Umts Call Flows

March 25, 2018 | Author: Nitin Gupta | Category: Communications Protocols, Asynchronous Transfer Mode, Computer Network, Telecommunications Engineering, Telecommunications Standards
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Module 01 UE-UTRAN Signalling ProtocolsVersion 0.0.1 (07/02/2005) Author: Alexander Seifarth ([email protected]) 1 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1. Network Architecture 2 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1. Network Architecture 1.1. Top Level Network Architecture 3 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.1. Top Level Network Architecture UTRAN UTRAN (UMTS Terrestrial (UMTS Terrestrial Radio Access Radio Access Network) Network) Uu Iu CN CN (Core Network) (Core Network) UE Non Access Protocols Access Protocols intra-UTRAN protocols Access Protocols intra-CN protocols 4 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.1. Top Level Network Architecture UMTS inherits its top level network architecture from second generation mobile communication networks. Any UMTS network can be divided into three major network subsystems: • UE (User Equipment): The UE is built from Mobile Equipment (ME) providing all required hard- and software to gain access to the network and a UMTS Subscriber Identity Module (USIM). In other words the UE is a 3G enabled cell phone. • UTRAN (UMTS Terrestrial Radio Access Network): The major change of UMTS compared to second generation systems like GSM is the radio access technology. Instead of the classical GSM BSS (Base Station Subsystem) using TDMA/FDMA radio access there is now UTRAN utilizing CDMA (Code Division Multiple Access). UTRAN currently comes in three different flavours – FDD mode, TDD mode and low chip rate TDD mode. (This script focuses on FDD mode). • CN (Core Network): The core network is the same for GSM and UMTS. It is responsible to provide telecommunication services like mobility handling, circuit switched call services, packet switched data services and messaging service. The CN can be split into domains – the CS domain and the packet switched domain. Several signalling protocols provide the communication facilities between these subsystems. To establish the basic communication links (access links) between UE-UTRAN and UTRAN-CN there are access signalling protocols between these subsystems. On the other hand for telecom services there are protocols between UE and CN for mobility management, CS call management, PDP context management, SMS, etc. These protocols belong to the so called nonaccess signalling protocols. These non-access protocols are exchanged between UE and CN directly. UTRAN must transparently pass signalling messages from non-access signalling protocols from UE to CN and vice versa. Obviously there are also protocols inside UTRAN and inside CN. These are labelled intra-UTRAN or intra-CN protocols respectively. 5 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1. Network Architecture 1.2. Network Elements and Interfaces 6 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.2. Network Elements and Interfaces Node B Iub RNC Iu-CS MSC/VLR Server#1 CS MGW #1 Iub Uu Node B Iur MSC/VLR Server#N ... UE Node B Iub RNS RNC Iu-PS CS MGW #K CS-CN SGSN #1 RNS BTS BSC A ... Iu-PS SGSN #L BSS 7 June 1, 2005 CONFIDENTIAL - DRAFT Gb PS-CN Alexander Seifarth 1.2. Network Elements and Interfaces UTRAN is composed of two different network elements: • RNC (Radio Network Controller): The RNC is responsible for all radio management tasks inside of UTRAN. This includes channel allocation/modification/removal, handover procedures, security functions, etc. • Node B: The Node B serves one or more cells. The tasks of the Node B is to terminated the physical layer (WCDMA FDD) and convert it to the transport protocol on the Iub interface towards RNC. In other words the Node B is a relay point. Anything above the radio physical layer must pass transparently through the Node B. Between RNC and Node B there is the Iub interface. Its task is to transfer data (user data, signalling) between UE and RNC. Furthermore there is an optional interface Iur between two RNC. The Iur interface is related to soft handover procedures. This interface is similar to the Iub interface used for transparent transfer of data between UE and the so called serving RNC. For the connection between UTRAN and CN there is the Iu interface defined. It comes in two different versions – Iu-CS for the connectivity between RNC and MSC (MSC server, CS Media Gateway MGW) and Iu-PS for RNC-SGSN communication. The Iu interfaces shall transfer user data (CS speech calls, CS data calls, PDP context data), non-access signalling to and from the UE and access signalling between RNC and MSC/SGSN. Iu, Iub and Iur interfaces are currently based on ATM as transport layer technology, but also IP may be used. The IP based UTRAN is already specified. In parallel to UTRAN the classical GSM BSS may still be used together with UTRAN. Thus the core network still provides connectivity for A and Gb interface. Note that in future releases also the GSM BSS may be based on Iu interfaces rather than the old second generation protocols. 8 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.2. Network Elements and Interfaces MSC Server Iu-CS CS-MGW SGSN Iu-PS Serving RNC Serving RNC Iur Drift RNC Drift RNC • relay between Iur and Iub • splitting/combining function [optional] • local admission control • radio management (handover decision, channel de/allocation • NAS message relay • Iu management • backward error correction • splitting/combination function • local and global admission control Iub Node B Iub Node B Iub Node B UE 9 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.2. Network Elements and Interfaces A UE can be in one of two states: • IDLE: A UE in IDLE mode has no connectivity to UTRAN, in other words there is no signalling relation with an RNC and of course no radio resources are allocated for the UE. • CONNECTED: A CONNECTED mode UE has a signalling relation with an RNC which performs all radio management tasks for this UE. This special RNC is called the serving RNC (S-RNC) for the UE. A single UE has in CONNECTED mode exactly one serving RNC, in IDLE mode there is no serving RNC for the UE. During soft handover procedures it can happen, that a UE is connected with a cell that does not belong to the serving RNC’s area. The RNC managing this cell is called a drift RNC (D-RNC). A D-RNC must have an Iur interface to the serving RNC of the UE. The drift RNC must not perform radio management procedures for the UE, this is task of the serving RNC. The drift RNC provides functionality to relay data between serving RNC and UE. In other words the drift RNC is a Iub/Iur relay. In some RNC equipment also functionality to combine and split data streams to/from a UE during soft handover can be provided. 10 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1. Network Architecture 1.3. UTRAN/UE Main Functional Protocols Overview 11 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.3. UTRAN/UE Main Functional Protocols WCDMA WCDMA UE Uu Node B NBAP ALCAP NBAP ALCAP Iub RNC RANAP RANAP ALCAP ALCAP MSC/VLR Server Iu-CS CS-MGW Iu-CS Uu RRC RRC Iub ALCAP RNSAP ALCAP RNSAP Iur SGSN Iu-PS RNC RANAP RANAP 12 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.3. UTRAN/UE Main Functional Protocols There are some main functional protocols within UTRAN that implement the UMTS specific operations. These protocols are: • RRC (Radio Resource Control): The RRC protocol is exchanged between UE and serving RNC. It provides functions for radio channel management, handover, security functions, measurements, etc. • RANAP (Radio Access Network Application Part): RANAP is the main protocol on the Iu interfaces. MSC server and SGSN use RANAP signalling messages to allocated radio access bearers and to handle relocation of the serving RNC. • NBAP (Node B Application Part): NBAP is the control protocol on the Iub interface. It allows the RNC to command the Node B to allocate or delete channels on the air interface, to transport Node B measurements to the RNC. Although there is a detailed specification of NBAP, most of all available UTRAN equipment implements a propriety version of NBAP. • RNSAP (Radio Access Network Application Part): RNSAP is used on Iur interface, thus it is an open protocol. The RNSAP protocol extends the NBAP protocol, so that a serving RNC can allocate radio resources on cells owned by a drift RNC. Some other functions of RNSAP concern the relocation of the serving RNC function and packet data forwarding from old to new RNC over Iur. The mentioned protocols RRC, NBAP, RANAP, RNSAP are UTRAN specific protocols. On Iub, Iur and Iu-CS interfaces realtime data streams will be transported. Thus before such a real-time data stream can be transferred, an appropriate transmission bearer must be allocated on the transport network, this requires another protocol: • ALCAP (Access Link Control Application Part): The term ALCAP is a generic “placeholder” for a transport network specific control protocol to allocate transport bearers for delay sensitive data. In case of ATM-AAL2 transport network the ACLAP is the ITU-T protocol Q.2630 (AAL type 2 signalling protocol). If IP/UDP is used instead, the ALCAP is not defined, because in IP/UDP there is no resource allocation defined. 13 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.3. UTRAN/UE Main Functional Protocols NAS Signalling Relay MM MM UE RNC CC CC SS SS SMS SMS MSC/VLR Server CS data CS data CS-MGW RNS GMM GMM SM SM SMS SMS SGSN PS data PS data 14 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.3. UTRAN/UE Main Functional Protocols The non-access signalling protocols between UE and MSC server/SGSN are the direct transfer application part (DTAP) protocols known from GSM/GPRS. For the CS services there are: • MM (Mobility Management): This protocols provides location area update, authentication, IMSI detach procedures and some others (e.g. identity request, MM information). • CC (Call Control): Here we find mobile originated and mobile terminated call setup, local and remote call release, as well as call related supplementary services, mid-call modification and DTMF interaction. • SS (Supplementary Services): This protocol allows to trigger non-call related supplementary services like USSD, management of call forwarding and call barring, etc. For PS core network the following protocols are used: • GMM (GPRS Mobility Management): This protocol defines GPRS attach, GPRS detach, routing area update, authentication, service request and some other procedures (e.g. identity request, GMM information). • SM (Session Management): The SM protocol provides the functionality for PDP context activation, PDP context deactivation and PDP context modification. For PS and CS core network domain the short messaging service is possible. The protocols for SMS are identical for both domains: • SMS (Short Message Service): The SMS protocol suite consists of SM-CP (Short Message Control Protocol), SM-RP (Short Message Relay Protocol), SM-TL (Short Message Transfer Layer) and SM-AL (Short Message Application Layer). 15 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1. Network Architecture 1.4. UTRAN Protocol Stacks on Iux Interfaces 16 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.4. Protocol Stacks on Iux Interfaces – Iu-CS Serving RNC Iu-CS (control plane) MSC/VLR Server CS-MGW Iu-CS (user + transport network control plane) Control Plane MM MM CC CC SS SS SMS SMS Transport Network Control Plane ALCAP ALCAP User Plane CS call data Iu Iu UP . . . UP Iu Iu UP UP Iu Iu UP . . . UP Iu Iu UP UP RANAP RANAP SCCP SCCP MTP3B MTP3B SAAL SAAL PVC SAAL SAAL PVC ... SAAL SAAL PVC AAL2 AAL2 PVC ... AAL2 AAL2 PVC ATM ATM 17 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.4. Protocol Stacks on Iux Interfaces – Iu-CS On the Iu-CS interface the main functionality is to transfer CS call (speech, video, data) between RNC and CS media gateway (CS-MGW). CS user data is carried over the Iu UP (Iu User Plane) protocol from RNC to CS-MGW and vice versa. The Iu UP protocol supports codecs with multiple data rate modes like the AMR codec. Each application has its own Iu UP instance which is carried as AAL2 call inside a AAL2 virtual channel. To allocate AAL2 calls inside a AAL2 virtual channel the establishment procedure of the ALCAP protocol (Q.2630) must be used. In the same way when the application terminates, the associated AAL2 call must be released by ALCAP’s release procedure. Thus the ALCAP protocol is required between RNC and CS-MGW. The UMTS specific higher layer control of radio access bearers the AAL2 call belongs to the RANAP protocol is used. RANAP uses the SCCP (Signalling Connection Control Part) for virtual signalling connection between RNC and MSC server to identify a single UE. For signalling message transfer MTP3B (Message Transfer Part level 3 Broadband) is used. This is commonly known as broadband or high speed SS7. MTP3B provides routing facilities between RNC, MSC server and CS-MGW. The transmission is done on one or more high speed SS7 signalling links. Such high speed links are provided via SAAL (Signalling ATM Adaptation Layer) protocol instances. Each SAAL represents one ATM virtual channels together with retransmission functionality to increase transmission reliability. The non-access signalling protocol for the circuit switched side (MM, CC, SS, SMS) are carried over RANAP. 18 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.4. Protocol Stacks on Iux Interfaces – Iu-PS Serving RNC Iu-PS (control plane, user plane) SGSN Control Plane GMM GMM SM SM SMS SMS User Plane PS call data (PDP Contexts) ... RANAP RANAP SCCP SCCP MTP3B MTP3B SAAL SAAL PVC GTP-U GTP-U UDP UDP IP IP SAAL SAAL PVC SAAL SAAL PVC ... AAL5 AAL5 PVC ... AAL5 AAL5 PVC ATM ATM 19 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.4. Protocol Stacks on Iux Interfaces – Iu-PS On Iu-PS user data consists of PDP context packets. PDP context data is transferred over the GTP-U (GPRS Tunnelling Protocol – User plane). GTP-U provides so called GTP-U tunnels which are used to identify subscriber and PDP context and to route PDP context data correspondingly. The GTP-U protocol uses IP/UDP as transport layer. The IP layer routes between RNC and SGSN. In an ATM environment IP is transmitted over one or more AAL5 virtual channels. The control stack is similar to Iu-CS. The RANAP protocol is used between SGSN and RNC to allocate radio access bearer services for PDP contexts. There is no ALCAP on Iu-PS because AAL2 is not used here. Obviously the non-access signalling protocols on Iu-PS are different to Iu-CS. Between RNC and SGSN we can find GMM, SM and SMS on RANAP. 20 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.4. Protocol Stacks on Iux Interfaces – Iub UE Uu Node B Iub RNC Control Plane Transport Network Control Plane NBAP NBAP User Plane Transport Channel Data TrCH TrCH TrCH TrCH FP ... FP FP FP TrCH TrCH ... FP FP ALCAP ... ALCAP ALCAP ALCAP SAAL SAAL PVC SAAL SAAL ... PVC SAAL SAAL PVC SAAL SAAL ... PVC AAL2 AAL2 PVC AAL2 AAL2 ... PVC ATM ATM 21 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.4. Protocol Stacks on Iux Interfaces – Iub On the Iub interface data (user data and signalling) to and from the UE must be transported transparently. This UE-RNC is data is transferred in form of so called transport channels TrCH. Each transport channel is carried over Iub in a Frame Protocol (FP). Each such frame protocol FP uses a single AAL2 call inside a AAL2 virtual channel as transport resource. To allocate a AAL2 call for a frame protocol instance, again the ALCAP protocol is required. The ALCAP is carried over a single SAAL ATM virtual channel. Dependent on the RNC/Node B vendor also one or several ALCAP instances might be used on Iub. The main protocol on Iub, the NBAP protocol, may also be split into several parts. Again this depends on the equipment vendor. Thus one or more SAAL ATM virtual channels are required to transfer NBAP messages over the Iub interface. 22 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.4. Protocol Stacks on Iux Interfaces – Iur UE Uu Node B Iub Drift RNC Iur Serving RNC Control Plane RNSAP RNSAP SCCP SCCP Transport Network Control Plane ALCAP ALCAP User Plane Transport Channel Data TrCH TrCH TrCH TrCH FP ... FP FP FP TrCH TrCH ... FP FP MTP3B MTP3B SAAL SAAL SAAL SAAL PVC PVC SAAL SAAL ... PVC AAL2 AAL2 PVC AAL2 AAL2 ... PVC ATM ATM 23 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.4. Protocol Stacks on Iux Interfaces – Iur The Iur interface is comparable to Iub with two differences. First instead of NBAP the RNSAP protocol is used. The second difference is that RNSAP and ALCAP use broadband SS7 for transfer and routing of signalling messages between serving RNC and drift RNC. 24 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2. Radio Protocol Architecture and Channels 25 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2. Radio Protocol Architecture and Channels 2.1. Radio Protocol Architecture 26 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.1. Radio Protocol Architecture NAS Protocols MM GMM SM MM GMM SM CC CC SS SMS SS SMS CS CS App App RRC RRC ... #1 ... RAB #y2 PS PS PDP Ctx. PDP Ctx. RAB #y CB CB SMS SMS App App Radio Bearer (RB) #x #y1 #z ... RLC RLC ... RLC RLC #1 #x PDCP PDCP RLC RLC #y2 BMC BMC RLC RLC #y1 RLC ... RLC RLC RLC #y #z Logical Channels (LogCH) Medium Access Control (MAC) Medium Access Control (MAC) Transport Channels (TrCH) #1 #2 WCDMA Physical Layer (FDD) WCDMA Physical Layer (FDD) Physical Channels (PhCH) CONFIDENTIAL - DRAFT #n #1 #k RF Alexander Seifarth 27 June 1, 2005 2.1. Radio Protocol Architecture The UMTS radio protocol architecture as it is implemented in the UE has the following protocols: • WCDMA Physical Layer: The physical layer offers bit transport services in form of so called transport channel TrCH. To transmit TrCH data over the air the physical layer has access to physical channels PhCH. A PhCH represents the physical resource and is identified by frequency, scrambling code and channelization code (plus some additional parameters for certain channels). • Medium Access Control (MAC): MAC protocol has the task to include or check UE identifiers on transport channels that are shared between several UE (common transport channels). The transport services are offered to higher layers in form of logical channels LogCH. Thus the MAC also has to multiplex and demultiplex logical channels onto or from transport channels. • Radio Link Control (RLC): To each logical channel there is one RLC instance. The RLC belongs to a single radio bearer (RB) which represents the transmission resource for a layer 3 application (codec, RRC protocol, PDP context). The RLC protocol offers reliability in form of sequence numbering and backward error correction. Typically one RLC belongs to one logical channel, but for acknowledged mode one RLC instance can also utilize two logical channels. • Packet Data Convergence Protocol (PDPC): This protocol is applicable for radio bearers belonging to PDP contexts only. The protocol performs IP header compression and optionally also IP datagram numbering. • Broadcast Multicast Control (BMC): This protocol exists only for cell broadcast SMS radio bearer. This protocol contains the scheduling messages and the basic CB SMS frames. • Radio Resource Control (RRC): The main signalling protocol for radio resource management. For a single application one or more radio bearers have to be allocated. For user applications all radio bearers of a single application are combined in a radio access bearer (RAB). 