GBSS15.0 GBSS Capacity Monitoring Guide (BSC6910-Based) Issue 01 Date 2013-05-04 HUAWEI TECHNOLOGIES CO., LTD. Copyright © Huawei Technologies Co., Ltd. 2013. 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 a 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: http://www.huawei.com Email:
[email protected] Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. i GBSS15.0 GBSS Capacity Monitoring Guide (BSC6910-Based) About This Document About This Document Overview This document provides guidelines for GBSS capacity monitoring and provides methods for diagnosing network capacity problems. It helps maintenance engineers and network optimization engineers monitor the usage of network resources in a timely manner, provides data basis for adjusting, optimizing, and expanding network capacity, and prevents deterioration in network quality and user experience due to insufficient network capacity. Product Version The following table lists the product versions related to this document. Product Name Product Version BSC6910 V100R015C00 BTS3900 V100R008C00 The mapping single-mode base station versions are: l GBTS: V100R015C00 l eGBTS: V100R015C00 BTS3900A BTS3900L BTS3900AL DBS3900 Intended Audience This document is intended for: l Maintenance engineers l Network optimization engineers Organization 1 Change in the GBSS Capacity Monitoring Guide (BSC6910-Based) Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. ii GBSS15. iii . data loss. 5 Equipment Resource Monitoring Monitoring equipment resources involves monitoring the loads of EGPUa/EXPUa boards. 4 Radio Resource Monitoring Monitoring radio resources involves monitoring the loads of PCHs. Conventions Symbol Conventions The symbols that may be found in this document are defined as follows. if not avoided. could result in minor or moderate injury. and PDCHs. if not avoided. and inter-subrack BSC communication resources.. performance deterioration. could result in death or serious injury. Gb. General Conventions The general conventions that may be found in this document are defined as follows. Provides additional information to emphasize or supplement important points of the main text. TCHs.0 GBSS Capacity Monitoring Guide (BSC6910-Based) About This Document The section provides information about the changes in different document versions of GBSS Capacity Monitoring Guide (BSC6910-Based). could result in equipment damage. and Abis interface transmission resources. Indicates a hazard with a low level of risk which. 2 System Capacity Data Collection This section describes how to collect. monitor. or unanticipated results. Ltd. Indicates a potentially hazardous situation that. SDCCHs. and analyze measurement results of performance counters related to GBSS capacity on the M2000 client. 6 Transmission Resource Monitoring Monitoring transmission resources involves monitoring the loads of A. 3 Capacity Counter Categories and Capacity Problem Locating Methods This chapter describes key performance counters related to all capacity resources and provides the methods for identifying and troubleshooting resource bottleneck. Indicates a tip that may help you solve a problem or save time. Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. interface boards. if not avoided. Symbol Description Indicates a hazard with a high level or medium level of risk which. A minimum of one item or a maximum of all items can be selected.. > Multi-level menus are in boldface and separated by the ">" signs.. menus. Convention Description Boldface Buttons. Ltd.. } Optional items are grouped in braces and separated by vertical bars. log in as user root. For example.. [ x | y | . ]* Optional items are grouped in brackets and separated by vertical bars. For example. choose File > Create > Folder. folders.0 GBSS Capacity Monitoring Guide (BSC6910-Based) About This Document Convention Description Times New Roman Normal paragraphs are in Times New Roman. tabs. [] Items (keywords or arguments) in brackets [ ] are optional. Keyboard Operations The keyboard operations that may be found in this document are defined as follows....GBSS15. [ x | y | . iv . { x | y | . }* Optional items are grouped in braces and separated by vertical bars. Italic Book titles are in italics. click OK. ] Optional items are grouped in brackets and separated by vertical bars.. Boldface Names of files. One item is selected or no item is selected. and dialog titles are in boldface. Courier New Examples of information displayed on the screen are in Courier New. GUI Conventions The GUI conventions that may be found in this document are defined as follows. directories. parameters. and users are in boldface. Several items or no item can be selected. { x | y | . window. One item is selected. For example. Command Conventions The command conventions that may be found in this document are defined as follows. Italic Command arguments are in italics.. Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Convention Description Boldface The keywords of a command line are in boldface. For example. Key 1+Key 2 Press the keys concurrently. press Enter and press Tab.0 GBSS Capacity Monitoring Guide (BSC6910-Based) About This Document Format Description Key Press the key.. Mouse Operations The mouse operations that may be found in this document are defined as follows.GBSS15. Issue 01 (2013-05-04) Action Description Click Select and release the primary mouse button without moving the pointer. pressing Ctrl+Alt +A means the three keys should be pressed concurrently. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. v . pressing Alt. For example. For example. Drag Press and hold the primary mouse button and move the pointer to a certain position. Ltd. A means the two keys should be pressed in turn. Double-click Press the primary mouse button twice continuously and quickly without moving the pointer. Key 1. Key 2 Press the keys in turn. ..........................5 3...............................................5 Inter-Subrack BSC Communication Bandwidth and Load.................1 Abis over TDM ........4 3............................................................3 GSM UP Subsystem PS Resources.......................................................................................28 6................4................................................................................................................................................................................................20 5........9 3....................................................3 Gb over IP..................................................................................ii 1 Change in the GBSS Capacity Monitoring Guide (BSC6910-Based).........2 GSM UP Subsystem CS Resources.......................................................................................................20 5........................................................................................1 Methods for