cause Value 23: S1_CS_FALLBACK ucCSFBHighPriority Indicator for Emergency Call-Triggered CSFB 0: indicates a non-emergency-call. 0: indicates that the procedure is complete. 5: indicates a handover to CDMA2000. 2: indicates an inter-frequency handover. 7-42 . Ltd. and check whether the value of the information element (IE) ePS-attach-type-value is Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. 2: indicates that the procedure fails due to transport-layer faults. 1: indicates that the procedure fails due to radio-network-layer faults.1 Fault 1 Fault Description A UE reselects an inter-RAT neighboring cell directly after initiating a voice call in an E-UTRAN cell. 6: indicates a handover to GERAN. 5: indicates that the procedure fails due to other faults. 7.eRAN CS Fallback 7 Engineering Guidelines Event Name Counter Name Counter Description Value Handover Type: Intra-Frequency/InterFrequency/Inter-RAT PRIVATE_INTER ucHoType _RAT_HO 1: indicates an intra-frequency handover. 3: indicates a handover to UTRAN. and the S1 interface tracing result shows that CSFB is not triggered.11 Troubleshooting 7.11. 0: indicates a reserved value. 2: indicates a coverage-based handover. go to Step 2. see Mobility Management in Connected Mode Feature Parameter Description. rectify the faults and try again. Fault Handling Step 1 Check whether the RRC Connection Reconfiguration message contains B1-related measurement configurations and whether the information about the inter-RAT systems in the configuration is correct. If it does. Fault Handling Step 1 Run the LST ENODEBALGOSWITCH command and check the setting of BlindHoSwitch under the Handover Mode switch parameter. go to Step 4. The core network supports CSFB. Step 2 Check whether the traced Attach Accept message includes the IE cs-domain-not-available.2 Fault 2 Fault Description An eNodeB delivers an RRC Connection Reconfiguration message to a UE that has initiated a voice call in the LTE network. In addition.eRAN CS Fallback 7 Engineering Guidelines "combined-attach" in the traced Attach Request message.3 Fault 3 Fault Description Even when blind handovers are configured as the preferred choice in the operator's policy. instead of triggering a blind handover for CSFB.11. an eNodeB delivers an inter-RAT measurement configuration to a UE that has initiated a voice call. contact Huawei technical support. check the CSFB mechanism and perform the following: If CSFB to UTRAN is required. If CSFB to GERAN is required. If not. go to Step 2. but the eNodeB does not receive a measurement report. go to Step 3. The SGs interface is correctly configured. go to Step 3. Step 3 Contact the vendors of core network NEs to ensure the following: Attach procedures to the CS domain are allowed according to the subscription data on the HSS. ----End 7. and try again. replace the UE with one that supports combined EPS/IMSI attach. For details about how to adjust B1-related parameters. If so. If CSFB to CDMA2000 1xRTT is required. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. If it is. ----End 7.. 7-43 . If BlindHoSwitch is Off. If not. run the MOD ENODEBALGOSWITCH command with the BlindHoSwitch(BlindHoSwitch) check box under the HoModeSwitch parameter selected. Ltd.11. go to Step 2. If the coverage is not good enough. Step 2 Check whether the coverage of the inter-RAT neighboring cell is good enough. If not. adjust B1-related parameters or use CSFB based on blind handovers. In this case. In this case. Table 7-21 Alarm list Alarm ID 29221 Alarm Name LTE-WCDMA Inter-System Outgoing Cell Handover Success Rate Too Low NetWork Element eNodeB Feature ID LOFD-001068 Feature Name CS Fallback with LAI to UTRAN 7. Ltd. If Blind handover priority is 0. If Blind handover priority is 0.5 CS Fallback with LAI to GERAN Table 7-22 shows the alarms related to the feature.. 7-44 .11. contact Huawei technical support. blind handovers to this cell are not allowed. If Blind handover priority is 0. contact Huawei technical support. Step 3 Run the LST GERANNCELL command and check whether Blind handover priority is 0 for a neighboring GERAN cell that is supposed to accept incoming blind handovers. In this case. If Blind handover priority is not 0.11.4 CS Fallback with LAI to UTRAN Table 7-21shows the alarms related to the feature. run the MOD GERANNCELL command with the Blind handover priority parameter set to a value other than 0. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. run the MOD CDMA20001XRTTNCELL command with the Blind handover priority parameter set to a value other than 0. Step 4 Run the LST CDMA20001XRTTNCELL command to check whether Blind handover priority is 0 for a neighboring CDMA2000 1xRTT cell that is supposed to accept incoming blind handovers. If Blind handover priority is not 0. If Blind handover priority is not 0.eRAN CS Fallback 7 Engineering Guidelines Step 2 Run the LST UTRANNCELL command and check whether Blind handover priority is 0 for a neighboring UTRAN cell that is supposed to accept incoming blind handovers. blind handovers to this cell are not allowed. ----End 7. blind handovers to this cell are not allowed. contact Huawei technical support. run the MOD UTRANNCELL command with the Blind handover priority parameter set to a value other than 0. Ltd.eRAN CS Fallback 7 Engineering Guidelines Table 7-22 Alarm list Alarm ID 29222 Alarm Name LTE-GERAN Inter-System Outgoing Cell Handover Success Rate Too Low NetWork Element eNodeB Feature ID LOFD-001069 Feature Name CS Fallback with LAI to GERAN Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.. 7-45 . 