28 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2. Radio Protocol Architecture and Channels 2.2. Logical Channel Types and their Usage 29 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. Logical Channel Types and their Usage UE Identification in UTRAN UE Uu Node B Iub Serving RNC Case No UE Identification No UE Identification Layer 1 Identification Layer 1 Identification UE Identification in RNC Some information (System Information, CB SMS) does not require a UE identification. UE must have a dedicated physical resource. This resource uniquely identifies the UE for the time the resource is assigned to it. UE uses common resources and identifies itself with a special MAC header identifier (c-RNTI, u-RNTI, dschRNTI) on that resource. UE has no dedicated resource and no assigned MAC header identifier, but uses common resources (RRC signalling only). The RRC message must contain a UE identifier as layer 3 parameter. CONFIDENTIAL - DRAFT Layer 2 Identification Layer 2 Identification Layer 3 Identification Layer 3 Identification 30 June 1, 2005 Alexander Seifarth 2.2. Logical Channel Types and their Usage Logical Channel Types Control Channels BCCH BCCH PCCH PCCH CCCH CCCH DCCH DCCH Broadcast Control Channel [dl, ptm] Paging Control Channel [dl, ptm] Common Control Channel [ul+dl, ptp] Dedicated Control Channel [ul+dl, ptp] ptm: ptp: dl: ul: point-to-multipoint point-to-point downlink uplink System Information broadcast; downlink channel; no UE specific information Point-to-multipoint paging procedure (Paging Type 1) UE identification by RRC message itself Point-to-point RRC signalling on common resource when no MAC identifier available Point-to-point RRC signalling on common or dedic. resource with MAC identifier available (on common resource) Traffic Channels DTCH DTCH CTCH CTCH 31 June 1, 2005 Dedicated Traffic Channel [ul|dl|ul+dl, ptp] Common Traffic Channel [dl (currently), ptm] Point-to-point data (CS data, CS speech, PS data) on common or dedicated resource (requires MAC-ID on common resource). Used for cell broadcast SMS. Thus no UE-ID. Alexander Seifarth CONFIDENTIAL - DRAFT 2.2. Logical Channel Types and their Usage For FDD mode the following logical channel types are defined: • BCCH (Broadcast Control Channel): The BCCH carries the cell’s system information, which are RRC messages (System Information Blocks, Master Information Block). The BCCH is not associated with a radio bearer. • PCCH (Paging Control Channel): The PCCH carries RRC messages ‘Paging Type 1’. This message type is used to page a UE or to indicate system information changes. Like the BCCH there is no radio bearer associated with the PCCH. • CCCH (Common Control Channel): The CCCH is a bi-directional RRC signalling channel where layer 3 identification is required. The UE uses CCCH signalling at the beginning of communication when no DCCH is available. Only radio bearer RB 0 is attached to CCCH. RB 0 is configured via system information, because it works as a start up point. • DCCH (Dedicated Control Channel): The normal bi-directional RRC signalling and also rate control signalling is exchanged on a DCCH. Every DCCH is associated with its own radio bearer which must be configured via explicit RRC signalling from RNC to UE. On DCCH only layer 1 or layer 2 identification is allowed. • DTCH (Dedicated Traffic Channel): CS call data (speech, video, data) as well as PDP context data is carried over DTCH. Like for DCCH also on DTCH layer 1 or layer 2 identification is required, layer 3 identification is not possible. • CTCH (Common Traffic Channel): This channel type is currently used for cell broadcast SMS (CB SMS) only. It should be obvious that any DTCH or CTCH requires an associated radio bearer. Such radio bearers are granted via RRC procedure from the RNC to the UE. 32 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2. Radio Protocol Architecture and Channels 2.3. Transport Channel Types and their Usage 33 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.3. Transport Channel Types and their Usage Dedicated TrCH • mapped onto dedicated physical resources • only one UE can use the physical resource • automatically provides Layer 1 identification for the UE assigned to the channel • used with DCCH and DTCH Node B Common TrCH • mapped onto shared physical resources • multiple UE can be assigned to same physical resource • requires Layer 2 identification for DCCH, DTCH • requires Layer 3 identification for CCCH, PCCH [opt] WCDMA FDD cell common physical channel dedicated physical channels Common TrCH Common TrCH Dedicated TrCH Dedicated TrCH Dedicated TrCH Dedicated TrCH UE UE 34 Dedicated TrCH Dedicated TrCH June 1, 2005 CONFIDENTIAL - DRAFT Common TrCH Common TrCH UE Alexander Seifarth 2.3. Transport Channel Types and their Usage 1 Transport Channel Types Common Channels BCH BCH PCH PCH RACH RACH FACH FACH DSCH DSCH CPCH CPCH HS-DSCH HS-DSCH 35 June 1, 2005 dl: ul: downlink uplink Broadcast Channel [dl, 1/cell] Paging Channel [dl, ≦16/cell] Random Access Channel [ul, ≦16/cell] Forward Access Channel [dl, ≦16/cell] Downlink Shared Channel [dl, ≦?/cell] Common Packet Channel [ul, ≦64/cell] High Speed DSCH [dl, ≦16/cell] Carries BCCH. Carries PCCH. Can carry CCCH, DCCH and DTCH. Minimum SF is 32 and maximum transmission time is 10|20 ms. Can carry CCCH, DCCH, DTCH, BCCH and CTCH. Minimum SF is 4. Carries DCCH and DTCH. A DSCH is always used together with one or more DCH. Carries DCCH and DTCH. Minimum SF is 4 and maximum transmission time is 80 ms. Carries DCCH and DTCH. Can switch between QPSK and 16QAM on physical channel. CONFIDENTIAL - DRAFT Alexander Seifarth 2.3. Transport Channel Types and their Usage 2 Transport Channel Types Dedicated Channels DCH DCH Dedicated Channel [ul|dl] One DCH can carry one or more DCCH or one DCH can carry one or more DTCH. 36 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.3. Transport Channel Types and their Usage A single transport channel has a certain characteristics that describes how bits are transmitted over the air interfaces. This concerns bit rate, delay and reliability. A special characteristics is whether the associated physical channel used for transport channel data transmission is dedicated to a single UE or must be shared between several UE. This means that we have two groups of transport channels – dedicated TrCH and common TrCH. Common transport channels are created during cell setup or O&M triggered cell reconfiguration. In UMTS FDD mode we have the following common transport channels: • BCH (Broadcast Channel): There is exactly one BCH per cell and it is used to carry BCCH. The format of a BCH is fixed by specification so that any UE camping on a cell can read the BCH. • PCH (Paging Channel): A PCH carries PCCH. A cell may have up to 16 PCH by specification. A UE selects a PCH depending on subscriber identity. • RACH (Random Access Channel): The random access channel is used to carry CCCH, DCCH, DTCH in the uplink. In case of CCCH any UE in the cell can freely access the RACH, for DCCH/DTCH a UE has to get permission from the RNC to do so. Especially it is so that for DCCH/DTCH on RACH the UE needs a temporary identifier (C-RNTI) for layer 2 identification. • FACH (Forward Access Channel): The FACH is the downlink response channel to the RACH. It is used to carry CCCH, DCCH, DTCH, CTCH and BCCH. For DCCH/DTCH on FACH the already mentioned C-RNTI is required. Note that there is no fixed timing relationship between transmission on RACH and reception on FACH. Rather a UE that uses RACH/FACH the FACH must be monitored permanently. • CPCH (Common Packet Channel): The CPCH is working like the RACH, but is used for DCCH and DTCH only. Compared to the RACH the CPCH allows higher bit rates and longer transmission periods – thus a higher throughput can be achieved on CPCH. 37 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.3. Transport Channel Types and their Usage • DSCH (Downlink Shared Channel): The downlink shared channel shall be used for packet data in the downlink. The channel allows multiplexing of DCCH/DTCH of several UE using time and code multiplexing mechanisms. This shall increase resource usage efficiency. • HS-DSCH (High Speed Downlink Shared Channel): This channel is one of the new features in UMTS Release 5. The HS-DSCH has the same function like the normal DSCH. DCCH/DTCH of several UE shall be multiplexed – again time and code multiplexing is used. The special thing is, that the physical resource allocation and the multiplexing is handled at the Node B, not at the RNC. Furthermore the associated physical channel allows switch between QPSK and 16QAM. In contrast to this the dedicated transport channels which are assigned to a single UE will be created and deleted during normal operation using NBAP/RNSAP- and RRC-procedures. There is only one dedicated transport channel type defined: • DCH (Dedicated Channel): The dedicated channel carries either several (or one) DCCH or several (or one) DTCH. Obviously several logical channels on a DCH belong to the same UE. Thus the DCH is the only case where layer 1 identification is in use. A UE can have several DCH simultaneously. A single DCH is either uplink or downlink. 38 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2. Radio Protocol Architecture and Channels 2.4. Physical Channels and their Usage 39 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.4. Physical Channels and their Usage 1 Physical Channel Types Synchronisation Channels P-SCH P-SCH S-SCH S-SCH Primary Synchr. Channel [dl, 1/cell] dl: ul: downlink uplink Transmits Primary Synchr. Code (PSC) to detect cell. Secondary Synchr. Channel Transmits a Secondary Synchr. Code sequence to identify scrambling code group and radio frame start. [dl, 1/cell] Measurement Reference Channels P-CPICH P-CPICH S-CPICH S-CPICH Primary Common Pilot CH [dl, 1/cell] Secondary CPICH [dl, 0...15/cell] Transmits a pre-defined symbol sequence (all –1) with the primary dl scrambling code of the cell. Transmits a pre-defined symbol sequence with one the 15 possible secondary scrambling codes of cell. System Information Broadcast P-CCPCH P-CCPCH 40 June 1, 2005 Primary Common Control Physical Channel [dl, 1/cell] Carries BCH with BCCH. Always scrambled by primary dl scrambling code of the cell. Alexander Seifarth CONFIDENTIAL - DRAFT 2.4. Physical Channels and their Usage 2 Physical Channel Types PhCH for FACH and PCH S-CCPCH S-CCPCH PICH PICH Secondary Common Control Physical Channel [dl, ≦ 16/cell] Paging Indicator Channel [dl, ≦ 16/cell] dl: ul: downlink uplink Carries either 1) FACH only, 2) PCH only or 3) FACH + PCH multiplexed. Contains paging indicators for discontinuous reception (DRX) in association with a PCH. PhCH for RACH PRACH PRACH AICH AICH Physical Random Access Channel [ul, ≦ 16/cell] Acquisition Indicator Channel [dl, ≦ 16/cell] Consists of a preamble part to perform open loop power control and a data part transferring RACH data. Associated with a single PRACH. Carries the preamble responses (acquisition indications). 41 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.4. Physical Channels and their Usage 3 Physical Channel Types PhCH for DCH DPCH DPCH DPCCH DPCCH DPDCH DPDCH Dedicated Physical Channel Carries one or several DCH of a single UE and [dl, dynamical allocation] physical layer information (TPC, pilot bits, TFCI). Data rate ≦1860 kpbs (SF=4). [Physical channel bit rate] Dedicated Physical Ctrl CH [ul, dynamical allocation] [ 1/UE] dl: ul: downlink uplink Carries physical layer information from a single UE to Node B (TPC, pilot bits, TFCI, FBI). SF=256 fix. Dedicated Physical Data CH Carries one or several DCH of a single UE to Node B. [ul, dynamical allocation] Data rate ≦ 960 kpbs (SF=4). [Physical channel bit rate] [≦6/UE] PhCH for DSCH PDSCH PDSCH DPCH DPCH 42 June 1, 2005 Physical Downlink Shared Channel [dl, dynamical allocation of codes] Carries a DSCH with DCCH/DTCH of several UE multiplexed by time and channelization codes. Data rate ≦ 1920 kbps (SF=4).[Physical channel bit rate] UE. The DPCH contains physical layer control bits. Dedicated Physical Channel A PSDCH must be used by together with DPCH by a [dl, dynamical allocation] CONFIDENTIAL - DRAFT Alexander Seifarth 2.4. Physical Channels and their Usage 4 Physical Channel Types PhCH for CPCH PCPCH PCPCH Physical Common Packet Channel [ul] dl: ul: downlink uplink Carries CPCH with DCCH/DTCH of several UE multiplexed by time (asynchronous) and CPCH access preambles, collision detection preambles and power control preambles. Data rate ≦960 kpbs (SF=4) for max. 80 ms. Gives positive or negative acquisition indications to CPCH access preambles for CPCH access preambles. Gives collision indications or channel assignment indications (code alloc.) for CPCH collision preambles. Gives status indications about availability/nonavailability of CPCH resources. Carries physical layer control bits (TPC) used for closed loop power control of PCPCH. AP-AICH AP-AICH Access Preamble Acquisition Indicator CH [dl] CD/CA-ICH Collision Detection/ CD/CA-ICH Channel Assignment Indicator Channel [dl] CSICH CSICH DPCH DPCH CPCH Status Indicator CH [dl] Dedicated Physical CH [dl] 43 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.4. Physical Channels and their Usage 5 Physical Channel Types PhCH for HS-DSCH HS-PDSCH HS-PDSCH High Speed Physical Downlink Shared Channel [dl, ≦ 15/cell] dl: ul: downlink uplink =480 kbps (QPSK). Carries a HS-DSCH with DCCH/DTCH of several UE. Fixed spreading factor 16. Up to 15 HS-PDSCH may be used in parallel. Can switch between QPSK and 16QAM. Single HS-PDSCHData rate =960 kpbs (16QAM) and On this channel the physical layer assigns a UE the HS-PDSCH for the next transmission period. HS-SCCH HS-SCCH HS-DPCCH HS-DPCCH HS-DSCH related Shared Control Channel [dl, ≦4 per HS-DSCH] Transmits quality indicator (C/I) and Dedicated Physical CH [ul, 1 per UE on HS-DSCH] acknowledgements for received data on HS-PDSCH from UE to Node B. 44 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2. Radio Protocol Architecture and Channels 2.5. Radio Bearers (RB) and Radio Access Bearers (RAB) 45 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.5. RB and RAB - Architecture UE Serving RNC MSC Server R R C A M R PDP Ctx. 1 PDP Ctx. 2 RB 1 RB 2 RB 3 RB 4 RB 5 R R C Rate control CS-MGW RAB (CS) RAB subflow 1 RAB subflow 2 RAB subflow 3 A B C RB 6 RB 7 RB 8 AMR A B C Iu UP Iu UP RAB (PS) RB 9 PDP Context 1 PDP Context 2 RAB (PS) SGSN June 1, 2005 CONFIDENTIAL - DRAFT 46 Alexander Seifarth 2.5. RB and RAB - Architecture Transmission resources for telecommunication services in UMTS are handled on several levels – each network subsystem is responsible for its own resources. This allows to handle transmission resources on different time scales. As shown in the section about the radio protocol architecture within UTRAN each application uses one or more so called Radio Bearers (RB). Radio bearers are used for signalling (RRC protocol messages, rate control signalling) as well as for user data applications (CS calls, PDP contexts). But user data applications have to be terminated by the core network. Thus for each active application the core network establishes one so called Radio Access Bearer (RAB). A RAB can be considered as a virtual transmission resource between UE and CN. Depending on the application a single RAB can utilize one or more radio bearers. For PDP contexts it is even possible to have a RAB without radio bearer. Note that a PDP context can be active with and also without radio access bearer. The SGSN removes or reallocates the RAB by timer supervision. Whereas the radio bearers are removed and reallocated by the RNC also by timer supervision. 47 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.5. RB and RAB – RRC Radio Bearer Usage NAS Protocols MM GMM SM MM GMM SM high priority signalling transfer CC CC SS SMS SS SMS low priority signalling transfer RRC RRC RB 0 (UL:TM; DL:UM) RB 1 (UL/DL:UM) RB 2 (UL/DL:AM) RB 3 (UL/DL:AM) RB 4 (UL/DL:AM) RLC RLC RLC RLC RLC CCCH DCCH 1 DCCH 2 DCCH 3 DCCH 4 MAC MAC DL-TrCH PHY PHY 48 June 1, 2005 UL-TrCH CONFIDENTIAL - DRAFT Alexander Seifarth 2.5. RB and RAB – RRC Radio Bearer Usage The RRC protocol has to use radio bearers for the transmission of its signalling messages. The very first radio bearer RB 0 is special, because it is configured via system information (BCCH) and acts as a start up item for signalling. RB 0 is always mapped to CCCH and is thus found on RACH and FACH. For normal signalling (DCCH) there are RB 1, RB 2, RB 3 and RB 4. RB 1 and RB 2 are used for radio management procedures only, whereas RB 3 and RB 4 are to be used for non-access signalling (CN procedures). The difference between RB 1 and RB 2 is the mode of the associated RLC protocol instance. RB 1 is always running with unacknowledged mode, RB 2 always uses acknowledged mode. RB 3 and RB 4 have to use acknowledged mode, their difference is the priority. RB 3 is for high priority CN signalling (MM, GMM, SM, CC, SS). In contrast to that RB 4 is for low priority signalling (SMS). 49 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2. Radio Protocol Architecture and Channels 2.6. Channel Configuration Scenario 50 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.6. Channel Configuration Scenario UE with one variable rate AMR CS call, 1 PDP context (active data transfer) MM, GMM, CC, SS, SM, SMS MM, GMM, CC, SS, SM, SMS AMR codec AMR codec PDP Ctx. PDP Ctx. RB 8 RB 9 PDCP RRC RRC RB 1 RB 2 RB 3 RB 4 A RB 5 B RB 6 C frame header RB 7 RLC UM DCCH 1 AM DCCH 2 AM DCCH 3 AM DCCH 4 TM DTCH 1 TM DTCH 2 TM DTCH 3 TM DCCH 5 UM|AM DTCH 5 MAC DCH #31 PHY DL 51 June 1, 2005 DCH #0 DCH #1 DCH #2 DCH #3 DCH #4 DPCH DPCCH DPDCH UL Alexander Seifarth CONFIDENTIAL - DRAFT 2.6. Channel Configuration Scenario The scenario shown here presents the configuration of a UE in UTRA connected mode with two services running: • one AMR speech call with variable bit rate, • one PDP context with active data transfer. The UE uses several radio bearers RB1, …, RB4 for RRC signalling. Obviously these radio bearers are DCCH. For the AMR codec also four radio bearers are required. RB 5, …, RB 7 carry the encoded speech data in form of the codec’s A, B and C bits. Every 20 ms the codec produces one set of A, B and C bits. Together with the codec frame header which are mapped to RB 8 they form the AMR codec frame. The frame header is essential for rate control of AMR codecs. For the PDP context there is at most one radio bearer RB 9 required. RB 5, 6, 7 and 9 are mapped to DTCH, whereas the radio bearer RB 8 for the AMR codec frame header is DCCH. All RRC signalling radio bearers RB 1, …, RB 4 are multiplexed onto the same DCH (UL-DCH + DL-DCH). RB 5, 6, 7 and 8 belong to the codec but require different reliability settings. Thus they are mapped each to their own DCH (UL/DL). The same is true for the PDP context’s radio bearer RB 9, it also gets its own DCH. On the physical layer all DCH can be multiplexed to a single DPDCH in the uplink and a DPCH in the downlink. If the data rate exceeds the capacity of single DPDCH or DPCH, several physical channels might be used in parallel. 52 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth Module 02 Radio Layer 2 Protocols MAC, RLC, PDCP Version 0.0.1 (10/02/2005) Author: Alexander Seifarth ([email protected]) 1 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1. Transport Channel Configuration 2 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1. Transport Channel Configuration 1.1. Transport Formats (TF) and Transport Format Sets (TFS) 3 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.1. TF and TFS – Transport Blocks and Format MAC MAC TrCH x PHY PHY Transport Block Set TBS Transport Block Set TBS Transmit Time Interval TTI Transport Block Set TBS Transport Block TB #0 Transport Block TB #1 ... Transport Block TB #N-1 Transport Format (TF) channel coding algorithm CRC size rate matching attribute Transmit Time Interval TTI Transport Block Set TBS time 4 June 1, 2005 CONFIDENTIAL - DRAFT TTI TB size (no. of bits) TBS size (no. of TB in TBS) Alexander Seifarth 1.1. TF and TFS – Transport Format Sets Transport Format Set (TFS) channel coding algorithm CRC size rate matching attribute TTI TBS size #0 TBS size #1 TB size #0 TB size #1 TB size #K-1 ... TBS size #K-1 TFI 0 1.1.1.1.9 1.1.1.1.9.1 |1.1.1.1.9.1.1 |1.1.1.1.9.1.2 1.1.1.1.9.1.3 1.1.1.1.9.1.3.1 1.1.1.1.9.1.3.1.1 1.1.1.1.9.1.3.1.1.1 1.1.1.1.9.1.3.1.1.1.1 1.1.1.1.9.1.3.1.1.1.1.1 1.1.1.1.9.1.3.1.1.1.1.1.1 |1.1.1.1.9.1.3.1.1.1.1.1.1.1 1.1.1.1.9.1.3.1.1.1.1.2 1.1.1.1.9.1.3.1.1.1.1.2.1 |1.1.1.1.9.1.3.1.1.1.1.2.1.1 1.1.1.1.9.1.3.1.1.1.1.3 |1.1.1.1.9.1.3.1.1.1.1.3.1 TFI 1 ul-AddReconfTransChInfoList uL-AddReconfTransChInformation ul-TransportChannelType transportChannelIdentity transportFormatSet dedicatedTransChTFS tti tti40 dedicatedDynamicTF-Info rlc-Size octetModeType1 sizeType1 numberOfTbSizeList numberOfTransportBlocks zero logicalChannelList allSizes CONFIDENTIAL - DRAFT TFI K-1 | | | | | | | | | | | | | | | | | | | |-----0-|***b5*** | | | | | | | |***b5*** | | | | | 5 June 1, 2005 |dch |32 |16 |0 |0 Alexander Seifarth 1.1. TF and TFS – Transport Format Sets | | | |10000--| | | | | | | |1------|***b8*** |-011---1.1.1.1.9.1.3.1.1.1.2 1.1.1.1.9.1.3.1.1.1.2.1 1.1.1.1.9.1.3.1.1.1.2.1.1 |1.1.1.1.9.1.3.1.1.1.2.1.1.1 1.1.1.1.9.1.3.1.1.1.2.2 1.1.1.1.9.1.3.1.1.1.2.2.1 |1.1.1.1.9.1.3.1.1.1.2.2.1.1 1.1.1.1.9.1.3.1.1.1.2.3 |1.1.1.1.9.1.3.1.1.1.2.3.1 1.1.1.1.9.1.3.1.2 1.1.1.1.9.1.3.1.2.1 |1.1.1.1.9.1.3.1.2.1.1 |1.1.1.1.9.1.3.1.2.2 |1.1.1.1.9.1.3.1.2.3 dedicatedDynamicTF-Info rlc-Size octetModeType1 sizeType1 numberOfTbSizeList numberOfTransportBlocks one logicalChannelList allSizes semistaticTF-Information channelCodingType convolutional rateMatchingAttribute crc-Size | | | | | | | | | | | | | | |16 |0 |0 |third |185 |crc16 6 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.1. TF and TFS – Transport Format Sets Each transport channel has to be configured with a set of transport characteristics that control the data transmission within the channel. Data transmission within a transport channel is organized in so called transport blocks (TB). A single transport block TB contains data from one logical channel. Zero, one or more of these transport blocks (also from different logical channels) are assembled in a single transport block set (TBS). One TBS has to be transmitted every transmission time interval (TTI), which can be 10 ms, 20 ms, 40 ms or 80 ms. The configuration of a single transport channel has to configure the TTI, TB size (bits or octets) and TBS size (in number of transport blocks). Every transport block TB gets in the physical layer its own cyclic redundancy check (CRC). The size of the CRC (CRC Size) which can be 0 bits, 8 bits, 12 bits, 16 bits or 24 bits, is a transport channel configuration parameter too. The transport blocks together with their CRC are channel coded with either a ½ convolutional coding, 1/3 convolutional coding or a 1/3 turbo coding. The type of channel coding is also part of the TrCH configuration parameter. A problem of code division multiple access using OVSF channelization code tree is that the number of bits after channel coding must be adapted to the physical layer frame size. This task is performed by the rate matching function. When too many bits are coming from the channel encoder a puncturing algorithm will be used to reduce the number of bits, when too less bits are available some bits will be repeated. The rate matching algorithm is configured with a single rate matching attribute. These parameters: TB size, TBS size, TTI, CRC size, Channel Coding and Rate Matching Attribute form a so called transport format (TF). A single TBS is transmitted with exactly one TF. Several transport formats TF can be configured in parallel for a single transport channel. All TF of a TrCH are called transport format set (TFS). The physical layer’s architecture requires that all TF of a TFS have the same settings for TTI, CRC size, Channel Coding and Rate Matching Attribute. Whenever a new TrCH shall be created it is the RNC that allocates a TFS for it. The TFS is sent to Node B via NBAP signalling. The UE gets the TFS either via System Information (BCCH) or via explicit RRC signalling on a CCCH or DCCH. 7 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1. Transport Channel Configuration 1.2. Transport Format Combinations TFC 8 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.2. Transport Format Combinations TFC TFS (TrCH 1) MAC MAC TrCH 1 TrCH 2 TFS (TrCH 2) TFI 0 TFI 1 0 kbps 8 kbps TFI 0 TFI 1 TFI 2 0 kbps 16 kbps 32 kbps PHY PHY TFCI TrCH 1 TrCH 2 Total TrCH Bit Rate 16 kbps 32 kbps 0 kbps 8 kbps 40 kbps 24 kbps Alexander Seifarth 0 1 2 3 blocked blocked TFI 0 TFI 0 TFI 0 TFI 1 TFI 1 TFI 1 TFI 1 TFI 2 TFI 0 TFI 0 TFI 2 TFI 1 CONFIDENTIAL - DRAFT 9 June 1, 2005 1.2. Transport Format Combinations TFC A UE can use several transport channels simultaneously. Each transport channel has its own set of transport formats assigned. This means at every time instant every transport channel transmits a TBS using a certain transport format. A set of one transport format for every configured transport channel is a transport format configuration (TFC). Which transport format combinations TFC are permitted is indicated by the RNC to the UE. One major function that uses TFC restrictions is the admission control, because in the end effect each TFC is associated with a certain required transmission power. 