Content for TR 26.802 Word version: 17.0.0

1 Scope p. 8

This Technical Report identifies and evaluates potential enhancements to the 5G Media Streaming (5GMS) [1] in order to provide multicast-broadcast media streaming services. It has the following objectives:

Define scenarios where multicast ingestion or multicast distribution might be used, including potential IGMP termination options [2], [3], and [4]. Examples for such collaboration scenarios are transparent multicast delivery, multicast linear IPTV delivery, hybrid unicast/multicast (e.g. MooD or service continuity), and multicast Adaptive Bit Rate (ABR) for Over the Top (OTT) live streaming.
Identify the relevant key issues and gaps in 5GMS to support the above scenarios based on the existing 5GS multicast architecture.
Document architecture extensions and procedures to support the above-defined scenarios.
Identify protocols to support the above extensions and procedures in 5GMS.
Identify Procedures for managing downlink multicast streaming and session lifecycle.
Select a subset of relevant scenarios that should be supported in extensions to 5G Media Streaming.

2 References p. 8

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. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.

[1]

TS 26.501: "5G Media Streaming (5GMS); General description and architecture".

[2]

RFC 2236: "Internet Group Management Protocol, Version 2".

[3]

RFC 4604: "Using Internet Group Management Protocol Version 3 (IGMPv3) and Multicast Listener Discovery Protocol Version 2 (MLDv2) for Source-Specific Multicast".

[4]

RFC 3376: "Internet Group Management Protocol, Version 3".

[5]

TR 21.905: "Vocabulary for 3GPP Specifications".

[6]

TS 23.246: "MBMS Architecture and functional description".

[7]

TR 23.757: "Study on architecture enhancements for 5G multicast-broadcast services".

[8]

TS 23.316: "Wireless and wireline convergence access support for the 5G system".

[9]

TS 23.501: "System architecture for the 5G System (5GS)".

[10]

TS 23.502: "System architecture for the 5G System (5GS)".

[11]

TS 23.503: "System architecture for the 5G System (5GS)".

[12]

ETSI TS 103 769: "Digital Video Broadcasting (DVB); Adaptive media streaming over IP multicast", v1.1.1, November 2020.

[13]

CableLabs OC-TR-IP-MULTI-ARCH-C01: "IP Multicast Adaptive Bit Rate Architecture Technical Report", October 2016. Internet Available https://www.cablelabs.com/specifications/ip-multicast-adaptive-bit-rate-architecture-technical-report

[14]

ETSI TS 103 285: "Digital Video Broadcasting (DVB); MPEG-DASH Profile for Transport of ISO BMFF Based DVB Services over IP Based Networks".

[15]

TS 26.348: "Northbound Application Programming Interface (API) for Multimedia Broadcast/Multicast Service (MBMS) at the xMB reference point", Release 16.

[16]

TS 26.346: "Multimedia Broadcast/Multicast Service (MBMS); Protocols and Codecs", Release 16.

[17]

ATSC A/331: "ATSC Standard: Signaling, Delivery, Synchronization, and Error Protection".

[18]

TS 29.468: "Group Communication System Enablers for LTE (GCSE_LTE); MB2 Reference Point; Stage 3".

[19]

TS 23.468: "Group Communication System Enablers for LTE (GCSE_LTE); Stage 2".

[20]

RFC 6733: "Diameter Base Protocol", October 2012.

[21]

TS 26.347: "Multimedia Broadcast/Multicast Service (MBMS); Application Programming Interface and URL", Release 16.

[22]

TS 22.146: "Multimedia Broadcast/Multicast Service (MBMS); Stage 1", Release 16.

[23]

RFC 5053: "Raptor Forward Error Correction Scheme for Object Delivery", October 2007.

[24]

RFC 5445: "Basic Forward Error Correction (FEC) Schemes", March 2009.

[25]

RFC 3695: "Compact Forward Error Correction (FEC) Schemes", February 2004.

[26]

TS 23.247: "Architectural enhancements for 5G multicast-broadcast services; Stage 2;" Release 17.

[27]

TS 26.511: "5G Media Streaming (5GMS); Profiles, codecs and formats".

[28]

TS 26.512: "5G Media Streaming (5GMS); Protocols".

3 Definitions of terms, symbols, and abbreviations p. 9

3.1 Terms p. 9

For the present document, the terms given in TR 21.905, TS 26.501, TR 23.757 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 or TS 26.501.

5MBS User Service:

Services provided to the end user by means of 5MBS transport and possibly other capabilities.

Broadcast MBS Session:

See TS 23.247.

MBS Session:

See TS 23.247.

Multicast adaptive bit rate (MABR):

a method of media streaming in which source media segments are encapsulated into the delivery units of a multicast media transport protocol, and are delivered over a multicast-capable network to a client-side function that is capable of switching dynamically between available unicast or multicast delivery of the ABR media with differing technical characteristics (e.g. different quality and bit rate) according to prevailing packet reception conditions.

Multicast MBS Session:

See TS 23.247.

Multimedia Broadcast/Multicast Service (MBMS):

See TS 22.146.

3.2 Abbreviations p. 10

For the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.

5MBS

5G Multicast/Broadcast Service

5GMS

5G Media Streaming.

ABR

Adaptive Bit Rate.

AL-FEC

Application-Level Forward Error Correction

ATSC

Advanced Television Systems Committee

BM-SC

Broadcast-Multicast - Service Centre

CMAF

Common Media Application Format

DASH

Dynamic Adaptive Streaming over HTTP

DNS

Domain Name Service

DVB

Digital Video Broadcasting

FEC

Forward Error Correction

FLUTE

File deLivery over Unidirectional Transport

HLS

HTTP Live Streaming

HTTP

HyperText Transfer Protocol

IGMP

Internet Group Management Protocol

IPTV

Internet Protocol Television

ISO BMFF

International Standardization Organization Base Media File Format

MABR

Multicast ABR

MBMS

Multimedia Broadcast/Multicast Service

MBS

Multicast/Broadcast Service

MBSF

Multicast/Broadcast Service Function

MBSTF

Multicast/Broadcast Service Transport Function

MLD

Multicast Listener Discovery

MPEG

Moving Picture Experts Group

OTT

Over-The-Top

RoHC

Robust Header Compression

ROUTE

Real-time transport Object delivery over Unidirectional Transport

TMGI

Temporary Mobile Group Identity

XML

Extensible Markup Language