03 frequency-based LBFD-00201804 Service Based -handover Inter-frequency priority. The EUTRANINTER / Handover parameter FREQNCELL TDLBFD-002018 values are Selection and 02 divided into three LST Reselection value ranges. The value 0 indicates that blind handovers and frequency-priorit y-based handovers are not allowed. Ltd. and 0.eRAN CS Fallback 8 Parameters 8 Parameters Table 8-1 Parameter description MO Parameter ID MML Command Feature ID Feature Name Description EutranInterFreq BlindHoPriority NCell ADD LOFD-001032 / Intra-LTE Load Meaning:Indicat EUTRANINTER TDLOFD-00103 Balancing es the priority of FREQNCELL 2 the neighboring Coverage Based cell during MOD LBFD-00201802 Inter-frequency handovers. a larger value indicates a LBFD-00201805 higher priority. Values 1 to 16 are designated only for blind handovers. Values 17 to 32 are designated for frequency-priorit y-based handovers. 8-1 . In / TDLBFD-002018 Handover the same value 04 range. including frequency-priorit Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.. EUTRANINTER LBFD-00201803 Distance Based indicating the FREQNCELL / Inter-frequency blind-handover TDLBFD-002018 Handover priority. Blind handover is a process in which the eNodeB instructs a UE to hand over to a specified neighboring cell without measurements. There are 32 priorities altogether. Blind handover is a process in which the eNodeB instructs a UE to hand over to a specified neighboring cell. Note that the value 0 indicates that blind handovers to the neighboring cell are not allowed. 8-2 . GUI Value Range:0~32 Unit:None Actual Value Range:0~32 Default Value:0 UtranNCell BlindHoPriority ADD LBFD-002018 / Mobility UTRANNCELL TDLBFD-002018 Management MOD UTRANNCELL LST UTRANNCELL Meaning:Indicat es the priority of the neighboring cell during blind handovers. The priority has a positive correlation with the value of this parameter. Ltd..eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description y-based blind handovers and frequency-priorit y-based measurement-ba sed handovers. GUI Value Range:0~32 Unit:None Actual Value Range:0~32 Default Value:0 Cdma20001XRT BlindHoPriority ADD LOFD-002001 / Automatic Meaning:Indicat Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Blind CDMA20001XR TDLBFD-002018 Management handover is a TTNCELL process in which the eNodeB LST instructs a UE to CDMA20001XR hand over to a TTNCELL specified neighboring cell without measurements. . Note that the value 0 indicates that blind handovers to the neighboring cell are prohibited. Ltd. The priority has a Distance based 8-3 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Blind E-UTRAN and handover is a GERAN process in which Inter-RAT Load the eNodeB instructs a UE to Sharing to hand over to a GERAN specified Service based neighboring cell. There are 32 priorities altogether. inter-RAT There are 32 handover to priorities GERAN altogether.. GUI Value Range:0~32 Unit:None Actual Value Range:0~32 Default Value:0 GeranNcell BlindHoPriority ADD LBFD-002018 / Mobility GERANNCELL TDLBFD-002018 Management MOD LOFD-001020 / GERANNCELL TDLOFD-00102 0 LST GERANNCELL LOFD-001045 / TDLOFD-00104 5 LOFD-001046 / TDLOFD-00104 6 LOFD-001073 / TDLOFD-00107 Meaning:Indicat es the priority of the neighboring PS Inter-RAT cell during blind Mobility between handovers.eRAN CS Fallback 8 Parameters MO TNcell Parameter ID MML Command Feature ID Feature Name Description CDMA20001XR TDLOFD-00200 Neighbour es the priority of TTNCELL 1 Relation (ANR) the neighboring cell during blind MOD LBFD-002018 / Mobility handovers. The priority has a positive correlation with the value of this parameter. GUI Value Range:0~32 Unit:None Actual Value Range:0~32 Default Value:0 CSFallBackBlind CdmaLcsCap HoCfg LOFD-001035 CS Fallback to MOD CSFALLBACKB CDMA2000 LOFD-001047 / 1xRTT LINDHOCFG TDLOFD-00104 LST 7 LoCation CSFALLBACKB Services(LCS) LINDHOCFG Meaning:Indicat es the Location Services (LCS) capability of the CDMA2000. ON(On) Unit:None Actual Value Range:OFF. If this parameter is set to OFF. Ltd.eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID 3 Feature Name inter-RAT handover to GERAN Description positive correlation with the value of this parameter. the CDMA2000 supports LCS. If this parameter is set to ON. 8-4 . Note that the value 0 indicates that blind handovers to the neighboring cell are not allowed. GUI Value Range:OFF(Off). GUI Value Range:0~5 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.. ON Default Value:OFF(Off) CSFallBackBlind CnOperatorId HoCfg None LST CSFALLBACKB LINDHOCFG MOD CSFALLBACKB LINDHOCFG None Meaning:Indicat es the index of the operator. the CDMA20000 does not support LCS. 5~0. For details. step:0. GUI Value Range:-63~0 Unit:0.eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description Unit:None Actual Value Range:0~5 Default Value:None CSFallBackHo LOFD-001035 CsfbHoCdmaB1 MOD ThdPs CSFALLBACKH O LST CSFALLBACKH O CS Fallback to CDMA2000 1xRTT Meaning:Indicat es the pilot strength threshold related to event B1. see 3GPP TS 36. which is used in CS fallback to CDMA2000. When CS fallback to 8-5 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. . which is used in CS fallback to CDMA2000. Ltd.331.5dB Actual Value Range:-31..5 Default Value:-34 CSFallBackHo LOFD-001035 CsfbHoCdmaTi MOD meToTrig CSFALLBACKH O LST CSFALLBACKH O CS Fallback to CDMA2000 1xRTT Meaning:Indicat es the time-to-trigger for event B1. A UE sends a measurement report related to event B1 to the eNodeB when the pilot strength in at least one CDMA2000 cell exceeds this threshold and other triggering conditions are met. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.. see 3GPP TS 36. 64ms. 128ms. the UE sends a report only when the signal quality continuously meets the entering condition during the time-to-trigger. Ltd. When detecting that the signal quality in at least one CDMA2000 cell meets the entering condition. For details. Instead.331. this parameter is set for UEs and used in the evaluation of whether to trigger event B1.eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description CDMA2000 is applicable. 80ms. and the number of wrong handovers. 40ms. and hence helps prevent unnecessary handovers. 160ms. GUI Value Range:0ms. 100ms. This parameter helps reduce the number of occasionally triggered event reports. the average number of handovers. the UE does not send a measurement report to the eNodeB immediately. 