10 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2. Medium Access Control MAC 11 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2. Medium Access Control MAC 2.1. MAC Entities 12 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.1. MAC Entities UE Node B NBAP MAC-b RNC NBAP BCH RACH, FACH, DSCH, CPCH,PCH MAC-b MAC-c/sh MAC-c/sh MAC-hs HS-DSCH MAC-hs MAC-d DCH MAC-d MAC-d 13 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.1. MAC Entities The MAC protocol is split into several entities: • MAC-b: This entity is responsible for broadcasting the system information downlink. The system information is assembled by the RNC at sent via NBAP messages to the Node B. From here the MAC-b sends this information periodically in the cell. • MAC-c/sh: MAC-c/sh has to manage all common transport and shared logical channels. For DCCH/DTCH on common transport channels this includes identification of the UE with help of special UE identifiers contained in the MAC header. • MAC-d: For DCH as well as DCCH/DTCH the MAC-d entities are responsible. MAC-b and MAC-c/sh are created once per cell, whereas MAC-d is available inside the UE and the serving RNC for each UE. For high speed downlink packet access a new MAC entity is introduced: • MAC-hs: This entity manages the high speed downlink shared channel HS-DSCH. It is implemented in the Node B and gets its data input from MAC-d (serving RNC) directly or indirectly via MAC-c/sh (drift RNC). MAC-hs is especially responsible to perform the scheduling of downlink packet data. 14 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2. Medium Access Control MAC 2.2. MAC – PDU, LogCH Identification, UE Identification on Layer 2 15 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. MAC-PDU, UE/LogCH Identification DCH case: DxCH #0 DxCH #1 DxCH #K-1 x = T(raffic) | C(ontrol) ... Transport Block Set TBS TB #0 (MAC-PDU #0) TB #1 (MAC-PDU #1) MAC-d MAC-d ... TB #L-1 (MAC-PDU #L-1) DCH #N MAC - PDU MAC Header MAC-SDU = LogCH Data (RLC PDU) PHY PHY DxCH – number (if K>1) 16 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. MAC-PDU, UE/LogCH Identification Common TrCH (RACH, FACH, DSCH, CPCH) case: CCCH BCCH| CTCH DxCH DxCH #0 #K-1 from MAC-d x = T(raffic) | C(ontrol) ... Transport Block Set TBS TB #0 (MAC-PDU #0) TB #1 (MAC-PDU #1) MAC-c/sh MAC-c/sh RACH | FACH | DSCH | CPCH ... TB #L-1 (MAC-PDU #L-1) MAC - PDU MAC Header MAC-SDU = LogCH Data (RLC PDU) PHY PHY LogCH Type DxCH – number (if K>1) UE-identifier (for DxCH only) CONFIDENTIAL - DRAFT 17 June 1, 2005 Alexander Seifarth 2.2. MAC-PDU, UE/LogCH Identification Common TrCH (HS-DSCH) case: DxCH #0 DxCH #1 DxCH #K-1 ... MAC-d MAC-d MAC-d - PDU MAC-d Flow MAC Header MAC-SDU = LogCH Data (RLC PDU) MAC-hs MAC-hs HS-DSCH MAC-hs Header LogCH Type DxCH – number (if K>1) MAC-hs PDU MAC-d PDU #0 ... MAC-d PDU #M-1 PHY PHY 18 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. MAC-PDU, UE/LogCH Identification Two major functions are provided by MAC protocol: • explicit UE identification on common transport channels, • multiplexing of logical channels onto/from transport channels. On a DCH the MAC frame provides in its header the DCCH or DTCH logical channel number if more than one logical channel is multiplexed onto the DCH. On common transport channels like RACH, FACH, DSCH, FACH or CPCH the MAC header indicates the type of logical channel that the transport block carries, the UE identity if the logical channel is DCCH or DTCH and if more than one logical channel of the same UE and of the same type is contained the logical channel number. For high speed downlink packet access a single UE can get one or more so called MAC-d flows on Iub interface. Each MACd flow corresponds to a so called re-ordering queue. The MAC-d PDU indicates to which logical channel (DTCH) the data belongs to. On the air interface the MAC-hs entity assembles several MAC-d PDU of the same user and bundles them in a MAC-hs PDU. In the MAC-hs PDU the re-ordering queue identity and a sequence number (for retransmission purposes) is contained. Furthermore size indicators for the contained MAC-d PDU are implemented into the MAC-hs PDU. 19 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. MAC-PDU, UE/LogCH Identification • MAC-PDU (non HS-DSCH) MAC Header MAC SDU TCTF UE-ID Type UE-ID C/T RLC PDU (LogCH Data) • MAC-d PDU (for HS-DSCH) MAC Header MAC SDU C/T • MAC PDU (HS-DSCH) MAC Header MAC-hs SDUs RLC PDU (LogCH Data) MAC-hs Header MAC-d PDU #0 MAC-d PDU #1 ... MAC-d PDU #N-1 Version Queue Seq.No. Flag ID TSN Size Index Id. #0 No. MAC-d PDUs #0 Flag #0 ... Size Index Id. #Y No. MAC-d PDUs #Y Flag #Y 20 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. MAC-PDU, UE/LogCH Identification MAC PDU UE MAC header UE identifier -- (no MAC UE ID) -- (no MAC UE ID) U-RNTI (32 bit) U-RNTI (32 bit) = S-RNC-ID + S-RNTI • UE uses CCCH/PCCH/BCCH/CTCH or DCH/HS-DSCH • UE uses DCCH/DTCH on RACH/FACH in a new cell • UE uses DCCH/DTCH on RACH/FACH/ CPCH (not after cell change) RNC C-RNTI (16 bit) C-RNTI (16 bit) DSCH-RNTI (16 bit) DSCH-RNTI (16 bit) • UE uses DCCH/DTCH on DSCH 21 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. MAC-PDU, UE/LogCH Identification • TCTF (Target Channel Type Field): Indicates logical channel type that is carried in the MAC header. • UE-ID/UE-ID type: Identifies a UE on common transport channels for DCCH or DTCH. The UE-ID can be u-rnti (umts – radio network temporary identifier), c-rnti (cell-rnti) or dsch-rnti. These identifiers must be allocated for a UE via RRC signalling before their use. • C/T (Channel of Type): If several logical channels of the same type are multiplexed onto the same transport channel, this field is used to distinguish and therefore demultiplex them. The following information elements are used in HS-DSCH frames only: • Version Flag: Currently always set to zero. May be used to allow MAC-hs extensions in future. • Queue ID: Indicates which re-ordering queue inside the UE the data belongs to. This enables independent buffer management for data of different applications. • TSN (Transmission Sequence Number): Sequence number for re-ordering purposes in case of disordering or retransmission. • SID (Size Index Identifier): Identifies the size of a number of consecutive MAC-d PDU (see next field). The SID is dynamically configured via higher layer signalling and is independent for each re-ordering queue. • Number of MAC-d PDU: Indicates the number of consecutive MAC-d PDU with the same SID. • Flag: If 0 then another SID fields follows, if 1 then the MAC-d PDU part starts after the flag. 22 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. MAC-PDU, UE/LogCH Identification • Example: MAC-PDU (Transport Block) | |0011---| | |----0--|-----000 | |0010---|**b12*** | |**b124** | | | 2.2 FP: Transport Block |2.2.1 MAC: C/T Field |2.2.2 MAC: Target Channel Type |2.2.3 MAC: RLC Mode |2.2.4 RLC: Data/Control |2.2.5 RLC: PDU Type |2.2.6 RLC: Acknowledgement Super Field |2.2.6.1 RLC: SUFI Type |2.2.6.2 RLC: Last Sequence Number |2.2.7 RLC: Padding |2.2.7.1 RLC: Padding | | | DCCH on DCH |Logical Channel 4 |DCCH (Dedicated Control Channel) |Acknowledge Mode |Control PDU |STATUS |Acknowledgement |2 |'000000000000000000000000000000000'B |'000000000000000000000000000000000'B |'000000000000000000000000000000000'B |'0000000000000000000000000'B | | | | | | | | | | | | | | 23 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. MAC-PDU, UE/LogCH Identification • Example: MAC-PDU (Transport Block) | |01-----|--01---|**b16*** |----0010 | |1------|**b12*** |-----1-|------01 |0001010|-------1 |1111111|-------0 |**B10*** |***B4*** 2 FP: Transport Block | 2.1 MAC: Target Channel Type Field | 2.2 MAC: UE-ID Type | 2.3 MAC: UE-ID | 2.4 MAC: C/T Field | 2.5 MAC: RLC Mode | 2.6 RLC: Data/Control | 2.7 RLC: Sequence Number | 2.8 RLC: Polling Bit | 2.9 RLC: Header extension type | 2.10 RLC: Length Indicator | 2.11 RLC: Extension Bit | 2.12 RLC: Length Indicator | 2.13 RLC: Extension Bit | 2.14 RLC: Last Data Segment | 2.15 RLC: Padding DCCH on FACH |DTCH/DCCH (Dedicated Traffic/Cont... |C-RNTI (Cell Radio Network Tempor... |0 |Logical Channel 3 |Acknowledge Mode |Acknowledged mode data PDU |1 |Request a status report |Octet contains LI and E bit |10 |The next field is LI and E bit |Rest is padding |The next field is data |94 02 08 00 18 00 11 88 10 00 |00 00 00 00 | | | | | | | | | | | | | | | | 24 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. MAC-PDU, UE/LogCH Identification The two examples show a trace made on Iub interface. They contain MAC PDU on non-high speed channels. The first example shows a transport block on DCH. There is no UE-ID because a DCH is already identifying a UE uniquely. Also there is no TCTF, because on a DCH there can be either DCCH or DTCH but not mixed. The second example shows a transport block on FACH. The TCTF indicates that DCCH is transported, thus a UE-ID is required to assign the dedicated data to a UE. In this case the c-rnti is used. 25 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2. Medium Access Control MAC 2.3. RACH Access Control 26 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.3. RACH Access Control – Basic Procedure 1(3) Uu Iub UE MAC START M= 1 Wait 10 ms R=random (0≤R<1) IF (R ≤ P) TRUE FALSE 1st Preamble Cycle PHY P = Persistence Value (SIB 7) M = Preamble Cycle Counter (UE counter) Node B PHY RNC MAC [PHY] Acess.Request PHY:PRACH PHY:PRACH AccessPreamble AccessPreamble Case: No acquisition indication 1) maximum no. of preambles 2) maximum power on PRACH ... [PHY] NoAck.Indication PHY:PRACH AccessPreamble 27 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.3. RACH Access Control – Basic Procedure 2(3) Uu Iub UE MAC Wait 10 ms M:=M+1 Wait 10 ms R=random (0≤R<1) IF (R ≤ P) TRUE FALSE 2nd Preamble Cycle PHY PHY Node B RNC MAC [PHY] Acess.Request PHY:PRACH PHY:PRACH PHY:AICH AccessPreamble AccessPreamble AI = -1 Case: Negative acquisition indication [PHY] NAck.Indication 28 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.3. RACH Access Control – Basic Procedure 3(3) Uu Iub UE MAC PHY PHY Node B NBO1min = minimum value for backoff timer 1 (SIB) NBO1max = maximum value for backoff timer 1 (SIB) RNC MAC Wait 10 ms NBO1=random {0 ≤ NBO1min ≤ NBO1 ≤ NBO1max} Wait TBO1 (= NBO1 x 10 ms) M:=M+1 Wait 10 ms R=random (0≤R<1) IF (R ≤ P) TRUE FALSE 3rd Preamble Cycle [PHY] Acess.Request [PHY] [PHY] 29 PHY:PRACH PHY:AICH PHY:PRACH AccessPreamble AI = +1 RACH Data CONFIDENTIAL - DRAFT Case: Positive acquisition indication Ack.Indication Data.Request RACH-FP RACH DATA Alexander Seifarth June 1, 2005 2.3. RACH Access Control – Basic Procedure The MAC layer is in control of the PRACH preamble cycles. This means the MAC layer has to trigger PRACH preamble cycles and to handle negative outcomes of this procedure. Whenever a data transmission on RACH shall be done the MAC layer will first of all generate a random number R and compare it against a so called persistence value P. The persistence value P is coming from system information SIB 7, a block generated by the Node B itself. If the number R is bigger than P (R>P) then the MAC layer will wait 10 ms and generate a new random number. If R is less or equal to P then the physical layer can start a random number. By decreasing P the Node B can reduce the number of UE that will simultaneously access the RACH. When a preamble cycle ends without an indication from the Node B, then the MAC layer will wait another 10 ms and restart the preamble cycle (of course with random number and persistence check first) again. When a preamble cycle ends with a negative indication from the Node B, then again the MAC layer has to wait 10 ms. But afterwards the backoff 1 timer (T_BO1) is started with a time N_BO1 x 10 ms. N_BO1 is a random number that lies within the range N_BO1min and N_BO1max. These limits are BCCH parameters. When T_BO1 has its time out, then another preamble cycle including persistence check is done. Both negative cases (no indication, negative indication) will be aborted when the maximum number of preambles (BCCH parameter) is exceeded. In case the preamble cycle is positive, then the RACH data will be transmitted. 30 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3. Radio Link Control (RLC) Protocol 31 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3. Radio Link Control (RLC) Protocol 3.1. RLC Modes of Operation 32 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.1. RLC Modes of Operation RLC Modes RLC Modes Transparent Mode Transparent Mode TM TM • no sequence number check • no acknowledgements • no retransmission • segmentation/reassembly may be used or not used • no RLC overhead Unacknowledged Mode Unacknowledged Mode UM UM • sequence number check • no acknowledgements • no retransmission • segmentation/reassembly is done in RLC • sequence number and length indicators included in RLC frame Acknowledged Mode Acknowledged Mode AM AM • sequence number check • acknowledgements • retransmission • segmentation/reassembly is done in RLC • sequence number and length indicators included in RLC frame + RLC control messages required MAC Header MAC Header RLC Seq. No. Length Indicators MAC Header RLC Seq. No. Length Indicators cipher unit cipher unit RLC SDU (Data) cipher unit RLC SDU (Data) RLC SDU (Data or Ctrl) 33 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.1. RLC Modes of Operation The RLC protocol is used to enhance the reliability of a single radio bearer. Thus there is one instance of RLC protocol per radio bearer available. Each RLC instance can be set in one of three modes independent of each other: • Transparent Mode (TM): In transparent mode there is no additional reliability provided by the RLC protocol instance. Only segmentation and reassembly functions might be used. There is no RLC overhead included in this mode. Ciphering is done over the whole RLC SDU. • Unacknowledged Mode (UM): In unacknowledged mode there is at least a sequence number check provided by RLC. This is used to ensure correct reassembly. Thus there are sequence numbers and length indicators for reassembly control n the RLC frame. Ciphering is done over the whole RLC PDU except the sequence number. • Acknowledged Mode (AM): In acknowledged mode the RLC protocol instance provides acknowledgements and retransmission functionality. The RLC PDU contains now sequence number, length indicators for reassembly control and RLC status messages for retransmission control. Ciphering is done over the whole RLC PDU except the sequence number. Which mode is used is configured by the RNC during radio bearer setup procedure. Thus the UE is told via RRC signalling which RLC mode to use on a radio bearer. It is possible to combine TM and UM on the same radio bearer. This can be done by assigning uplink and downlink different modes. It is not possible to combine AM with another mode, because for acknowledgements always uplink and downlink direction must be used simultaneously in AM. 34 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.1. RLC Modes of Operation LogCH Type BCCH PCCH CCCH-UL CCCH-DL DCCH DTCH CTCH TM TM TM TM TM UM UM UM UM AM AM RLC Modes 35 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3. Radio Link Control (RLC) Protocol 3.2. Segmentation/Reassembly Function 36 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.2. Segmentation/Reassembly Function Layer 3 (RRC, applic.) Layer 3 (RRC, applic.) RLC SDU #0 RLC SDU #1 RLC RLC RLC header #0.0 RLC header #0.1 #1.0 RLC header #1.1 padding MAC MAC RLC PDU #0 RLC PDU #1 RLC PDU #2 Transport Block Set MAC header RLC header RLC header RLC header #0.0 #0.1 #1.1 #1.0 padding PHY PHY MAC header MAC header 37 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.2. Segmentation/Reassembly Function Next to the enhanced reliability functions provided by RLC there is another task done by this protocol – segmentation and reassembly. The RLC protocol instances have to segment higher layer data so that a transport block of an appropriate size corresponding to the available transport formats can be formatted. The RLC protocol can perform segmentation together with concatenation (several RLC SDU or segments of an RLC SDU in one RLC PDU) and padding. The RLC protocol has been designed for maximum resource efficiency. In unacknowledged and acknowledged mode the RLC protocol includes length indicators in its PDU to indicate the end of an higher layer frame (RLC SDU). Sometimes the length indicators can also carry special control meaning. In transparent mode such length indicators are not used. Rather the RLC protocol reassembles everything that comes in the same transport blocks. This might not be exactly the inverse of the segmentation process in transparent mode. Therefore segmentation and reassembly is usually switched off when transparent mode is used. The higher layers have then to send frame of correct size to match the transport block sizes. 38 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3. Radio Link Control (RLC) Protocol 3.3. RLC Transparent Mode Procedures 39 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.3. RLC Transparent Mode Procedures UE RNC RLC TMD PDU RLC SDU segments RLC TMD PDU RLC SDU segments . . . IF all segments of a SDU received reassembly RLC TMD PDU RLC SDU segments RLC TMD PDU RLC SDU segments IF all segments of a SDU received reassembly . . . 40 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.3. RLC Transparent Mode Procedures | |00-----| |**b166** | | | | | 2 FP: Transport Block |2.1 MAC: Target Channel Type Field |2.2 MAC: RLC Mode |2.3 RLC: Whole Data | | | | | |CCCH (Common Control Channel) |Transparent Mode |'001000010000011101000000001000011'B |'010000000100110001000000001000000'B |'111110100110110000000000000000000'B |'000000000000000000000000000000000'B |'000000000000000000000000000000000'B |'0'B | | | | | | | | | RLC Transparent Mode DATA segmented SDU data 41 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.3. RLC Transparent Mode Procedures In transparent mode there is only the data transfer procedure defined. It is implemented via the TMD PDU (Transparent Mode Data). The TMD PDU contains nothing else data from higher layers, no RLC control information is to be found. 42 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3. Radio Link Control (RLC) Protocol 3.4. Unacknowledged Mode Procedures 43 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.4. Unacknowledged Mode Procedures UE RNC RLC UMD PDU Sequence No. = 2, Length Indicators, RLC SDU segments RLC UMD PDU Sequence No. = 8, Length Indicators, RLC SDU segments . . . IF all segments of a SDU received reassembly RLC UMD PDU Sequence No. = 43, Length Indicators, RLC SDU segments RLC UMD PDU Sequence No. = 47, Length Indicators, RLC SDU segments IF all segments of a SDU received reassembly . . . 44 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.4. Unacknowledged Mode Procedures | |01000000 | |0101010|-------1 |1111100|-------0 |**B18*** | |01000000 | |0101011|-------0 |**B19*** | |01000000 | |0101100|-------0 |**B19*** | |01000000 | |0101101|-------0 |**B19*** 2 FP: Transport Block |2.1 MAC: Target Channel Type Field |2.2 MAC: RLC Mode |2.3 RLC: Sequence Number |2.4 RLC: Extension Bit |2.5 RLC: Length Indicator |2.6 RLC: Extension Bit |2.7 RLC: First Data Segment 3 FP: Transport Block |3.1 MAC: Target Channel Type Field |3.2 MAC: RLC Mode |3.3 RLC: Sequence Number |3.4 RLC: Extension Bit |3.5 RLC: Data Segment 2 FP: Transport Block |2.1 MAC: Target Channel Type Field |2.2 MAC: RLC Mode |2.3 RLC: Sequence Number |2.4 RLC: Extension Bit |2.5 RLC: Data Segment 3 FP: Transport Block |3.1 MAC: Target Channel Type Field |3.2 MAC: RLC Mode |3.3 RLC: Sequence Number |3.4 RLC: Extension Bit |3.5 RLC: Data Segment |CCCH (Common Control Channel) |Unacknowledge Mode |42 |The next field is LI and E bit |Start with new SDU |The next field is data |30 f7 36 c0 00 04 24 c4 02 00 18... |CCCH (Common Control Channel) |Unacknowledge Mode |43 |The next field is data |49 d3 e2 84 f8 ea 30 00 14 61 67... |CCCH (Common Control Channel) |Unacknowledge Mode |44 |The next field is data |92 13 e5 a9 40 00 52 8a 13 a7 cd... |CCCH (Common Control Channel) |Unacknowledge Mode |45 |The next field is data |d3 e8 84 fa 6a 90 00 15 08 00 06... | | | | | | | | | | | | | | | | | | | | | | | | | | 45 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.4. Unacknowledged Mode Procedures | |01000000 | |0101110|-------0 |**B19*** | |01000000 | |0101111|-------1 |0001110|-------1 |1111111|-------0 |**B14*** |***B3*** 2 FP: Transport Block |2.1 MAC: Target Channel Type Field |2.2 MAC: RLC Mode |2.3 RLC: Sequence Number |2.4 RLC: Extension Bit |2.5 RLC: Data Segment 3 FP: Transport Block |3.1 MAC: Target Channel Type Field |3.2 MAC: RLC Mode |3.3 RLC: Sequence Number |3.4 RLC: Extension Bit |3.5 RLC: Length Indicator |3.6 RLC: Extension Bit |3.7 RLC: Length Indicator |3.8 RLC: Extension Bit |3.9 RLC: Last Data Segment |3.10 RLC: Padding |CCCH (Common Control Channel) |Unacknowledge Mode |46 |The next field is data |04 80 11 dc 32 00 01 04 13 f7 eb... |CCCH (Common Control Channel) |Unacknowledge Mode |47 |The next field is LI and E bit |14 |The next field is LI and E bit |Rest is padding |The next field is data |ba dd fc 80 64 53 ca 08 00 40 8c... |00 00 00 | | | | | | | | | | | | | | | | | 46 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.4. Unacknowledged Mode Procedures • UMD PDU (7-bit Length Indicators) Sequence Number LI0 E E • UMD PDU (15-bit Length Indicators) Sequence Number LI0 (high part) LI0 (low part) E=0 E ... E LIN-1 ... LIN-1 (high part) LIN-1 E=0 segmented RLC SDU segmented RLC SDU padding padding 47 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.4. Unacknowledged Mode Procedures In unacknowledged mode there is also only one frame defined, the UMD PDU (Unacknowledged Mode Data PDU). It is used to carry RLC SDU or segments of RLC SDU between UE and RNC. To enable faithful segmentation and reassembly, length indicators are used to point to the end of the last segment of a RLC SDU. This means a length indicator is to be found whenever a UMD PDU contains the last (or the only one) segment of a RLC SDU. In some situations special length indicators will be included that have control meaning (e.g. reset of reassembly etc.). Length indicators can be either 7 bit long or 15 bit long. It depends on the largest UMD PDU (transport block size – MAC header size) in the associated transport channel. If the maximum UMD PDU size is less or equal 125 bytes, then 7 bit length indicators shall be used, otherwise 15 bit length indicators have to be included in the UMD PDU. For detection of lost RLC PDU there is a 7 bit long sequence number included in every UMD PDU. If an UMD PDU is lost, then all RLC SDU with segments in this UMD PDU are discarded by the receiver. 