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Content for  TS 29.380  Word version:  17.0.0

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1  ScopeWord‑p. 10

The present document specifies the media plane control protocols and interactions with the media needed to support a Mission Critical Push To Talk (MCPTT) system interworking with a Land Mobile Radio (LMR) system. This interworking includes both the signalling and the media planes between the MCPTT system and the LMR system. The function between the MCPTT system and the LMR system is referred to as an Interworking Function (IWF).
The IWF supports the basic group and other features as specified in TS 23.283.
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2  References

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 24.379: "Mission Critical Push To Talk (MCPTT) call control Protocol specification".
[3]
RFC 3550:  "RTP: A Transport Protocol for Real-Time Applications".
[4]
TS 24.483: "Mission Critical Services (MCS) Management Object (MO)".
[5]
TS 23.379: "Functional architecture and information flows to support mission critical communication services; Stage 2".
[6]
TS 29.468: "Group Communication System Enablers for LTE (GCSE_LTE); MB2 Reference Point; Stage 3".
[7]
RFC 5761:  "Multiplexing RTP Data and Control Packets on a Single Port".
[8]  Void.
[9]
TS 25.446: "MBMS synchronization protocol (SYNC)".
[10]
TS 29.281: "General Packet Radio System (GPRS) Tunnelling Protocol User Plane (GTPv1-U)".
[11]
TS 24.008: "Mobile radio interface layer 3 specification; Core Network protocols; Stage 3".
[12]
TS 24.481: "Mission Critical Services (MCS) group management Protocol specification".
[13]
TS 24.484: "Mission Critical Services (MCS) configuration management protocol specification".
[14]  Void.
[15]
RFC 3830:  "MIKEY: Multimedia Internet KEYing".
[16]
RFC 3711:  "The Secure Real-time Protocol (SRTP)".
[17]
RFC 6509:  "MIKEY-SAKKE: Sakai-Kashar Key Encryption in Multimedia Internet KEYing (MIKEY)".
[18]
TS 33.180: "Security of the mission critical service".
[19]
TS 23.032: "Universal Geographical Area Description (GAD)".
[20]
RFC 5795:  "The Robust Header Compression (ROHC) Framework".
[21]
RFC 3095:  "RObust Header Compression (ROHC): Framework and four profiles: RTP, UDP, ESP, and uncompressed".
[22]
RFC 5225:  "RObust Header Compression Version 2 (ROHCv2): Profiles for RTP, UDP, IP, ESP and UDP-Lite".
[23]
TS 23.280: "Common functional architecture to support mission critical services; Stage 2".
[24]
TS 23.283: "Mission Critical Communication Interworking with Land Mobile Radio Systems".
[25]
TS 24.380: "Mission Critical Push To Talk (MCPTT) media plane control".
[26]
TS 29.379: "Mission Critical Push To Talk (MCPTT) call control interworking with LMR systems".
[27]
TS 22.179: "Mission Critical Push To Talk (MCPTT) Stage 1".
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3  Definitions of terms, symbols and abbreviationsWord‑p. 11

3.1  Terms

For the purposes of the present document, the terms 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.
Floor participant:
The floor participant functional entity is responsible for floor requests. In the present document this term can be a floor participant that can be in either an MCPTT system (ref. TS 23.379) or in an IWF.
IWF floor control server:
A floor control server that is in the IWF.
IWF floor participant:
A floor participant that is in the IWF.
IWF media endpoint:
A media endpoint that is in the IWF.
Media endpoint:
The end producer or consumer of media and floor control traffic (see also "IWF media endpoint").
For the purposes of the present document, the following terms and definitions given in TS 23.379 apply:
Floor control
Floor participant
Floor control server
Group call
MCPTT call
Mission critical push to talk
Private call
SIP core
For the purposes of the present document, the following terms and definitions given in TS 23.283 apply:
Interworking Function (IWF)
For the purposes of the present document, the following terms and definitions given in TS 29.379 apply:
IWF performing the controlling role
IWF performing the non-controlling
IWF performing the participating role
For the purposes of the present document, the following terms and definitions given in TS 24.380 apply:
Active floor request queue
Conversation
Effective priority
Media burst
Media plane control protocols
Passive floor request queue
For the purposes of the present document, the following terms and definitions given in TS 33.180 apply:
Group Master Key (GMK)
Group Master Key Identifier (GMK-ID)
Private Call Key (PCK)
Private Call Key Identifier (PCK-ID)
Signalling Protection Key (SPK)
Signalling Protection Key Identifier (SPK-ID)
For the purposes of the present document, the following terms and definitions given in 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  AbbreviationsWord‑p. 12

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.
GMK
Group Management Key
GMK-ID
Group Master Key Identifier
GMS
Group Management Server
GUK-ID
Group User Key Identifier
IP
Internet Protocol
MBMS
Multimedia Broadcast and Multicast Service
MCPTT
Mission Critical Push To Talk
PCK
Private Call Key
PCK-ID
Private Call Key Identifier
PTT
Push-To-Talk
RFC
Request For Comment
RTCP
RTP Control Protocol
RTP
Real-time Transport Protocol
SPK
Signalling Protection Key
SPK-ID
Signalling Protection Key Identifier
SRTCP
Secure RTCP
SRTP
Secure RTP
SRTP-MK
SRTP master key
SRTP-MKI
SRTP master key identifier
SRTP-MS
SRTP master salt
SSRC
Synchronization SouRCe
UE
User Equipment
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