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Content for  TS 24.581  Word version:  18.4.0

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1 Scope  2 References  3 Definitions, symbols and abbreviations  3.1 Definitions  3.2 Symbols  3.3 Abbreviations 
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1  Scope  p. 16

The present document specifies the media plane control and transmission control protocols and interactions with the media needed to support Mission Critical Video (MCVideo) service.
The MCVideo service and its associated media plane control protocols can be used for public safety applications and also for general commercial applications (e.g., utility companies and railways).
The present document is applicable to User Equipment (UE) supporting MCVideo client, and MCVideo server supporting media distribution function and transmission control server.
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2  References  p. 16

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 24.281: "Mission Critical Video (MCVideo) call control; Protocol specification".
[3]
RFC 3550:  "RTP: A Transport Protocol for Real-Time Applications".
[4]
RFC 3711:  "The Secure Real-time Transport Protocol (SRTP)".
[5]
TS 24.481: "Mission Critical Services (MCS) group management Protocol specification".
[6]
TS 24.483: "Mission Critical Services (MCS) Management Object (MO)".
[7]
TS 24.484: "Mission Critical Services (MCS) configuration management protocol specification".
[8]
TS 33.180: "Security of the mission critical service".
[9]
RFC 3830:  "MIKEY: Multimedia Internet KEYing".
[10]
RFC 6509:  "MIKEY-SAKKE: Sakai-Kashar Key Encryption in Multimedia Internet KEYing (MIKEY)".
[11]
TS 23.281: "Functional architecture and information flows to support Mission Critical Video (MCVideo); Stage 2".
[12]
TS 23.280: "Common functional architecture to support mission critical services; Stage 2".
[13]
TS 26.346: "Multimedia Broadcast/Multicast Service (MBMS); Protocols and codecs".
[14]
TS 24.008: "Mobile radio interface Layer 3 specification; Core network protocols; Stage 3".
[15]
TS 29.468: "Group Communication System Enablers for LTE (GCSE_LTE); MB2 Reference Point; Stage 3".
[16]
TS 24.501: "Technical Specification Group Core Network and Terminals; Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3".
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3  Definitions, symbols and abbreviations  p. 17

3.1  Definitions  p. 17

For the purposes of the present document, the terms and definitions given in TR 21.905 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.
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 TS 23.281 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 TS 33.180 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 apply:
SRTP master key (SRTP-MK)
SRTP master key identifier (SRTP-MKI)
SRTP master salt (SRTP-MS)
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3.2  Symbols  p. 18

3.3  Abbreviations  p. 18

For the purposes of the present document, the abbreviations given in TR 21.905 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.
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
MBS
Multicast/Broadcast 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
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