48 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3. Radio Link Control (RLC) Protocol 3.5. Acknowledged Mode Procedures 49 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.5. Acknowledged Mode Procedures UE Reset RNC RLC RESET PDU Reset Sequence Number, Hyper Frame Number uplink (HFNI) RLC RESET ACK PDU Reset Sequence Number, Hyper Frame Number downlink (HFNI) RLC RESET PDU Reset Sequence Number, Hyper Frame Number downlink (HFNI) RLC RESET ACK PDU Reset Sequence Number, Hyper Frame Number uplink (HFNI) 50 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.5. Acknowledged Mode Procedures UE Data Transfer with Solitary STATUS PDU RNC RLC AMD PDU Sequence No. = 12, Poll Bit P, Length Indicators, RLC SDU segments RLC AMD PDU Sequence No. = 18, Poll Bit P, Length Indicators, RLC SDU segments . . . RLC STATUS PDU Acknowledgement super fields (SUFI): ACK, BITMAP, LIST, RLIST RLC AMD PDU Sequence No. = 12, Poll Bit P, Length Indicators, RLC SDU segments RLC AMD PDU Sequence No. = 18, Poll Bit P, Length Indicators, RLC SDU segments . . . RLC STATUS PDU Acknowledgement super fields (SUFI): ACK, BITMAP, LIST, RLIST 51 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.5. Acknowledged Mode Procedures UE Data Transfer with Piggybacked STATUS PDU RNC RLC AMD PDU Sequence No. = 12, Poll Bit P, Length Indicators, RLC SDU segments RLC AMD PDU Sequence No. = 18, Poll Bit P, Length Indicators, RLC SDU segments . . . RLC AMD PDU Sequence No. = 34, Poll Bit P, Length Indicators, RLC SDU Segments, Piggybacked STATUS PDU = {Acknowledgement super fields (SUFI): ACK, BITMAP, LIST, RLIST} RLC AMD PDU Sequence No. = 12, Poll Bit P, Length Indicators, RLC SDU segments RLC AMD PDU Sequence No. = 28, Poll Bit P, Length Indicators, RLC SDU segments . . . RLC AMD PDU Sequence No. = 39, Poll Bit P, Length Indicators, RLC SDU Segments, Piggybacked STATUS PDU = {Acknowledgement super fields (SUFI): ACK, BITMAP, LIST, RLIST} 52 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.5. Acknowledged Mode Procedures UE Move Receiving Window Procedure RNC RLC STATUS PDU Move Receiving Window (MRW) super field: SN1,...SNK RLC STATUS PDU Move Receiving Window Ack (MRWACK) super field RLC STATUS PDU Move Receiving Window (MRW) super field: SN1,...SNK RLC STATUS PDU Move Receiving Window Ack (MRWACK) super field 53 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.5. Acknowledged Mode Procedures UE Windowsize Configuration RNC RLC STATUS PDU Window (WINDOW) super field: window size RLC STATUS PDU Window (WINDOW) super field: window size 54 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.5. Acknowledged Mode Procedures In acknowledged mode there some more procedures defined. In detail we have • Reset: The Reset procedure is used to recover after errors in acknowledged mode. A new HFNI (Hyper Frame Number Indicator) for ciphering can be allocated at Reset procedure. The RESET PDU and RESET ACK PDU are defined for this procedure. • Data Transfer with solitary STATUS PDU: For data transfer the AMD (Acknowledged Mode Data) PDU is defined. It carries a 12 bit long sequence number. A single AMD or a series of AMD PDU can be acknowledged by a stand-alone acknowledgement in form of a STATUS PDU. • Data Transfer with piggybacked STATUS PDU: Very often AMD PDU are exchanged in both directions. In this case it is possible to include STATUS PDU in AMD PDU for acknowledgements. This simply is more efficient with respect to bandwidth usage. • Move Receiving Window: In some situations an AMD PDU is transmitted and retransmitted correctly. This situation can be determined by thresholds (maximum number of retransmissions) or timers (maximum time for data transmission). Either an error is the result or both sides agree to skip the problematic AMD PDU. For skipping (discarding) the Move Receiving Window procedure is used. In a STATUS PDU the command to move the receiving window with the sequence numbers of the AMD PDU to be discarded are indicated. An acknowledgement completes the procedure. • Window Size: The RLC protocol uses acknowledgements that acknowledges several AMD PDU with one message. The maximum number of AMD PDU that can be sent without acknowledgement is indicated in the window size procedure. A STATUS PDU contains a window size field in which the limit is indicated. 55 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.5. Acknowledged Mode Procedures | |0010---| | |----1--|**b12*** |-1-----|--01---|***b7*** |---1---|***b7*** |---0---|**b72*** |**b40*** | |0010---| | |----0--|-----000 | |0010---|**b12*** | |**b124** | | | 56 June 1, 2005 2.2 FP: Transport Block |2.2.1 MAC: C/T Field |2.2.2 MAC: Target Channel Type |2.2.3 MAC: RLC Mode |2.2.4 RLC: Data/Control |2.2.5 RLC: Sequence Number |2.2.6 RLC: Polling Bit |2.2.7 RLC: Header extension type |2.2.8 RLC: Length Indicator |2.2.9 RLC: Extension Bit |2.2.10 RLC: Length Indicator |2.2.11 RLC: Extension Bit |2.2.12 RLC: Last Data Segment |2.2.13 RLC: Padding |Logical Channel 3 |DCCH (Dedicated Control Channel) |Acknowledge Mode |Acknowledged mode data PDU |2 |Request a status report |Octet contains LI and E bit |9 |The next field is LI and E bit |Rest is padding |The next field is data |df d9 4c ed 0d 21 31 f1 10 |00 00 00 00 00 | | | | | | | | | | | | | | | | | | | | | | | | | | | | 2.2 FP: Transport Block |2.2.1 MAC: C/T Field |Logical Channel 3 |2.2.2 MAC: Target Channel Type |DCCH (Dedicated Control Channel) |2.2.3 MAC: RLC Mode |Acknowledge Mode |2.2.4 RLC: Data/Control |Control PDU |2.2.5 RLC: PDU Type |STATUS |2.2.6 RLC: Acknowledgement Super Field |2.2.6.1 RLC: SUFI Type |Acknowledgement |2.2.6.2 RLC: Last Sequence Number |3 |2.2.7 RLC: Padding |2.2.7.1 RLC: Padding |'000000000000000000000000000000000'B | |'000000000000000000000000000000000'B | |'000000000000000000000000000000000'B | |'0000000000000000000000000'B CONFIDENTIAL - DRAFT Alexander Seifarth 3.5. Acknowledged Mode Procedures • AMD PDU (7-bit Length Indicators) D/C (1) • AMD PDU (15-bit Length Indicators) D/C (1) Sequence Number (high part) Sequence Number (high part) Seq.Number (low part) P HE E Seq.Number (low part) P HE LI0 ... E=0 LI0 (high part) LI0 (low part) E LIN-1 ... LIN-1 (high part) LIN-1 E=0 segmented RLC SDU segmented RLC SDU Padding| piggybacked STATUS PDU padding 57 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.5. Acknowledged Mode Procedures • RESET/RESET ACK PDU D/C (0) PDU TYPE 001/010 • STATUS PDU D/C (0) PDU TYPE 000 RSN reserved SUFI #1 HFNI HFNI HFNI padding SUFI #1 ... SUFI #N padding padding Note: In case of a piggybacked STATUS PDU the D/C bit is reserved. 58 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.5. Acknowledged Mode Procedures Super Fields (SUFI) NO_MORE 0 0 0 0 WINDOW LIST MRW 0 0 1 1 LENGTH SN1 high SN1 low L1 0 1 1 0 LENGTH SN1 SN1 low high 0 0 0 1 WSN high WSN low ACK ... SN2 high SNLENGTH high SN2 high ... 0 0 1 0 LSN SNLENGTH high low LLENGTH SNLENGTH SNLENGTH low high LSN low RLIST BITMAP NLENGTH 0 1 0 0 LENGTH FSN high FSN low BITMAP BITMAP MRW_ACK 0 1 0 1 LENGTH FSN high FSN low CW1 0 1 1 1 SNACK low NLENGTH Padding ... SNACK high Padding ... CWLENGTH padding 59 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.5. Acknowledged Mode Procedures AMD PDU have a similar format like UMD PDU. The sequence of length indicators is used to control reassembly. Each length indicator points to the end of the last segment of a RLC SDU. Furthermore some special length indicator values are reserved (e.g. whether a STATUS PDU is carried within the AMD PDU or not, etc.). Again there are 7 bit long length indicators and 15 bit long length indicators. If the maximum AMD PDU size is less or equal to 126 octets then 7 bit long length indicators shall be used, otherwise 15 bit length indicators are chosen. The sequence number of AMD PDU is 12 bit long to enable bigger window size for acknowledgements. The poll bit P is used to request immediate acknowledgement for a AMD PDU. STATUS PDU contain one or more so called super fields SUFI. Each SUFI carries special acknowledged mode control meaning for acknowledgements, window size negotiation, moving receiving window. The following SUFI types are known: • No More: Indicates end of the STATUS PDU. • ACK: A simple acknowledgement. Indicates the next expected AMD PDU sequence number (LSN: last sequence number). • LIST: Indicates gaps of the reception of AMD PDU. Each gap is indicated by its start sequence number (SN: start number) and its length (L:length). Up to 15 gaps can be indicated in a single LIST super field. • BITMAP: Indicates positive or negative acknowledgement for a series of consecutive AMD PDU with a bitmap. The first bit of the bitmap stands for AMD PDU with sequence number FSN (FSN: first sequence number). The second bit of the bitmap is for FSN+1, and so on. When the bit is ‘0’ the associated AMD PDU is negatively acknowledged. • MRW/MRW_ACK: Used to move the receiving window. Inside the MRW field each AMD PDU to be discarded is indicated by its sequence number SN. • RLIST: A relative list used to indicate gaps in the reception. The method to specify the gap is different to LIST super field. In a RLIST special code words CW are used to calculate gap start and length. 60 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth Module 03 Radio Resource Control Signalling (RRC) Version 0.0.1 (21/03/2005) Author: Alexander Seifarth ([email protected]) 1 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1. System Information 2 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1. System Information 1.1. System Information Blocks and Segmentation 3 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.1. System Information Blocks and Segments UE RNC [BCH:BCCH] RRC SystemInformation (SI) SFNPrime (INTEGER 0…4094 step 2), Segment Combination = CHOICE { Combination 1: no data | Combination 2: first segment | Combination 3: subsequence segment | Combination 4: last segment | Combination 5: last segment, first segment | Combination 6: last segment, complete list = {complete block#0, …, complete block#N} | Combination 7: last segment, complete list = {complete block#0, …, complete block#N}, first segment | Combination 8: complete list = {complete block#0, …, complete block#N} | Combination 9: complete list = {complete block#0, …, complete block#N}, first segment | Combination10: complete SIB of size 215…226 | Combination11: last segment of size 215…226 } System Information Block (SIB): first subsequent segment segment ... subsequent last segment segment 4 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.1. System Information Blocks and Segments Signalling on the BCCH is done by means of the RRC System Information. On the BCH that carries the BCCH there is only RLC transparent mode used. Thus the RRC protocol must provide its own sequence numbering and segmentation functionality. For segmentation of System Information Blocks (SIB) the RRC protocol defines the System Information (SI) message. In each SI message one or more segments of a SIB or several SIB can be contained. Several combinations allow to indicate first, last and subsequent segments, or to bundle several complete blocks in one SI message. Additionally to the SIB segments the SI message also indicates the cell time via the System Frame Number (0..4095). The SFN is translated into the SFN prime via th following rule. In each frame with even SFN (SFN mod 2 = 0) it holds SFN prime = SFN. In radio frames with odd SFN (SFN mod 2 = 1) we have SFN prime = SFN-1. In other words the SFN prime is increased with every second radio frame by 2. 5 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1. System Information 1.2. Master and Scheduling Information Blocks 6 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.1. Master and Scheduling Information Blocks UE Master Information Block (MIB) RNC [BCH:BCCH] RRC MasterInformationBlock (MIB) MIB value tag, supported PLMN types = GSM-MAP|ANSI-41|GSM-MAP+ANSI-41, PLMN identity = MCC + MNC, ANSI-41-CN information, references to other system information blocks = { SIB Type, value tag, scheduling } 80 ms [BCH:BCCH] RRC MasterInformationBlock (MIB) MIB value tag, supported PLMN types = GSM-MAP|ANSI-41|GSM-MAP+ANSI-41, PLMN identity = MCC + MNC, ANSI-41-CN information, references to other system information blocks = { SIB Type, value tag, scheduling } 80 ms [BCH:BCCH] RRC MasterInformationBlock (MIB) MIB value tag, supported PLMN types = GSM-MAP|ANSI-41|GSM-MAP+ANSI-41, PLMN identity = MCC + MNC, ANSI-41-CN information, references to other system information blocks = { SIB Type, value tag, scheduling } 7 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.1. Master and Scheduling Information Blocks UE Scheduling Information Block (SchIB1/2) RNC [BCH:BCCH] RRC SchedulingInformationBlock1/2 references to other system information blocks = { SIB Type, value tag, scheduling } repetition rate given in MIB [BCH:BCCH] RRC SchedulingInformationBlock1/2 references to other system information blocks = { SIB Type, value tag, scheduling } repetition rate given in MIB [BCH:BCCH] RRC SchedulingInformationBlock1/2 references to other system information blocks = { SIB Type, value tag, scheduling } 8 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.1. Master and Scheduling Information Blocks Master Information Block MIB | | | | |-001---| | | | |***b4*** |--0110-|***b4*** | |---0000|***b4*** | | | |***b8*** | | | | |***b6*** | | |------01 ... 9 June 1, 2005 |masterInfoBlock (= masterInfoBlock) |sib_description |1 sib_choice |1.1 masterInfoBlock |1.1.1 mib-ValueTag |1.1.2 plmn-Type |1.1.2.1 gsm-MAP |1.1.2.1.1 plmn-Identity |1.1.2.1.1.1 mcc |1.1.2.1.1.1.1 digit |1.1.2.1.1.1.2 digit |1.1.2.1.1.1.3 digit |1.1.2.1.1.2 mnc |1.1.2.1.1.2.1 digit |1.1.2.1.1.2.2 digit |1.1.3 sibSb-ReferenceList |1.1.3.1 schedulingInformationSIBSb |1.1.3.1.1 sibSb-Type |1.1.3.1.1.1 sysInfoType1 |1.1.3.1.2 scheduling |1.1.3.1.2.1 scheduling |1.1.3.1.2.1.1 segCount |1.1.3.1.2.1.2 sib-Pos |1.1.3.1.2.1.2.1 rep128 |1.1.3.2 schedulingInformationSIBSb |1.1.3.2.1 sibSb-Type |1.1.3.2.1.1 sysInfoType2 CONFIDENTIAL - DRAFT |2 |2 |6 |2 |0 |9 |44 |1 |6 |2 | | | | | | | | | | | | | | | | | | | | | | | | | | | Alexander Seifarth 1.1. Master and Scheduling Information Blocks The individual system information blocks in the RRC protocol divide the information into groups. Two blocks have special meaning: the master information block and the scheduling information blocks. In the master information block MIB the PLMN type (GSM-MAP or ANSI-41) is indicated. For GSM-MAP the PLMN identity (MCC + MNC) is broadcasted also in the MIB. Then for every further system information block the MIB indicates scheduling information and a value tag (except SIB 7). The value tag indicates changes of the associated SIB by incremented value. The master information block always starts at radio frames with SFN mod 8 = 0. 10 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1. System Information 1.3. System Information Blocks (SIB) 11 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.3. System Information Blocks (SIB) UE General System Information Transmission RNC [BCH:BCCH] RRC SIBx SIBx data repetition rate given in MIB [BCH:BCCH] RRC SIBx SIBx data repetition rate given in MIB [BCH:BCCH] RRC SIBx SIBx data 12 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.3. System Information Blocks (SIB) UE RNC [BCH:BCCH] RRC SIB1 CN common GSM-MAP NAS info = LAC, CS domain system info = {periodic LAU timer T3212, ATT flag}, PS domain system info = {RAC, Network Mode of Operation NMO}, UE timers and constants in idle mode, UE timers and constants in connected mode [BCH:BCCH] RRC SIB2 URA-ID list = URA#1,.., URA#<maxURA> [BCH:BCCH] RRC SIB3 SIB4 indicator = true|false, cell identity, cell selection and re-selection info, cell access restriction [BCH:BCCH] RRC SIB4 cell identity, cell selection and re-selection info, cell access restriction 13 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.3. System Information Blocks (SIB) UE RNC [BCH:BCCH] RRC SIB5 SIB6 indicator = true|false, PICH power offset, AICH power offset, secondary CCPCH system info, primary CCPCH info = Tx diversity indicator, PRACH system information list, CBS DRX level 1 information [BCH:BCCH] RRC SIB6 PICH power offset, AICH power offset, secondary CCPCH system info, CBS DRX level 1 information, primary CCPCH info = Tx diversity indicator, PRACH system information list [BCH:BCCH] RRC SIB7 UL interference, dynamic persistence level for PRACH in SIB5/6, expiration time factor [BCH:BCCH] RRC SIB8 CPCH parameters (UE access parameters), CSICH power offset, CPCH set info (code and resource info) [BCH:BCCH] RRC SIB9 CPCH persistence levels 14 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.3. System Information Blocks (SIB) UE RNC [BCH:BCCH] RRC SIB10 DRAC (dynamic resource allocation) system information [BCH:BCCH] RRC SIB11 SIB12 indicator = true|false, FACH measurement occasion info = {measurement cycle length info, IF/IRAT measurement indicators} measurement control system information = {HCS indicator, cell selection/re-selection quantity, neighbour cell list SF/IF/IRAT, traffic volume measurements} [BCH:BCCH] RRC SIB12 FACH measurement occasion info = {measurement cycle length info, IF/IRAT measurement indicators} measurement control system information = {HCS indicator, cell selection/re-selection quantity, neighbour cell list SF/IF/IRAT, traffic volume measurements} [BCH:BCCH] RRC SIB13|SIB13.1|SIB13.2|SIB13.3|SIB13.4 ANSI-41 CN information 15 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.3. System Information Blocks (SIB) UE RNC [BCH:BCCH] RRC SIB14 3.84 Mcps TDD mode system information [BCH:BCCH] RRC SIB15|SIB15.1|SIB15.2|SIB15.3|SIB15.4|SIB15.5 system information for UE positioning [BCH:BCCH] RRC SIB16 pre-defined RB/TrCH/PhCH configuration for inter-system handover to UTRAN [BCH:BCCH] RRC SIB17 3.84 Mcps TDD|1.28 Mcps TDD mode system information [BCH:BCCH] RRC SIB18 PLMN identities for neighbour cells for idle|connected mode UE 16 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.3. System Information Blocks (SIB) System Information Block SIB1 | | | | |**b16*** | | |0------| |**b16*** |-----01| |-------1 | |**b16*** |----01-| |----1010 |010----|---1100... |--001--| |***b4*** |-011---|----1010 |000----17 June 1, 2005 |sibType1 (= sibType1) |sib_description |1 sib_choice |1.1 sibType1 |1.1.1 cn-CommonGSM-MAP-NAS-SysInfo |1.1.2 cn-DomainSysInfoList |1.1.2.1 cN-DomainSysInfo |1.1.2.1.1 cn-DomainIdentity |1.1.2.1.2 cn-Type |1.1.2.1.2.1 gsm-MAP |1.1.2.1.3 cn-DRX-CycleLengthCoeff |1.1.2.2 cN-DomainSysInfo |1.1.2.2.1 cn-DomainIdentity |1.1.2.2.2 cn-Type |1.1.2.2.2.1 gsm-MAP |1.1.2.2.3 cn-DRX-CycleLengthCoeff |1.1.3 ue-ConnTimersAndConstants |1.1.3.1 t-301 |1.1.3.2 n-301 |1.1.3.3 t-302 |1.1.3.22 t-317 |1.1.4 ue-IdleTimersAndConstants |1.1.4.1 t-300 |1.1.4.2 n-300 |1.1.4.3 t-312 |1.1.4.4 n-312 CONFIDENTIAL - DRAFT |00 18 |cs-domain |01 01 |7 |ps-domain |08 01 |7 |ms2000 |2 |ms4000 |s10 |ms1000 |3 |10 |s1 | | | | | | | | | | | | | | | | | | | | | | | | | | Alexander Seifarth 2. RRC Connection Handling 2.1. RRC States 18 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.1. RRC States URA_PCH URA_PCH CELL_PCH CELL_PCH CELL_DCH CELL_DCH CELL_FACH CELL_FACH UTRA IDLE UTRA IDLE 19 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.1. RRC States To manage radio resources of a UE in UMTS a state system with respect to the RRC protocol is introduced. In general a UE has two main states – UTRA Idle and UTRA Connected. The difference between idle and connected is that in connected mode there is a serving RNC for the UE, whereas in idle mode there is no serving RNC. Note that a connected mode UE can have radio resources allocated or not. In idle mode a UE cannot have radio resources. To make a more detailed specification of a connected mode UE there are four sub-states defined for connected mode: • CELL_DCH: In this state the UE uses DCH for signalling and might use additional DCH or DSCH for applications. The UE is subject to soft and hard handover procedures in this state. • CELL_FACH: In this state the UE listens to FACH for RRC signalling and uses RACH on the uplink side. Also CPCH might be in use. Mobility is handled in this state via cell reselection, handover procedures like in CELL_DCH state are not used. • CELL_PCH: Here the UE has currently no radio resources allocated. Thus the UE waits for incoming paging messages on the PCH. The UE executes cell reselection, the RNC knows the current serving cell of the UE. • URA_PCH: This state is similar to CELL_PCH, only this time the RNC knows the current URA (UTRAN Registration Area) of the UE and not the cell. In CELL_FACH, CELL_PCH and URA_PCH the UE performs automatic cell reselection. Thus the RNC has to be updated whenever the area of interest (cell for CELL_FACH and CELL_PCH, URA for URA_PCH) changes. 