8-6 . 1280ms. For details. 2560ms. 80ms. 40ms. 1024ms. 5120ms Unit:ms Actual Value Range:0ms. 5120ms Default Value:40ms CSFallBackHo CsfbHoGeranB1 MOD LOFD-001034 / CS Fall Back to Meaning:Indicat Thd CSFALLBACKH TDLOFD-00103 GERAN es the RSSI O 4 threshold for event B1 that is LST used in CS CSFALLBACKH fallback to O GERAN. 480ms. 512ms. 1280ms.331. 160ms.. 8-7 . 256ms. 2560ms. 64ms. 320ms. A UE sends a measurement report related to event B1 to the eNodeB when the RSSI in at least one GERAN cell exceeds this threshold and other triggering conditions are met. 100ms. 480ms. 128ms. 1024ms.eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description 256ms. 320ms. 512ms. 640ms. GUI Value Range:-110~-48 Unit:dBm Actual Value Range:-110~-48 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. 640ms. see 3GPP TS 36. Ltd. Instead. the average number of handovers. 8-8 . Ltd.. This parameter helps decrease the number of occasionally triggered event reports. and the number of wrong handovers. this parameter is set for UEs and used in the evaluation of whether to trigger event B1. the UE does not send a measurement report to the eNodeB immediately. When detecting that the signal quality in at least one GERAN cell meets the entering condition. and thus helps Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. When CS fallback to GERAN is applicable. the UE sends a report only when the signal quality continuously meets the entering condition during the time-to-trigger.eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description Default Value:-103 CSFallBackHo CsfbHoGeranTi MOD LOFD-001034 / CS Fall Back to Meaning:Indicat meToTrig CSFALLBACKH TDLOFD-00103 GERAN es the O 4 time-to-trigger for event B1 that LST is used in CS CSFALLBACKH fallback to O GERAN. For details. 64ms. this parameter is set for UEs and used in the evaluation about whether to trigger event B1. 640ms. When CS fallback to UTRAN is required. 100ms. 1024ms. 100ms. 320ms. 2560ms. 2560ms. 5120ms Default Value:40ms CSFallBackHo CsfbHoUtranB1 MOD LOFD-001033 / CS Fallback to ThdEcn0 CSFALLBACKH TDLOFD-00103 UTRAN O 3 LST CSFALLBACKH O Meaning:Indicat es the Ec/No threshold for event B1. 80ms. 8-9 . which is used in CS fallback to UTRAN. 256ms. 480ms. 128ms. 256ms. 480ms. 160ms. 80ms. 5120ms Unit:ms Actual Value Range:0ms.eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description prevent unnecessary handovers. 512ms. GUI Value Range:0ms. 320ms. 1024ms.. This parameter indicates the Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. 160ms. 128ms. Ltd. 1280ms. 40ms. 40ms. 64ms. 640ms. 1280ms.331. see 3GPP TS 36. 512ms. eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description Ec/No requirement for the UTRAN cells to be included in the measurement report. A UE sends a measurement report related to event B1 to the eNodeB when the Ec/No in at least one UTRAN cell exceeds this threshold and other triggering conditions are met. For a cell with large signal fading variance, set this parameter to a large value to prevent unnecessary handovers. For a cell with small signal fading variance, set this parameter to a small value to ensure timely handovers. For details, see 3GPP TS 36.331. GUI Value Range:-48~0 Unit:0.5dB Actual Value Range:-24~0, step:0.5 Default Value:-13 CSFallBackHo CsfbHoUtranB1 MOD LOFD-001033 / CS Fallback to ThdRscp CSFALLBACKH TDLOFD-00103 UTRAN O 3 Meaning:Indicat es the RSCP threshold for Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 8-10 eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID LST CSFALLBACKH O Feature Name Description event B1, which is used in CS fallback to UTRAN. When CS fallback to UTRAN is applicable, this parameter is set for UEs and used in the evaluation about whether to trigger event B1. This parameter indicates the RSCP requirement for the UTRAN cells to be included in the measurement report. A UE sends a measurement report related to event B1 to the eNodeB when the RSCP in at least one UTRAN cell exceeds this threshold and other triggering conditions are met. For details, see 3GPP TS 36.331. GUI Value Range:-120~-25 Unit:dBm Actual Value Range:-120~-25 Default Value:-106 CSFallBackHo CsfbHoUtranTim MOD LOFD-001033 / CS Fallback to eToTrig CSFALLBACKH TDLOFD-00103 UTRAN O 3 LST CSFALLBACKH Meaning:Indicat es the time-to-trigger for event B1 that is used in CS Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 8-11 eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID O Feature Name Description fallback to UTRAN. When CS fallback to UTRAN is applicable, this parameter is set for UEs and used in the evaluation of whether to trigger event B1. When detecting that the signal quality in at least one UTRAN cell meets the entering condition, the UE does not send a measurement report to the eNodeB immediately. Instead, the UE sends a report only when the signal quality continuously meets the entering condition during the time-to-trigger. This parameter helps decrease the number of occasionally triggered event reports, the average number of handovers, and the number of wrong handovers, and thus helps prevent unnecessary handovers. For details, see 3GPP TS 36.331. GUI Value Range:0ms, Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 8-12 1280ms. 64ms. 256ms. the high CS-priority Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. 100ms. 512ms. 8-13 . 80ms. 64ms. the priority for the neighboring UTRAN frequency to carry CS services. 160ms. When UtranFreqLayer MeasSwitch is turned on: If there are both high and low CS-priority UTRAN frequencies. 128ms. 5120ms Default Value:40ms UtranNFreq CsPriority ADD LOFD-001033 / CS Fallback to UTRANNFREQ TDLOFD-00103 UTRAN 3 MOD E-UTRAN to UTRANNFREQ LOFD-001078 / UTRAN CS/PS TDLBFD-001078 Steering LST UTRANNFREQ Meaning:Indicat es the circuit switched (CS) priority of the neighboring UTRAN frequency. 