3 Definitions and abbreviations

23.4793GPPRelease 17Technical Specification Group Services and System AspectsTSUE MBMS APIs for Mission Critical Services

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. A term defined in the present document takes precedence over the definition of the same term, if any, in 3GPP TR 21.905 [1].

MC MBMS API: An application programming interface on the UE to enable the use of MBMS bearer service for mission critical applications.

MBMS bearer availability: Presence of the TMGI identifying an MBMS bearer within the radio control channels.

MBMS bearer quality monitoring: Continuous evaluation of the reception quality of an MBMS bearer, with or without data being received on the MBMS bearer.

MBMS subchannel: A logical channel which uses resources of an activated and announced MBMS bearer identified by the TMGI of the MBMS bearer and additional parameters, e.g. UDP port.

3.2 Abbreviations

For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 [1] and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in 3GPP TR 21.905 [1].

API Application Programming Interface

BM-SC Broadcast Multicast Service Centre

ECGI E-UTRAN Cell Global Identifier

E-UTRAN Evolved Universal Terrestrial Radio Access Network

FEC Forward Error Correction

MBMS Multimedia Broadcast and Multicast Service

MCA MC Application

MC-MUA MC MBMS user agent

MCCH Multicast Control Channel

MCData Mission Critical Data

MCPTT Mission Critical Push To Talk

MCVideo Mission Critical Video

ROHC Robust Header Compression

SAI Service Area Identity

SDP Session Description Protocol

TMGI Temporary Mobile Group Identity