20 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.1. RRC States – Cell Reselection in CELL_FACH UE CELL_FACH automatic cell reselection RNC [RACH:CCCH] RLC/RRC TMD Cell Update U-RNTI, STARTCS, STARTPS, cell update cause = cell re-selection , measured results on RACH, … [FACH:CCCH] RLC/RRC UMD Cell Update Confirm U-RNTI, new U-RNTI, new C-RNTI, new DSCH-RNTI, new H-RNTI, RRC state indicator = state_X, CN info, RB to reconfigure or delete, TrCH-UL to add/reconfigure/delete, TrCH-DL to add/reconfigure/ delete, uplink/downlink physical resources State_X ... 21 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.1. RRC States – Cell Reselection in CELL_PCH UE CELL_PCH automatic cell reselection CELL_FACH RNC [RACH:CCCH] RLC/RRC TMD Cell Update U-RNTI, STARTCS, STARTPS, cell update cause = cell re-selection , measured results on RACH, … [FACH:CCCH] RLC/RRC UMD Cell Update Confirm U-RNTI, new U-RNTI, new C-RNTI, new DSCH-RNTI, new H-RNTI, RRC state indicator = state_X, CN info, RB to reconfigure or delete, TrCH-UL to add/reconfigure/delete, TrCH-DL to add/reconfigure/ delete, uplink/downlink physical resources State_X ... 22 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.1. RRC States –URA Reselection in URA_PCH UE URA_PCH automatic cell reselection (new cell is not part of old URA) false true CELL_FACH URA_PCH RNC [RACH:CCCH] RLC/RRC TMD URA Update U-RNTI, STARTCS, STARTPS, URA update cause = URA re-selection [FACH:CCCH] RLC/RRC UMD URA Update Confirm U-RNTI, new U-RNTI, new C-RNTI, new DSCH-RNTI, new H-RNTI, RRC state indicator = state_X, CN info, RB to reconfigure or delete, TrCH-UL to add/reconfigure/delete, TrCH-DL to add/reconfigure/ delete, uplink/downlink physical resources State_X ... CONFIDENTIAL - DRAFT 23 June 1, 2005 Alexander Seifarth 2.1. Mobility Handling in CELL_FACH, CELL_PCH and URA_PCH When a UE reselects a cell in CELL_FACH state, it has to perform a CELL UPDATE procedure afterwards in the new cell. The CELL UPDATE message contains the current UE identifier (U-RNTI), so that the RNC can identify the UE. The message is sent on RACH via CCCH. Thus the associated response CELL UPDATE CONFIRM is returned to the UE on the FACH, also CCCH. In this message the UE is assigned a new state or again CELL_FACH. A similar procedure is done when a UE reselects a cell in CELL_PCH state. The only difference to the update procedure in CELL_FACH is, that after the cell reselection the UE enters automatically CELL_FACH state and then sends CELL UPDATE to the RNC. With the CELL UPDATE CONFIRM the UE is sent to a new state or back to CELL_PCH. In case the UE reselects a cell in URA_PCH state then another procedure is done. First of all the UE checks whether the new cell still belongs to the old URA. If this is true no update procedure will be performed. Otherwise the UE enters CELL_FACH state and sends URA UPDATE on RACH. The response CELL UPDATE CONFIRM on the FACH contains again a new state for the UE. If this state is set to URA_PCH, then the UE goes back to URA_PCH state and enters the master URA (URA #0 in SIB2) of the new cell. 24 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2. RRC Connection Handling 2.2. RRC Connection Establishment 25 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. RRC Connection Estab. - CELL_FACH UE UTRA IDLE NAS Trigger UTRA IDLE CELL_FACH RNC [RACH:CCCH] RLC/RRC TMD RRC Connection Request pre-defined configuration status indicator = true|false, Initial UE ID, establishment cause, measured result on RACH • • • • • • orig./term. conversational call orig./term. streaming call orig./term. interactive call orig./term. background call originating subscribed traffic call emergency call • • • • • • • inter-RAT cell re-selection inter-RAT cell change order registration detach orig./term. high/low priority signalling call re-establishment terminating – cause unknown • • • • TMSI + LAI PTMSI + RAI IMSI IMEI [FACH:CCCH] RLC/RRC UMD RRC Connection Setup Initial UE ID, new U-RNTI, new C-RNTI, RRC state indicator = CELL_FACH, capability update requirement, signalling radio bearer to setup, TrCH to add/reconfigure [RACH:DCCH] RLC/RRC [RACH:DCCH] RLC/Acknowledgement CELL_FACH 26 June 1, 2005 AMD RRC Connection Setup Complete STATUS STARTCS, STARTPS, UE radio access capability, inter-RAT UE radio access capability CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. RRC Connection Est. – CELL_FACH RRC Connection Establishment CELL_FACH (short trace) +--------+--------------------+------------+------------+------------+-------------------------------------+ |No |Long Time |2. Prot |2. MSG |3. Prot |3. MSG | +--------+--------------------+------------+------------+------------+-------------------------------------+ |68 |17:25:34,045,725 |RLC/MAC |FP DATA RACH| | | |69 |17:25:34,045,725 |RLC reasm. |TM DATA RACH|RRC_CCCH_UL |rrcConnectionRequest | |70 |17:25:34,130,812 |RLC/MAC |FP DATA FACH| | | |71 |17:25:34,140,807 |RLC/MAC |FP DATA FACH| | | |72 |17:25:34,150,775 |RLC/MAC |FP DATA FACH| | | |73 |17:25:34,150,775 |RLC reasm. |UM DATA FACH|RRC_CCCH_DL |rrcConnectionSetup | |74 |17:25:34,414,754 |RLC/MAC |FP DATA RACH| | | |75 |17:25:34,513,729 |RLC/MAC |FP DATA RACH| | | |76 |17:25:34,513,729 |RLC reasm. |AM DATA RACH|RRC_DCCH_UL |rrcConnectionSetupComplete | 27 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. RRC Connection Est. – CELL_FACH RRC Connection Request |TS 25.331 CCCH-UL (2002-09) (RRC_CCCH_UL) rrcConnectionRequest (= rrcConnectionRequest) | |uL-CCCH-Message | |1 message | |1.1 rrcConnectionRequest | |1.1.1 initialUE-Identity | |1.1.1.1 tmsi-and-LAI |***B4*** |1.1.1.1.1 tmsi |'00000111010000000010000110011110'B | |1.1.1.1.2 lai | |1.1.1.1.2.1 plmn-Identity | |1.1.1.1.2.1.1 mcc |0010---|1.1.1.1.2.1.1.1 digit |2 |----0110 |1.1.1.1.2.1.1.2 digit |6 |0010---|1.1.1.1.2.1.1.3 digit |2 | |1.1.1.1.2.1.2 mnc |***b4*** |1.1.1.1.2.1.2.1 digit |0 |-0010--|1.1.1.1.2.1.2.2 digit |2 |**b16*** |1.1.1.1.2.2 lac |'0000011111010010'B |***b5*** |1.1.2 establishmentCause |registration |--0----|1.1.3 protocolErrorIndicator |noError | | | | | | | | | | | | | | | | | | | 28 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. RRC Connection Est. – CELL_FACH RRC Connection Setup 1( ) |TS 25.331 CCCH-DL (2002-09) (RRC_CCCH_DL) rrcConnectionSetup (= rrcConnectionSetup) | |dL-CCCH-Message | |1 message | |1.1 rrcConnectionSetup | |1.1.1 r3 | |1.1.1.1 rrcConnectionSetup-r3 | |1.1.1.1.1 initialUE-Identity | |1.1.1.1.1.1 tmsi-and-LAI |**b32*** |1.1.1.1.1.1.1 tmsi |'00000111010000000010000110011110'B | |1.1.1.1.1.1.2 lai | |1.1.1.1.1.1.2.1 plmn-Identity | |1.1.1.1.1.1.2.1.1 mcc |---0010|1.1.1.1.1.1.2.1.1.1 digit |2 |***b4*** |1.1.1.1.1.1.2.1.1.2 digit |6 |---0010|1.1.1.1.1.1.2.1.1.3 digit |2 | |1.1.1.1.1.1.2.1.2 mnc |0000---|1.1.1.1.1.1.2.1.2.1 digit |0 |----0010 |1.1.1.1.1.1.2.1.2.2 digit |2 |***B2*** |1.1.1.1.1.1.2.2 lac |'0000011111010010'B |00-----|1.1.1.1.2 rrc-TransactionIdentifier |0 | |1.1.1.1.3 new-U-RNTI |**b12*** |1.1.1.1.3.1 srnc-Identity |'010111110000'B |**b20*** |1.1.1.1.3.2 s-RNTI |'00001011101011110111'B |**b16*** |1.1.1.1.4 new-c-RNTI |'0000000000000000'B |--01---|1.1.1.1.5 rrc-StateIndicator |cell-FACH |----000|1.1.1.1.6 utran-DRX-CycleLengthCoeff |3 29 June 1, 2005 CONFIDENTIAL - DRAFT | | | | | | | | | | | | | | | | | | | | | | | | | | Alexander Seifarth 2.2. RRC Connection Est. – CELL_FACH RRC Connection Setup 2( ) | |1------|-0-----| | | | |00000--... | ... | | |***b4*** ... | | |***b4*** |1.1.1.1.7 capabilityUpdateRequirement |1.1.1.1.7.1 ue-RadioCapabilityFDDUpdateRequ.. |1.1.1.1.7.2 ue-RadioCapabilityTDDUpdateRequ.. |1.1.1.1.7.3 systemSpecificCapUpdateReqList |1.1.1.1.7.3.1 systemSpecificCapUpdateReq |1.1.1.1.8 srb-InformationSetupList |1.1.1.1.8.1 sRB-InformationSetup |1.1.1.1.8.1.1 rb-Identity |1.1.1.1.8.1.3.2 rB-MappingOption |1.1.1.1.8.1.3.2.1.1.1 ul-TransportChannelType |1.1.1.1.8.1.3.2.1.1.1.1 rach |1.1.1.1.8.1.3.2.1.1.2 logicalChannelIdentity |1.1.1.1.8.1.3.2.2.1.1 dl-TransportChannelType |1.1.1.1.8.1.3.2.2.1.1.1 fach |1.1.1.1.8.1.3.2.2.1.2 logicalChannelIdentity |1 |0 |gsm | | | | | | | | | | | | | | | |1 |0 |2 |0 |2 30 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. RRC Connection Est. – CELL_FACH RRC Connection Setup 3( ) ... | | | |***b4*** ... | | |----0010 | |-00010-| |***b5*** ... | |--00011| |00001--... |1.1.1.1.8.2.3.2 rB-MappingOption |1.1.1.1.8.2.3.2.1.1.1 ul-TransportChannelType |1.1.1.1.8.2.3.2.1.1.1.1 rach |1.1.1.1.8.2.3.2.1.1.2 logicalChannelIdentity |1.1.1.1.8.2.3.2.2.1.1 dl-TransportChannelType |1.1.1.1.8.2.3.2.2.1.1.1 fach |1.1.1.1.8.2.3.2.2.1.2 logicalChannelIdentity |1.1.1.1.8.3 sRB-InformationSetup |1.1.1.1.8.3.1 rb-Identity |1.1.1.1.8.3.2 rlc-InfoChoice |1.1.1.1.8.3.2.1 same-as-RB |1.1.1.1.8.4 sRB-InformationSetup |1.1.1.1.8.4.1 rb-Identity |1.1.1.1.8.4.2 rlc-InfoChoice |1.1.1.1.8.4.2.1 same-as-RB | | | | | | | | | | |0 |3 |0 |3 |3 |2 |4 |2 | | | | 31 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. RRC Connection Est. – CELL_FACH RRC Connection Setup Complete |TS 25.331 DCCH-UL (2002-09) (RRC_DCCH_UL) rrcConnectionSetupComplete (= rrcConnectionSetupComplete) | |uL-DCCH-Message | |1 message | |1.1 rrcConnectionSetupComplete |-00----|1.1.1 rrc-TransactionIdentifier |0 | |1.1.2 startList | |1.1.2.1 sTARTSingle |-----0-|1.1.2.1.1 cn-DomainIdentity |cs-domain |**b20*** |1.1.2.1.2 start-Value |'00000000000000000100'B | |1.1.2.2 sTARTSingle |--1----|1.1.2.2.1 cn-DomainIdentity |ps-domain |**b20*** |1.1.2.2.2 start-Value |'00000000000000001010'B | |1.1.3 ue-RadioAccessCapability | |1.1.3.1 accessStratumReleaseIndicator |r99 | |1.1.3.2 pdcp-Capability |0------|1.1.3.2.1 losslessSRNS-RelocationSupport |0 | |1.1.3.2.2 supportForRfc2507 | |1.1.3.2.2.1 notSupported |0 | |1.1.3.3 rlc-Capability |--010--|1.1.3.3.1 totalRLC-AM-BufferSize |kb50 |-----0-|1.1.3.3.2 maximumRLC-WindowSize |mws2047 |***b3*** |1.1.3.3.3 maximumAM-EntityNumber |am6 | |1.1.3.4 transportChannelCapability | |1.1.3.4.1 dl-TransChCapability |-0101--|1.1.3.4.1.1 maxNoBitsReceived |b6400 |***b4*** |1.1.3.4.1.2 maxConvCodeBitsReceived |b640 ... 32 June 1, 2005 CONFIDENTIAL - DRAFT | | | | | | | | | | | | | | | | | | | | | | | | | | Alexander Seifarth 2.2. RRC Connection Est. – CELL_FACH When a UE wants to leave idle mode and enter connected mode it has to start the RRC Connection Establishment procedure. During this procedure the UE is sent either to CELL_FACH state or CELL_DCH state. The decision which of the two states is chosen is done by the RNC. The first flow shows the transition to state CELL_FACH. The procedure is done in the following way: 1. The UE sends RRC CONNECTION REQUEST on the RACH (CCCH) to the RNC. Inside the message the UE indicates its identity in the parameter ‚Initial UE ID‘. Furthermore a cause for the request is indicated via the ‚Establishment Cause‘ information element. When the RNC has made the decision about the state (here CELL_FACH) then it sends RRC CONNECTION SETUP to the UE on FACH (CCCH). As reference to the RRC CONNECTION REQUEST the ‚Initial UE ID‘ is repeated in this message. The ‚RRC State Indicator‘ tells the UE to enter CELL_FACH state. To use DCCH/DTCH on RACH and FACH the UE needs a c-rnti, which is also indicated in this message. As sign for the connected mode the UE also gets a u-rnti. To confirm the connected mode the UE returns now RRC CONNECTION SETUP COMPLETE. This message is sent on RACH because the UE is in state CELL_FACH now. The logical channel is DCCH, thus the MAC header for the transport blocks of this message contains the c-rnti for identification of the UE. 2. 3. 33 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. RRC Connection Establishment UE UTRA IDLE NAS Trigger UTRA IDLE CELL_DCH RNC [RACH:CCCH] RLC/RRC TMD RRC Connection Request pre-defined configuration status indicator = true|false, Initial UE ID, establishment cause, measured result on RACH [FACH:CCCH] RLC/RRC UMD RRC Connection Setup Initial UE ID, new U-RNTI, RRC state indicator = CELL_DCH, capability update requirement, signalling radio bearer to setup, TrCH to add/reconfigure (signalling DCH), uplink and downlink physical resources DPCH and DPDCH/DPCCH synchronisation [DCH:DCCH] RLC/RRC [DCH:DCCH] RLC/Acknowledgement CELL_DCH AMD RRC Connection Setup Complete STATUS STARTCS, STARTPS, UE radio access capability, inter-RAT UE radio access capability 34 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. RRC Connection Establishment When the UE enters CELL_DCH instead of CELL_FACH the basic flow of messages is the same. The first difference is to be seen in the RRC CONNECTION SETUP message. The ‚RRC State Indicator‘ is now set to CELL_DCH and thus there is no c-rnti to be allocated for the UE. Rather the physical layer will identify the UE in CELL_DCH state, the MAC layer will not perform layer 2 identification. Of course the RRC CONNECTION SETUP COMPLETE message will now be sent on DCH (DCCH) instead of RACH. 35 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2. RRC Connection Handling 2.3. RRC Connection Release 36 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.3. RRC Connection Release UE CELL_DCH CELL_DCH UTRA IDLE RNC [DCH:DCCH] RLC/RRC N308, release cause UMD RRC Connection Release • • • • • • • normal event unspecified pre-emptive release congestion re-establishment reject user inactivity directed signalling connection re-establishment [DCH:DCCH] RLC/RRC N308 ... [DCH:DCCH] RLC/RRC UMD RRC Connection Release Complete UMD RRC Connection Release Complete UTRA IDLE 37 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.3. RRC Connection Release UE CELL_FACH CELL_FACH with DCCH UTRA IDLE RNC [FACH:DCCH] RLC/RRC release cause UMD RRC Connection Release AMD RRC Connection Release Complete STATUS [RACH:DCCH] RLC/RRC [FACH:DCCH] RLC/Acknowledgement UTRA IDLE UE CELL_FACH CELL_FACH without DCCH UTRA IDLE RNC [FACH:CCCH] RLC/RRC U-RNTI, release cause UTRA IDLE 38 June 1, 2005 UMD RRC Connection Release CONFIDENTIAL - DRAFT Alexander Seifarth 2.3. RRC Connection Release UE CELL_PCH or URA_PCH URA_PCH/CELL_PCH UTRA IDLE RNC [PCH:PCCH] RLC/RRC UTRA IDLE TMD Paging Type 1 U-RNTI, release indicator = release 39 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.3. RRC Connection Release To release a UE from connected mode and send it to idle the RRC Connection Release procedure is defined. Depending on the configuration of the UE the procedure has a different appearance. When the UE is in state CELL_DCH then the RNC has to send the RRC CONNECTION RELEASE procedure to the UE via the signalling DCH. Inside the message a cause value indicates the reason for the release. A counter value N308 tells the UE how often to repeat the RRC CONNECTION RELEASE COMPLETE message on the uplink DCH to confirm the procedure. After this the UE is in idle mode and the RNC can release all dedicated resources allocated to this UE. When the UE is in state CELL_FACH with allocated DCCH then the RNC also sends RRC CONNECTION RELEASE to release the UE. This time there is no counter value N308. Thus the UE sends exactly one RRC CONNECTION RELEASE COMPLETE message on RACH, then it enters idle mode. If the UE is in state CELL_FACH but has currently no DCCH (happens after paging in state CELL_PCH or URA_PCH or after cell reselection) then only the RRC CONNECTION RELEASE message is sent. No completion message follows afterwards, instead the UE enters directly idle mode (see paging procedures for more information about this). In UMTS Release 5 a new procedure is introduced. When a UE is in state CELL_PCH or URA_PCH it is possible to page it with a PAGING TYPE 1 message that contains a release indicator. If this indicator is set to release, then the UE enters directly idle mode without any further action (NOTE: There is a small inconsistency with the RRC state diagram.) 40 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3. Iu Signalling Connection Handling 41 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3. Iu Signalling Connection Handling 3.1. Iu Signalling Connections - General 42 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.1. Iu Signalling Connections - General CS ction nne g Co llin Signa Iu Iu S i MSC Server CS-MGW UE RRC Connection Serving RNC gnall ing Conn ectio n PS SGSN S-RNTI S-RNTI radio mgt. radio mgt. data data CS-Iu Sign.Connection CS-Iu Sign.Connection PS-Iu Sign.Connection PS-Iu Sign.Connection 43 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.1. Iu Signalling Connections - General CS Mobility Management States CMM_Detached CMM_Detached CMM_Idle CMM_Idle CMM_Connected CMM_Connected PS Mobility Management States PMM_Detached PMM_Detached PMM_Idle PMM_Idle PMM_Connected PMM_Connected 44 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.1. Iu Signalling Connections - General The RRC Connection provides signalling facilities between UE and RNC for radio management tasks. Of course the main reason to start signalling is to get services from the core network. In other words the UE also needs signalling transfer capabilities to and from the core network. In UMTS (like in GSM) the UE has no direct link to the CN, thus the UTRAN has to manage signalling connection towards the CN for the UE. These connections are called Iu signalling connections. They are implemented by the SCCP protocol on Iu interface. The RANAP protocol is running in Iu signalling connections. A connected mode UE can have none, one or two Iu signalling connections. At most one Iu signalling connection can be set up for a UE to the MSC server and at most one Iu signalling connection can be established to SGSN for a UE. An idle mode UE cannot have any Iu signalling connection. The reason for the last fact is that it is the serving RNC that has to manage Iu signalling connections. Within the core network entities MSC server and SGSN a mobility management state (PMM = Packet Mobility Management, CMM = Circuit Mobility Management) is maintained for each UE. PMM and CMM states are relatively equal defined. Both consist of three possible states: • P/CMM_DETACHED: A UE in state P/CMM_DETACHED is currently not registered for services in the core network entity. • P/CMM_CONNECTED: In this state the UE is registered for services in the CN entity and an Iu signalling connection for this UE exists in the moment. Thus the CN can immediately start signalling towards UE by sending a message within the appropriate Iu signalling connection. This means that CN triggered paging is not required in this state. • P/CMM_IDLE: In this state the UE is registered for services in the CN entity, but there is currently no Iu signalling connection for this UE. Thus before a signalling procedure can be started with the UE the CN must page the UE. This paging is for the UE the trigger to establish an Iu signalling connection (P/CMM_CONNECTED) state. 45 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3. Iu Signalling Connection Handling 3.2. Establishment and Signalling Transfer 46 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.2. Establishment and Signalling Transfer Iu Signalling Connection Establishment UE CELL_DCH CELL_FACH RNC SGSN MSC Server [DCCH] RLC/RRC AMD Initial Direct Transfer CN domain ID, intra domain NAS node selector, establishment cause, NAS message, START, measured results on RACH RANAP Initial UE Message CN domain ID, NAS message, LAI, RAC, … [DCCH] RLC/-acknowledgement STATUS 47 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.2. Establishment and Signalling Transfer Uplink NAS Signalling Transfer UE CELL_DCH CELL_FACH RNC SGSN MSC Server [DCCH] RLC/RRC AMD Uplink Direct Transfer CN domain ID, NAS message, measured results on RACH RANAP Direct Transfer CN domain ID, NAS message, LAI, RAC Downlink NAS Signalling Transfer UE CELL_DCH CELL_FACH RNC SGSN MSC Server [DCCH] RLC/RRC AMD Downlink Direct Transfer RANAP Direct Transfer CN domain ID, NAS message, SAPI CN domain ID, NAS message 48 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.2. Establishment and Signalling Transfer The establishment of Iu signalling connection is triggered by the UE via the INITIAL DIRECT TRANSFER message. This message indicates which core network domain the connection shall be set up to and a message for this core network is contained. On the Iu interface the serving RNC issues the RANAP message INITIAL UE MESSAGE is sent to the indicated core network domain. Once the Iu signalling connection exists, the UE and the core network can freely exchange NAS signalling with each other. The serving RNC acts as relay point for the NAS signalling messages. In case of uplink NAS signalling the UE packs the NAS message in a UPLINK DIRECT TRANSFER message, the RNC relays the message via RANAP DIRECT TRANSFER to the core network. For downlink NAS messages the CN has to encapsulate the NAS PDU in a RANAP DIRECT TRANSFER message. The RNC translates this into the DOWNLINK DIRECT TRANSFER message. The ‚SAPI‘ parameter in the DIRECT TRANSFER message gives the priority of the NAS message. 49 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3. Iu Signalling Connection Handling 3.3. Iu Signalling Connection Release 50 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.3. Iu Signalling Connection Release UE RNC SGSN MSC Server RANAP Iu Release Command release cause RANAP IF (last Iu signalling connection to be released) … Iu Release Complete RRC Connection Release Procedure ELSE IF (no radio bearer for releasing CN allocated) [DCCH] RLC/RRC CN domain ID AMD Signalling Connection Release ELSE IF (radio bearer for releasing CN allocated) [DCCH] RLC/RRC [DCCH] RLC/RRC … 51 June 1, 2005 AMD Radio Bearer Release AMD Radio Bearer Release Complete …, signalling connection release indication = CN domain ID, … CONFIDENTIAL - DRAFT Alexander Seifarth 3.3. Iu Signalling Connection Release UE RNC SGSN MSC Server [DCCH] RLC/RRC CN domain ID AMD Signalling Conn. Release Indic. RANAP Iu Release Request RANAP Iu Release Command release cause = UTRAN generated reason RANAP Handling like in normal Iu signalling connection release case Iu Release Complete 52 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.3. Iu Signalling Connection Release The release of Iu signalling connections is managed by the core network via the RANAP Iu Release procedure. The core network releases an Iu signalling connection via RANAP message IU RELEASE COMMAND. The serving RNC will respond with IU RELEASE COMPLETE. Depending on the current UE configuration there are three basic procedures possible on the radio interface: • RRC Connection Release procedure is triggered (UE is sent to IDLE state), • UE is informed about Iu signalling connection release via SIGNALLING CONNECTION RELEASE procedure, • radio bearers are released via RADIO BEARER RELEASE procedure. Of course none of these procedures is triggered when the UE is no longer in this RNC area. In some situations the RNC can request the release of the Iu signalling connection from the CN via the RANAP procedure IU RELEASE REQUEST. The reason for this message might be an RNC internal trigger or the UE has requested the release by SIGNALLING CONNECTION RELEASE MESSAGE. 