Locating Capacity Problems................3 3 Capacity Counter Categories and Capacity Problem Locating Methods...........1 Capacity Counter Categories. vi .....................................................1 PCH Load.............................................................................................24 6..............................................................................................................................2 Methods for Troubleshooting Capacity Problems.....................................................18 5..........................................................................................2.............................................................10 4 Radio Resource Monitoring.....................................................................27 6.............................................................................2..........................................................................................................9 3............15 4....................................................................................................4 PDCH Load............................................................................................................................1 2 System Capacity Data Collection...............................................................................................................................................1 A over IP (Signaling)..........22 6 Transmission Resource Monitoring..................................3 TCH Load................................1 GSM CP Subsystem Resources................................................................................................................4 Abis Interface................................14 4............................0 GBSS Capacity Monitoring Guide (BSC6910-Based) Contents Contents About This Document................................................... Ltd.........................2 Capacity Monitoring and Problem Locating Methods...............................................................4.......................................19 5................................................................28 6..................21 5.2 Abis over IP..............................................29 Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.....................................25 6.....................................................GBSS15..26 6..................................................................................................................................................................................................................13 4................................................................................................4 Interface Board Load.....................................16 4...................16 5 Equipment Resource Monitoring........................................2 A over IP (Traffic)........................................................................................................2 SDCCH Load.................................................................................................................................................................... GBSS15. 1 . 01 (2013-05-04) This is the first commercial release of GBSS14.2 SDCCH Load 4. this issue excludes the following new topics: Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. this issue includes the following new topics: l 3.4 PDCH Load 5.0. 4.2 Capacity Monitoring and Problem Locating Methods Compared with issue Draft A (2013-02-27) of GBSS14. 4. this issue includes the following incorporate changes: Content Description 3 Capacity Counter Categories and Capacity Problem Locating Methods Changed the name of this chapter from Capacity Counter Categories and Capacity Expansion Specifications to Capacity Counter Categories and Capacity Problem Locating Methods.0. Ltd.4 Interface Board Load 5.0. Compared with issue Draft A (2013-02-27) of GBSS14.1 PCH Load Added the description about monitoring principles in the Related Counters.3 TCH Load 4.5 Inter-Subrack BSC Communication Bandwidth and Load Compared with issue Draft A (2013-02-27) of GBSS14..0.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 1 1 Change in the GBSS Capacity Monitoring Guide (BSC6910-Based) Change in the GBSS Capacity Monitoring Guide (BSC6910-Based) The section provides information about the changes in different document versions of GBSS Capacity Monitoring Guide (BSC6910-Based). 2 .0 GBSS Capacity Monitoring Guide (BSC6910-Based) l 1 Change in the GBSS Capacity Monitoring Guide (BSC6910-Based) Capacity Monitoring and Problem Location Methods Draft A (2013-02-27) This is the Draft A release of GBSS15.GBSS15. Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Ltd..0. The M2000 client communicates with NEs properly. In addition. 3 . or 24-hour measurement period.GBSS15. Context For the ease of daily capacity load monitoring. Prerequisites l You have logged in to the M2000 client. ----End Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.. Procedure Step 1 On the M2000 client. NOTE l For details about how to collect performance counters and monitor the counters in real time. monitor. and analyze measurement results of performance counters related to GBSS capacity on the M2000 client. 60-minute.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 2 2 System Capacity Data Collection System Capacity Data Collection This section describes how to collect. Step 3 Analyze and evaluate the measurement results by using the methods and standards provided in this document. collect measurement results of performance counters on the M2000. l Peak hours in a day refer to the time when the BSC traffic volume reaches the maximum. Ltd. The performance counters are measured in a 15-minute. In normal cases. Step 2 On the M2000 client. see "Performance Management" in the M2000 online help. register a user-defined measurement task for collecting measurement results of capacity-related counters. l You have been granted the performance management permission. periodically collect the measurement results. provide an analysis report on capacity monitoring. you are advised to analyze 60-minute traffic statistics measured in peak hours every day and use an Excel file to make a graph of the capacity load trend. GBSS15. 4 . equipment resources. and transmission resources.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 3 3 Capacity Counter Categories and Capacity Problem Locating Methods Capacity Counter Categories and Capacity Problem Locating Methods About This Chapter This chapter describes key performance counters related to all capacity resources and provides the methods for identifying and troubleshooting resource bottleneck. 3. Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Ltd.1 Capacity Counter Categories GBSS capacity resources are categorized into radio resources.2 Capacity Monitoring and Problem Locating Methods This chapter describes the methods for monitoring capacity-related counters and locating capacity problems during routine capacity maintenance. This section describes key performance counters and capacity expansion specifications for these resources.. 3. . you are advised to predict and analyze the changes and determine the capacity optimization solution for the network where traffic volume increases rapidly. or a new charging policy is used.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 3 Capacity Counter Categories and Capacity Problem Locating Methods 3.4 PDCH Load TBF congestion rate 3% Resource Counter Capacity Expansion Specification 5. Contact local Huawei engineers if you require capacity evaluation and optimization services. adjustment.1 GSM CP Subsystem Resources Average CPU Usage of the CPU 70% Table 3-2 Equipment resources Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.1 Capacity Counter Categories GBSS capacity resources are categorized into radio resources. the capacity expansion specifications for capacity-related counters are changeable. a new service needs to be deployed. equipment resources. l The capacity expansion specifications described in this document are defined for the network with a stable increase in the traffic volume and for reference only. evaluation. network capacity is dynamically changing.1 PCH Load OVERLOAD rate of paging 2% or PCH load 70% 4. Ltd. In this situation. l The capacity expansion specifications described in this section are lower than the actual alarm generation thresholds so that capacity problems can be located in advance.GBSS15.2 SDCCH Load Congestion Rate on SDCCH per CELL 2% 4. This leads to a sudden change in the loads of network capacity resources. the traffic model and number of subscribers may change abruptly. These specifications can be customized according to the actual situation. including capacity prediction. CAUTION l With the network development. Therefore.3 TCH Load Congestion Rate on TCH 2% 4. 5 . If a new service is deployed or a new charging policy is used. and transmission resources. and expansion. Table 3-1 Radio resources Resource Counter Capacity Expansion Specification 4. This section describes key performance counters and capacity expansion specifications for these resources. 2 GSM UP Subsystem CS Resources TC load of UP subsystem 70% 5.3 GSM UP Subsystem PS Resources PDCH load of the UP subsystem 70% 5.1 Abis over TDM l Flex Abis: 3% Congestion Rate of Dynamic Resource Assignment (16 kbit/s) or Congestion Rate of Dynamic Resource Assignment (8 kbit/s) l Non-Flex Abis: 3% Percentage of failed application attempts of Abis timeslots because of no idle timeslot (in nonFlex Abis mode) Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.GBSS15.. Ltd.4 Interface Board Load Average Forwarding Ratio of Interface Boards 70% 5.5 Inter-Subrack BSC Communication Bandwidth and Load Peak inter-subrack traffic usage 60% Average inter-subrack traffic 40% usage Inter-subrack packet loss rate 0.01% Table 3-3 Transmission resources (TDM transmission mode) Resource Counter Capacity Expansion Specification 6.4.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 3 Capacity Counter Categories and Capacity Problem Locating Methods Resource Counter Capacity Expansion Specification 5. 6 . GBSS15. 7 . Ltd..0 GBSS Capacity Monitoring Guide (BSC6910-Based) 3 Capacity Counter Categories and Capacity Problem Locating Methods Table 3-4 Transmission resources (IP transmission mode) Resource Counter Capacity Expansion Specification A over IP (Signaling) Receive bandwidth requirement/Bandwidth allocated by the transport bearer network 70% or Transmit bandwidth requirement/Bandwidth allocated by the transport bearer network A over IP (Traffic) Forward Bandwidth Allocated to IP Transport Adjacent Node/Bandwidth allocated by the bearer network 70% or Backward Bandwidth Allocated to IP Transport Adjacent Node/Bandwidth allocated by the bearer network or Mean Receive Rate of the FEGE Ethernet Port/ Bandwidth of the physical Ethernet port or Mean Transmit Rate of the FEGE Ethernet Port/ Bandwidth of the physical Ethernet port Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. 2 Abis over IP Forward Bandwidth Allocated to IP Transport Adjacent Node/Bandwidth allocated by the bearer network 70% or Backward Bandwidth Allocated to IP Transport Adjacent Node/Bandwidth allocated by the bearer network or Mean Receive Rate of the FEGE Ethernet Port/ Bandwidth of the physical Ethernet port or Mean Transmit Rate of the FEGE Ethernet Port/ Bandwidth of the physical Ethernet port Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.GBSS15.4. Ltd.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 3 Capacity Counter Categories and Capacity Problem Locating Methods Resource Counter Capacity Expansion Specification Gb over IP Forward Bandwidth Allocated to IP Transport Adjacent Node/Bandwidth allocated by the bearer network 70% or Backward Bandwidth Allocated to IP Transport Adjacent Node/Bandwidth allocated by the bearer network or Mean Receive Rate of the FEGE Ethernet Port/ Bandwidth of the physical Ethernet port or Mean Transmit Rate of the FEGE Ethernet Port/ Bandwidth of the physical Ethernet port 6. 8 .. GBSS15.2. Determining the possible top N problem cells facilitates follow-up troubleshooting. 9 . Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. For details about resource insufficiency analysis and relevant solutions. You are advised to analyze accessibility-related KPIs to identify the resource insufficiency that causes access congestion..2 Capacity Monitoring and Problem Locating Methods This chapter describes the methods for monitoring capacity-related counters and locating capacity problems during routine capacity maintenance. an abnormal KPI triggers the troubleshooting process.2. 3. Figure 3-1 shows the general troubleshooting process.2 Methods for Troubleshooting Capacity Problems. In most cases.1 Methods for Locating Capacity Problems This section describes how to locate capacity problems. Ltd.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 3 Capacity Counter Categories and Capacity Problem Locating Methods 3. see3. GBSS15.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 3 Capacity Counter Categories and Capacity Problem Locating Methods Figure 3-1 Flowchart for capacity problem location NOTE The analysis report on the capacity problem is provided after capacity data collection and analysis are complete. Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.2 Methods for Troubleshooting Capacity Problems This section describes how to troubleshoot capacity problems.2. Ltd. 10 .. 