480ms. 100ms. 256ms. that is. 640ms. 80ms. It is used in CSFB-triggered handovers.. 512ms. 1024ms. 2560ms. 5120ms Unit:ms Actual Value Range:0ms. 480ms. 320ms. 160ms. 2560ms. 640ms. 1024ms. 320ms. 40ms. 1280ms. Ltd.eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description 40ms. 128ms. if there are only low CS-priority UTRAN frequencies. 8-14 .. the target cell is selected from all neighboring UTRAN cells.eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description UTRAN frequencies are preferentially measured. GUI Value Range:LOW_PR IORITY(Low Priority). the target cell for a blind handover is preferentially selected from the neighboring UTRAN cells on high CS-priority frequencies. HIGH_PRIORIT Y(High Priority) Unit:None Actual Value Range:LOW_PR IORITY. these low CS-priority UTRAN frequencies are measured. Ltd. If all neighboring UTRAN cells are on low CS-priority frequencies. If UtranFreqLayer BlindSwitch is turned on. HIGH_PRIORIT Y Default Value:HIGH_PRI ORITY(High Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. GUI Value Range:UtranFre qLayerMeasSwit ch(UtranFreqLay erMeasSwitch).eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description Priority) ENodeBAlgoSwi FreqLayerSwtich MOD LOFD-001078 / E-UTRAN to Meaning:Indicat tch ENODEBALGO TDLOFD-00107 UTRAN CS/PS es the switch SWITCH 8 Steering used to enable or disable the LST UTRAN ENODEBALGO hierarchy-based SWITCH measurement algorithm and the UTRAN hierarchy-based blind-handover algorithm. 8-15 .If UtranFreqLayer MeasSwitch is turned on. the UTRAN hierarchy-based measurement algorithm takes effect for measurements related to coverage-based and CSFB-triggered handovers from the E-UTRAN to the UTRAN. Ltd. the UTRAN hierarchy-based blind-handover algorithm takes effect for coverage-based and CSFB-triggered handovers from the E-UTRAN to the UTRAN. If UtranFreqLayer BlindSwitch is turned on.. UtranFreqLayer BlindSwitch(Utra Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description nFreqLayerBlind Switch) Unit:None Actual Value Range:UtranFre qLayerMeasSwit ch. GUI Value Range:OFF(Off). If this parameter is set to OFF. the GERAN does not support LCS. ON Default Value:OFF(Off) ENodeBAlgoSwi HoAlgoSwitch tch MOD LBFD-00201801 Coverage Based Meaning:Indicat ENODEBALGO / Intra-frequency es the collective SWITCH TDLBFD-002018 Handover switch used to 01 enable or disable LST Coverage Based handover. ENODEBALGO LBFD-00201802 Inter-frequency SWITCH / Handover Flash CS TDLBFD-002018 fallback to Service based UTRAN: If the 02 inter-RAT switch for CS LOFD-001043 / handover to Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. UtranFreqLayer BlindSwitch:Off CSFallBackBlind GeranLcsCap HoCfg MOD LOFD-001034 / CS Fallback to CSFALLBACKB TDLOFD-00103 GERAN LINDHOCFG 4 LoCation LST LOFD-001047 / Services(LCS) CSFALLBACKB TDLOFD-00104 LINDHOCFG 7 Meaning:Indicat es the Location Services (LCS) capability of the GERAN. If this parameter is set to ON. Ltd. ON(On) Unit:None Actual Value Range:OFF. UtranFreqLayer BlindSwitch Default Value:UtranFreq LayerMeasSwitc h:Off. the GERAN supports LCS.. 8-16 Issue 04 (2012-09-20) . GUI Value Range:IntraFreq CoverHoSwitch(I ntraFreqCoverH oSwitch). GeranServiceHo Switch(GeranSe rviceHoSwitch).. GeranCsfbSwitc h(GeranCsfbSwi tch). Flash CS fallback to GERAN: If the switch for CS fallback to GERAN is turned off. 8-17 .eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description fallback to UTRAN is turned off. UtranServiceHo Switch(UtranSer viceHoSwitch). Ltd. CdmaHrpdServi ceHoSwitch(Cd ma2000HrpdSer viceHoSwitch). UlQualityInterRA THoSwitch(UlQu alityInterRATHo Switch). InterFreqCoverH oSwitch(InterFre qCoverHoSwitch ). UtranCsfbSwitch (UtranCsfbSwitc h). Cdma1xRttCsfb Switch(Cdma20 001xRttCsfbSwit ch). this switch does not take effect. Cdma1xRttServi ceHoSwitch(Cd ma20001xRttSer viceHoSwitch). this switch does not take effect. InterPlmnHoSwit TDLOFD-00104 UTRAN 3 Service based LOFD-001046 / inter-RAT TDLOFD-00104 handover to 6 GERAN LBFD-00201805 Service Based / Inter-frequency TDLBFD-002018 Handover 05 CS Fallback to LOFD-001033 / UTRAN TDLOFD-00103 CS Fallback to 3 GERAN LOFD-001034 / TDLOFD-00103 CS Fallback to CDMA2000 4 1xRTT LOFD-001035 / TDLOFD-00103 Flash CS Fallback to 5 UTRAN LOFD-001052 / TDLOFD-00105 Flash CS Fallback to 2 GERAN LOFD-001053 / TDLOFD-00105 3 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. ServiceBasedInt erFreqHoSwitch( ServiceBasedInt erFreqHoSwitch) . Cdma1xRttServi ceHoSwitch. GeranCsfbSwitc h. ServiceBasedInt erFreqHoSwitch. 8-18 . GeranFlashCsfb Switch(GeranFla shCsfbSwitch). UlQualityInterFre qHoSwitch Default Value:IntraFreqC Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. GeranServiceHo Switch. UtranServiceHo Switch. InterFreqCoverH oSwitch. UtranFlashCsfb Switch(UtranFla shCsfbSwitch). UlQualityInterRA THoSwitch. UtranCsfbSwitch . Cdma1xRttCsfb Switch. InterPlmnHoSwit ch. UlQualityInterFre qHoSwitch(UlQu alityInterFreqHo Switch) Unit:None Actual Value Range:IntraFreq CoverHoSwitch.eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description ch(InterPlmnHo Switch). CdmaHrpdServi ceHoSwitch.. Ltd. UtranFlashCsfb Switch. GeranFlashCsfb Switch. Note TDLOFD-00102 that 1 PS Inter-RAT Mobility between EutranVoipCapS LOFD-001022 / E-UTRAN and witch will be TDLOFD-00102 CDMA2000 removed in the 2 later versions. UtranFlashCsfb Switch:Off. GeranFlashCsfb Switch:Off. the LOFD-001023 / UTRAN setting of this TDLOFD-00102 switch is still 3 SRVCC to synchronized GERAN between the Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. InterPlmnHoSwit ch:Off.eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description overHoSwitch:O n. GeranCsfbSwitc h:Off. Ltd. UtranServiceHo Switch:Off. UtranCsfbSwitch :Off. ServiceBasedInt erFreqHoSwitch: Off. Cdma2000Hrpd ServiceHoSwitch :Off. GeranServiceHo Switch:Off. In SRVCC to this version. InterFreqCoverH oSwitch:On. 8-19 .. Cdma20001xRtt CsfbSwitch:Off. Cdma20001xRtt