Content for TS 29.380 Word version: 18.0.0

1 Scope 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.

2 References p. 10

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".

3 Definitions of terms, symbols and abbreviations p. 11

3.1 Terms p. 11

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)

3.2 Abbreviations 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

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

User Equipment