3. Split location areas (LAs). CS service processing boards are overloaded Expand EGPUa/EXPUa(Logical function type is set to GCUP) boards.. If TCHs are not congested. modify the PDCH proportion threshold. If TCHs are congested. Enable TCHHs and lower the threshold for enabling TCHHs. PDCHs. PCHs are overloaded 1. and PDCHs are insufficient at the same time. Insufficiency in a certain type of resource unnecessarily indicates resource insufficiency in the entire BSS. perform capacity expansion on the BSS. TCHs. or SDCCHs unnecessarily requires capacity expansion. Transmission resources are overloaded Expand the transmission resource capacity. PDCHs are congested Check whether TCHs are congested.. Ltd. PS service processing boards are overloaded Expand EGPUa/EXPUa(Logical function type is set to GCUP) boards. If the problem persists. Table 3-5 Solutions to common capacity problems If. and others require capacity expansion. add TRXs. Some capacity problems can be resolved by resource adjustment and optimization. TCHs are congested 1. comprehensively analyze the three types of channels and determine whether the problem can be resolved by channel optimization.GBSS15. and SDCCHs can be mutually converted. If SDCCHs. Therefore..0 GBSS Capacity Monitoring Guide (BSC6910-Based) 3 Capacity Counter Categories and Capacity Problem Locating Methods The BSS capacity resources are correlated because of resource sharing. Then. insufficiency in TCHs. 2. Table 3-5 lists the recommended solutions to common capacity problems. If SDCCHs are insufficient. you can decrease the number of TCHs or enable the dynamic SDCCH conversion function. Overall capacity evaluation is necessary especially for the networks where the traffic volume increases rapidly and before a new charging policy is used. 2. 1. Enable the dynamic CCCH conversion function. For example. 11 . 2. formulate a feasible plan for monitoring network capacity and detecting resource insufficiency. you are advised to comprehensively analyze related resources. SDCCHs are congested Enable the dynamic SDCCH conversion function. Issue 01 (2013-05-04) The control plane (CP) is overloaded Expand EGPUa/EXPUa(Logical function type is set to GCUP) boards. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Add TRXs. TCHs. Based on the capacity evaluation... Before expanding capacity. PDCHs. add a BSC. Ltd.GBSS15. 12 .0 GBSS Capacity Monitoring Guide (BSC6910-Based) 3 Capacity Counter Categories and Capacity Problem Locating Methods NOTE If the BSC has been fully configured and board expansion is required. Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.. 4 PDCH Load Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.1 PCH Load 4.3 TCH Load 4. 13 .2 SDCCH Load 4. SDCCHs. 4. TCHs..GBSS15.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 4 4 Radio Resource Monitoring Radio Resource Monitoring About This Chapter Monitoring radio resources involves monitoring the loads of PCHs. Ltd. and PDCHs. paging is performed on a basis of location area (LA).2354 x 2.1 PCH Load Related Counters The PDCH load is indicated by the following counters: l RL3188: OVERLOAD rate of paging——This counter provides the percentage of CS and PS paging overload times over the PCH on the Abis interface to all paging times.GBSS15. Number of CCCH blocks reserved for AGCH: 2 Paging message combination efficiency: 2. The formula for calculating the PCH load is as follows: PCH load = (A330: Delivered Paging Messages for CS Service + A331: Delivered Paging Messages for PS Service)/PCH paging capability x 100% where. If the actual paging volume in an LA exceeds the theoretical PCH paging capacity.Number of CCCH blocks reserved for AGCH) x Time for sending a BCCH multiframe] x Paging message combination efficiency x Um interface usage between paging groups x 3600 NOTE l Time for sending a BCCH multiframe: 0.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 4 Radio Resource Monitoring 4. the PCH paging capability provides a basis for planning location areas (LAs) because paging messages are sent on a basis of LA.87 x 80% x 3600 = 245791 times/hour Capacity Expansion Threshold RL3188: OVERLOAD rate of paging > 2% or PCH load > 70%. l PCH load——This counter is a calculation counter. Ltd..) l Um interface usage between paging groups: The imbalance between paging groups and between services imbalance regarding time decreases the Um interface usage. In the GSM system. PCHs become congested and even overloaded.) Um interface usage between paging groups: 80% Therefore. Impact on System l Issue 01 (2013-05-04) Call MSs are paged on PCHs. The formula for calculating the PCH paging capability is as follows: PCH paging capability = [(Number of CCCH blocks . For example. l Paging message combination efficiency: Efficiency for encapsulating paging messages on the Um interface.87 (The first paging adopts the TMSI-based paging policy and the second paging adopts the IMSI-based paging policy. and the network traffic volume is increasing constantly. 14 . Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.Number of CCCH blocks reserved for AGCH) x Paging message combination efficiency x Um interface usage between paging groups]/(51 x TDMA period) Number of CCCH blocks: The number of message blocks for a non-combined CCCH is 9. which reflects the percentage of paging times to the PCH paging capability. This decreases the paging success rate and deteriorates user experience. paging capability using common configurations in most scenarios is calculated as follows: Paging capability = [(Number of CCCH blocks .2354s. (The efficiency is determined by the IMSI-based or TMSI-based paging policy. the paging capability in this example is calculated as follows: Paging capability = (9-2)/0. and PDCHs. An MS needs to occupy an SDCCH each time the MS initiates an SMS.2 SDCCH Load Related Counters GSM signaling services are carried on SDCCHs. an MS cannot perform services. the BSS considers SDCCHs as congested and increments the number of SDCCH congestion occurrences by 1. performs a location update. Causes for insufficient SDCCHs include inappropriate network planning and service surge during regional events. or sets up a call. and therefore normal operation of SDCCHs needs to be preferentially ensured. If SDCCHs are insufficient. In normal cases.GBSS15. If SDCCHs are insufficient. l Split an LA to reduce its capacity.0 GBSS Capacity Monitoring Guide (BSC6910-Based) l 4 Radio Resource Monitoring The BSS reports ALM-21822 Cell PCH Congestion when PCHs in a cell are congested. Relationship with Other Counters None Recommended Measures l Enable the GBFD-511503 Dynamic Multiple CCCH feature to expand the PCH capacity. TCHs. 4. 15 . performs a location update. enable the dynamic SDCCH conversion function to ensure that SDCCHs are sufficient. and a called MS cannot respond. or sets up a call. SDCCHs are vital to process services. The SDCCH load is indicated by the following counter: RR370: Congestion Rate on SDCCH per CELL ——This counter provides the percentage of times that all requested SDCCHs are occupied to all SDCCH request times. Capacity Expansion Threshold RR370: Congestion Rate on SDCCH per CELL > 2% Impact on System GSM signaling services are carried on SDCCHs. It indicates the SDCCH congestion due to insufficient resources. Recommended Measures l Enable the dynamic SDCCH conversion function. Ltd. In this situation. Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. TCHs and PDCHs are all congested at the same time or SDCCHs are still congested after the dynamic SDCCH conversion function is enabled.. Relationship with Other Counters SDCCHs. an MS fails to initiate SMS. TCHs. l Expand TRX capacity if SDCCHs. a calling MS cannot access the network. An MS needs to occupy an SDCCH each time the MS initiates an SMS. and PDCHs need to be analyzed comprehensively because Huawei GBSS has implemented dynamic conversions among SDCCHs. PDCHs can be preempted by CS services. l Issue 01 (2013-05-04) Uplink TBF Congestion Rate: This counter provides the percentage of TBF establishment failures on the uplink due to insufficient resources. A PDCH can be shared by a maximum of 16 MSs in the downlink. and PDCHs. and PDCHs need to be analyzed comprehensively because Huawei GBSS has implemented dynamic conversions among SDCCHs. Therefore. the downlink TBF congestion rate is the primary focus of PDCH load monitoring. TCHs and PDCHs need to be analyzed comprehensively. In normal cases. Capacity Expansion Threshold K3045: Congestion Rate on TCH > 2% Impact on System If TCHs are insufficient. Relationship with Other Counters SDCCHs. Recommended Measures l Enable TCHHs and lower the threshold for enabling TCHHs. the BSS considers TCHs as congested and increments the number of TCH congestion occurrences by 1.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 4 Radio Resource Monitoring 4.4 PDCH Load Related Counters PS signaling and data are carried on PDCHs. The PDCH load is indicated by the counters related to the temporary block flow (TBF) congestion rate. 4.3 TCH Load Related Counters CS services are carried on TCHs. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. 16 . Therefore. l Expand TRX capacity. Ltd. If TCHs are insufficient. the downlink PS data throughput is higher than the uplink PS data throughput. TBFs are data blocks transmitted over PDCHs. TCHs. This greatly deteriorates user experience. The TCH load is indicated by the following counter: K3045: Congestion Rate on TCH ——This counter provides the TCH congestion rate. CS services have difficulties accessing the network. an MS cannot perform CS services. It indicates the percentage of TCH request failures due to no idle TCHs to all TCH requests.GBSS15. In this situation.. Note that the voice quality of TCHHs is a little poorer than that of TCHFs. TCHs. The TBF congestion rate consists of the uplink TBF congestion rate and the downlink TBF congestion rate. Recommended Measures l l Take measures based on specific causes for insufficient PDCHs. If TCHs and PDCHs in a cell are insufficient during peak hours. and therefore TCHs and PDCHs are insufficient for processing services during peak hours. and PDCHs need to be analyzed comprehensively because Huawei GBSS has implemented dynamic conversions among SDCCHs. 1. Check the following counters to determine the root causes for insufficient PDCHs: – Percentage of PDCH application failures due to the limited PDCH proportion threshold = R9395: Number of PDCH Application failures For CELL PDCH Ratio Thresh/R9393: Number Of PDCH Application Attempts – Percentage of PDCH application failures due to no TCH available = R9394: Number of PDCH Application Failures due to no Convertable TCHs/R9393: Number Of PDCH Application Attempts If the PDCH proportion threshold is set to a value that is too small. expand TRX capacity.0 GBSS Capacity Monitoring Guide (BSC6910-Based) l 4 Radio Resource Monitoring Downlink TBF Congestion Rate: This counter provides the percentage of TBF establishment failures on the downlink due to insufficient resources. Relationship with Other Counters SDCCHs. In this situation. TCHs. 2. the GPRS/EDGE service rate decreases. PDCHs are insufficient but some TCHs are idle during peak hours. increase the threshold..GBSS15. Capacity Expansion Threshold Uplink TBF Congestion Rate > 3% Or Downlink TBF Congestion Rate > 3% Impact on System If PDCHs are insufficient. optimize related parameters or expand TRX capacity. Ltd. The PDCH proportion threshold for a cell is set to a small value. increase the PDCH proportion threshold. Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. In this situation. and therefore few TCHs can be converted to PDCHs. and PDCHs. As a result. TCHs. The channels in a cell are insufficient. 17 . and even some MSs cannot process PS services. 18 .4 Interface Board Load 5.1 GSM CP Subsystem Resources 5.GBSS15.2 GSM UP Subsystem CS Resources 5. and inter-subrack BSC communication resources. 5.. Ltd.3 GSM UP Subsystem PS Resources 5. interface boards.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 5 5 Equipment Resource Monitoring Equipment Resource Monitoring About This Chapter Monitoring equipment resources involves monitoring the loads of EGPUa/EXPUa boards.5 Inter-Subrack BSC Communication Bandwidth and Load Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. This results in access problems. If the CPU is severely overloaded. see Technical Specifications of the EGPUa Board and Technical Specifications of the EXPUa Board. l If the CPU of the EGPUa or EXPUa board becomes overloaded. NOTE The EGPUa or EXPUa board is used to process services on the GSM BSC control plane and user plane. Ltd. the BSS reports ALM-20256 CPU Overload.GBSS15. You are advised to: l Expand EGPUa or EXPUa boards when the value of this counter exceeds 70% during peak hours for successive three or more days on a network with slow service growth.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 5 Equipment Resource Monitoring 5. respectively. It indicates the load and operating performance of the CPU on the board in a measurement period. the load of control plane (CP) and user plane (UP) subsystems is indicated by the load of the EGPUa or EXPUa board that functions as the GCUP. Capacity Expansion Threshold [AR9720: Average CPU Usage of the CPU] > 70% Impact on System l When the CPU becomes overloaded. the BSS automatically forbids maintenance activities such as collecting logs and obtaining traffic statistics files. When this occurs. l Analyze capacity requirements and formulate a capacity expansion solution when the value of this counter exceeds 50% on a network with rapid service growth.1 GSM CP Subsystem Resources Related Counters For BSC6910. Specifically. For details about the functions of the EGPUa or EXPUa board.. Relationship with Other Counters None Recommended Measures Monitor the CPU load on the EGPUa or EXPUa board based on the value of the AR9720: Average CPU Usage of the CPU counter during peak hours of a day. Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. the load of the CP subsystem is indicated by the following counter: AR9720: Average CPU Usage of the CPU —— This counter provides the mean CPU usage of a board in a measurement period. 