ETSI TS 125 346 V7.6.0 (2008-01) Technical Specification Universal Mobile Telecommunications System (UMTS); Introduction of the Multimedia Broadcast/Multicast Service (MBMS) in the Radio Access Network (RAN); Stage 2 (3GPP TS 25.346 version 7.6.0 Release 7) 3GPP TS 25.346 version 7.6.0 Release 7 1 ETSI TS 125 346 V7.6.0 (2008-01) Reference RTS/TSGR-0225346v760 Keywords UMTS ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88 Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). 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ETSI 3GPP TS 25.346 version 7.6.0 Release 7 3 ETSI TS 125 346 V7.6.0 (2008-01) Contents Intellectual Property Rights................................................................................................................................2 Foreword.............................................................................................................................................................2 Foreword.............................................................................................................................................................6 1 Scope........................................................................................................................................................7 2 References................................................................................................................................................7 3 Definitions, symbols and abbreviations...................................................................................................7 3.1 Definitions..........................................................................................................................................................7 3.2 Symbols..............................................................................................................................................................9 3.3 Abbreviations.....................................................................................................................................................9 4 Background and introduction...................................................................................................................9 5 MBMS UTRAN and protocol architecture............................................................................................10 5.1 MBMS UTRAN architecture principles...........................................................................................................10 5.1.1 MBMS Service Context in CRNC..............................................................................................................10 5.1.2 MBMS Session start and MBMS Session Stop..........................................................................................10 5.1.3 MBMS Iu bearer.........................................................................................................................................11 5.1.4 MBMS Iub bearer.......................................................................................................................................11 5.1.5 Mapping of MBMS Iu bearer to p-t-p and p-t-m connections....................................................................11 5.1.6 UE Linking/De-linking...............................................................................................................................12 5.1.7 RNC Registration........................................................................................................................................13 5.1.8 RNC De-Registration..................................................................................................................................14 5.1.9 CN De-Registration....................................................................................................................................14 5.1.10 URA Linking/De-linking............................................................................................................................14 5.2 MBMS Uu Principles.......................................................................................................................................15 5.2.1 MBMS Service States in UE.......................................................................................................................15 5.2.2 One PDCP and RLC entity shared among multiple cells within one RNS.................................................15 5.2.3 MCCH Information Scheduling..................................................................................................................15 5.2.4 MBMS Notification....................................................................................................................................16 5.2.5 MBMS Counting........................................................................................................................................17 5.2.6 MBMS Radio Bearer Release in the UE.....................................................................................................18 5.2.7 MBMS Session Repetition..........................................................................................................................19 5.2.8 MBMS Service Prioritisation......................................................................................................................19 5.3 Protocol structure.............................................................................................................................................20 5.3.1 MBMS User Plane Protocol Stack Architecture.........................................................................................20 5.3.2 MBMS Control Plane Protocol Stack Architecture....................................................................................21 5.4 MAC architecture.............................................................................................................................................21 5.4.1 UTRAN MAC Architecture to support MBMS..........................................................................................21 5.4.2 MAC-c/sh/m architecture: UTRAN side....................................................................................................22 5.4.3 MAC-c/sh/m architecture: UE side.............................................................................................................22 6 MBMS Channel Structure......................................................................................................................23 6.1 Point-to-Point