Content for TS 25.346 Word version: 18.0.0

3.1 Definitions 3.2 Symbols 3.3 Abbreviations
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1 Scope p. 7

The present document is a technical specification of the overall support of Multimedia Broadcast Multicast Service in UTRA.

2 References p. 7

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]

TR 21.905: "Vocabulary for 3GPP Specifications ".

[2]

TS 22.146: "Multimedia Broadcast/Multicast Service; Stage 1".

[3]

TS 22.246: "MBMS User Services; Stage 1".

[4]

TS 23.246: "Multimedia Broadcast Multicast Service; Architecture and Functional Description".

[5]

TR 25.992: "Multimedia Broadcast Multicast Service (MBMS); UTRAN/GERAN Requirements".

[6]

TS 23.236: "Intra-domain connection of Radio Access Network (RAN) nodes to multiple Core Network (CN) nodes".

[7]

TS 33.246: "3G Security; Security of Multimedia Broadcast/Multicast Service (MBMS)".

[8]

TS 25.301: "Radio Interface Protocol Architecture".

[9]

TS 25.211: "Physical channels and mapping of transport channels onto physical channels (FDD)".

[10]

TS 25.221: "Physical channels and mapping of transport channels onto physical channels (TDD) ".

[11]

TS 25.304: "User Equipment (UE) procedures in idle mode and procedures for cell reselection in connected mode".

[12]

TS 25.306: "UE Radio Access capabilities".

[13]

TS 25.331: "Radio Resource Control (RRC); Protocol Specification".

[14]

TS 25.446: "MBMS Synchronisation Protocol (SYNC)".

[15]

TS 23.007: "Restoration procedures".

3 Definitions, symbols and abbreviations p. 7

3.1 Definitions p. 7

For the purposes of the present document, the following terms and definitions apply.

Copy of original 3GPP image for 3GPP TS 25.346, Fig. 3.1: MBMS Timeline, based on [4].

Figure 3.1: MBMS Timeline, based on [4].
(⇒ copy of original 3GPP image)

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.

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. In case of 3.84 Mcps TDD MBSFN IMB, the S-CCPCH refers either to S-CCPCH frame type 1 or S-CCPCH frame type 2, or both S-CCPCH frame type 1 and S-CCPCH frame type 2.

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.

MBMS Master RNC:

role an RNC can take with respect to one or more specific MBSFN cluster(s). MRNC may be used for Inter-RNC MBSFN operation whenever dynamic synchronization of radio resources used for MBMS services is centrally controlled. There is only one MBMS Master RNC for any MBSFN cluster, which may control one or more MBSFN cluster(s). The MRNC has the overall control of the logical resources of the RNSs that are used for MBSFN operation within the MBSFN cluster(s).

Synchronisation Sequence:

Each SYNC PDU contains a time stamp which indicates the start time of the synchronisation sequence. Each synchronisation sequence has the same duration which is configured in the BM-SC and the RNCs operating in inter-RNC synchronisation mode.

Synchronisation Period:

The synchronisation period provides the time reference for the indication of the start time of each synchronisation sequence. The time stamp which is provided in each SYNC PDU is a relative value which refers to the start time of the synchronisation period. The duration of the synchronisation period is configurable.

3.2 Symbols p. 9

(void)

3.3 Abbreviations p. 9

For the purposes of the present document, the abbreviations given in TS 21.905 and the following apply:

CELL_DCH

CELL_FACH

FFS

For Further Study

FLC

Frequency Layer Convergence

IMB

Integrated Mobile Broadcast

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

MRNC

MBMS Mater RNC

MSCH

MBMS point-to-multipoint Scheduling Channel

MTCH

MBMS point-to-multipoint Traffic Channel

Notification Indicator

Preferred Layer

p-t-p

Point-to-Point

p-t-m

Point-to-Multipoint

Probability Factor

4 Background and introduction p. 10

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. The overall architecture, functional description and the reference architecture of MBMS are covered in TS 23.246.