3 Definitions and abbreviations

26.2473GPPProgressive Download and Dynamic Adaptive Streaming over HTTP (3GP-DASH)Release 17Transparent end-to-end Packet-switched Streaming Service (PSS)TS

3.1 Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 [7], in ISO/IEC 23009-1 [43], section 3.1, 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 [7].

frame-packed stereoscopic 3D video: a video consisting of two views in which both views were packed into a single stream before compression.

multiview stereoscopic 3D video: a video consisting of two views packed into a single stream during compression.

interactivity event: Time interval, whose occurrence may be either pre-scheduled or unscheduled during the presentation of a main program, within which the user may engage with and/or consume interactive content.

rebuffering: a condition occuring in the media buffer when the buffer fill level is sufficiently depleted and buffer exhaust is imminent, typically resulting in suspended media playout.

3.2 Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 [7] 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 [7].

3GP 3GPP file format

3GP-DASH 3GPP Dynamic Adaptive Streaming over HTTP

5GMS 5G Media Streaming

AHS Adaptive HTTP Streaming

A/V Audio/Video

AVC Advanced Video Coding

CMAF Common Media Application Format

DANE DASH-Aware Network Element

DM Device Management

DNS Domain Name System

DRM Digital Rights Management

FQDN Fully Qualified Domain Name

HSD HTTP Streaming and Download

HTML Hypertext Markup Language

HTTP Hypertext Transfer Protocol

HTTPS Hypertext Transfer Protocol Secure

IDR Instantaneous Decoding Refresh

MPD Media Presentation Description

MPEG-2 TS Moving Picture Experts Group Transport Stream

MIME Multipurpose Internet Mail Extensions

MOS Mean Opinion Score

NAS Non-Access Stratum

OMA Open Mobile Alliance

PDCF Packetized DRM Content Format

PER Parameters Enhancing Reception

PSS Packet-switched Streaming Service

QMC QoE Measurement Collection

QoE Quality-of-Experience

RFC Request For Comments

RRC Radio Resource Control

RTP Real-time Transport Protocol

SAND Server and Network Assisted DASH

SMIL Synchronised Multimedia Integration Language

TLS Transport Layer Security

URI Uniform Resource Identifier

URL Uniform Resource Locator

URN Uniform Resource Name

UTF-8 Unicode Transformation Format (the 8-bit form)

XML eXtensible Markup Language

3.3 Conventions

The naming conventions of ISO/IEC 23009-1 [43], clause 3.3 apply in this specification.