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TS 23.379SA6
Functional architecture and information flows
to support Mission Critical Push To Talk (MCPTT)

use "3GPP‑Page" to get the Word version
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for a better overview, the Table of Contents (ToC) is reproduced
V17.2.0 (Wzip)2020/03  245 p.
V16.5.0 (Wzip)  2019/12  239 p.
V15.6.0 (PDF)  2019/06  202 p.
V14.7.0  2018/09  184 p.

WI Acronym:  MCImp-eMCPTT
Rapporteur:  Mr. Lazara, DominicMotorola Solutions UK Ltd.

This document specifies the functional architecture, procedures and information flows needed to support the mission critical push to talk (MCPTT) service. The MCPTT service utilizes the common functional architecture to support MC services over LTE including the common services core defined in TS 23.280. Support for both MCPTT group calls and MCPTT private calls operating in on-network and off-network modes of operation is specified.
3GPP 23.379 - Functional model for application plane of MCPTT service
The corresponding service requirements are defined in TS 22.179 and TS 22.280.
The present document is applicable primarily to MCPTT voice service using E-UTRAN access based on the EPC architecture defined in TS 23.401. Certain application functions of the MCPTT service such as dispatch and administrative functions could also be supported via non-3GPP access networks but no additional functionality is specified to support non-3GPP access.
The MCPTT service requires preferential handling compared to normal telecommunication services e.g. in support of police or fire brigade including the handling of prioritised MCPTT calls for emergency and imminent threats.
The MCPTT service can be used for public safety applications and also for general commercial applications e.g. utility companies and railways.
In the present document, MCPTT calls between MCPTT users on different MCPTT systems are considered.

essential Table of Contents for  TS 23.379  Word version:   17.2.0

each title links to the equivalent title in the full ToC
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1  ScopeWord-p. 12
2  ReferencesWord-p. 12
3  Definitions, symbols and abbreviationsWord-p. 13
4  IntroductionWord-p. 16
5  Architectural requirementsWord-p. 16
6  Involved business relationshipsWord-p. 18
7  Functional modelWord-p. 18
7.1  GeneralWord-p. 18
7.2  Description of the planesWord-p. 19
7.3  Functional model descriptionWord-p. 19
7.4  Functional entities descriptionWord-p. 21
7.5  Reference pointsWord-p. 24
8  IdentitiesUpWord-p. 26
9  Application of functional model to deploymentsWord-p. 26
10  Procedures and information flowsWord-p. 27
10.1  MCPTT service configurationWord-p. 27
10.2  User authentication and authorization for MCPTT serviceWord-p. 27
10.3  Affiliation and de-affiliation to/from MCPTT group(s)Word-p. 28
10.3a  Activation and de-activation of/from functional alias(es) [R15]Word-p. 28
10.4  MCPTT group selectionWord-p. 28
10.5  Pre-established session (on-network)Word-p. 30
10.6  Group callWord-p. 34
10.6.1  GeneralWord-p. 34
10.6.2  On-network group callUpWord-p. 34
10.6.3  Off-network group callWord-p. 117
10.7  Private callWord-p. 126
10.7.1  GeneralUpWord-p. 126
10.7.2  Private call in on-networkWord-p. 126
10.7.3  Private call in off-networkWord-p. 143
10.7.4  MCPTT private call call-back requestWord-p. 148
10.7.5  MCPTT call forwarding for private calls [R16]Word-p. 151
10.7.6  Call transfer for MCPTT private calls [R17]Word-p. 158
10.8  Simultaneous session for MCPTT calls (on-network)Word-p. 164
10.9  Floor controlWord-p. 164
10.9.1  Floor control for on-network MCPTT serviceWord-p. 164
10.9.2  Floor control for off-network MCPTT serviceWord-p. 190
10.10  Use of MBMS transmission (on-network)Word-p. 197
10.11  MCPTT resource management (on-network)Word-p. 203
10.12  MCPTT media plane transmissions with partner MCPTT systems (on-network)Word-p. 203
10.13  Location information (on-network)Word-p. 205
10.14  Ambient listening callWord-p. 205
10.15  First-to-answer call setupWord-p. 212
10.16  Remotely initiated MCPTT callWord-p. 217
10.17  Support for multiple devicesWord-p. 220
10.18  Subscription and notification for functional alias [R16]Word-p. 220
A (Normative)  MCPTT related configuration dataWord-p. 223
B  Local UE settings for MCPTTWord-p. 240
C  Change historyWord-p. 241

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