3 Definitions and abbreviations

26.3463GPPMultimedia Broadcast/Multicast Service (MBMS)Protocols and codecsRelease 17TS

3.1 Definitions

For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 [1] and the following apply:

Application content component: An individual content component of an MBMS User Service, such as a video or audio media stream, or a non-real-time file, delivered by an MBMS transport session, and is available to and can be used by the MBMS application.

Application Service: An end-user service for which the entry point document is contained in the User Service Description and whereby all associated content components are delivered through one or more MBMS User Services via broadcast and/or unicast bearers.

Broadcast session: See 3GPP TS 22.146 [2].

Forward Error Correction (FEC): in the context of MBMS, a FEC mechanism is used at the application layer to allow MBMS receivers to recover lost SDUs.

FLUTE channel: equivalent to an ALC/LCT channel.
An ALC/LCT channel is defined by the combination of a sender and an address associated with the channel by the sender (RFC 3926 [9]).

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

Hybrid DASH/HLS service: a media streaming service which can be consumed both by DASH clients and HLS clients.

Multicast joining: See 3GPP TS 22.146 [2].

Multicast session: See 3GPP TS 22.146 [2].

Multimedia Broadcast/Multicast Service (MBMS): See 3GPP TS 22.146 [2].

MBMS application: The application which resides in or interfaces with the UE, and which provides to the end-user an application service by using one or more application content components of one or more MBMS User Services.

MBMS over a Single Frequency Network: See 3GPP TS 25.346 [5].

MBMS User Service: The transport-level service, comprising one or more application content components, delivered by the MBMS bearer service across one or more Broadcast and/or Multicast sessions, and/or delivered by the unicast bearer service. The application content components of the MBMS User Service, in part or in whole, are provided to the MBMS application.

See 3GPP TS 22.246 [3].

MBMS user service discovery/announcement: user service discovery refers to methods for the UE to obtain the list of available MBMS user services along with information on the user service and the user service announcement refers to methods for the MBMS service provider to make the list of available MBMS user services along with information on the user service available to the UE.

MBMS user service initiation: UE mechanisms to setup the reception of MBMS user service data
The initiation procedure takes place after the discovery of the MBMS user service.

MBMS delivery method: mechanism used by a MBMS user service to deliver content.
An MBMS delivery method uses MBMS bearers in delivering content and may make use of associated procedures.

MBMS download delivery method: delivery of discrete objects (e.g. files) by means of a MBMS download session.

MBMS group communication delivery method: delivery of group communication service data by means of the BM-SC ingesting UDP/IP packets from a group communications server and forwarding them over the MBMS path provided by the MBMS Bearer Service.

MBMS streaming delivery method: delivery of continuous media (e.g. real-time video) by means of a MBMS streaming session.

MBMS Transparent delivery method: transparent delivery of application data by means of an MBMS Transparent session.

MBMS download session: time, protocols and protocol state (i.e. parameters) which define sender and receiver configuration for the download of content files.

MBMS streaming session: time, protocols and protocol state (i.e. parameters) which define sender and receiver configuration for the streaming of content.

MBMS Transparent session: time, area, protocols, and protocol state (i.e. parameters) which define sender and receiver configuration for the transparent delivery of application data flows.

Partial-File-Accept Request: HTTP GET request that includes a partial-accept header in the HTTP request header.

Receive Only Mode: See 3GPP TS 23.246 [4].

Receive-Only-Mode (ROM) service: A type of eMBMS broadcast service receivable by a UE configured in Receive Only Mode. A TMGI associated with a ROM service shall contains a standardized [MCC+MNC] value. See Annex E of 3GPP TS 23.246 [4] and TS 24.116 [131] for further details on Receive Only Mode.

RTP Session: The RTP and RTCP traffic sent to a specific IP multicast address and port pair (one port each for RTP and RTCP) during the time period the session is specified to exist. An RTP session is used to transport a single media type (e.g. audio, video, or text). An RTP session may contain several different streams of RTP packets using different SSRCs.

Stereoscopic 3D video: a video bitstream consisting of two views.

Unicast Bearer Service: Synonymously used as the term "UMTS Bearer Services with interactive and/or streaming traffic classes".

3.2 Abbreviations

For the purposes of the present document, abbreviations given in 3GPP TR 21.905 [1] and the following apply:

ADPD Associated Delivery Procedure Description

ADU Application Data Unit

ALC Asynchronous Layered Coding

API Application Programming Interface

AS Application Server

ASD Application Service Description

AVC Advanced Video Coding

BM-SC Broadcast-Multicast – Service Centre

CC Congestion Control

CPB Coding Picture Buffer

CVS Coded Video Sequence

DASH Dynamic Adaptive Streaming over HTTP

ERT Expected Residual Time

ESI Encoding Symbol ID

FDT File Delivery Table

FLUTE File deLivery over Unidirectional Transport

FMT Feedback Message Type

GCS Group Communication Service

GCSE Group Communication Service Enabler

HDR High Dynamic Range

HDTV High-DefinitionTeleVision

HEVC High Efficiency Video Coding

HLS HTTP Live Streaming

IANA Internet Assigned Numbers Authority

IDR Instantaneous Decoding Refresh

IRAP Intra Random Access Point

ISD Initialization Segment Description

LCT Layered Coding Transport

LI Leap Indicator

MBMS SAI MBMS Service Area Identity

MCPTT Mission Critical Push to Talk

MIME Multipurpose Internet Mail Extensions

MMS Multimedia Messaging Service

MooD MBMS operation on Demand

MPD Media Presentation Description

MSK MBMS Service Key

MTK MBMS Traffic Key

MUK MBMS User Key

NAL Network Abstraction Layer

NTP Network Time Protocol

OMNA Open Mobile Naming Authority

PAC Proxy Auto-Config

PSS Packet-switched Streaming Service

PTT Push To Talk

RASL Random Access Skipped Leading picture

ROM Receive-Only-Mode

SA File Service Announcement File

SACH Service Announcement CHannel

SBN Source Block Number

SCT Sender Current Time

SEI Supplemental Enhancement Information

SNTP Simple Network Time Protocol

TMGI Temporary Mobile Group Identity

TOI Transport Object Identifier

TSI Transport Session Identifier

UHD Ultra High Definition

URL Uniform Resource Locator

USBD User Service Bundle Description

USD User Service Description

UTC Universal Time Coordinated

VCL Video Coding Layer

VR Virtual Reality