3 Definitions, symbols and abbreviations

24.5813GPPMission Critical Video (MCVideo) media plane controlProtocol specificationRelease 18TS

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].

Transmission request queue: The transmission request queue used by the transmission control server to queue received Transmission Request messages.

Controlling MCVideo function: The MCVideo server performing a controlling role.

Effective priority: The priority decision determined by the transmission control server based on multiple input parameters like transmission priority, participant type, type of call etc. of the current transmission request and of the current participant to which transmission is granted if any and the local policy.

MBMS bearer: The service provided by the EPS to deliver the same IP datagrams to multiple receivers in a designated location.

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, like UDP port, associated to a group or the MBMS subchannel used to e.g. inform when a transmission call is started or ended.

Media plane control protocols: Protocols in the media plane used for transmission control, pre-established session call control and MBMS subchannel control.

Participating MCVideo function: The MCVideo server performing a participating role.

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.281 [11] apply:

Transmission control

Transmission participant

Transmission control server

Group call

MCVideo call

MCVideo server performing a controlling role

MCVideo server performing a participating role

MCVideo user

Mission critical video

Private call

SIP core

For the purposes of the present document, the following terms and definitions given in 3GPP TS 33.179 [14] apply:

Client Server Key (CSK)

Client Server Key Identifier (CSK-ID)

Group Master Key (GMK)

Group Master Key Identifier (GMK-ID)

Multicast Key for Floor Control (MKFC)

Identifier of Multicast Key for Floor Control (MKFC-ID)

Multicast Signalling Key (MuSiK)

Multicast Signalling Key Identifier (MuSiK-ID)

Private Call Key (PCK)

Private Call Key Identifier (PCK-ID)

Signalling Protection Key (SPK)

Signalling Protection Key Identifier (SPK-ID)

MBMS SubChannel Control Key (MSCCK)

MBMS SubChannel Control Key Identifier (MSCCK-ID)

For the purposes of the present document, the following terms and definitions given in IETF RFC 3711 [16] apply:

SRTP master key (SRTP-MK)

SRTP master key identifier (SRTP-MKI)

SRTP master salt (SRTP-MS)

3.2 Symbols

3.3 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].

AS Application Server

D2D Device to Device

DL Downlink

GCS AS Group Communication Service Application Server

GMK Group Management Key

GMS Group Management Server

GUK-ID Group User Key Identifier

IP Internet Protocol

MBMS Multimedia Broadcast and Multicast Service

MCVideo Mission Critical Video

MKI Master Key Identifier

PCK Private Call Key

PCK-ID Private Call Identifier

RFC Request For Comment

RTCP RTP Control Protocol

RTP Real-time Transport Protocol

SRTCP Secure RTCP

SRTP Secure RTP

SSRC Synchronization SouRCe

TEK Traffic-Encrypting Key

TMGI Temporary Mobile Group Identity

UE User Equipment