3 Definitions and abbreviations

26.2373GPPIP Multimedia Subsystem (IMS) based Packet Switch Streaming (PSS) and Multimedia Broadcast/Multicast Service (MBMS) User ServiceProtocolsRelease 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:

On Demand: users can select their required content, for example with the assistance of the Electronic Programme Guide (EPG), at the user preferred time.

NOTE: The content is then transmitted uniquely (unicast) to that consumer who can usually use trick-modes functionalities to control their viewing of the content. e.g. TV Content on Demand (CoD)

IMS registration: registration procedure for a public user identity initiated by the UE in the absence of any valid registration

Live: content is streamed and intended for reception by anyone where the consumer has no control over the content or timing of what he receives, apart from the ability to select a particular channel. e.g. linear TV.

"Non-IMS" BM-SC: BM-SC function as defined in 3GPP TS 23.246 [5] and 3GPP TS 26.346 [11] without any IMS support

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

MBMS User Services: MBMS User Service may use more than one Multimedia Broadcast/Multicast Service (bearer service) and more than one Broadcast and/or Multicast session
(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 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 streaming delivery method: delivery of continuous media (e.g. real-time video) by means of a MBMS streaming session

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

PSS client: client for the 3GPP packet switched streaming service based on the IETF RTSP/SDP and/or HTTP standards, with possible additional 3GPP requirements according to the present document

PSS server: server for the 3GPP packet switched streaming service based on the IETF RTSP/SDP and/or HTTP standards, with possible additional 3GPP requirements according to the present document

Trick Play: streaming playback mode during which the user can control playback by playing, seeking, pausing, fast forwarding and fast rewinding

3.2 Abbreviations

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

BM-SC Broadcast-Multicast – Service Centre

CoD Content on Demand

ESG Electronic Service Guide

GGSN Gateway GPRS Serving Node

IMPI IMS Private Identity

IMPU IMS Public Identity

IMS IP Multimedia Subsystem

IUT Inter UE Session Transfer

IP Internet Protocol

MBMS Multimedia Broadcast/Multicast Service

PSS Packet Switch Streaming

PSI Public Service Identity

RTP Real-Time transport Protocol

RTSP Real-Time Streaming Protocol

SCC Service Centralization and Continuity

SCF Service Control Function

SDF Service Discovery Function

SDP Session Description Protocol

SSF Service Selection Function

UE User Equipment

URI Uniform Resource Identifier

USD User Service Description