19 . the BSC triggers the flow control during which paging messages or channel request messages are discarded. a large number of subscribers cannot access the network. 3 GSM UP Subsystem PS Resources Related Counters For BSC6910. PS load of the UP subsystem = [AS9204: AverageNumber of PDCHs Occupied per BSC]/ [Maximum number of PDCHs supported by the EGPUa or EXPUa board x Number of EGPUa or EXPUa boards that function as the GCUP] Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. the load of CP and UP subsystems is indicated by the load of the EGPUa or EXPUa board that functions as the GCUP. Specifically. CS load of the UP subsystem = [ZK3014: Traffic Volume on TCH (Traffic Channel) per BSC]/ [Maximum traffic volume supported by the EGPUa or EXPUa board × Number of EGPUa or EXPUa boards that function as the GCUP] NOTE l If the EGPUa or EXPUa board functions as the GCUP. Relationship with Other Counters None Recommended Measures Expand EGPUa or EXPUa boards. severely deteriorating user experience. 20 . Capacity Expansion Threshold [CS load of UP subsystem] > 70% Impact on System Insufficient CS resources cause call setup failures. the CS load of the UP subsystem is indicated by the CS load of the EGPUa or EXPUa board during peak hours. the load of CP and UP subsystems is indicated by the load of the EGPUa or EXPUa board that functions as the GCUP. This is because CS resources of the UP subsystem are used to process speech coding and decoding.GBSS15. l If the EGPUa or EXPUa board functions as the GCUP and works in resource pool mode. the maximum traffic volume supported by an EGPUa or EXPUa board is 6250 Erl. the PS load of the UP subsystem is indicated by the PDCH load of the EGPUa or EXPUa board during peak hours.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 5 Equipment Resource Monitoring 5. you are advised to configure at least two EGPUa or EXPUa boards for a BSC6910. Ltd. 5. Specifically.2 GSM UP Subsystem CS Resources Related Counters For BSC6910.. Ltd. you are advised to configure at least two EGPUa or EXPUa boards for a BSC6910. the maximum number of PDCHs supported by an EGPUa or EXPUa board is 3000.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 5 Equipment Resource Monitoring NOTE l If the EGPUa or EXPUa board functions as the GCUP. It indicates the load and operating performance of the CPU on the board in a measurement period. Capacity Expansion Threshold [AR9705a: Average Forwarding Ratio of Interface Boards] > 70% or [AR9720: Average CPU Usage of the CPU] > 70% Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. AR9720: Average CPU Usage of the CPU——This counter provides the mean CPU usage of a board in a measurement period. It indicates the load and operating performance of an interface board within a measurement period. Abis. Relationship with Other Counters None Recommended Measures Expand EGPUa or EXPUa boards. The user-plane interface board load is indicated by the following counters: AR9705a: Average Forwarding Ratio of Interface Boards——This counter provides the average forwarding load of an interface board within a measurement period. some PDCHs cannot be activated. 21 .GBSS15. l If the EGPUa or EXPUa board functions as the GCUP and works in resource pool mode. Capacity Expansion Threshold [PS load of the UP subsystem] > 70% Impact on System If EGPUa or EXPUa boards which processes PS services are insufficient. The forwarding load refers to the percentage of the actual forwarding rate to the designed maximum forwarding rate of an interface board..4 Interface Board Load Related Counters When monitoring the load of interface boards. This causes a decrease in PS service rate and difficult access. NOTE Interface boards are A. 5. Gb interface boards on the BSC. check whether the forwarding rate of data flow exceeds the designed maximum forwarding rate and whether the CPU of the interface board is overloaded. Inter-subrack BSC communication bandwidths are as follows: l The inter-subrack BSC communication bandwidth is 40 Gbit/s when active and standby SCUb boards are configured. If the forwarding load is too high. Relationship with Other Counters None Recommended Measures Expand the capacity of interface boards. the SCU board may become overloaded and discard some messages. the BSS may discard some messages. 5.) Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. l The preceding bandwidths are halved when a standalone SCUb is running. This deteriorates the quality of service (QoS) of CS and PS services. l If the forwarding load of an interface board is too high. the BSS reports ALM-20275 Forwarding Overload of An Interface Board. 22 .0 GBSS Capacity Monitoring Guide (BSC6910-Based) 5 Equipment Resource Monitoring Impact on System l If the forwarding load over an interface is too high.5 Inter-Subrack BSC Communication Bandwidth and Load Related Counters Messages are forwarded between subracks in a BSC.01% (Prewarning and analysis is required. Inter-subrack BSC communication is monitored by using the following counters: l Peak inter-subrack traffic usage: Peak inter-subrack traffic usage = [HR9732a: Peak Inter-Subrack Transmitting Traffic]/ Inter-subrack bandwidth x 100% l Average inter-subrack traffic usage: Average inter-subrack traffic usage = [AR9732a: Average Inter-Subrack Transmitting Traffic]/Inter-subrack bandwidth x 100% l Inter-subrack packet loss rate Inter-subrack packet loss rate = [R9732a: Number of Discarded Inter-Subrack Packets]/ [R9732b: Number of Sent Inter-Subrack Packets] x 100% Capacity Expansion Threshold l Peak inter-subrack traffic usage > 60% (Prewarning and analysis is required..) l Average inter-subrack traffic usage > 40% (Prewarning and analysis is required. Ltd.GBSS15.) l Inter-subrack packet loss rate > 0. 23 . the QoS of CS and PS services and network KPIs deteriorate.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 5 Equipment Resource Monitoring Impact on System l If the forwarding load over an interface is too high. Ltd. and the BSS becomes unstable. When the inter-subrack BSC communication capacity is close to the overload threshold. The Main Processing Subrack (MPS) is connected to the Extended Processing Subrack (EPS) using the port trunk group on the SCU panel. If this occurs.02%) for 5 minutes or longer. contact Huawei maintenance engineers for in-depth analysis and troubleshooting.. Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.GBSS15. l If the actual link bandwidth usage of the port trunk group on the SCU panel exceeds the congestion threshold (70%) or the packet loss rate over a link exceeds the congestion threshold (0. This deteriorates the quality of service (QoS) of CS and PS services. the BSS reports ALM-20277 Communication Congestion Between Subracks. the BSS may discard some messages. Relationship with Other Counters None Recommended Measures The inter-subrack BSC communication capacity seldom becomes overloaded. 