Content for TS 26.113 Word version: 18.0.0

3.1 Terms 3.2 Symbols 3.3 Abbreviations
...

1 Scope p. 8

The present document specifies the set of stage-3 procedures, APIs, and protocols for the reference points defined in Real-Time Media Communication (RTC) architecture. While TS 26.510 defines the common set of APIs and interactions, this document refers to TS 26.510 for the general aspects and primarily deals with RTC-specific aspects to support WebRTC-based real-time media transport over 5G.

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 26.506: "5G Real-time Media Communication Architecture (Stage 2)".

[3]

TS 26.510: "Media delivery; interactions and APIs for provisioning and media session handling".

[4]

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

[5]

RFC 9110 (2022): "HTTP Semantics".

[6]

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

[7]

RFC 8834 (2021): "Media Transport and Use of RTP in WebRTC".

[8]

RFC 8835 (2021): "Transports for WebRTC".

[9]

TS 23.003: "Numbering, addressing and identification".

[10]

RFC 8829 (2021): "JavaScript Session Establishment Protocol (JSEP)".

[11]

RFC 7807 (2016): "Problem Details for HTTP APIs".

[12]

RFC 8825 (2021): "Overview: Real-Time Protocols for Browser-Based Applications".

[13]

RFC 5124 (2008): "Extended Secure RTP Profile for Real-time Transport Control Protocol (RTCP)-Based Feedback (RTP/SAVPF)".

[14]

RFC 7007 (2013): "Update to Remove DVI4 from the Recommended Codecs for the RTP Profile for Audio and Video Conferences with Minimal Control (RTP/AVP)".

[15]

RFC 3551 (2003): "RTP Profile for Audio and Video Conferences with Minimal Control".

[16]

RFC 4585 (2006): "Extended RTP Profile for Real-time Transport Control Protocol (RTCP)-Based Feedback (RTP/AVPF)".

[17]

RFC 3711 (2004): "The Secure Real-time Transport Protocol (SRTP)".

[18]

RFC 5104 (2008): "Codec Control Messages in the RTP Audio-Visual Profile with Feedback (AVPF)".

[19]

RFC 4588 (2006): "RTP Retransmission Payload Format".

[20]

TS 26.114: " IP Multimedia Subsystem (IMS); Multimedia Telephony; Media handling and interaction".

[21]

RFC 9112 (2022): "HTTP/1.1".

[22]

RFC 7478 (2015): "Web Real-Time Communication Use Cases and Requirements".

[23]

TS 26.119: "Media Capabilities for Augmented Reality"

[24]

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

[25]

Apple: "Getting Raw Accelerometer Events", https://developer.apple.com/documentation/coremotion/getting_raw_accelerometer_events.

[26]

Google: "Sensor Coordinate System", https://developer.android.com/develop/sensors-and-location/sensors/sensors_overview.

[27]

ITU-R Recommendation BT.601-7 (03/2011): "Studio encoding parameters of digital television for standard 4:3 and wide screen 16:9 aspect ratios".

[28]

Microsoft: "Microphone Array Geometry Descriptor Format", https://learn.microsoft.com/en-us/windows-hardware/drivers/audio/microphone-array-geometry-descriptor-format.

[29]

RFC 8831 (2021): "WebRTC Data Channels".

[30]

RFC 8261 (2017): "Datagram Transport Layer Security (DTLS) Encapsulation of SCTP Packets".

[31]

W3C Recommendation: WebRTC: Real-Time Communication in Browsers, March 2023. https://www.w3.org/TR/webrtc/

[32]

RFC 7874 (2016): "WebRTC Audio Codec and Processing Requirements"

[33]

RFC 7742 (2016): "WebRTC Video Processing and Codec Requirements"

[34]

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

[35]

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

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 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.

RTC Application:

A Native WebRTC Application or a Web App that is compliant with the profile of a WebRTC-based application defined in the present document.

RTC endpoint:

A WebRTC endpoint incorporating an instance of the WebRTC Framework that is capable of participating in an RTC session and which is deployed either in the RTC Access Function of a UE or in the Media Function of an RTC AS.

RTC Client:

UE function comprising an RTC Access Function and an RTC Media Session Handler which interacts with functions in the network and UE applications.

RTC Access Function:

A set of functions including an instance of the WebRTC Framework. The RTC Access Function exchanges real-time media with one or more RTC endpoints via reference point RTC-4m or RTC-12, and the RTC Access Function exchanges signalling messages with WebRTC Signalling Function via reference point RTC-4s. Also, the RTC Access Function exposes client APIs defined in the present document to the RTC Application at reference point RTC-7 and to the RTC Media Session Handler at reference point RTC-11.

3.2 Symbols p. 10

Void

3.3 Abbreviations p. 10

For the purposes of 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.

3DoF

Three Degrees of Freedom

6DoF

Six Degrees of Freedom

API

Application Programming Interface

Augmented Reality

DRB

Data Radio Bearer

DTLS

Datagram Transport Layer Security

FFS

For Further Study

FoV

Field of View

HMD

Head-Mounted Display

HTTP

Hyper-Text Transfer Protocol

ICE

Interactive Connectivity Establishment

IMU

Inertial Measurement Unit

iRTC

Immersive Real-Time Communication

LIDAR

Light Detection and Ranging

Mixed Reality

MNO

Mobile Network Operator

NAT

Network Address Translation

OTT

Over-The-Top

RGB

Red-Green-Blue colour space

RGBD

Red-Green-Blue-Depth

RTC

Real-Time Communication

RTP

Real-time Transport Protocol

RWT

Response Wait Time

SCTP

Stream Control Transmission Protocol

SDO

Standards Developing Organization

SLAM

Simultaneous Localization And Mapping

SRTCP

Secure Real-time Transport Control Protocol

SRTP

Secure Real-time Transport Protocol

SSE

Server-Sent Events

STUN

Session Traversal Utilities for NAT

SWAP

Simple WebRTC Application Protocol

TLS

Transport Layer Security

ToF

Time of Flight

TURN

Traversal Using Relays around NAT

WebRTC

Web Real-Time Communication

XHR

XMLHttpRequest

Extended Reality