53 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4. Security Mode Control 54 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4. Security Mode Control 4.1. Ciphering and Integrity Protection 55 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4.1. Ciphering and Integrity Protection Transmitter COUNT-I DIRECTION IK FRESH Integrity Protection COUNT-I Receiver DIRECTION IK FRESH f9 (UIA) f9 (UIA) f9 (UIA) f9 (UIA) XMAC-I RRC Message MAC-I RRC Message MAC-I COUNT-I RRC HFN RRC HFN (28 bit) 56 June 1, 2005 (28 bit) RRC SN (4) CONFIDENTIAL - DRAFT Alexander Seifarth 4.1. Ciphering and Integrity Protection DCCH RRC messages can be protected against change of information or message injection by an integrity protection mechanism. Therefore an algorithm f9 (UIA: UMTS Integrity Algorithm) must be available in UE and RNC. For each DCCH RRC message this algorithm calculates a message authentication code (MAC-I: Message Authentication Code – Integrity). This MAC-I is included in the message itself. At the receiver side the MAC-I is calculated again and cross-checked with the transmitted one. The algorithm UIA (f9) takes several additional values as input: • IK (Integrity Key): A UE specific key that is derived from authentication (automatic key agreement). • DIRECTION: Discriminates between uplink and downlink direction. • FRESH: An offset value that is allocated for uplink by UE and for downlink by RNC. The UL/DL-FRESH values are exchanged at set up of signalling radio bearers (RRC CONNECTION SETUP and RRC CONNECTION SETUP COMPLETE). • COUNT-I: This value is increased with every message that is transmitted. For initialisation of COUNT-I a START value is negotiated at radio bearer set up time. 57 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4.1. Ciphering and Integrity Protection Transmitter COUNT-C DIRECTION BEARER LENGTH Ciphering COUNT-C Receiver DIRECTION BEARER LENGTH CK f8 (UEA) f8 (UEA) Keystream Block CK f8 (UIA) f8 (UIA) Keystream Block Plaintext Block XOR Ciphertext Block XOR Plaintext Block COUNT-C for RLC TM on DCH COUNT-C for RLC UM COUNT-C for RLC AM 58 June 1, 2005 MAC-d RRC HFN (28 bit) HFN (24 bit) RRC HFN RLC HFN (25 bit) RLC HFN CONFIDENTIAL - DRAFT CFN SN (4 bit) (7 bit) (28 bit) RLC (20 bit) RLC SN (12 bit) Alexander Seifarth 4.1. Ciphering and Integrity Protection Like in GSM also UMTS allows an encryption with a classical stream cipher algorithm. The algorithm for production of the stream cipher sequence is called UEA (UMTS Encryption Algorithm) or f8. This algorithm uses several values as input: • CK (Cipher Key): A UE specific key that is coming from authentication (automatic key agreement). • BEARER: The radio bearer identity. • DIRECTION: Distinguishes between uplink and downlink direction. • LENGTH: Length of the cipher sequence to be produced. • COUNT-C: Strictly increasing value for each radio frame (RLC transparent mode) or RLC frame (RLC unacknowledged or acknowledged mode). COUNT-C is initialised with the START values that are exchanged at radio bearer set up time. 59 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4. Security Mode Control 4.2. Security Mode Activation 60 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4.2. Security Mode Activation UE RNC SGSN MSC Server RANAP Security Mode Command [DCCH] RLC/RRC AMD Security Mode Command. integrity protection info, ciphering info, … CN domain ID, security capability, inter-RAT security capability, ciphering mode info = {start/modify, selected UEA-no., RB activation time, DPCH activation time} integrity mode info = {start/modify, selected UIA-no., DL-FRESH, …} [DCCH] RLC/-acknowledgement STATUS [DCCH] RLC/RRC AMD Security Mode Complete integrity check info = {MAC-I, RRC SN for RB2}, uplink integrity protection activation info ={RRC SN for RB1-RB4}, RB ciphering activation time info = {RB-ID, RLC SN} [DCCH] RLC/-acknowledgement STATUS RANAP … Security Mode Complete 61 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4.2. Security Mode Activation |TS 25.331 DCCH-DL (2002-09) (RRC_DCCH_DL) securityModeCommand (= securityModeCommand) | |1 integrityCheckInfo |**b32*** |1.1 messageAuthenticationCode |'10110100100001111011101010000100'B |-0001--|1.2 rrc-MessageSequenceNumber |1 | |2 message | |2.1 securityModeCommand | |2.1.1 r3 | |2.1.1.1 securityModeCommand-r3 |***b2*** |2.1.1.1.1 rrc-TransactionIdentifier |0 | |2.1.1.1.2 securityCapability |**b16*** |2.1.1.1.2.1 cipheringAlgorithmCap |uea1 | | |uea0 |**b16*** |2.1.1.1.2.2 integrityProtectionAlgorithmCap |uia1 | |2.1.1.1.3 integrityProtectionModeInfo | |2.1.1.1.3.1 integrityProtectionModeCommand | |2.1.1.1.3.1.1 startIntegrityProtection |**b32*** |2.1.1.1.3.1.1.1 integrityProtInitNumber |'01000000110110110000111010010001'B | |2.1.1.1.3.2 integrityProtectionAlgorithm |uia1 |---0---|2.1.1.1.4 cn-DomainIdentity |cs-domain |TS 25.331 DCCH-UL (2002-09) (RRC_DCCH_UL) securityModeComplete (= securityModeComplete) | |1 integrityCheckInfo |**b32*** |1.1 messageAuthenticationCode |'11101010011001010000010001001011'B |-0001--|1.2 rrc-MessageSequenceNumber |1 | |2 message | |2.1 securityModeComplete |-----00|2.1.1 rrc-TransactionIdentifier |0 | |2.1.2 ul-IntegProtActivationInfo | |2.1.2.1 rrc-MessageSequenceNumberList |0000---|2.1.2.1.1 rRC-MessageSequenceNumber |0 |----0000 |2.1.2.1.2 rRC-MessageSequenceNumber |0 |0000---|2.1.2.1.3 rRC-MessageSequenceNumber |0 |----0000 |2.1.2.1.4 rRC-MessageSequenceNumber |0 |0000---|2.1.2.1.5 rRC-MessageSequenceNumber |0 62 June 1, 2005 CONFIDENTIAL - DRAFT | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Alexander Seifarth 4.2. Security Mode Activation Security functions are activated by the core network via the RANAP procedure Security Mode Control. This procedure is triggered with the message SECURITY MODE COMMAND. In this message the CN provides IK and CK to the RNC as well as a list of permitted UIA and UEA. The serving RNC has to select an UIA and an UEA that is supported by UE and RNC and is permitted by the CN. Then the security functions are activated by the RRC message SECURITY MODE COMMAND. In it one can find the selected algorithms. When the UE is able to activate the requested algorithms it returns SECURITY MODE COMPLETE. The same message but from RANAP protocol is also returned to the core network. 63 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5. Paging 64 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5. Paging 5.1. UTRAN Paging Types 65 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5.1. UTRAN Paging Types UTRAN Paging Paging Originator CN originated CN originated UTRAN originated UTRAN originated Request for Iu signalling connection Request for UE to enter CELL_FACH and perform Cell Update procedure Paging Type Paging Type 1 Paging Type 1 Paging Type 2 Paging Type 2 PCCH on PCH; may be used to page up to 8 UE DCCH on DCH or FACH 66 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5.1. UTRAN Paging Types Paging in UMTS can come from two different types of source – the paging originator: • CN originated paging: The CN triggers paging whenever a downlink signalling message shall be sent, but currently there is no Iu signalling connection for this UE at the CN domain of interest available (P/CMM_DETACHED state). Thus CN originated paging is a request for an Iu signalling connection. • UTRAN originated paging: The serving RNC has to trigger a paging whenever the UE is in state CELL_PCH or URA_PCH and a downlink message shall be sent to the UE. This paging shall force the UE to enter state CELL_FACH and perform a Cell Update procedure. A problem for UTRAN is the question on which channel to send the paging message. The RRC protocol provides two options: • Paging Type 1: The RRC message PAGING TYPE 1 is always sent on the PCH. Thus it can be used for UE in state Idle, CELL_PCH or URA_PCH. The PAGING TYPE 1 message can be used to page up to 8 UE in one single message. Furthermore the PAGING TYPE 1 message can also be used to indicate change of BCCH (BCCH Modification) or to release a UE from state CELL_PCH or URA_PCH to idle. • Paging Type 2: The message PAGING TYPE 2 is sent on either DCH or FACH. Thus it is the choice for UE in state CELL_DCH or CELL_FACH. Note that PAGING TYPE 2 is a dedicated control channel (DCCH) message, thus only one UE can be paged with such a message. 67 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5. Paging 5.2. CN originated paging 68 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5.2. CN originated paging UE RNC SGSN MSC Server RANAP Paging [P/DCCH] RLC/RRC TMD/AMD Paging Type 1|2 Type 1: Paging Record ={…, CN UE ID or U-RNTI + CN domain ID} Type 2: CN domain ID IF (UE idle) CN domain ID, UE identifier, paging area, paging cause [CCCH] RLC/RRC [CCCH] RLC/RRC [DCCH] RLC/RRC TMD RRC Connection Request UMD RRC Connection Setup AMD RRC Connection Setup Complete ... [DCCH] RLC/RRC AMD Initial Direct Transfer RANAP Initial UE Message NAS-Message CN domain ID, …, NAS-Message = RR:Paging Response|GMM:Service Request [DCCH] RLC/-- STATUS 69 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5.2. CN originated paging CN Triggered Paging |TS 25.331 PCCH (2002-03) (RRC_PCCH) pagingType1 (= pagingType1) | |pCCH-Message | |1 message | |1.1 pagingType1 | |1.1.1 pagingRecordList | |1.1.1.1 pagingRecord | |1.1.1.1.1 cn-Identity |110----|1.1.1.1.1.1 pagingCause |---0---|1.1.1.1.1.2 cn-DomainIdentity | |1.1.1.1.1.3 cn-pagedUE-Identity |**b32*** |1.1.1.1.1.3.1 tmsi-GSM-MAP | | | | | | | | | | | |terminatingCauseUnknown |cs-domain |'10110110000000000000000000100001'B BCCH Modification Indication |TS 25.331 PCCH (2002-03) (RRC_PCCH) pagingType1 (= pagingType1) | |pCCH-Message | |1 message | |1.1 pagingType1 | |1.1.1 bcch-ModificationInfo |-----010 |1.1.1.1 mib-ValueTag |***b9*** |1.1.1.2 bcch-ModificationTime | | | | | | | |3 |237 70 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5.2. CN originated paging CN originated paging is obviously triggered by the core network. MSC server or SGSN send the RANAP message PAGING to the RNC (or to several RNC). Inside the message the UE is identified (IMSI, TMSI/PTMSI) and the paging area (LAI/RAI) is indicated. The RNC determines the state of the UE by checking the IMSI. Then either PAGING TYPE 1 or PAGING TYPE 2 is sent on an appropriate downlink signalling transport channel. If the UE is in idle state, then it first of all performs a RRC connection setup procedure. If the UE is already in connected mode, it can skip this part. Then the UE has to trigger the Iu signalling connection to the requesting core network using the INITIAL DIRECT TRANSFER message. 71 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5. Paging 5.3. UTRAN originated paging 72 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5.3. UTRAN originated paging UE CELL_PCH URA_PCH RNC [PCCH] RLC/RRC TMD Paging Type 1 Type 1: Paging Record ={…, U-RNTI, RRC connection release indication=No Release|Release Cause} IF (RRC connection release indication = NoRelease) [CCCH] RLC/RRC [CCCH] RLC/RRC TMD Cell Update UMD Cell Update Confirm U-RNTI, cell update cause = paging response, … U-RNTI, new U-RNTI, new C-RNTI, RRC state indicator, RB info, TrCH info, PhCH info, … [CCCH] RLC/RRC UMD RRC Connection Release OR U-RNTI, new U-RNTI, new C-RNTI, RRC state indicator, RB info, TrCH info, PhCH info, … IF (RRC connection release indication = ReleaseCause UE enters UTRA IDLE mode 73 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5.3. UTRAN originated paging In case the paging is originated by the serving RNC there is no ‚CN Domain‘ information element inside the PAGING TYPE 1 message. The UE will enter state CELL_FACH on reception of an UTRAN originated paging. Then the UE will send a CELL UPDATE message on RACH (CCCH). Inside it will identify itself with the u-rnti and the parameter ‚cell update cause‘ is set to „paging response“. The RNC has now two options. Either it sends the CELL UPDATE CONFIRM message on FACH to the UE and indicates with this a new state and radio configuration to the UE. Or the RNC sends RRC CONNECTION RELEASE, so that the UE immediately enters idle mode. Since UMTS Release 5 the PAGING TYPE 1 message can contain a release indicator. If this is set to „release“, the UE will not perform the CELL UPDATE, instead it silently enters idle mode without any further interaction with the RNC. 74 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6. Radio Resource Management 75 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6. Radio Resource Management 6.1. Radio Bearer and Radio Access Bearer Setup 76 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6.1 RB and RAB Setup UE RNC SGSN MSC Server RANAP RAB Assignment Request RAB to setup or Modify, RAB to release [DCCH] RLC/RRC UMD/AMD Radio Bearer Setup …, RRC state indicator, signalling radio bearer, radio access bearers radio bearers (user data) transport channel to add/delete, physical channel configuration [DCCH] RLC/RRC … AMD Radio Bearer Setup Complete RANAP RAB Assignment Response successful RAB setup, failed RAB setup 77 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6.1 RB and RAB Setup +--------+----------------+--------------------+------------+------------+------------+--------------------------+ |No |Long Time |From |2. Prot |2. MSG |3. Prot |3. MSG | +--------+----------------+--------------------+------------+------------+------------+--------------------------+ |97 |12:01:15,470,365|NB #2 (DCH #1 DL) |RLC/MAC |FP DATA DCH | | | |98 |12:01:15,510,323|NB #2 (DCH #1 DL) |RLC/MAC |FP DATA DCH | | | |99 |12:01:15,550,476|NB #2 (DCH #1 DL) |RLC/MAC |FP DATA DCH | | | |100 |12:01:15,590,240|NB #2 (DCH #1 DL) |RLC/MAC |FP DATA DCH | | | |101 |12:01:15,630,489|NB #2 (DCH #1 DL) |RLC/MAC |FP DATA DCH | | | |102 |12:01:15,670,155|NB #2 (DCH #1 DL) |RLC/MAC |FP DATA DCH | | | |103 |12:01:15,710,405|NB #2 (DCH #1 DL) |RLC/MAC |FP DATA DCH | | | |104 |12:01:15,750,364|NB #2 (DCH #1 DL) |RLC/MAC |FP DATA DCH | | | |105 |12:01:15,750,364|NB #2 (DCH #1 DL) |RLC reasm. |AM DATA DCH |RRC_DCCH_DL |radioBearerSetup | |106 |12:01:15,967,569|NB #2 (DCH #1 UL) |RLC/MAC |FP DATA DCH | | | |109 |12:01:17,327,602|NB #2 (DCH #1 UL) |RLC/MAC |FP DATA DCH | | | |110 |12:01:17,327,602|NB #2 (DCH #1 UL) |RLC reasm. |AM DATA DCH |RRC_DCCH_UL |radioBearerSetupComplete | 78 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6.1 RB and RAB Setup The radio bearers for RRC signalling are usually set up via RRC CONNECTION SETUP. Radio bearers for user data (especially DTCH/CTCH, but not exclusively) cannot be created with this operation. The general radio bearer establishment is provided by the RADIO BEARER SETUP procedure implemented by RRC protocol. This operation can be used to create any kind of radio bearer. When radio bearers for applications like calls or PDP context shall be created, then the RADIO BEARER SETUP is part of the radio access bearer establishment triggered by core network. This is done via the RANAP message RAB ASSIGNMENT REQUEST. This message is used for set up, modification and release of radio access bearers. When a RAB is created or modified, then the serving RNC calculates how many radio bearers with which settings are required and creates these radio bearers with the RADIO BEARER SETUP procedure. In it the UE also gets an indication about the radio access bearers created. When the new radio bearers are allocated by the UE it will respond with RADIO BEARER SETUP COMPLETE, this will in the end effect also trigger the RAB ASSIGNMENT RESPONSE message of RANAP back to the core network. This RANAP message contains parameters that indicate success or failure of the procedure. 79 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6. Radio Resource Management 6.2. Radio Bearer and Radio Access Bearer Release 80 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6.2. RB and RAB Release UE RNC SGSN MSC Server RANAP RAB Assignment Request RAB to setup or Modify, RAB to release [DCCH] RLC/RRC UMD/AMD Radio Bearer Release …, RRC state indicator, radio access bearers to reconfigure list transport channel to add/delete, physical channel configuration [DCCH] RLC/RRC … AMD Radio Bearer Release Complete RANAP RAB Assignment Response successful RAB setup, failed RAB setup [DCCH] RLC/RRC UMD/AMD Radio Bearer Release RANAP Iu Release Command …, RRC state indicator, signalling connection release indication = ps|cs radio access bearers to reconfigure list transport channel to add/delete, physical channel configuration [DCCH] RLC/RRC … AMD Radio Bearer Release Complete RANAP Iu Release Complete RAB released 81 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6.2. RB and RAB Release To release radio bearers the RADIO BEARER RELEASE procedure is provided by RRC protocol. It can be used to release individual radio bearers or complete radio access bearers with all associated radio bearers and the procedure can also trigger RRC state changes. The RNC can in principle release a radio bearer at any time without involution of the core network. If this is really done, depends on the traffic class of the radio access bearer. Because of delay problems when a radio bearer is to be reestablished, such a Radio Access Bearer independent Radio Bearer management is not done for conversational or streaming traffic classes. Only background and interactive traffic class radio access bearers allow such a radio bearer management without involution of CN. Of course radio bearers have to be released whenever the radio access bearer of the service is terminated. A radio access bearer can be released in two ways. Either the CN uses again the RANAP procedure RAB ASSIGNMENT REQUEST with a RAB release indication or the CN releases the Iu signalling connection with IU RELEASE COMMAND. In the latter case all RAB for this UE of to the releasing core network have to be terminated. The RNC can upon one of these two procedures release the associated radio bearers with RADIO BEARER RELEASE, the UE has to respond with RADIO BEARER RELEASE COMPLETE. Of course there is another final way to release all radio bearers. When the UE is sent to idle state by the RRC message RRC CONNECTION RELEASE automatically all radio bearers will be terminated. This option is used after the IU RELEASE COMMAND when no Iu signalling connection is left at the end of the procedure. 82 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6. Radio Resource Management 6.3. Reconfiguration Operations 83 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6.3. Reconfiguration Operations UE UMD/AMD Radio Bearer Reconfiguration RNC [DCCH] RLC/RRC New U-RNTI, new C-RNTI, new DSCH-RNTI, new H-RNTI, RRC state indicator, RB to reconfigure, transport channels to add/delete/modify, physical channel configuration [DCCH] RLC/RRC … AMD Radio Bearer Reconfiguration Complete [DCCH] RLC/RRC UMD/AMD Transport Channel Reconfiguration New U-RNTI, new C-RNTI, new DSCH-RNTI, new H-RNTI, RRC state indicator, transport channels to add/delete/modify, physical channel configuration [DCCH] RLC/RRC … AMD Transport Channel Reconfiguration Complete [DCCH] RLC/RRC UMD/AMD Physical Channel Reconfiguration New U-RNTI, new C-RNTI, new DSCH-RNTI, new H-RNTI, RRC state indicator, physical channel configuration [DCCH] RLC/RRC … 84 June 1, 2005 AMD Physical Channel Reconfiguration Complete CONFIDENTIAL - DRAFT Alexander Seifarth 6.3. Reconfiguration Operations Three main operations are provided in the RRC protocol to modify the current radio configuration of a UE. There are • RADIO BEARER RECONFIGURATION: This allows to modify physical channels (frequency, channelization codes, scrambling codes), transport channels (transport format sets, transport format combination sets, type of transport channels) and radio bearers itself. • TRANSPORT CHANNEL RECONFIGURATION: This procedure allows to modify transport channels and physical channels. Radio bearers are not affected by this procedure. • PHYSICAL CHANNEL RECONFIGURATION: This allows to modify physical channels only. Depending on what shall be modified the serving RNC has to select one of these procedures. If only transport format combinations shall be allowed or blocked there is another procedure – the TRANSPORT FORMAT COMBINATION CONTROL operation. This is not really a reconfiguration, because the channels and radio bearers are not modified by it. The reconfiguration operations can be used to implement hard handover procedures on the same frequency or to other frequency (inter-frequency handover). They cannot be used for soft handover (see active set update procedure) or to perform inter-system (inter-RAT) handover (see HANDOVER FROM UTRAN COMMAND). 