ServiceHoSwitch :Off. UlQualityInterRA THoSwitch:Off. UlQualityInterFre qHoSwitch:Off ENodeBAlgoSwi HoModeSwitch MOD LOFD-001019 / PS Inter-RAT Meaning:Indicat tch ENODEBALGO TDLOFD-00101 Mobility between es the switches SWITCH 9 E-UTRAN and corresponding to UTRAN the inputs based LST LOFD-001020 / on which the ENODEBALGO TDLOFD-00102 PS Inter-RAT eNodeB SWITCH 0 Mobility between determines E-UTRAN and handover LOFD-001021 / GERAN policies. Therefore. UtranPsHoSwitc h(UtranPsHoSwi tch). CdmaHrpdNonO tpimisedHoSwitc h(CdmaHrpdNon OtpimisedHoSwi tch). CdmaHrpdOptim isedHoSwitch(C dmaHrpdOptimis edHoSwitch). GeranVoipCapS witch(GeranVoip CapSwitch). Cdma1xRttSrvcc Switch(Cdma1x RttSrvccSwitch). Cdma1xRttVoip CapSwitch(Cdm a1xRttVoipCapS witch). UtranRedirectSw itch(UtranRedire Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. UtranSrvccSwitc h(UtranSrvccSwi tch). GUI Value Range:EutranVoi pCapSwitch(Eutr anVoipCapSwitc h).. GeranCcoSwitch (GeranCcoSwitc h). UtranVoipCapS witch(UtranVoip CapSwitch). GeranNaccSwitc h(GeranNaccSwi tch).eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description M2000 and the eNodeB. Ltd. but it is no longer used internally. GeranPsHoSwit ch(GeranPsHoS witch). avoid using this switch. GeranSrvccSwit ch(GeranSrvccS witch). 8-20 . Cdma1xRttRedir ectSwitch(Cdma 1xRttRedirectSw itch).eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description ctSwitch). CdmaHrpdRedir ectSwitch(Cdma HrpdRedirectSwi tch). GeranVoipCapS witch. UtranSrvccSwitc h.. UtranPsHoSwitc h. GeranNaccSwitc h. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. UtranRedirectSw itch. 8-21 . UtranVoipCapS witch. Cdma1xRttVoip CapSwitch. CdmaHrpdNonO tpimisedHoSwitc h. Ltd. CdmaHrpdRedir ectSwitch. GeranPsHoSwit ch. GeranCcoSwitch . Cdma1xRttSrvcc Switch. GeranRedirectS witch. Cdma1xRttRedir ectSwitch. BlindHoSwitch(B lindHoSwitch) Unit:None Actual Value Range:EutranVoi pCapSwitch. GeranSrvccSwit ch. CdmaHrpdOptim isedHoSwitch. GeranRedirectS witch(GeranRedi rectSwitch). GeranSrvccSwit ch:Off. Cdma1xRttRedir ectSwitch:Off. LINDHOCFG 0 Mobility between It is UTRAN by E-UTRAN and default. GeranCcoSwitch :Off. CdmaHrpdRedir ectSwitch:Off.. GeranRedirectS witch:Off. Cdma1xRttVoip CapSwitch:Off. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. GeranPsHoSwit ch:Off.eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description BlindHoSwitch Default Value:EutranVoi pCapSwitch:On. This LOFD-001021 / GERAN parameter can TDLOFD-00102 be set to 1 PS Inter-RAT Mobility between UTRAN. Ltd. 8-22 . UtranPsHoSwitc h:Off. CdmaHrpdOptim isedHoSwitch:Of f. CdmaHrpdNonO tpimisedHoSwitc h:Off. BlindHoSwitch:O ff CSFallBackBlind InterRatHighest MOD LOFD-001019 / PS Inter-RAT Meaning:Ndicate HoCfg Pri CSFALLBACKB TDLOFD-00101 Mobility between s the LINDHOCFG 9 E-UTRAN and high-priority UTRAN system to be LST LOFD-001020 / considered in CSFALLBACKB TDLOFD-00102 PS Inter-RAT blind handovers. UtranVoipCapS witch:Off. GeranNaccSwitc h:Off. UtranSrvccSwitc h:Off. Cdma1xRttSrvcc Switch:Off. UtranRedirectSw itch:Off. GeranVoipCapS witch:Off. 8-23 . If 4 this parameter is Inter-RAT Load set to NULL. 4 Inter-RAT Load GUI Value LOFD-001045 / Sharing to Range:UTRAN.eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description LOFD-001044 / E-UTRAN and GERAN. or TDLOFD-00104 CDMA2000 CDMA2000. TDLOFD-00104 UTRAN GERAN. LINDHOCFG 0 Mobility between It is CDMA2000 E-UTRAN and by default. Ltd. LOFD-001034 / UTRAN GERAN. TDLOFD-00103 CDMA2000 CS Fallback to 4 GERAN Default LOFD-001035 / Value:UTRAN TDLOFD-00103 CS Fallback to CDMA2000 5 1xRTT LOFD-001068 / TDLOFD-00106 CS Fallback with LAI to UTRAN 8 LOFD-001069 / CS Fallback with TDLOFD-00106 LAI to GERAN 9 Flash CS LOFD-001052 / Fallback to TDLOFD-00105 UTRAN 2 Flash CS LOFD-001053 / Fallback to TDLOFD-00105 GERAN 3 CSFallBackBlind InterRatLowestP MOD LOFD-001019 / PS Inter-RAT Meaning:Indicat HoCfg ri CSFALLBACKB TDLOFD-00101 Mobility between es the LINDHOCFG 9 E-UTRAN and low-priority UTRAN system to be LST LOFD-001020 / considered in CSFALLBACKB TDLOFD-00102 PS Inter-RAT blind handovers. This LOFD-001021 / GERAN parameter can TDLOFD-00102 be set to 1 PS Inter-RAT Mobility between UTRAN. 5 CDMA2000 Inter-RAT Load LOFD-001033 / Sharing to Unit:None TDLOFD-00103 GERAN Actual Value 3 CS Fallback to Range:UTRAN.. LOFD-001044 / E-UTRAN and GERAN. the LOFD-001045 / Sharing to system with the TDLOFD-00104 UTRAN medium blind 5 handover priority Inter-RAT Load is not specified LOFD-001033 / Sharing to and only blind Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. or TDLOFD-00104 CDMA2000 CDMA2000. TDLOFD-00103 CS Fallback to GERAN. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.and CS Fallback to medium-priority LOFD-001034 / UTRAN systems are TDLOFD-00103 CS Fallback to applicable. 9 Flash CS CDMA2000. the LOFD-001045 / Sharing to system with the TDLOFD-00104 UTRAN medium blind 5 handover priority Inter-RAT Load is not specified LOFD-001033 / Sharing to and only blind TDLOFD-00103 GERAN handovers to the 3 CS Fallback to high-priority LOFD-001034 / UTRAN system are TDLOFD-00103 applicable. LOFD-001044 / E-UTRAN and GERAN. TDLOFD-00106 LAI to GERAN GERAN. 4 CS Fallback to GUI Value GERAN LOFD-001035 / Range:UTRAN. LINDHOCFG 0 Mobility between It is GERAN by E-UTRAN and default. CDMA2000 5 CDMA2000. This LOFD-001021 / GERAN parameter can TDLOFD-00102 be set to 1 PS Inter-RAT Mobility between UTRAN. Ltd. 8-24 . Fallback to NULL LOFD-001052 / UTRAN TDLOFD-00105 Default 2 Flash CS Value:CDMA200 Fallback to 0 LOFD-001053 / GERAN TDLOFD-00105 3 CSFallBackBlind InterRatSecond MOD LOFD-001019 / PS Inter-RAT Meaning:Indicat HoCfg Pri CSFALLBACKB TDLOFD-00101 Mobility between es the LINDHOCFG 9 E-UTRAN and medium-priority UTRAN system to be LST LOFD-001020 / considered in CSFALLBACKB TDLOFD-00102 PS Inter-RAT blind handovers.eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description TDLOFD-00103 GERAN handovers to the 3 high. 1xRTT NULL LOFD-001068 / CS Fallback with TDLOFD-00106 LAI to UTRAN Unit:None 8 Actual Value LOFD-001069 / CS Fallback with Range:UTRAN. or TDLOFD-00104 CDMA2000 CDMA2000. If 4 this parameter is Inter-RAT Load set to NULL. 4 GERAN GUI Value LOFD-001035 / Range:UTRAN.. TDLOFD-00103 CS Fallback to GERAN. 