6.2 A over IP (Traffic) 6. radio signaling links (RSLs) and operation and maintenance links (OMLs).0 GBSS Capacity Monitoring Guide (BSC6910-Based) 6 6 Transmission Resource Monitoring Transmission Resource Monitoring About This Chapter Monitoring transmission resources involves monitoring the loads of A.1 A over IP (Signaling) 6.GBSS15.4 Abis Interface The Abis interface is between the BSC and the BTS. Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. carries CS and PS services. Gb. and Abis interface transmission resources.. 24 . The Abis interface can use either the TDM or IP transmission. Ltd.3 Gb over IP 6. and transmission load allocated by the bearer network. This basically meets the actual bandwidth requirements. Relationship with Other Counters None Recommended Measures Add SCTP links. This affects the signaling procedure and CS service processing. Capacity Expansion Threshold [T7263: Average Transmit Rate of an SCTP Link IP Layer]/Bandwidth allocated by the transmission bearer network > 70% Or [T7268: Average Receive Rate of an SCTP Link IP Layer]/Bandwidth allocated by the transmission bearer network > 70% NOTE l SCTP links have no bandwidth configurations.1 A over IP (Signaling) Related Counters In IP transmission mode. 25 . A maximum of one SCTP link is configured for each subsystem on a EGPUa/EXPUa board. the BSC and BTS are configured with FE or GE ports and use 100 or 1000 MHz transmission bandwidth.. l If SCTP links are congested. monitor the bandwidth resources occupied by SCTP links and check whether the transmission resources on the bearer network meet the bandwidth requirements. Ltd. monitor the transmission resource load from two perspectives in IP transmission mode: transmission load of ports on the BSC or the BTS. To ensure the control plane reliability. when STCP links are used.GBSS15. The configuration rule is as follows: 1. the BSS reports ALM-21542 SCTP Link Congestion. The load of SS7 links over the A interface is indicated by the following counters: T7263: Average Transmit Rate of an SCTP Link IP Layer——This counter provides the transmit rate of an SCTP link at the IP layer within a measurement period. Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Therefore. At least one SCTP link is configured for each pair of EGPUa/EXPUa boards. At least two SCTP links are configured. T7268: Average Receive Rate of an SCTP Link IP Layer——This counter provides the receive rate of an SCTP link at the IP layer within a measurement period. Impact on System l SS7 link overload causes congestion and packet loss. 2.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 6 Transmission Resource Monitoring 6. 3. Therefore. configure SCTP links in load sharing mode. 26 .. the BSS reports ALM-21583 Port Congestion. Relationship with Other Counters None Recommended Measures l Issue 01 (2013-05-04) Ask the bearer network vendor to increase the network capacity when the load of the bearer network exceeds 70%.2 A over IP (Traffic) Related Counters In IP transmission mode. Ltd. In A over IP mode. Therefore. This deteriorates user experience. This basically meets the actual bandwidth requirements.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 6 Transmission Resource Monitoring 6. the BSC6910 uses the resource pool networking in which multiple pairs of interface boards form a transmission pool and share the A interface transmission resources. the BSC and BTS are configured with FE or GE ports and use 100 or 1000 MHz transmission bandwidth. or [T7128: Mean Transmit Rate of the FEGE Ethernet Port]/Bandwidth of the physical Ethernet port NOTE l In IP transmission mode. l The bandwidth allocated by the bearer network refers to the bandwidth allocated by the A interface backbone network. The traffic load of A interface transmission resources is indicated by the load of the bearer network and the load of the Ethernet port.GBSS15. Capacity Expansion Threshold Load of the bearer network > 70% Or Load of the Ethernet port > 70% Impact on System l Insufficient circuit transmission resources on the A interface lead to circuit assignment and call setup failures. l If the load of physical ports exceeds the alarm threshold. l Load of the bearer network = [T6519: Forward Bandwidth Allocated to IP Transport Adjacent Node]/Bandwidth allocated by the bearer network. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. or [T6520: Backward Bandwidth Allocated to IP Transport Adjacent Node]/Bandwidth allocated by the bearer network l Load of the Ethernet port = [T7123: Mean Receive Rate of the FEGE Ethernet Port]/ Bandwidth of the physical Ethernet port. the BSC and BTS are configured with FE or GE ports and use 100 or 1000 MHz transmission bandwidth. whether the transmission resources allocated by the bearer network meet requirements is the focus of capacity monitoring in IP transmission mode. GBSS15. 6. Therefore. Capacity Expansion Threshold l [T7123: Mean Receive Rate of the FEGE Ethernet Port/Bandwidth of the physical Ethernet port] > 70% l [T7128: Mean Transmit Rate of the FEGE Ethernet Port/Bandwidth of the physical Ethernet port] > 70% l [T6519: Forward Bandwidth Allocated to IP Transport Adjacent Node]/Bandwidth allocated by the bearer network > 70% l [T6520: Backward Bandwidth Allocated to IP Transport Adjacent Node]/Bandwidth allocated by the bearer network > 70% NOTE l In IP transmission mode.3 Gb over IP Related Counters In IP transmission mode. Impact on System l Insufficient transmission resources on the Gb interface lead to a low GPRS or EDGE service rate and even network access failures. Ltd.0 GBSS Capacity Monitoring Guide (BSC6910-Based) l 6 Transmission Resource Monitoring Expand interface boards when the load of the Ethernet port exceeds 70%. the BSC and BTS are configured with FE or GE ports and use 100 or 1000 MHz transmission bandwidth. Relationship with Other Counters None Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. This basically meets the actual bandwidth requirements. It indicates the data flow on an FE or GE Ethernet port at the data link layer. the BSS reports ALM-21583 Port Congestion. l If the load of physical ports exceeds the alarm threshold. 27 . It indicates the data flow on an FE or GE Ethernet port at the data link layer. whether the transmission resources allocated by the bearer network meet requirements is the focus of capacity monitoring in IP transmission mode.. l T7128: Mean Transmit Rate of the FEGE Ethernet Port —— This counter provides the transmit rate of an FE or GE Ethernet port at the data link layer within a measurement period. The load of Gb transmission resources is indicated by the following counters: l T6519: Forward Bandwidth Allocated to IP Transport Adjacent Node l T6520: Backward Bandwidth Allocated to IP Transport Adjacent Node l T7123: Mean Receive Rate of the FEGE Ethernet Port —— This counter provides the receive rate of an FE or GE Ethernet port at the data link layer within a measurement period. the BSC and BTS are configured with FE or GE ports and use 100 or 1000 MHz transmission bandwidth. 