Content for TS 26.506 Word version: 18.3.0

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1 Scope p. 7

The present document specifies an architecture for real-time media communication integrated into the 5G System. To support Mobile Network Operator (MNO) and third-party services for real-time media, essential functionalities and interfaces are specified. The primary scope of this Technical Specification is the documentation of the following aspects:

The definition of a real-time media communication architecture mapped to the 5GS architecture, with relevant core building blocks, reference point, and interfaces to support modern operator and third-party media services, based on the 5GMS architecture.
Definition of all relevant reference points and interfaces to support different collaboration scenarios between 5G System operator and third-party media communication service provider, including but not limited to an Augmented Reality (AR) media communication service provider.
Call flows and procedures for different real-time communication service types.
Specification to support functionalities relevant to AR such as split-rendering or spatial computing on top of a 5G System based on this architecture.

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. 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]

TR 26.998: "Support of 5G glass-type Augmented Reality / Mixed Reality (AR/MR) devices".

[3]

TS 26.119: "Media Capabilities for Augmented Reality".

[4]

TS 26.113: "Enabler for Immersive Real-time Communication".

[5]

TR 26.930: "Study on the enhancement for Immersive Real-Time communication for WebRTC".

[6]

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

[7]

TS 23.558: "Architecture for enabling Edge Applications".

[8]

TS 38.321: "NR; Medium Access Control (MAC) protocol specification".

[9]

TS 36.321: "LTE; Medium Access Control (MAC) protocol specification".

[10]

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

[11]

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

[12]

TS 23.548: "5G System Enhancements for Edge Computing; Stage 2".

[13]

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

3 Definitions of terms, symbols and abbreviations p. 8

3.1 Terms p. 8

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.

WebRTC Framework:

A well-defined subset of the WebRTC protocol stack for data transport and data framing that supports real-time media communication between an RTC endpoint and its peer(s).

3.2 Symbols p. 8

For the purposes of the present document, the following symbols apply:

3.3 Abbreviations p. 8

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.

Augmented Reality

EAS

Edge Application Server

ECS

Edge Configuration Server

EEC

Edge Enabler Client

EES

Edge Enabler Server

IETF

Internet Engineering Task Force

ICE

Interactive Connectivity Establishment

IMS

IP Multimedia Subsystem

MCU

Multi-point Control Unit

MNO

Mobile Network Operator

Mixed Reality

MSH

Media Session Handler

MTSI

Multimedia Telephony Service for IMS

NAT

Network Address Translation

RTC

Real-Time Media Communication

SDP

Session Description Protocol

SFU

Selective Forwarding Unit

STUN

Session Traversal Utilities for NAT

TURN

Traversal Using Relays around NAT

W3C

World Wide Web Consortium

WebRTC

Web Real-Time Communication