8-25 .eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID 5 Feature Name CDMA2000 1xRTT Description CDMA2000. It uniquely identifies a cell within a BS. Ltd. UTRAN MOD GUI Value UTRANEXTERN Range:0~255 ALCELL Unit:None LST Actual Value UTRANEXTERN Range:0~255 ALCELL Default Value:0 GeranExternalC Rac ell ADD LOFD-001020 / PS Inter-RAT Meaning:Indicat GERANEXTER TDLOFD-00102 Mobility between es the routing NALCELL 0 E-UTRAN and area code. NULL LOFD-001068 / TDLOFD-00106 CS Fallback with Unit:None 8 LAI to UTRAN Actual Value LOFD-001069 / CS Fallback with Range:UTRAN. TDLOFD-00106 LAI to GERAN GERAN. GUI Value Range:0~17 Unit:None Actual Value Range:0~17 Default Value:None UtranExternalCe Rac ll ADD LOFD-001019 / PS Inter-RAT Meaning:Indicat UTRANEXTERN TDLOFD-00101 Mobility between es the routing ALCELL 9 E-UTRAN and area code. Flash CS NULL LOFD-001052 / Fallback to TDLOFD-00105 UTRAN Default 2 Value:GERAN Flash CS LOFD-001053 / Fallback to TDLOFD-00105 GERAN 3 CSFallBackHo LocalCellId LST LBFD-001001 / 3GPP R8 CSFALLBACKH TDLBFD-001001 Specifications O MOD CSFALLBACKH O Meaning:Indicat es the local ID of the cell.. 9 CDMA2000. GERAN MOD GUI Value GERANEXTER Range:0~255 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. the eNodeB cannot send RAN-INFORMA TION-REQUEST PDUs to UTRAN cells to request multiple event-driven reports. 8-26 . If this switch is turned on. If this switch is turned off. Ltd.eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID NALCELL LST GERANEXTER NALCELL Feature Name Description Unit:None Actual Value Range:0~255 Default Value:0 Meaning:Indicat es the collective switch for the RAN information management (RIM) function.. GERAN_RIM_S WITCH: Indicates the ENodeBAlgoSwi RimSwitch tch MOD LOFD-001052 / Flash CS ENODEBALGO TDLOFD-00105 Fallback to SWITCH 2 UTRAN LST LOFD-001053 / Flash CS ENODEBALGO TDLOFD-00105 Fallback to SWITCH 3 GERAN Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. the eNodeB can send RAN-INFORMA TION-REQUEST protocol data units (PDUs) to UTRAN cells to request multiple event-driven reports. UTRAN_RIM_S WITCH: Indicates the switch used to enable or disable the RIM procedure that requests event-driven multiple reports from UTRAN cells. If this switch is turned off. GERAN RIM Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. 8-27 . the eNodeB can send RAN-INFORMA TION-REQUEST PDUs to CERAN cells to request multiple event-driven reports. the eNodeB cannot send RAN-INFORMA TION-REQUEST PDUs to GERAN cells to request multiple event-driven reports. GUI Value Range:UTRAN_ RIM_SWITCH(U TRAN RIM Switch). Ltd. GERAN_RIM_S WITCH(GERAN RIM Switch) Unit:None Actual Value Range:UTRAN_ RIM_SWITCH. GERAN_RIM_S WITCH Default Value:UTRAN RIM Switch:Off. If this switch is turned on..eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description switch used to enable or disable the RIM procedure that requests event-driven multiple reports from GERAN cells. GUI Value Range:OFF(Off). Ltd. ON Default Value:OFF(Off) Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. the UTRAN supports LCS.. 8-28 .eRAN CS Fallback 8 Parameters MO Parameter ID MML Command Feature ID Feature Name Description Switch:Off CSFallBackBlind UtranLcsCap HoCfg MOD LOFD-001033 / CS Fallback to CSFALLBACKB TDLOFD-00103 UTRAN LINDHOCFG 3 LoCation LST LOFD-001047 / Services(LCS) CSFALLBACKB TDLOFD-00104 LINDHOCFG 7 Meaning:Indicat es the Location Services (LCS) capability of the UTRAN. the UTRAN does not support LCS. If this parameter is set to OFF. ON(On) Unit:None Actual Value Range:OFF. If this parameter is set to ON. E2W.IRATHO..eRAN CS Fallback 9 Counters 9 Counters Table 9-1 Counter description Counter ID Counter Name Counter Descriptio Feature ID n LOFD-001021 LOFD-001035 Feature Name 1526726988 L.Exe Number of cSuccOut Successful LOFD-001019 PS Inter-RAT Mobility between Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Ltd. 9-1 .IRATHO.E2C.Pre Number of Outgoing LOFD-001019 pAttOut Handover Attempts from E-UTRAN to LOFD-001022 UTRAN LOFD-001033 TDLOFD-001019 TDLOFD-001022 TDLOFD-001033 1526726990 LOFD-001019 L.IRATHO.Exe Number of cSuccOut Successful Outgoing Handovers from E-UTRAN to CDMA2000 PS Inter-RAT Mobility between E-UTRAN and CDMA2000 CS Fallback to CDMA2000 1xRTT PS Inter-RAT Mobility between E-UTRAN and UTRAN SRVCC to UTRAN CS Fallback to UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN SRVCC to UTRAN CS Fallback to UTRAN 1526726989 L.E2W.Exe Number of cAttOut Performed Outgoing LOFD-001022 Handovers from E-UTRAN to LOFD-001033 UTRAN TDLOFD-001019 TDLOFD-001022 TDLOFD-001033 PS Inter-RAT Mobility between E-UTRAN and UTRAN SRVCC to UTRAN CS Fallback to UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN SRVCC to UTRAN CS Fallback to UTRAN 1526726991 L.E2W.IRATHO. 