85 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6. Radio Resource Management 6.4. Inter-System Change Operations 86 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6.4. Inter-System Change Operations Handover From UTRAN UE [DCCH] RLC/RRC [DCCH] RLC/RRC [DCCH] RLC/RRC … other RAT (e.g. GSM BSS) Core Network Source RNC AMD/UMD UE Capability Enquiry AMD UE Capability Information capability update requirement UE radio access capability, other RAT capabilities AMD/UMD UE Capability Information Confirm other system’s handover message [DCCH] RLC/RRC AMD Handover From UTRAN Command other system’s handover message, … RAB to handover list, other RAT system information [DCCH] RLC/-SUFI: Acknowledgement STATUS other system’s handover completion 87 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6.4. Inter-System Change Operations To change from UMTS WCDMA FDD mode to another radio access technology (RAT) there are inter-system (inter-RAT) procedures defined. Before a UE can go to another RAT it might be necessary to retrieve the UE’s capabilities with respect to this RAT. If these RAT capabilities are not available yet at the serving RNC a capability enquiry procedure has to be performed. During this procedure the RNC request the updated capabilities with UE CAPABILITY ENQUIRY from the UE, which will respond with a UE CAPABILITY INFO message back to the RNC. This message contains the UE capabilities as requested before by the UE CAPABILITY ENQUIRY message. The RNC confirms reception of the parameters by sending UE CAPABILITY INFO CONFIRM. When the handover to the other RAT shall be started typically a so called S-RNS Relocation procedure (not shown here) is started. During this relocation the new RAT radio network controller (whatever this might be) sends an appropriate handover command over the core network to the serving RNC. This will take it and pack it into a HANDOVER FROM UTRAN COMMAND, which is sent to the UE. The UE now changes the radio access system and completes the handover procedure in the new radio subsystem. 88 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6.4. Inter-System Change Operations Handover To UTRAN UE RRC other RAT (e.g. GSM BSS) Core Network Target RNC Inter-RAT Handover Info Signalling transfer “Inter-RAT Handover Info” UE radio access capabilities, pre-defined configuration status information RRC Handover To UTRAN Command new U-RNTI, ciphering algorithm, signalling radio bearer to setup, RAB and radio bearer to setup, transport channels to add, physical channel configuration Signalling transfer “Handover To UTRAN Command” [DCCH] RLC/RRC … AMD Handover To UTRAN Complete [DCCH] RLC/-SUFI: Acknowledgement STATUS 89 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6.4. Inter-System Change Operations A handover to UTRAN is of course triggered by the other RAT that is used by the UE in the moment. Before a handover to UTRAN is started usually the new RNC (target RNC) has to get the UE capabilities with respect to WCDMA FDD mode. Therefore the other RAT requests the UE WCDMA capabilities and forwards it over the CN to the target RNC. This is embedded in a S-RNC relocation procedure, but this time the RNC is the destination of the procedure, not the source. When the target RNC has the UE capabilities it will prepare all resources for it and then create a HANDOVER TO UTRAN COMMAND. This command is sent over the core network to the radio controller of the other RAT. From here the message finds its way to the UE. How this is done depends on the other RAT. Now the UE switches to the WCDMA FDD cell and completes the handover with the message HANDOVER TO UTRAN COMPLETE. 90 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6.4. Inter-System Change Operations Network Ordered Cell Change To Other RAT UE [DCCH] RLC/RRC target cell description, … other RAT (e.g. GSM BSS) Source RNC AMD Cell Change Order From UTRAN [DCCH] RLC/-SUFI: Acknowledgement STATUS update procedures corresponding to new system 91 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6.4. Inter-System Change Operations There is a second possibility to change from UTRAN to another radio access technology. This option is especially designed for UMTS (CELL_FACH) to GSM (Packet Transfer Mode). Here we use a network ordered cell change to switch away from UMTS to another RAT. The RNC give the CELL CHANGE ORDER FROM UTRAN command to the UE. In this message the new cell of the other RAT is indicated. The UE now performs a forced cell reselection to the new cell. All cell reselection criteria for automatic cell reselection are ignored at the UE. The remaining part of the procedure consists possibly of an update procedure in the new RAT. This is out of scope of UTRAN. 92 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6. Radio Resource Management 6.5. Active Set Management (Soft Handover) 93 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6.5. Active Set Management (Soft Handover) UE RNC [DCCH] RLC/RRC Radio link addition info Radio link removal info AMD/UMD Active Set Update {primary CPICH info = primary DL scrambling code, cell identity, downlink DPCH info, …} {primary CPICH info = primary DL scrambling code} [DCCH] RLC/RRC AMD Active Set Update Complete 94 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 6.5. Active Set Management (Soft Handover) Soft handover consists of operations to add, delete and replace cells from the so called active set. The procedure that provides this functionality is the ACTIVE SET UPDATE. In an ACTIVE SET UPDATE message the serving RNC indicates the cells that are to be added to the active set and the cells that must be removed from it. Whenever the UE receives such an ACTIVE SET UPDATE it immediately performs the requested operations and returns the ACTIVE SET UPDATE COMPLETE message. 95 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 7. UE Measurements 96 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 7. Measurements 7.1. Measurement Types and Reporting 97 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 7.1. Measurement Types and Reporting 1) Intra Frequency Measurements 2) Inter Frequency Measurements WCDMA physical layer TrCH #0 ... TrCH #N 3) Inter RAT Measurements 5) Quality Measurements 6) UE Internal Measurements 7) Positioning Measurements 4) Traffic Volume Measurements RLC/MAC ... RRC Measurement Control | SIB 3/4+11/12 RRC Periodical Measurements - Filtering - Reporting criteria evaluation RNC RRC Measurement Report 98 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 7.1. Measurement Types and Reporting UE Measurements in UTRAN are divided into seven categories as shown on the slide. Every measurement in a UE has to be created before it starts. Therefore a MEASUREMENT CONTROL message is provided. Additionally SIB 3/4 and SIB 11/12 can create measurements. Reporting of measurements can be done either periodically or by event trigger. Which reporting mode for a created measurement is to chosen is indicated in the associated MEASUREMENT CONTROL message. When a trigger for a report is fulfilled then the UE sends MEASUREMENT REPORT uplink to the RNC which contains the measured results (filtered by UE) and the indication of the event that triggered the report (only for even triggered reporting). 99 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 7. Measurements 7.2. Measurement Control and Report Procedure 100 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 7.2. Measurement Control and Report Procedure UE RNC [DCCH] RLC/RRC AMD Measurement Control measurement identity, measurement control command = setup, release, modify, measurement type, measurement reporting mode {RLC mode = AMD|UMD, trigger = periodical|event}, … [DCCH] RLC/-- STATUS [DCCH] RLC/RRC AMD/UMD Measurement Report measurement identity, measurement control command = setup, release, modify, measurement type, measurement reporting mode {RLC mode = AMD|UMD, trigger = periodical|event}, … [DCCH] RLC/-- STATUS 101 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 7.2. Measurement Control and Report Procedure Measurement Control 1(4) |TS 25.331 DCCH-DL (2002-03) (RRC_DCCH_DL) measurementControl (= measurementControl) |dL-DCCH-Message | |1 integrityCheckInfo |**b32*** |1.1 messageAuthenticationCode |'11101001001100000100101100101000'B |-0011--|1.2 rrc-MessageSequenceNumber |3 | |2 message | |2.1 measurementControl | |2.1.1 r3 | |2.1.1.1 measurementControl-r3 |***b2*** |2.1.1.1.1 rrc-TransactionIdentifier |2 |-1000--|2.1.1.1.2 measurementIdentity |9 | |2.1.1.1.3 measurementCommand | |2.1.1.1.3.1 setup | |2.1.1.1.3.1.1 intraFrequencyMeasurement | |2.1.1.1.3.1.1.1 intraFreqCellInfoList | |2.1.1.1.3.1.1.1.1 removedIntraFreqCellList | |2.1.1.1.3.1.1.1.1.1 removeAllIntraFreqCells |0 | |2.1.1.1.3.1.1.1.2 newIntraFreqCellList | |2.1.1.1.3.1.1.1.2.1 newIntraFreqCell |--00000|2.1.1.1.3.1.1.1.2.1.1 intraFreqCellID |0 | |2.1.1.1.3.1.1.1.2.1.2 cellInfo |-000000|2.1.1.1.3.1.1.1.2.1.2.1 cellIndividualOffset |-20 | |2.1.1.1.3.1.1.1.2.1.2.2 modeSpecificInfo | |2.1.1.1.3.1.1.1.2.1.2.2.1 fdd | |2.1.1.1.3.1.1.1.2.1.2.2.1.1 primaryCPICH-Info |***b9*** |2.1.1.1.3.1.1.1.2.1.2.2.1.1.1 primaryScramb.. |3 |***b6*** |2.1.1.1.3.1.1.1.2.1.2.2.1.2 primaryCPICH-TX.. |30 |-1-----|2.1.1.1.3.1.1.1.2.1.2.2.1.3 readSFN-Indicator |1 |--0----|2.1.1.1.3.1.1.1.2.1.2.2.1.4 tx-DiversityInd.. |0 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 102 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 7.2. Measurement Control and Report Procedure Measurement Control 2(4) | |***b5*** | |***b6*** | | | |***b9*** |***b6*** |---1---|----0--| |***b5*** | |***b6*** | | | |***b9*** |***b6*** |-----1-|------0| | | | |-00----| | |----00-|------0|-------1 103 June 1, 2005 |2.1.1.1.3.1.1.1.2.2 newIntraFreqCell |2.1.1.1.3.1.1.1.2.2.1 intraFreqCellID |2.1.1.1.3.1.1.1.2.2.2 cellInfo |2.1.1.1.3.1.1.1.2.2.2.1 cellIndividualOffset |2.1.1.1.3.1.1.1.2.2.2.2 modeSpecificInfo |2.1.1.1.3.1.1.1.2.2.2.2.1 fdd |2.1.1.1.3.1.1.1.2.2.2.2.1.1 primaryCPICH-Info |2.1.1.1.3.1.1.1.2.2.2.2.1.1.1 primaryScramb.. |2.1.1.1.3.1.1.1.2.2.2.2.1.2 primaryCPICH-TX.. |2.1.1.1.3.1.1.1.2.2.2.2.1.3 readSFN-Indicator |2.1.1.1.3.1.1.1.2.2.2.2.1.4 tx-DiversityInd.. |2.1.1.1.3.1.1.1.2.3 newIntraFreqCell |2.1.1.1.3.1.1.1.2.3.1 intraFreqCellID |2.1.1.1.3.1.1.1.2.3.2 cellInfo |2.1.1.1.3.1.1.1.2.3.2.1 cellIndividualOffset |2.1.1.1.3.1.1.1.2.3.2.2 modeSpecificInfo |2.1.1.1.3.1.1.1.2.3.2.2.1 fdd |2.1.1.1.3.1.1.1.2.3.2.2.1.1 primaryCPICH-Info |2.1.1.1.3.1.1.1.2.3.2.2.1.1.1 primaryScramb.. |2.1.1.1.3.1.1.1.2.3.2.2.1.2 primaryCPICH-TX.. |2.1.1.1.3.1.1.1.2.3.2.2.1.3 readSFN-Indicator |2.1.1.1.3.1.1.1.2.3.2.2.1.4 tx-DiversityInd.. |2.1.1.1.3.1.1.2 intraFreqMeasQuantity |2.1.1.1.3.1.1.2.1 filterCoefficient |2.1.1.1.3.1.1.2.2 modeSpecificInfo |2.1.1.1.3.1.1.2.2.1 fdd |2.1.1.1.3.1.1.2.2.1.1 intraFreqMeasQuantity.. |2.1.1.1.3.1.1.3 intraFreqReportingQuantity |2.1.1.1.3.1.1.3.1 activeSetReportingQuantities |2.1.1.1.3.1.1.3.1.1 sfn-SFN-OTD-Type |2.1.1.1.3.1.1.3.1.2 cellIdentity-reportingI.. |2.1.1.1.3.1.1.3.1.3 cellSynchronisationInfo.. CONFIDENTIAL - DRAFT |1 |-20 |5 |30 |1 |0 |2 |-18 |1 |30 |1 |0 |fc0 |cpich-Ec-N0 |noReport |0 |1 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Alexander Seifarth 7.2. Measurement Control and Report Procedure Measurement Control 3(4) | | |-1-----|--0----|---0---| |----00-|------0|-------1 | | |-1-----|--0----|---0---| | | | | | |001----|---00011 |00000--|-----010 |111----|---011-|***b4*** |--0000-| |--100--|2.1.1.1.3.1.1.3.1.4 modeSpecificInfo |2.1.1.1.3.1.1.3.1.4.1 fdd |2.1.1.1.3.1.1.3.1.4.1.1 cpich-Ec-N0-reporti.. |2.1.1.1.3.1.1.3.1.4.1.2 cpich-RSCP-reportin.. |2.1.1.1.3.1.1.3.1.4.1.3 pathloss-reportingI.. |2.1.1.1.3.1.1.3.2 monitoredSetReportingQuantities |2.1.1.1.3.1.1.3.2.1 sfn-SFN-OTD-Type |2.1.1.1.3.1.1.3.2.2 cellIdentity-reportingI.. |2.1.1.1.3.1.1.3.2.3 cellSynchronisationInfo.. |2.1.1.1.3.1.1.3.2.4 modeSpecificInfo |2.1.1.1.3.1.1.3.2.4.1 fdd |2.1.1.1.3.1.1.3.2.4.1.1 cpich-Ec-N0-reporti.. |2.1.1.1.3.1.1.3.2.4.1.2 cpich-RSCP-reportin.. |2.1.1.1.3.1.1.3.2.4.1.3 pathloss-reportingI.. |2.1.1.1.3.1.1.4 reportCriteria |2.1.1.1.3.1.1.4.1 intraFreqReportingCriteria |2.1.1.1.3.1.1.4.1.1 eventCriteriaList |2.1.1.1.3.1.1.4.1.1.1 intraFreqEventCriteria |2.1.1.1.3.1.1.4.1.1.1.1 event |2.1.1.1.3.1.1.4.1.1.1.1.1 e1a |2.1.1.1.3.1.1.4.1.1.1.1.1.1 triggeringCondi.. |2.1.1.1.3.1.1.4.1.1.1.1.1.2 reportingRange |2.1.1.1.3.1.1.4.1.1.1.1.1.3 w |2.1.1.1.3.1.1.4.1.1.1.1.1.4 reportDeactivat.. |2.1.1.1.3.1.1.4.1.1.1.1.1.5 reportingAmount |2.1.1.1.3.1.1.4.1.1.1.1.1.6 reportingInterval |2.1.1.1.3.1.1.4.1.1.1.2 hysteresis |2.1.1.1.3.1.1.4.1.1.1.3 timeToTrigger |2.1.1.1.3.1.1.4.1.1.1.4 reportingCellStatus |2.1.1.1.3.1.1.4.1.1.1.4.1 allActiveplusMoni.. |1 |0 |0 |noReport |0 |1 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |1 |0 |0 |monitoredSetCellsOnly |3 |0 |t2 |ra-Infinity |ri1 |0 |ttt0 |viactCellsPlus5 104 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 7.2. Measurement Control and Report Procedure Measurement Control 4(4) | | | |---00--|***b5*** |--00000|***b4*** |---0000| |---010-| | | |---011-|***b3*** |-000---|----0000 |0000---| |100----| |---0---|----1--|2.1.1.1.3.1.1.4.1.1.2 intraFreqEventCriteria |2.1.1.1.3.1.1.4.1.1.2.1 event |2.1.1.1.3.1.1.4.1.1.2.1.1 e1b |2.1.1.1.3.1.1.4.1.1.2.1.1.1 triggeringCondi.. |2.1.1.1.3.1.1.4.1.1.2.1.1.2 reportingRange |2.1.1.1.3.1.1.4.1.1.2.1.1.3 w |2.1.1.1.3.1.1.4.1.1.2.2 hysteresis |2.1.1.1.3.1.1.4.1.1.2.3 timeToTrigger |2.1.1.1.3.1.1.4.1.1.2.4 reportingCellStatus |2.1.1.1.3.1.1.4.1.1.2.4.1 withinActiveSet |2.1.1.1.3.1.1.4.1.1.3 intraFreqEventCriteria |2.1.1.1.3.1.1.4.1.1.3.1 event |2.1.1.1.3.1.1.4.1.1.3.1.1 e1c |2.1.1.1.3.1.1.4.1.1.3.1.1.1 replacementActi.. |2.1.1.1.3.1.1.4.1.1.3.1.1.2 reportingAmount |2.1.1.1.3.1.1.4.1.1.3.1.1.3 reportingInterval |2.1.1.1.3.1.1.4.1.1.3.2 hysteresis |2.1.1.1.3.1.1.4.1.1.3.3 timeToTrigger |2.1.1.1.3.1.1.4.1.1.3.4 reportingCellStatus |2.1.1.1.3.1.1.4.1.1.3.4.1 allActiveplusMoni.. |2.1.1.1.4 measurementReportingMode |2.1.1.1.4.1 measurementReportTransferMode |2.1.1.1.4.2 periodicalOrEventTrigger | | | | | | | | | | | | | | | | | | | | | | | |activeSetCellsOnly |3 |0 |0 |ttt0 |e3 |t3 |ra1 |noPeriodicalreporting |0 |ttt0 |viactCellsPlus5 |acknowledgedModeRLC |eventTrigger 105 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 7.2. Measurement Control and Report Procedure Measurement Report 1(2) |TS 25.331 DCCH-UL (2002-03) (RRC_DCCH_UL) measurementReport (= measurementReport) | |uL-DCCH-Message | | |1 integrityCheckInfo | |**b32*** |1.1 messageAuthenticationCode |'11111000011011110101100100001111'B| |-0100--|1.2 rrc-MessageSequenceNumber |4 | | |2 message | | |2.1 measurementReport | |***b4*** |2.1.1 measurementIdentity |14 | | |2.1.2 measuredResults | | |2.1.2.1 intraFreqMeasuredResultsList | | |2.1.2.1.1 cellMeasuredResults | | |2.1.2.1.1.1 cellSynchronisationInfo | | |2.1.2.1.1.1.1 modeSpecificInfo | | |2.1.2.1.1.1.1.1 fdd | | |2.1.2.1.1.1.1.1.1 countC-SFN-Frame-difference | |0000---|2.1.2.1.1.1.1.1.1.1 countC-SFN-High |0 | |***b8*** |2.1.2.1.1.1.1.1.1.2 off |6 | |**b16*** |2.1.2.1.1.1.1.1.2 tm |16896 | | |2.1.2.1.1.2 modeSpecificInfo | | |2.1.2.1.1.2.1 fdd | | |2.1.2.1.1.2.1.1 primaryCPICH-Info | |***b9*** |2.1.2.1.1.2.1.1.1 primaryScramblingCode |3 | |-100101|2.1.2.1.1.2.1.2 cpich-Ec-N0 |37 | 106 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 7.2. Measurement Control and Report Procedure Measurement Report 2(2) | | | | | |----0000 |00000110 |***B2*** | | | |***b9*** |***b6*** | | |***b4*** | | | |***b9*** |2.1.2.1.2 cellMeasuredResults |2.1.2.1.2.1 cellSynchronisationInfo |2.1.2.1.2.1.1 modeSpecificInfo |2.1.2.1.2.1.1.1 fdd |2.1.2.1.2.1.1.1.1 countC-SFN-Frame-difference |2.1.2.1.2.1.1.1.1.1 countC-SFN-High |2.1.2.1.2.1.1.1.1.2 off |2.1.2.1.2.1.1.1.2 tm |2.1.2.1.2.2 modeSpecificInfo |2.1.2.1.2.2.1 fdd |2.1.2.1.2.2.1.1 primaryCPICH-Info |2.1.2.1.2.2.1.1.1 primaryScramblingCode |2.1.2.1.2.2.1.2 cpich-Ec-N0 |2.1.3 eventResults |2.1.3.1 intraFreqEventResults |2.1.3.1.1 eventID |2.1.3.1.2 cellMeasurementEventResults |2.1.3.1.2.1 fdd |2.1.3.1.2.1.1 primaryCPICH-Info |2.1.3.1.2.1.1.1 primaryScramblingCode | | | | | | | | | | | | | | | | | | | | |0 |6 |17372 |1 |15 |e1a |3 107 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth Module 04 Complete Sequences – Use Cases (Layer 3 signalling) Version 0.0.1 (02/05/2005) Author: Alexander Seifarth ([email protected]) 1 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1. CS Mobility Management 2 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1. CS Mobility Management 1.1. Location Area Update • • • • UE is UTRA idle; UE is PS detached; performs cell reselection no services follow after update 3 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.1. Location Area Update (1) UE UTRA_Idle cell reselection New LAI ? true false RNC MSC Server [CCCH] RRC [CCCH] RRC RRC Connection Request RRC Connection Setup Initial UE ID = IMSI|TMSI+LAI, Est.Cause = registration U-RNTI, C-RNTI, signalling radio bearer RB1..RB4, TrCH configuration, PhCH configuration, radio access capability update requirement [DCCH] RRC CELL_DCH|CELL_FACH RRC Connection Setup Complete UE radio access capabilities [DCCH] RRC Initial Direct Transfer CN domain = cs, NAS-PDU = MM-message: Location Updating Request CN domain = cs, LAI, SAI, RNC-ID, NAS-PDU = Location Updating Request 4 June 1, 2005 CONFIDENTIAL - DRAFT RANAP Initial UE Message Alexander Seifarth 1.1. Location Area Update (2) UE RNC RANAP Direct Transfer SAPI=0, NAS-PDU = Authentication Req. MSC Server [DCCH] RRC [DCCH] RRC Downlink Direct Transfer Uplink Direct Transfer CN domain = cs, NAS-PDU = MM-message: Authentication Request CN domain = cs, NAS-PDU = MM-message: Authentication Response RANAP Direct Transfer LAI, SAI, NAS-PDU = Authentication Resp. [DCCH] RRC [DCCH] RRC … Security Mode Command Security Mode Complete RANAP Security Mode Command permitted UIA, IK, permitted UEA, CK, … selected UIA, selected UEA, ciphering activation time, … RANAP Security Mode Command selected UIA, selected UEA [DCCH] RRC Downlink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Location Updating Accept CN domain = cs, NAS-PDU = MM-message: Location Updating Accept [DCCH] RRC Uplink Direct Transfer CN domain = cs, NAS-PDU = MM-message: TMSI Reallocation Compl. RANAP Direct Transfer LAI, SAI, NAS-PDU = TMSI Realloc. Compl. 5 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.1. Location Area Update (3) UE RNC MSC Server RANAP Iu Release Command [DCCH] RRC [DCCH] RRC UTRA_Idle RRC Connection Release RRC Connection Release Complete cause = normal event cause = normal event, N308 (only for CELL_DCH) RANAP Iu Release Complete 6 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1. CS Mobility Management 1.2. IMSI Detach (UE Power Off) • UE is UTRA idle; • UE is PS detached; • user switches UE off 7 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.2. IMSI Detach (UE Power Off) (1) UE UTRA_Idle Power Off (User) ATT=true true false Power Off RNC [BCCH] RRC …, ATT, … MSC Server SIB 1 [CCCH] RRC [CCCH] RRC RRC Connection Request RRC Connection Setup Initial UE ID = IMSI|TMSI+LAI, Est.Cause = detach U-RNTI, C-RNTI, signalling radio bearer RB1..RB4, TrCH configuration, PhCH configuration, radio access capability update requirement [DCCH] RRC CELL_DCH|CELL_FACH RRC Connection Setup Complete UE radio access capabilities [DCCH] RRC Initial Direct Transfer CN domain = cs, NAS-PDU = MM-message: IMSI Detach Indication RANAP Initial UE Message CN domain = cs, LAI, SAI, RNC-ID, NAS-PDU = IMSI Detach Indication 8 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 1.2. IMSI Detach (UE Power Off) (2) UE RNC SCCP MSC Server Connection Refused [DCCH] RRC [DCCH] RRC UTRA_Idle Power Off RRC Connection Release RRC Connection Release Complete Cause = normal event | unspecified, N308 (only CELL_DCH) 9 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2. CS Call Services 10 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2. CS Call Services 2.1. Mobile Originating Call (MOC) • • • • UE is UTRA idle; no PS services running, no other CS services except the MOC no handovers during call call release by remote party 11 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.1. Mobile Originating Call (MOC) (1) UE UTRA_Idle call request (User) RNC MSC Server [CCCH] RRC RRC Connection Request Initial UE ID = IMSI|TMSI+LAI, Est.Cause = originating conversational call [CCCH] RRC RRC Connection Setup U-RNTI, C-RNTI, signalling radio bearer RB1..RB4, TrCH configuration, PhCH configuration, radio access capability update requirement [DCCH] RRC RRC Connection Setup Complete UE radio access capabilities CELL_DCH|CELL_FACH [DCCH] RRC Initial Direct Transfer CN domain = cs, NAS-PDU = MM-message: CM Service Request RANAP Initial UE Message CN domain = cs, LAI, SAI, RNC-ID, NAS-PDU = CM Service Request 12 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.1. Mobile Originating Call (MOC) (2) UE RNC RANAP Direct Transfer SAPI=0, NAS-PDU = Authentication Req. MSC Server [DCCH] RRC [DCCH] RRC Downlink Direct Transfer Uplink Direct Transfer CN domain = cs, NAS-PDU = MM-message: Authentication Request CN domain = cs, NAS-PDU = MM-message: Authentication Response RANAP Direct Transfer LAI, SAI, NAS-PDU = Authentication Resp. [DCCH] RRC [DCCH] RRC … Security Mode Command Security Mode Complete RANAP Security Mode Command permitted UIA, IK, permitted UEA, CK, … selected UIA, selected UEA, ciphering activation time, … RANAP Security Mode Command selected UIA, selected UEA [DCCH] RRC Uplink Direct Transfer CN domain = cs, NAS-PDU = CC-message: Setup RANAP Direct Transfer LAI, SAI, NAS-PDU = Setup [DCCH] RRC Downlink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Call Proceeding CN domain = cs, NAS-PDU = CC-message: Call Proceeding 13 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.1. Mobile Originating Call (MOC) (3) UE RNC MSC Server RANAP RAB Assignment Request RABSetupOrModifyItem RAB Parameter [DCCH] RRC Radio Bearer Setup RRC state = CELL_DCH, RAB to setup radio bearer to setup, signalling radio bearer, transport channels to add, physical channel [DCCH] RRC CELL_DCH Radio Bearer Setup Complete RANAP RAB Assignment Response successful setup [DCCH] RRC Downlink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Alerting CN domain = cs, NAS-PDU = CC-message: Alerting [DCCH] RRC [DCCH] RRC Downlink Direct Transfer Uplink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Connect CN domain = cs, NAS-PDU = CC-message: Connect CN domain = cs, NAS-PDU = CC-message: Connect Ackn. RANAP Direct Transfer LAI, SAI, NAS-PDU = Connect Ackn. call active 14 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.1. Mobile Originating Call (MOC) (4) UE RNC MSC Server [DCCH] RRC [DCCH] RRC Downlink Direct Transfer Uplink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Disconnect CN domain = cs, NAS-PDU = CC-message: Disconnect CN domain = cs, NAS-PDU = CC-message: Release RANAP Direct Transfer LAI, SAI, NAS-PDU = Release [DCCH] RRC Downlink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Release Complete CN