1 Abis over TDM Flex Abis l Related Counters In Flex Abis mode. radio signaling links (RSLs) and operation and maintenance links (OMLs). Therefore. This deteriorates user experience. l Apply for a license for the Gb over IP mode and ensure that license resources are sufficient. The Abis interface can use either the TDM or IP transmission.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 6 Transmission Resource Monitoring Recommended Measures In Gb over IP mode. all Abis TDM timeslots on the BTS can be dynamically allocated. 28 . 6..4. Abis timeslots are allocated based on the actual requirements in real time. carries CS and PS services. the BSC interface board capacity is generally sufficient.4 Abis Interface The Abis interface is between the BSC and the BTS. the load of Abis transmission resources is indicated by the following counters: RR2752: Congestion Rate of Dynamic Resource Assignment (16 kbit/s)——This counter provides the congestion rate of dynamic allocation of 16 kbit/s Abis resources. Ltd. or [T6520: Backward Bandwidth Allocated to IP Transport Adjacent Node/Bandwidth allocated by the bearer network] > 70%. In this mode. l Relationship with Other Counters None l Recommended Measures Expand transmission resources over the Abis interface. or [T7128: Mean Transmit Rate of the FEGE Ethernet Port]/Bandwidth of the physical Ethernet port > 70%. l Capacity Expansion Threshold [RR2752: Congestion Rate of Dynamic Resource Assignment (16 kbit/s)] > 3% Or [RR2751: Congestion Rate of Dynamic Resource Assignment (8 kbit/s)] > 3% l Impact on System Insufficient transmission resources on the Abis interface lead to network access failures. RR2751: Congestion Rate of Dynamic Resource Assignment (8 kbit/s)——This counter provides the congestion rate of dynamic allocation of 8 kbit/s Abis resources. You are advised to: l Expand Gb interface boards when the following condition is met: [T7123: Mean Receive Rate of the FEGE Ethernet Port]/Bandwidth of the physical Ethernet port > 70%.GBSS15. 6. Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. When the BTS receives a CS or PS service request. l Ask the bearer network vendor to increase the network capacity when the following condition is met: [T6519: Forward Bandwidth Allocated to IP Transport Adjacent Node/ Bandwidth allocated by the bearer network] > 70%. focus on the transmission resources allocated by the bearer network on the Gb interface. Abis timeslots.GBSS15. l T6519: Forward Bandwidth Allocated to IP Transport Adjacent Node l T6520: Backward Bandwidth Allocated to IP Transport Adjacent Node l T7123: Mean Receive Rate of the FEGE Ethernet Port —— This counter provides the receive rate of an FE or GE Ethernet port at the data link layer within a measurement period. Therefore. It indicates the data flow on an FE or GE Ethernet port at the data link layer.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 6 Transmission Resource Monitoring Non-Flex Abis Mode l Related Counters In non-Flex Abis mode. the usage of idle Abis timeslots is indicated by the following counters: Percentage of Abis timeslot application failures due to no idle timeslot (in non-Flex Abis mode) = [R9109: Number of Unsuccessful Application Attempts of Abis Timeslot Because of No Idle Timeslot]/[R9101: Number of Application Attempts of Abis Timeslot] l Capacity Expansion Threshold [Percentage of Abis timeslot application failures due to no idle timeslot (in non-Flex Abis mode)] > 3% l Impact on System Insufficient transmission resources on the Abis interface lead to difficulties in improving the PS service rate.4. Ltd. 29 . Therefore. l T7128: Mean Transmit Rate of the FEGE Ethernet Port —— This counter provides the transmit rate of an FE or GE Ethernet port at the data link layer within a measurement period. Abis timeslot capacity expansion is required if TCH and PDCH capacity expansion is performed. In this mode. monitor the transmission resource load of a BTS from two perspectives in Abis over IP mode: bandwidth usage of physical Abis interface boards on the BSC.. except idle Abis timeslots.2 Abis over IP Related Counters The BTS in IP transmission mode is typically configured with FE ports and uses 100 MHz transmission bandwidth. bear one-to-one mapping with the TCHs and PDCHs. and whether the transmission resources allocated by the bearer network meet Abis transmission bandwidth requirements. It indicates the data flow on an FE or GE Ethernet port at the data link layer. The load of IP transmission resources over the Abis interface is indicated by forward or backward bandwidth allocated to IP transport adjacent node and transmit or receive rate of the FE/GE Ethernet port. Capacity Expansion Threshold l [T7123: Mean Receive Rate of the FEGE Ethernet Port/Bandwidth of the physical Ethernet port] > 70% l [T7123: Mean Receive Rate of the FEGE Ethernet Port/Bandwidth of the physical Ethernet port] > 70% Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. This basically meets the GSM service requirements. l Relationship with Other Counters None l Recommended Measures Expand transmission resources over the Abis interface. 6. degrade voice quality and even lead to network access failures. Ask the bearer network vendor to increase the network capacity when the following condition is met: [T6519: Forward Bandwidth Allocated to IP Transport Adjacent Node/ Bandwidth allocated by the bearer network] > 70%. or [T6520: Backward Bandwidth Allocated to IP Transport Adjacent Node/Bandwidth allocated by the bearer network] > 70%. l If the load of physical ports exceeds the alarm threshold. Impact on System l Insufficient transmission resources on the Abis interface decrease PS service rate.0 GBSS Capacity Monitoring Guide (BSC6910-Based) 6 Transmission Resource Monitoring l [T6519: Forward Bandwidth Allocated to IP Transport Adjacent Node/Bandwidth allocated by the bearer network] > 70% l [T6519: Forward Bandwidth Allocated to IP Transport Adjacent Node/Bandwidth allocated by the bearer network] > 70% NOTE l In IP transmission mode. the BSS reports ALM-21583 Port Congestion. Issue 01 (2013-05-04) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co. Relationship with Other Counters None Recommended Measures l Expand Abis interface boards when the following condition is met: [T7123: Mean Receive Rate of the FEGE Ethernet Port/Bandwidth allocated by the bearer network] > 70%. 30 .GBSS15. the BSC and BTS are configured with FE or GE ports and use 100 or 1000 MHz transmission bandwidth. or [T7123: Mean Receive Rate of the FEGE Ethernet Port/Bandwidth allocated by the bearer network] > 70% l Focus on checking whether the bandwidth allocated by the IP bearer network is sufficient.. Ltd.