Content for TS 26.517 Word version: 18.1.0

3.1 Terms 3.2 Symbols 3.3 Abbreviations 3.4 Syntax documentation conventions
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1 Scope p. 8

The present document defines protocols and formats for User Services as defined in TS 26.502 and conveyed using the 5G multicast-broadcast capabilities of the 5G System defined in TS 23.501, TS 23.502 and TS 23.247.

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]

TR 21.905: "Vocabulary for 3GPP Specifications".

[2]

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

[3]

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

[4]

TS 23.503: "Policy and charging control framework for the 5G System (5GS); Stage 2".

[5]

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

[6]

TS 26.502: "5G multicast-broadcast services; User Service architecture".

[7]

TS 26.346: "MBMS; Protocols and Codecs".

[8]

RFC 8866: "Session Description Protocol".

[9] Void.

[10]

TS 23.003: "Numbering, addressing and identification".

[11]

TS 24.008: "Mobile radio interface Layer 3 specification; Core network protocols; Stage 3".

[12]

RFC 3926: "FLUTE - File Delivery over Unidirectional Transport".

[13] Void.

[14]

OpenAPI: "OpenAPI 3.0.0 Specification", https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.0.md.

[15]

TS 29.500: "5G System; Technical Realization of Service Based Architecture; Stage 3".

[16]

TS 29.501: "5G System: Principles and Guidelines for Services Definition; Stage 3".

[17]

TS 29.580: "5G System; Multicast/Broadcast Service Function services; Stage 3".

[18]

TS 29.581: "5G System; Multicast/Broadcast Service transport services; Stage 3".

[19]

RFC 9110: "HTTP Semantics", June 2022.

[20]

RFC 9111: "HTTP Caching", June 2022.

[21]

RFC 9112: "HTTP/1.1", June 2022.

[22]

RFC 9113: "HTTP/2", June 2022.

[23] Reserved for future use.

[24]

RFC 8446: "The Transport Layer Security (TLS) Protocol Version 1.3", August 2018.

[25]

Open Mobile Alliance: "OMNA BCAST Service Class Registry", https://technical.openmobilealliance.org/OMNA/bcast/bcast-service-class-registry.html.

[26]

RFC 3629: "UTF-8, a transformation format of ISO 10646".

[27]

RFC 8141: "Uniform Resource Names (URNs)".

[28]

ISO 639-2: "Codes for the representation of names of languages - Part 2: Alpha-3 code".

[29]

RFC 6381: "The 'Codecs' and 'Profiles' Parameters for "Bucket" Media Types".

[30]

TS 29.571: "5G System; Common Data Types for Service Based Interfaces; Stage 3".

[31]

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

[32]

TS 33.501: "Security architecture and procedures for 5G system".

[33]

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

[34]

RFC 3986: "Uniform Resource Identifier (URI): Generic Syntax".

[35]

TR 26.946: "Multimedia Broadcast/Multicast Service (MBMS) user service guidelines".

[36]

TS 26.247: "Transparent end-to-end Packet-switched Streaming Service (PSS); Progressive Download and Dynamic Adaptive Streaming over HTTP (3GP-DASH)".

[37]

RFC 2046, "Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types".

[38]

RFC 2387: "The MIME Multipart/Related Content-type".

[39]

RFC 2557: "MIME Encapsulation of Aggregate Documents, such as HTML (MHTML)".

[40]

RFC 2017: "Definition of the URL MIME External-Body Access-Type".

[41]

RFC 1952: "GZIP file format specification version 4.3".

[42]

TS 38.331: "NR; Radio Resource Control (RRC) protocol specification".

3 Definitions of terms, symbols and abbreviations p. 9

3.1 Terms p. 9

For the purposes of the present document, the terms given in TR 21.905, TS 23.501, TS 23.502, TS 23.247, TS 26.502 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.

User Service Descriptions document:

a version-controlled document that conveys one or more User Service Description objects.

User Service Description object:

a JSON object carrying information about a single MBS User Service corresponding to an MBS User Service Announcement.

3.2 Symbols p. 9

Void.

3.3 Abbreviations p. 10

For the purposes of the present document, the abbreviations given in TR 21.905, TS 23.501, TS 23.502, TS 23.247 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.

ALC

Asynchronous Layered Coding

CMAF

Common Media Application Format

DASH

Dynamic Adaptive Streaming over HTTP

ESI

Encoding Symbol Identifier

FDT

File Delivery Table

FLUTE

File Delivery over Unidirectional Transport

FSA

Frequency Selection Area

GBA

Generic Bootstrapping Architecture

HTTP

HyperText Transfer Protocol

HTTPS

HTTP over TLS

JSON

JavaScript Object Notation

MBMS

Multimedia Broadcast Multicast Service

MBS

Multicast-Broadcast Services

MB-SMF

Multicast-Broadcast Session Management Function

MB-UPF

Multicast-Broadcast User Plane Function

MBSF

Multicast-Broadcast Service Function

MBSTF

Multicast-Broadcast Service Transport Function

MPD

Media Presentation Description

MSK

MBS Service Key

PCF

Policy and Charging Function

NEF

Network Exposure Function

OTI

Object Transmission Information

ROHC

Robust Header Compression

RTP

Real-Time Protocol

SDP

Session Description Protocol

TMGI

Temporary Mobile Group Identity

TOI

Transmission Object Identifier

UDP

User Datagram Protocol

User Equipment

UML

Unified Markup Language

XML

eXtensible Markup Language

YAML

Yet Another Markup Language

3.4 Syntax documentation conventions p. 10

The conventions from TS 29.501 apply to this document with the following extensions for OpenAPI [14] structured data type definitions as defined in clause 5.2.4.1 of TS 29.501:

Data types are annotated in Bold face.
Properties of data types are noted in codestyle.

4 System overview p. 10

The present document defines protocols and formats for MBS User Services as defined in TS 26.502 and conveyed using the 5G Multicast-Broadcast capabilities of the 5G System defined in TS 23.501, TS 23.502 and TS 23.247.

MBS User Services enable high-level applications to make use of the low-level features of the MBS System. An MBS User Service is provided by the MBSF and MBSTF working in combination to support configuration option 2 and configuration option 3 defined in annex A of TS 23.247. The MBS User Services architecture is defined in clause 4.2.2 of TS 26.502 and shows the MBS-related entities involved in providing MBS User Services delivery and control.

The MBSF and MBSTF offer service layer functionality for sending MBS data via MBS Sessions. The MBSF offers control plane functionality while the MBSTF offers user plane functionality. The MBSTF acts as a User Plane anchor when it sources IP multicast traffic. Clause 4.3.1 of TS 26.502 defines the set of functional entities involved in supporting MBS User Services, including client functions in the UE.