9-2 . Ltd.Prep Number of Outgoing LOFD-001020 AttOut Handover Attempts from E-UTRAN to LOFD-001023 GERAN LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034 PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN 1526726993 LOFD-001020 L.E2G.Exe Number of cAttOut Performed Outgoing LOFD-001023 Handovers from E-UTRAN to LOFD-001034 GERAN TDLOFD-001020 TDLOFD-001023 TDLOFD-001034 PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co..eRAN CS Fallback 9 Counters Counter ID Counter Name Counter Descriptio Feature ID n Outgoing Handovers from E-UTRAN to UTRAN LOFD-001022 LOFD-001033 TDLOFD-001019 TDLOFD-001022 TDLOFD-001033 Feature Name E-UTRAN and UTRAN SRVCC to UTRAN CS Fallback to UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN SRVCC to UTRAN CS Fallback to UTRAN 1526726992 L.E2G.IRATHO.IRATHO. eRAN CS Fallback 9 Counters Counter ID Counter Name Counter Descriptio Feature ID n Feature Name GERAN 1526726994 L.IRATHO.E2G.Exe Number of cSuccOut Successful Outgoing Handovers from E-UTRAN to GERAN LOFD-001020 LOFD-001023 LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034 PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN 1526727033 Handover from E-UTRAN to CDMA2000 Success Rate LOFD-001021 Success rate of inter-RAT handovers from E-UTRAN to LOFD-001035 CDMA2000 network PS Inter-RAT Mobility between E-UTRAN and CDMA2000 CS Fallback to CDMA2000 1xRTT 1526727034 Handover from E-UTRAN to WCDMA Success Rate LOFD-001019 Success rate of inter-RAT handovers from E-UTRAN to LOFD-001022 WCDMA network LOFD-001033 TDLOFD-001019 TDLOFD-001022 TDLOFD-001033 PS Inter-RAT Mobility between E-UTRAN and UTRAN SRVCC to UTRAN CS Fallback to UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN SRVCC to UTRAN CS Fallback to UTRAN 1526728306 L.IRATHO.E2G.Prep Number of outgoing LOFD-001034 .FailOut.MME handover preparation failures TDLOFD-001034 from E-UTRAN to CS Fallback to GERAN CS Fallback to Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 9-3 eRAN CS Fallback 9 Counters Counter ID Counter Name Counter Descriptio Feature ID n GERAN due to faults in the EPC LOFD-001020 TDLOFD-001020 LOFD-001046 TDLOFD-001046 LOFD-001073 Feature Name GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN Service based inter-RAT handover to GERAN Service based inter-RAT handover to GERAN Distance based inter-RAT handover to GERAN 1526728307 L.IRATHO.E2G.Prep Number of outgoing LOFD-001034 .FailOut.NoReply handover preparation failures TDLOFD-001034 due to no responses LOFD-001020 from GERAN TDLOFD-001020 LOFD-001046 TDLOFD-001046 LOFD-001073 CS Fallback to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN Service based inter-RAT handover to GERAN Service based inter-RAT handover to GERAN Distance based inter-RAT handover to GERAN 1526728308 L.IRATHO.E2G.Prep Number of outgoing LOFD-001034 .FailOut.PrepFailure handover preparation failures TDLOFD-001034 CS Fallback to GERAN CS Fallback to 9-4 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. eRAN CS Fallback 9 Counters Counter ID Counter Name Counter Descriptio Feature ID n due to handover LOFD-001020 preparation failures TDLOFD-001020 in GERAN LOFD-001046 TDLOFD-001046 LOFD-001073 Feature Name GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN Service based inter-RAT handover to GERAN Service based inter-RAT handover to GERAN Distance based inter-RAT handover to GERAN 1526728309 L.IRATHO.E2T.Prep Number of outgoing LOFD-001033 .FailOut.MME handover preparation failures TDLOFD-001033 from E-UTRAN to LOFD-001019 TD-SCDMA network due to faults in the TDLOFD-001019 EPC LOFD-001043 TDLOFD-001043 LOFD-001072 CS Fallback to UTRAN CS Fallback to UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN Service based inter-RAT handover to UTRAN Service based inter-RAT handover to UTRAN Distance based inter-RAT handover to UTRAN 1526728310 L.IRATHO.E2T.Prep Number of outgoing LOFD-001033 .FailOut.NoReply handover preparation failures TDLOFD-001033 CS Fallback to UTRAN CS Fallback to 9-5 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. eRAN CS Fallback 9 Counters Counter ID Counter Name Counter Descriptio Feature ID n due to no responses LOFD-001019 from TD-SCDMA TDLOFD-001019 network LOFD-001043 TDLOFD-001043 LOFD-001072 Feature Name UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN Service based inter-RAT handover to UTRAN Service based inter-RAT handover to UTRAN Distance based inter-RAT handover to UTRAN 1526728311 L.Prep Number of outgoing .FailOut.IRATHO. ..BlindHO. Ltd.E2T.IRATHO. Number of E2W.ExecAttOut performed outgoing TDLOFD-001033 blind handovers CS Fallback to UTRAN CS Fallback to 9-6 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.PrepFailure handover preparation failures due to handover preparation failures in TD-SCDMA network LOFD-001033 TDLOFD-001033 LOFD-001019 TDLOFD-001019 LOFD-001043 TDLOFD-001043 LOFD-001072 CS Fallback to UTRAN CS Fallback to UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN Service based inter-RAT handover to UTRAN Service based inter-RAT handover to UTRAN Distance based inter-RAT handover to UTRAN 1526728312 LOFD-001033 L. 9-7 .ExecAttOut performed outgoing TDLOFD-001034 blind handovers from E-UTRAN to LOFD-001020 TDLOFD-001020 CS Fallback to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN GERAN 1526728315 LOFD-001034 L.BlindHO.ExecSuccOut successful outgoing TDLOFD-001034 blind handovers from E-UTRAN to LOFD-001020 GERAN TDLOFD-001020 CS Fallback to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Number of E2G.ExecSuccOut performed outgoing TDLOFD-001033 blind handovers from E-UTRAN to LOFD-001019 TDLOFD-001019 CS Fallback to UTRAN CS Fallback to UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN WCDMA network 1526728314 LOFD-001034 L. Number of E2W..BlindHO.IRATHO.eRAN CS Fallback 9 Counters Counter ID Counter Name Counter Descriptio Feature ID n from E-UTRAN to LOFD-001019 TDLOFD-001019 Feature Name UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN WCDMA network 1526728313 LOFD-001033 L.BlindHO. Number of E2G.IRATHO.IRATHO. Ltd. PrepFailur handover e preparation failures due to handover preparation failures in WCDMA network LOFD-001033 TDLOFD-001033 LOFD-001019 TDLOFD-001019 LOFD-001043 TDLOFD-001043 LOFD-001072 CS Fallback to UTRAN CS Fallback to UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN Service based inter-RAT handover to UTRAN Service based inter-RAT handover Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.Pre Number of outgoing p.IRATHO.FailOut.eRAN CS Fallback 9 Counters Counter ID Counter Name Counter Descriptio Feature ID n Feature Name PS Inter-RAT Mobility between E-UTRAN and GERAN 1526728316 L..IRATHO.Pre Number of outgoing p.E2W.FailOut.E2W.MME handover preparation failures from E-UTRAN to WCDMA network due to faults in the EPC LOFD-001033 TDLOFD-001033 