domain = cs, NAS-PDU = CC-message: Release Complete [DCCH] RRC cause = normal event RRC Connection Release RRC Connection Release Complete RANAP Iu Release Command cause = normal event RANAP Iu Release Complete released RAB [DCCH] RRC UTRA_Idle 15 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2. CS Call Services 2.2. Mobile Terminating Call (MTC) • UE is UTRA idle; • no other services running; • call release by local party 16 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. Mobile Terminating Call (MTC) (1) UE UTRA_Idle RNC RANAP Paging MSC Server [PCCH] RRC Paging Type 1 CN domain = cs, LAI, IMSI, TMSI, cause UE-ID = TMSI|IMSI, cause = terminating conversation call|terminating cause unknown [CCCH] RRC RRC Connection Request Initial UE ID = IMSI|TMSI+LAI, Est.Cause = terminating conversational call|terminating cause unknown [CCCH] RRC RRC Connection Setup U-RNTI, C-RNTI, signalling radio bearer RB1..RB4, TrCH configuration, PhCH configuration, radio access capability update requirement [DCCH] RRC RRC Connection Setup Complete UE radio access capabilities CELL_DCH|CELL_FACH [DCCH] RRC Initial Direct Transfer CN domain = cs, NAS-PDU = MM-message: Paging Response RANAP Initial UE Message CN domain = cs, LAI, SAI, RNC-ID, NAS-PDU = Paging Response 17 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. Mobile Terminating Call (MTC) (2) UE RNC RANAP Direct Transfer SAPI=0, NAS-PDU = Authentication Req. MSC Server [DCCH] RRC [DCCH] RRC Downlink Direct Transfer Uplink Direct Transfer CN domain = cs, NAS-PDU = MM-message: Authentication Request CN domain = cs, NAS-PDU = MM-message: Authentication Response RANAP Direct Transfer LAI, SAI, NAS-PDU = Authentication Resp. [DCCH] RRC [DCCH] RRC … Security Mode Command Security Mode Complete RANAP Security Mode Command permitted UIA, IK, permitted UEA, CK, … selected UIA, selected UEA, ciphering activation time, … RANAP Security Mode Command selected UIA, selected UEA [DCCH] RRC [DCCH] RRC Downlink Direct Transfer Uplink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Setup CN domain = cs, NAS-PDU = CC-message: Setup CN domain = cs, NAS-PDU = CC-message: Call Confirmed RANAP Direct Transfer LAI, SAI, NAS-PDU = Call Confirmed 18 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. Mobile Terminating Call (MTC) (3) UE RNC MSC Server RANAP RAB Assignment Request RABSetupOrModifyItem RAB Parameter [DCCH] RRC Radio Bearer Setup RRC state = CELL_DCH, RAB to setup radio bearer to setup, signalling radio bearer, transport channels to add, physical channel [DCCH] RRC CELL_DCH Radio Bearer Setup Complete RANAP RAB Assignment Response successful setup [DCCH] RRC Uplink Direct Transfer CN domain = cs, NAS-PDU = CC-message: Alerting RANAP Direct Transfer LAI, SAI, NAS-PDU = Alerting [DCCH] RRC Uplink Direct Transfer CN domain = cs, NAS-PDU = CC-message: Connect RANAP Direct Transfer LAI, SAI, NAS-PDU = Connect [DCCH] RRC Downlink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Connect Ackn. CN domain = cs, NAS-PDU = CC-message: Connect Ackn. call active 19 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 2.2. Mobile Terminating Call (MTC) (4) UE RNC MSC Server [DCCH] RRC Uplink Direct Transfer CN domain = cs, NAS-PDU = CC-message: Disconnect RANAP Direct Transfer LAI, SAI, NAS-PDU = Disconnect [DCCH] RRC [DCCH] RRC Downlink Direct Transfer Uplink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Release CN domain = cs, NAS-PDU = CC-message: Release CN domain = cs, NAS-PDU = CC-message: Release Complete RANAP Direct Transfer LAI, SAI, NAS-PDU = Release Complete [DCCH] RRC cause = normal event RRC Connection Release RRC Connection Release Complete RANAP Iu Release Command cause = normal event RANAP Iu Release Complete released RAB [DCCH] RRC UTRA_Idle 20 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3. PS Mobility Management 21 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3. PS Mobility Management 3.1. PS (GPRS) Attach • UE is UTRA idle; • UE is PS detached; • no CS services running 22 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.1. PS (GPRS) Attach (1) UE RNC UTRA_Idle GPRS activation (User) SGSN [CCCH] RRC [CCCH] RRC RRC Connection Request RRC Connection Setup Initial UE ID = IMSI|TMSI+LAI, Est.Cause = registration U-RNTI, C-RNTI, signalling radio bearer RB1..RB4, TrCH configuration, PhCH configuration, radio access capability update requirement [DCCH] RRC CELL_DCH|CELL_FACH RRC Connection Setup Complete UE radio access capabilities [DCCH] RRC Initial Direct Transfer CN domain = ps, NAS-PDU = GMM-message: Attach Request RANAP Initial UE Message CN domain = ps, RAI, SAI, RNC-ID, NAS-PDU = Attach Request 23 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.1. PS (GPRS) Attach (2) UE RNC [DCCH] RRC Downlink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Authentication And Ciphering Request SGSN CN domain = ps, NAS-PDU = GMM-message: Authentication And Ciphering Request [DCCH] RRC Uplink Direct Transfer CN domain = ps, NAS-PDU = GMM-message: Authentication And Ciphering Response RANAP Direct Transfer RAI, SAI, NAS-PDU = Authentication And Ciphering Response [DCCH] RRC [DCCH] RRC … Security Mode Command Security Mode Complete RANAP Security Mode Command permitted UIA, IK, permitted UEA, CK, … selected UIA, selected UEA, ciphering activation time, … RANAP Security Mode Command selected UIA, selected UEA [DCCH] RRC Downlink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Attach Accept CN domain = ps, NAS-PDU = GMM-message: Attach Accept 24 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.1. PS (GPRS) Attach (3) UE RNC [DCCH] RRC Uplink Direct Transfer RANAP Direct Transfer RAI, SAI, NAS-PDU = Attach Complete SGSN CN domain = ps, NAS-PDU = GMM-message: Attach Complete [DCCH] RRC cause = normal event RRC Connection Release RRC Connection Release Complete RANAP Iu Release Command cause = normal event RANAP Iu Release Complete [DCCH] RRC UTRA_Idle 25 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3. PS Mobility Management 3.2. Routing Area Update (IDLE mode update) • UE is UTRA idle; • UE is PS attached; • performs cell reselection 26 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.2. Routing Area Update (IDLE) (1) UE UTRA_Idle cell reselection New RAI ? true false RNC SGSN [CCCH] RRC [CCCH] RRC RRC Connection Request RRC Connection Setup Initial UE ID = IMSI|PTMSI+RAI|TMSI+LAI, Est.Cause = registration U-RNTI, C-RNTI, signalling radio bearer RB1..RB4, TrCH configuration, PhCH configuration, radio access capability update requirement [DCCH] RRC CELL_FACH|CELL_DCH RRC Connection Setup Complete UE radio access capabilities [DCCH] RRC Initial Direct Transfer CN domain = ps, NAS-PDU = GMM-message: Routing Area Update Request 27 June 1, 2005 CONFIDENTIAL - DRAFT RANAP Initial UE Message CN domain = ps, RAI, SAI, RNC-ID, NAS-PDU = Routing Area Update Request Alexander Seifarth 3.2. Routing Area Update (IDLE) (2) UE RNC [DCCH] RRC Downlink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Authentication And Ciphering Request SGSN CN domain = ps, NAS-PDU = GMM-message: Authentication And Ciphering Request [DCCH] RRC Uplink Direct Transfer CN domain = ps, NAS-PDU = GMM-message: Authentication And Ciphering Response RANAP Direct Transfer RAI, SAI, NAS-PDU = Authentication And Ciphering Response [DCCH] RRC [DCCH] RRC … Security Mode Command Security Mode Complete RANAP Security Mode Command permitted UIA, IK, permitted UEA, CK, … selected UIA, selected UEA, ciphering activation time, … RANAP Security Mode Command selected UIA, selected UEA [DCCH] RRC Downlink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Routing Area Update Accept CN domain = ps, NAS-PDU = GMM-message: Routing Area Update Accept 28 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.2. Routing Area Update (IDLE) (3) UE RNC [DCCH] RRC Uplink Direct Transfer RANAP Direct Transfer RAI, SAI, NAS-PDU = Routing Area Update Complete SGSN CN domain = ps, NAS-PDU = GMM-message: Routing Area Update Complete RANAP [DCCH] RRC cause = normal event RRC Connection Release RRC Connection Release Complete Iu Release Command cause = normal event RANAP Iu Release Complete [DCCH] RRC UTRA_Idle 29 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3. PS Mobility Management 3.3. Routing Area Update (Connected mode update) • UE is UTRA connected for CS services; • UE is PS attached without Iu signalling connection, (PMM_IDLE); • UE performs cell reselection 30 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.3. Routing Area Update (Connected) (1) UE UTRA_Connected CELL_FACH|CELL_DCH RNC SGSN [DCCH] RRC …, new RAI, … UTRAN Mobility Information UTRAN Mobility Information Confirm Initial Direct Transfer [DCCH] RRC … [DCCH] RRC CN domain = ps, NAS-PDU = GMM-message: Routing Area Update Request RANAP Initial UE Message CN domain = ps, RAI, SAI, RNC-ID, NAS-PDU = Routing Area Update Request [DCCH] RRC Downlink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Authentication And Ciphering Request CN domain = ps, NAS-PDU = GMM-message: Authentication And Ciphering Request [DCCH] RRC Uplink Direct Transfer CN domain = ps, NAS-PDU = GMM-message: Authentication And Ciphering Response 31 June 1, 2005 CONFIDENTIAL - DRAFT RANAP Direct Transfer RAI, SAI, NAS-PDU = Authentication And Ciphering Response Alexander Seifarth 3.3. Routing Area Update (Connected) (2) UE RNC [DCCH] RRC Security Mode Command SGSN RANAP Security Mode Command permitted UIA, IK, permitted UEA, CK, … selected UIA, selected UEA, ciphering activation time, … [DCCH] RRC … Security Mode Complete RANAP Security Mode Command selected UIA, selected UEA [DCCH] RRC Downlink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Routing Area Update Accept CN domain = ps, NAS-PDU = GMM-message: Routing Area Update Accept [DCCH] RRC Uplink Direct Transfer CN domain = ps, NAS-PDU = GMM-message: Routing Area Update Complete UTRA_Connected RANAP Direct Transfer RAI, SAI, NAS-PDU = Routing Area Update Complete 32 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3. PS Mobility Management 3.4. PS (GPRS) Detach (no UE power off) • UE is UTRA Idle • UE is PMM_Idle • GPRS is to be deactivated by user 33 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.4. PS (GPRS) Detach (no UE power off) (1) UE RNC UTRA_Idle GPRS deactivation (User) SGSN [CCCH] RRC [CCCH] RRC RRC Connection Request RRC Connection Setup Initial UE ID = IMSI|TMSI+LAI, Est.Cause = detach U-RNTI, C-RNTI, signalling radio bearer RB1..RB4, TrCH configuration, PhCH configuration, radio access capability update requirement [DCCH] RRC CELL_DCH|CELL_FACH RRC Connection Setup Complete UE radio access capabilities [DCCH] RRC Initial Direct Transfer CN domain = ps, NAS-PDU = GMM-message: Detach Request RANAP Initial UE Message CN domain = ps, RAI, SAI, RNC-ID, NAS-PDU = Detach Request 34 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.4. PS (GPRS) Detach (no UE power off) (2) UE RNC [DCCH] RRC Downlink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Authentication And Ciphering Request SGSN CN domain = ps, NAS-PDU = GMM-message: Authentication And Ciphering Request [DCCH] RRC Uplink Direct Transfer CN domain = ps, NAS-PDU = GMM-message: Authentication And Ciphering Response RANAP Direct Transfer RAI, SAI, NAS-PDU = Authentication And Ciphering Response [DCCH] RRC [DCCH] RRC … Security Mode Command Security Mode Complete RANAP Security Mode Command permitted UIA, IK, permitted UEA, CK, … selected UIA, selected UEA, ciphering activation time, … RANAP Security Mode Command selected UIA, selected UEA [DCCH] RRC Downlink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Detach Accept CN domain = ps, NAS-PDU = GMM-message: Detach Accept 35 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 3.4. PS (GPRS) Detach (no UE power off) (3) UE RNC [DCCH] RRC cause = normal event SGSN RANAP Iu Release Command cause = normal event RRC Connection Release RRC Connection Release Complete RANAP Iu Release Complete [DCCH] RRC UTRA_Idle 36 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4. PDP Context Management 37 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4. PDP Context Management 4.1. PDP Context Activation • UE is UTRA idle, • UE is PMM_Idle (already registered for GPRS) • user or application activate PDP context 38 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4.1. PDP Context Activation (1) UE RNC UTRA_Idle PDP Context request (User) SGSN [CCCH] RRC [CCCH] RRC RRC Connection Request RRC Connection Setup Initial UE ID = IMSI|TMSI+LAI, Est.Cause = originating <xxx> call U-RNTI, C-RNTI, signalling radio bearer RB1..RB4, TrCH configuration, PhCH configuration, radio access capability update requirement [DCCH] RRC CELL_DCH|CELL_FACH RRC Connection Setup Complete UE radio access capabilities [DCCH] RRC Initial Direct Transfer CN domain = ps, NAS-PDU = GMM-message: Service Request (service type = signalling) RANAP Initial UE Message CN domain = ps, RAI, SAI, RNC-ID, NAS-PDU = Service Request 39 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4.1. PDP Context Activation (2) UE RNC [DCCH] RRC Downlink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Authentication And Ciphering Request SGSN CN domain = ps, NAS-PDU = GMM-message: Authentication And Ciphering Request [DCCH] RRC Uplink Direct Transfer CN domain = ps, NAS-PDU = GMM-message: Authentication And Ciphering Response RANAP Direct Transfer RAI, SAI, NAS-PDU = Authentication And Ciphering Response [DCCH] RRC [DCCH] RRC … Security Mode Command Security Mode Complete RANAP Security Mode Command permitted UIA, IK, permitted UEA, CK, … selected UIA, selected UEA, ciphering activation time, … RANAP Security Mode Command selected UIA, selected UEA [DCCH] RRC Uplink Direct Transfer CN domain = ps, NAS-PDU = SM-message: Activate PDP Context Request RANAP Direct Transfer RAI, SAI, NAS-PDU = Activate PDP Context Request 40 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4.1. PDP Context Activation (3) UE RNC SGSN [DCCH] RRC Radio Bearer Setup RANAP RAB Assignment Request RABSetupOrModifyItem RAB Parameter RRC state = CELL_DCH/FACH, RAB to setup radio bearer to setup, signalling radio bearer, transport channels to add, physical channel [DCCH] RRC CELL_DCH|CELL_FACH Radio Bearer Setup Complete RANAP RAB Assignment Response successful setup [DCCH] RRC Downlink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Activate PDP Context Accept CN domain = ps, NAS-PDU = SM-message: Activate PDP Context Accept Packet PDU Transmission 41 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4. PDP Context Management 4.2. Service Data for uplink traffic • UE is UTRA idle and PMM_Idle, • PDP context is active • uplink packet data shall be sent 42 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4.2. Service Data for uplink traffic (1) UE RNC UTRA_Idle uplink PDP PDU SGSN [CCCH] RRC [CCCH] RRC RRC Connection Request RRC Connection Setup Initial UE ID = IMSI|TMSI+LAI, Est.Cause = high priority signalling U-RNTI, C-RNTI, signalling radio bearer RB1..RB4, TrCH configuration, PhCH configuration, radio access capability update requirement [DCCH] RRC CELL_DCH|CELL_FACH RRC Connection Setup Complete UE radio access capabilities [DCCH] RRC Initial Direct Transfer CN domain = ps, NAS-PDU = GMM-message: Service Request (service type = data) RANAP Initial UE Message CN domain = ps, RAI, SAI, RNC-ID, NAS-PDU = Service Request 43 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4.2. Service Data for uplink traffic (2) UE RNC [DCCH] RRC [DCCH] RRC … SGSN RANAP Security Mode Command permitted UIA, IK, permitted UEA, CK, … Security Mode Command Security Mode Complete selected UIA, selected UEA, ciphering activation time, … RANAP Security Mode Command selected UIA, selected UEA [DCCH] RRC Radio Bearer Setup RANAP RAB Assignment Request RABSetupOrModifyItem RAB Parameter RRC state = CELL_DCH/FACH, RAB to setup radio bearer to setup, signalling radio bearer, transport channels to add, physical channel [DCCH] RRC CELL_DCH|CELL_FACH Radio Bearer Setup Complete RANAP RAB Assignment Response successful setup Packet PDU Transmission 44 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4. PDP Context Management 4.3. Service Data for downlink traffic • UE is UTRA idle and PMM_Idle, • PDP context is active • downlink packet data shall be sent 45 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4.3. Service Data for downlink traffic (1) UE RNC UTRA_Idle SGSN RANAP Paging [PCCH] RRC [CCCH] RRC [CCCH] RRC Paging Type 1 RRC Connection Request RRC Connection Setup CN domain = ps, RAI, IMSI, PTMSI, cause UE-ID = TMSI|IMSI, cause = terminating cause unknown Initial UE ID = IMSI|TMSI+LAI, Est.Cause = terminating cause unkn. U-RNTI, C-RNTI, signalling radio bearer RB1..RB4, TrCH configuration, PhCH configuration, radio access capability update requirement [DCCH] RRC CELL_DCH|CELL_FACH RRC Connection Setup Complete UE radio access capabilities [DCCH] RRC Initial Direct Transfer CN domain = ps, NAS-PDU = GMM-message: Service Request (service type = paging response) RANAP Initial UE Message CN domain = ps, RAI, SAI, RNC-ID, NAS-PDU = Service Request 46 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4.3. Service Data for downlink traffic (2) UE RNC [DCCH] RRC [DCCH] RRC … SGSN RANAP Security Mode Command permitted UIA, IK, permitted UEA, CK, … Security Mode Command Security Mode Complete selected UIA, selected UEA, ciphering activation time, … RANAP Security Mode Command selected UIA, selected UEA [DCCH] RRC Radio Bearer Setup RANAP RAB Assignment Request RABSetupOrModifyItem RAB Parameter RRC state = CELL_DCH/FACH, RAB to setup radio bearer to setup, signalling radio bearer, transport channels to add, physical channel [DCCH] RRC CELL_DCH|CELL_FACH Radio Bearer Setup Complete RANAP RAB Assignment Response successful setup Packet PDU Transmission 47 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4. PDP Context Management 4.4. PDP Context Deactivation by UE • UE is UTRA connected and PMM_Connected, • PDP context is active and will be deactivated, • ohter PS services are still active 48 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 4.4. PDP Context Deactivation (1) UE RNC UTRA_Connected PMM_Connected SGSN [DCCH] RRC Uplink Direct Transfer CN domain = ps, NAS-PDU = SM-message: Deactivate PDP Context Request RANAP Direct Transfer RAI, SAI, NAS-PDU = Deact. PDP Context Request [DCCH] RRC Radio Bearer Release RANAP RAB Assignment Request RABReleaseItem RAB ID RRC state = XXX, RAB to reconfigure, RB to release, TrCH to reconf. [DCCH] RRC Radio Bearer Release Complete RANAP RAB Assignment Response RAB data volume [DCCH] RRC Downlink Direct Transfer RANAP Direct Transfer SAPI=0, NAS-PDU = Deact.PDP Context Accept CN domain = ps, NAS-PDU = SM-message: Deactivate PDP Context Accept UTRA_XXX 49 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5. Radio Management Procedures 50 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5. Radio Management Procedures 5.1. Soft Handover • UE is UTRA connected in state CELL_DCH, • soft handover including cell 1, cell 2, cell 3 51 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5.1. Soft Handover (1 – add radio link) UE Active Set CELL_DCH cell 1 RNC [DCCH] RRC Measurement Control events 1A, 1B, 1C intra-frequency cell list for cell 1, reporting criteria [DCCH] RRC [DCCH] RRC cell addition info Measurement Report Active Set Update downlink code information for cell 2 trigger event = 1A for cell 2, measured results [DCCH] RRC Active Set CELL_DCH cell 1, cell 2 Active Set Update Complete [DCCH] RRC Measurement Control events 1A, 1B, 1C intra-frequency cell list for cell 1/2, reporting criteria 52 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5.1. Soft Handover (2 – replacement) UE RNC [DCCH] RRC Measurement Report trigger event = 1C for cell 3/1, measured results [DCCH] RRC cell addition info cell removal info Active Set Update downlink code information for cell 3 radio link id cell 1 [DCCH] RRC Active Set CELL_DCH cell 3, cell 2 Active Set Update Complete [DCCH] RRC Measurement Control intra-frequency cell list for cell 3/2, removal of cell 1’s neighbour cell list, reporting criteria events 1A, 1B, 1C 53 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5.1. Soft Handover (3 – radio link deletion) UE RNC [DCCH] RRC Measurement Report trigger event = 1B for cell 2, measured results [DCCH] RRC cell removal info Active Set Update radio link id cell 2 [DCCH] RRC Active Set CELL_DCH cell 3 Active Set Update Complete [DCCH] RRC Measurement Control events 1A, 1B, 1C removal of cell 2’s neighbour cell list, reporting criteria 54 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5. Radio Management Procedures 5.2. Packet Radio Bearer Management • UE is UTRA connected and PMM_Connected, • PDP context is active and RAB exists for it 55 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5.2. Packet Radio Bearer Management (1) UE RNC CELL_DCH|CELL_FACH SGSN Packet PDU Transmission RB Inactivity Timer [DCCH] RRC [DCCH] RRC CELL_PCH|URA_PCH Radio Bearer Release Radio Bearer Release Complete RRC state = CELL_PCH/URA_PCH, radio bearer identitiy to release Expiry of all Inactivity Timers uplink PDP PDU [CCCH] RRC [CCCH] RRC Cell Update Cell Update Confirm U-RNTI, cause = uplink data transmission U-RNTI, RRC state = CELL_DCH/FACG, radio bearer to set up 56 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5.2. Packet Radio Bearer Management (2) UE RNC [DCCH] RRC CELL_DCH|CELL_FACH SGSN Radio Bearer Setup Complete Packet PDU Transmission RB Inactivity Timer [DCCH] RRC [DCCH] RRC CELL_PCH|URA_PCH Radio Bearer Release Radio Bearer Release Complete RRC state = CELL_PCH/URA_PCH, radio bearer identitiy to release Expiry of all Inactivity Timers 57 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth 5.2. Packet Radio Bearer Management (3) UE RNC [PCCH] RRC U-RNTI SGSN Paging Type 1 Cell Update Cell Update Confirm Radio Bearer Setup Complete Packet PDU Transmission [CCCH] RRC [CCCH] RRC [DCCH] RRC CELL_DCH|CELL_FACH U-RNTI, cause = paging response U-RNTI, RRC state = CELL_DCH/FACG, radio bearer to set up Packet PDU Transmission Packet PDU Transmission RB Inactivity Timer 58 June 1, 2005 CONFIDENTIAL - DRAFT Alexander Seifarth
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