Transmission.............................................................................................................................23 6.2 Point-to-multipoint Transmission.....................................................................................................................23 6.2.1 Logical Channels........................................................................................................................................23 6.2.1.1 MBMS point-to-multipoint Control Channel (MCCH).........................................................................23 6.2.1.2 MBMS point-to-multipoint Traffic Channel (MTCH)..........................................................................24 6.2.1.3 MBMS point-to-multipoint Scheduling Channel (MSCH)...................................................................24 6.2.2 Transport Channel......................................................................................................................................24 6.2.3 Physical Channel........................................................................................................................................24 6.2.4 Mapping between channels.........................................................................................................................24 6.2.5 Data Flows through Layer 2.......................................................................................................................25 6.2.5.1 Data flow for MCCH mapped to FACH...............................................................................................25 6.2.5.2 Data flow for MTCH mapped to FACH...............................................................................................25 6.2.5.3 Data flow for MSCH mapped to FACH................................................................................................25 ETSI 3GPP TS 25.346 version 7.6.0 Release 7 4 ETSI TS 125 346 V7.6.0 (2008-01) 6.3. MBMS Notification Indicator Channel............................................................................................................25 7 MBMS Reception and UE Capability....................................................................................................25 7.1 Selective and Soft Combining for MBMS P-T-M transmission.......................................................................25 7.1.bis Simulcast Combining (TDD only)..............................................................................................................26 7.1.ter Chip Combining (1.28Mcps TDD).............................................................................................................27 7.1A MBMS over a Single Frequency Network (MBSFN)......................................................................................28 7.1A.1 3.84 / 7.68 MCPS TDD MBMS over a Single Frequency Network (MBSFN)..........................................29 7.1A.2 FDD MBMS over a Single Frequency Network (MBSFN)........................................................................30 7.1A.3 1.28 MCPS TDD MBMS over a Single Frequency Network (MBSFN)....................................................30 7.2 UE Capability...................................................................................................................................................31 7.3 MBMS Reception.............................................................................................................................................32 7.3.1 MBMS Reception in RRC Idle Mode.........................................................................................................32 7.3.2 MBMS Reception in RRC Connected Mode: URA_PCH state.................................................................32 7.3.3 MBMS Reception in RRC Connected Mode: CELL_PCH state................................................................33 7.3.4 MBMS Reception in RRC Connected Mode: CELL_FACH state.............................................................33 7.3.5 MBMS Reception in RRC Connected Mode: CELL_DCH state...............................................................33 8 UTRAN Signalling Flows for MBMS...................................................................................................34 8.1 MBMS High Level Signalling Scenarios.........................................................................................................34 8.1.1 Session start................................................................................................................................................34 8.1.2 Joining (during a session)...........................................................................................................................36 8.1.3 Recounting..................................................................................................................................................37 8.1.4 Session stop................................................................................................................................................39 8.2 MBMS RNC Signalling Flows.........................................................................................................................39 8.2.1 MBMS Session Start procedure..................................................................................................................39 8.2.2 MBMS Session Update procedure..............................................................................................................40 8.2.3 MBMS Session Stop procedure..................................................................................................................40 8.2.4 RNC Registration procedure.......................................................................................................................41 8.2.5 RNC De-Registration procedure.................................................................................................................41 8.2.6 CN De-Registration procedure...................................................................................................................41 8.2.7 MBMS Channel Type Switching over Uu..................................................................................................42 8.2.8 MBMS UE Linking....................................................................................................................................42 8.2.9 MBMS UE De-Linking..............................................................................................................................43 