LOFD-001019 TDLOFD-001019 LOFD-001043 TDLOFD-001043 LOFD-001072 CS Fallback to UTRAN CS Fallback to UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN Service based inter-RAT handover to UTRAN Service based inter-RAT handover to UTRAN Distance based inter-RAT handover to UTRAN 1526728317 L. 9-8 . Ltd. PrepAtt Number of CS fallback indicators received by the eNodeB LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034 LOFD-001035 CS Fallback to UTRAN CS Fallback to UTRAN CS Fallback to GERAN CS Fallback to GERAN CS Fallback to CDMA2000 1xRTT 1526728322 L.Pre Number of outgoing LOFD-001033 p.CSFB.E2W. 9-9 .eRAN CS Fallback 9 Counters Counter ID Counter Name Counter Descriptio Feature ID n Feature Name to UTRAN Distance based inter-RAT handover to UTRAN 1526728318 L.PrepSucc LOFD-001033 Number of successful CS fallback responses TDLOFD-001033 from the eNodeB LOFD-001034 CS Fallback to UTRAN CS Fallback to UTRAN CS Fallback to Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.CSFB..IRATHO. Ltd.NoReply handover preparation failures TDLOFD-001033 due to no responses LOFD-001019 from WCDMA TDLOFD-001019 network LOFD-001043 TDLOFD-001043 LOFD-001072 CS Fallback to UTRAN CS Fallback to UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN Service based inter-RAT handover to UTRAN Service based inter-RAT handover to UTRAN Distance based inter-RAT handover to UTRAN 1526728321 L.FailOut. CSFB.E Number of 2W redirections to WCDMA network LOFD-001033 TDLOFD-001033 LOFD-001052 TDLOFD-001052 LOFD-001019 TDLOFD-001019 LOFD-001072 LOFD-001043 TDLOFD-001043 Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.. Ltd.RRCRedirection.eRAN CS Fallback 9 Counters Counter ID Counter Name Counter Descriptio Feature ID n TDLOFD-001034 LOFD-001035 Feature Name GERAN CS Fallback to GERAN CS Fallback to CDMA2000 1xRTT 1526728323 L.E2W LOFD-001033 Number of CS fallback procedures from E-UTRAN to TDLOFD-001033 UTRAN<?Pub CS Fallback to UTRAN CS Fallback to UTRAN Caret?> 1526728324 L.CSFB.E2G LOFD-001034 Number of CS fallback procedures from E-UTRAN to TDLOFD-001034 GERAN CS Fallback to GERAN CS Fallback to GERAN CS Fallback to UTRAN CS Fallback to UTRAN Flash CS Fallback to UTRAN Flash CS Fallback to UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN Distance based inter-RAT handover to UTRAN Service based inter-RAT handover to UTRAN Service based inter-RAT handover 1526728326 L. 9-10 . Number of outgoing LOFD-001034 E2G.PrepAttOut blind handover TDLOFD-001033 attempts from E-UTRAN to LOFD-001019 TDLOFD-001019 WCDMA network CS Fallback to UTRAN CS Fallback to UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN 1526728329 L.eRAN CS Fallback 9 Counters Counter ID Counter Name Counter Descriptio Feature ID n Feature Name to UTRAN 1526728327 L. Number of outgoing LOFD-001033 E2W.BlindHO.RRCRedirection.IRATHO.E Number of 2G redirections to GERAN LOFD-001034 TDLOFD-001034 LOFD-001053 TDLOFD-001053 LOFD-001020 TDLOFD-001020 LOFD-001073 LOFD-001046 TDLOFD-001046 CS Fallback to GERAN CS Fallback to GERAN Flash CS Fallback to GERAN Flash CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN Distance based inter-RAT handover to GERAN Service based inter-RAT handover to GERAN Service based inter-RAT handover to GERAN 1526728328 L.IRATHO.PrepAttOut blind handover TDLOFD-001034 attempts from CS Fallback to GERAN Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. 9-11 ..BlindHO. Ltd. E Number of 2G.. 9-12 . Ltd.RRCRedirection.PrepAtt redirection preparations to WCDMA network LOFD-001033 TDLOFD-001033 LOFD-001052 TDLOFD-001052 LOFD-001019 TDLOFD-001019 LOFD-001072 LOFD-001043 TDLOFD-001043 CS Fallback to UTRAN CS Fallback to UTRAN Flash CS Fallback to UTRAN Flash CS Fallback to UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN PS Inter-RAT Mobility between E-UTRAN and UTRAN Distance based inter-RAT handover to UTRAN Service based inter-RAT handover to UTRAN Service based inter-RAT handover to UTRAN 1526728331 L.PrepAtt redirection preparations to GERAN LOFD-001034 TDLOFD-001034 LOFD-001053 TDLOFD-001053 LOFD-001020 CS Fallback to GERAN CS Fallback to GERAN Flash CS Fallback to GERAN Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.eRAN CS Fallback 9 Counters Counter ID Counter Name Counter Descriptio Feature ID n E-UTRAN to LOFD-001020 TDLOFD-001020 Feature Name CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN GERAN 1526728330 L.RRCRedirection.E Number of 2W. .eRAN CS Fallback 9 Counters Counter ID Counter Name Counter Descriptio Feature ID n TDLOFD-001020 LOFD-001073 LOFD-001046 TDLOFD-001046 Feature Name Flash CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN Distance based inter-RAT handover to GERAN Service based inter-RAT handover to GERAN Service based inter-RAT handover to GERAN Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Ltd. 9-13 . eRAN CS Fallback 10 Glossary 10 Glossary For the acronyms. Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. abbreviations.. terms. and definitions. 10-1 . Ltd. see Glossary. .401.eRAN CS Fallback 11 Reference Documents 11 Reference Documents This chapter lists the reference documents related to CSFB: [1] 3GPP TS 23.272.018. "General Packet Radio Service (GPRS). Base Station System (BSS)-Serving GPRS Support Node (SGSN).216.300. 11-1 . "General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access" [6] 3GPP TS 48. "E-UTRAN Overall description" [5] 3GPP TS 23. Ltd. BSS GPRS Protocol (BSSGP)" [7] eNodeB MO Reference [8] eNodeB Performance Counter Reference [9] Mobility Management in Connected Mode Feature Parameter Description [10] Idle Mode Management Feature Parameter Description [11] eNodeB Initial Configuration Guide [12] eNodeB Reconfiguration Guide Issue 04 (2012-09-20) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. "Circuit Switched (CS) fallback in Evolved Packet System (EPS)" [2] 3GPP TS 23. Stage 2" [3] VoLGA Forum Specifications [4] 3GPP TS 36. "Single Radio Voice Call Continuity (SRVCC).