8.2.10 MBMS Service Id Request.........................................................................................................................43 8.2.11 MBMS Attach/Detach over Iur...................................................................................................................44 8.2.12 MBMS Channel Type Reconfiguration over Iur........................................................................................44 8.2.13 Information Exchange over Iur...................................................................................................................45 8.2.14 MBMS RAB Establishment Indication.......................................................................................................45 8.2.15 MBMS RAB Release..................................................................................................................................46 8.3 MBMS Uu Signalling Flows............................................................................................................................47 8.3.1 Broadcast of MBMS System Information..................................................................................................47 8.3.2 MBMS Service Information.......................................................................................................................47 8.3.3 MBMS Radio Bearer Information..............................................................................................................48 8.3.4 MBMS Access Information........................................................................................................................48 8.3.5 MBMS Neighbouring Cell Information......................................................................................................49 8.3.6 MBMS Joined Indication............................................................................................................................49 8.3.7 MTCH Scheduling Information..................................................................................................................50 8.3.8 MBMS Change Information.......................................................................................................................50 8.3.9 MBMS P-T-P Modification Request..........................................................................................................51 8.3.10 MBMS Counting Response........................................................................................................................51 8.3.11 MBMS Selected Services Information.......................................................................................................52 9 Security for MBMS................................................................................................................................52 10 Mobility Procedures for MBMS.............................................................................................................52 10.1 Use of Periodical Transmission of MBMS Critical Information......................................................................52 10.2 UE Actions for Mobility...................................................................................................................................53 10.2.1 RRC idle mode...........................................................................................................................................53 10.2.2 URA_PCH State.........................................................................................................................................54 10.2.3 CELL_PCH.................................................................................................................................................54 10.2.4 CELL_FACH..............................................................................................................................................54 10.2.5 CELL_DCH State.......................................................................................................................................55 ETSI 3GPP TS 25.346 version 7.6.0 Release 7 5 ETSI TS 125 346 V7.6.0 (2008-01) 11 Resource Management for MBMS.........................................................................................................55 11.1 MBMS Access Control Procedure...................................................................................................................55 11.2 Frequency layer Convergence..........................................................................................................................57 11.3 Frequency layer Dispersion..............................................................................................................................57 Annex A (informative): MBMS Phases in UTRAN.............................................................................58 A1 Security for MBMS................................................................................................................................58 A2 MBMS Phase 2.......................................................................................................................................58 A3 MBMS Phase 3.......................................................................................................................................59 A4 MBMS Phases and Status Parameters....................................................................................................59 Annex B (informative): MBMS Control Information.........................................................................60 Annex C (informative): Change history...............................................................................................62 History..............................................................................................................................................................65 ETSI 3GPP TS 25.346 version 7.6.0 Release 7 6 ETSI TS 125 346 V7.6.0 (2008-01) Foreword This Technical Report has been produced by the 3rd Generation Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI 3GPP TS 25.346 version 7.6.0 Release 7 7 ETSI TS 125 346 V7.6.0 (2008-01) 1 Scope The present document is a technical specification of the overall support of Multimedia Broadcast Multicast Service in UTRA. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. • For a specific reference, subsequent revisions do not apply. • For a non-specific reference, the latest version applies. [1] 3GPP TR 21.905: " Vocabulary for 3GPP Specifications ". [2] 3GPP TS 22.146: "Multimedia Broadcast/Multicast Service; Stage 1". [3] 3GPP TS 22.246: "MBMS User Services; Stage 1". [4] 3GPP TS 23.246: "Multimedia Broadcast Multicast Service; Architecture and Functional Description". [5] 3GPP TR 25.992: "Multimedia Broadcast Multicast Service (MBMS); UTRAN/GERAN Requirements". [6] 3GPP TS 23.236: "Intra-domain connection of Radio Access Network (RAN) nodes to multiple Core Network (CN) nodes". [7] 3GPP TS 33.246: "3G Security; Security of Multimedia Broadcast/Multicast Service (MBMS)". [8] 3GPP TS 25.301: "Radio Interface Protocol Architecture". [9] 3GPP TS 25.211: "Physical channels and mapping of transport channels onto physical channels (FDD)". [10] 3GPP TS 25.221: "Physical channels and mapping of transport channels onto physical channels (TDD) ". [11] 3GPP TS 25.304: "User Equipment (UE) procedures in idle mode and procedures for cell reselection in connected mode". [12] 3GPP TS 25.306: "UE Radio Access capabilities". [13] 3GPP TS 25.331: "Radio Resource Control (RRC); Protocol Specification". 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply. ETSI 3GPP TS 25.346 version 7.6.0 Release 7 8 ETSI TS 125 346 V7.6.0 (2008-01) Idle period Data Data Data Service 1 of seconds transfer transfer transfer events Start Service 1 1st session 1st session Stop Service 1 announcement start stop announcement Service 1 session 1 Service 1 Session 2 Service 1 availability Figure 3.1: MBMS Timeline, based on [4]. MBMS session start is the point at which the BM-SC is ready to send data. MBMS notification informs the UEs about forthcoming and about ongoing MBMS data transfer. MBMS Cell Group is a group of multiple cells belonging to one RNS and sharing one PDCP and RLC entity to utilize p-t-m transmission of the MBMS Service MBMS session stop is the point at which the BM-SC determines that there will be no more data to send for some period of time. Data transfer is the phase when MBMS data are transferred to the UEs. MBMS service availability is the phase between start of service announcement and the end of the last session or stop of service announcement. MBMS Iu data bearer denotes the data bearer established between SGSN and RNC to transport MBMS data MBMS radio bearer denotes the data bearer established between RNC and UE(s) to transport MBMS data MBMS RAB denotes both, the MBMS Iu data bearer and the MBMS radio bearer MBMS Service Context contains the necessary information for the UTRAN to control the MBMS Service in UTRAN. MBMS Activated Services: a set of services made up of those in MBMS multicast mode that the UE has joined as well as those in MBMS broadcast mode that the UE is interested in receiving. MBMS Selected Services: a subset of the MBMS activated services in MBMS Broadcast mode for which the UE applies RRC procedures to inform UTRAN that the service has been selected (by upper layers). MBMS Iu signalling connection denotes the signalling connection established between the RNC and the CN node to serve one MBMS Service Context. MBMS Service Announcement: Mechanism to allow users to be informed about the MBMS services available [4] Pool area: see definition in ref.[6] MBMS Multicast Service Activation: see description in ref.[4] Critical Information: MBMS Neighbouring Cell Information, MBMS Radio Bearer Information and MBMS Service Information sent on MCCH. Non-critical information: MBMS Access Information sent on MCCH. MBMS Service Area: The area in which a specific MBMS session is made available. Each transmission and retransmission of an MBMS session of an MBMS Bearer Service may be made available to a different MBMS Service Area. The MBMS Service Area is described by a list of MBMS Service Area IDs, where each MBMS Service Area ID represents a group of cells. The definition of an MBMS Service Area ID is independent of an MBMS session, and of an MBMS Bearer Service. [4] L1-combining schedule: Indicates when the soft combining is applicable between the specific S-CCPCH of the cell and the specific S-CCPCH of the neighbouring cell. ETSI 3GPP TS 25.346 version 7.6.0 Release 7 9 ETSI TS 125 346 V7.6.0 (2008-01) MBMS Single Frequency Network: A simulcast transmission technique realised by transmission of identical waveforms at the same time via a group of cells covering a geographic area. MBSFN mode: In order to achieve higher spectral efficiency synchronized cells operate in MBSFN mode which implies that they transmit exactly the same content over an area that is seen as one MBSFN cell by the UE. MBSFN cluster: Set of cells operating in MBSFN mode providing only MBMS service in PtM mode and seen as one cell by a UE. MBMS service transmission schedule: Indicates when the specific MBMS service is expected to be transmitted in the cell in specific S-CCPCH. The information is transmitted on MSCH S-CCPCH: In case of TDD, the S-CCPCH refers to the CCTrCH carrying FACH UE Link denotes the stored information in the RNC on MBMS services joined by the UE in the state other than URA_PCH in the course of the UE Linking procedure. URA Link denotes the stored information in the RNC on MBMS services joined by a UE in URA_PCH state in the course of the URA Linking procedure. 3.2 Symbols (void) 3.3 Abbreviations For the purposes of the present document, the abbreviations given in 3GPP TS 21.905 [1] and the following apply: CELL_DCH CELL_FACH FFS For Further Study FLC Frequency Layer Convergence LCI Layer Convergence Information MBMS Multimedia Broadcast Multicast Service MBSFN MBMS over a Single Frequency Network MBMS service ID Multimedia Broadcast Multicast Service service Identity MBMS Session ID Multimedia Broadcast Multicast Service session identity MCCH MBMS point-to-multipoint Control Channel MICH MBMS notification Indicator Channel MSCH MBMS point-to-multipoint Scheduling Channel MTCH MBMS point-to-multipoint Traffic Channel NI Notification Indicator PL Preferred Layer p-t-p Point-to-Point p-t-m Point-to-Multipoint PF Probability Factor 4 Background and introduction The Introduction of the Multimedia Broadcast Multicast Service in UTRA describes techniques for optimised transmission of MBMS bearer service in UTRA such as point-to-multipoint transmission, selective combining and transmission mode selection between point-to-multipoint and point-to-point bearer. The Stage 1 MBMS service requirements are defined in [2] and MBMS Stage 1 user services are defined in [3]. UTRAN (and GERAN) requirements are covered in TR 25.992 [5]. The overall architecture, functional description and the reference architecture of MBMS are covered in TS 23.246 [3]. ETSI