ETSI TS 124 380 V14.12.0 (2022-01)

LTE; Mission Critical Push To Talk (MCPTT) media plane control; Protocol specification (3GPP TS 24.380 version 14.12.0 Release 14)

RTS/TSGC-0124380vec0

General Information

• Status: Not Published
• Technical Committee: 3GPP CT 1 - MM/CC/SM [lu] (formely CN1)
• Current Stage: 12 - Completion
• Completion Date: 26-Jan-2022

Standards Content (Sample)

TECHNICAL SPECIFICATION
LTE;
Mission Critical Push To Talk (MCPTT) media plane control;
Protocol specification
(3GPP TS 24.380 version 14.12.0 Release 14)

3GPP TS 24.380 version 14.12.0 Release 14 1 ETSI TS 124 380 V14.12.0 (2022-01)

Reference
RTS/TSGC-0124380vec0
Keywords
LTE
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ETSI
3GPP TS 24.380 version 14.12.0 Release 14 2 ETSI TS 124 380 V14.12.0 (2022-01)
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ETSI
3GPP TS 24.380 version 14.12.0 Release 14 3 ETSI TS 124 380 V14.12.0 (2022-01)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 14
1 Scope . 15
2 References . 15
3 Definitions and abbreviations . 16
3.1 Definitions . 16
3.2 Abbreviations . 17
4 General . 18
4.1 Overview . 18
4.1.1 Floor Control . 18
4.1.1.1 General . 18
4.1.1.2 On-network floor control . 18
4.1.1.3 Off-network floor control . 19
4.1.1.4 Determine on-network effective priority . 19
4.1.1.5 Determine off-network effective priority . 20
4.1.2 Pre-established session call control. 20
4.1.2.1 General . 20
4.1.2.2 Call setup over pre-established session . 21
4.1.2.3 Release of a call which uses a pre-established session . 21
4.1.3 MBMS subchannel control . 21
4.1.3.1 General . 21
4.1.3.2 Start of a conversation . 22
4.1.3.3 During a conversation . 22
4.1.3.4 Ending the conversation . 22
4.2 Internal structure of media plane control entities . 23
4.2.1 Controlling MCPTT function . 23
4.2.2 MCPTT client . 24
4.2.3 Participating MCPTT function . 26
4.2.3.1 General . 26
4.2.3.2 Internal structure of the participating MCPTT function . 26
4.2.3.3 The roles of the participating MCPTT function . 27
4.2.3.3.1 For the floor control procedures . 27
4.2.3.3.2 For the call over pre-established session procedures . 27
4.2.3.3.3 For the use of MBMS bearer procedures . 27
4.2.4 Non-controlling MCPTT function of an MCPTT group . 28
4.3 The media plane control channel . 29
4.3.1 General . 29
4.3.2 Control channel realization . 29
4.3.3 Establishing a media plane control channel . 30
4.3.3.1 General . 30
5 Entities . 30
5.1 General . 30
5.2 MCPTT client . 30
5.2.1 Introduction. 30
5.2.2 Floor participant in on-network mode . 31
5.2.3 Floor participant in off-network mode . 31
5.3 Controlling MCPTT function . 31
5.4 Participating MCPTT function . 32
5.5 Non-controlling MCPTT function . 32
6 On-network floor control. 32
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3GPP TS 24.380 version 14.12.0 Release 14 4 ETSI TS 124 380 V14.12.0 (2022-01)
6.1 General . 32
6.2 Floor participant procedures . 33
6.2.1 Floor participant procedures at MCPTT session initializatio n . 33
6.2.2 Floor participant procedures at MCPTT call release . 33
6.2.3 Floor participant procedures at MCPTT call modification . 33
6.2.4 Floor participant state transition diagram for basic operation . 33
6.2.4.1 General . 33
6.2.4.2 State: 'Start-stop' . 35
6.2.4.2.1 General . 35
6.2.4.2.2 MCPTT call initiated, originating MCPTT user . 35
6.2.4.2.3 MCPTT call established, terminating MCPTT user . 35
6.2.4.3 State: 'U: has no permission' . 35
6.2.4.3.1 General . 35
6.2.4.3.2 Receive Floor Idle message (R: Floor Idle) . 35
6.2.4.3.3 Receive Floor Taken message (R: Floor Taken) . 36
6.2.4.3.4 Receive RTP media packets (R: RTP media) . 36
6.2.4.3.5 Send Floor Request message (PTT button pressed) . 36
6.2.4.3.6 Timer T103 (End of RTP media) expired . 36
6.2.4.4 State: 'U: pending Request' . 37
6.2.4.4.1 General . 37
6.2.4.4.2 Receive Floor Granted message (R: Floor Granted). 37
6.2.4.4.3 Void . 37
6.2.4.4.4 Receive Floor Deny message (R: Floor Deny) . 37
6.2.4.4.5 Timer T101 (Floor request) expired . 38
6.2.4.4.6 Timer T101 (Floor Request) expired N times . 38
6.2.4.4.7 Receive RTP media packets (R: RTP Media) . 38
6.2.4.4.8 Send Floor Release message (PTT button released) . 38
6.2.4.4.9 Receive Floor Queue Position Info message (R: Floor Queue Position Info) . 38
6.2.4.5 State: 'U: has permission' . 39
6.2.4.5.1 General . 39
6.2.4.5.2 Send RTP media packets (RTP media) . 39
6.2.4.5.3 Send Floor Release message (PTT button released) . 39
6.2.4.5.4 Receive Floor Revoke message (R: Floor Revoke) . 40
6.2.4.5.5 Receive Floor Granted message (R: Floor Granted). 40
6.2.4.5.6 Receive RTP media packets (R: RTP Media) . 40
6.2.4.5.7 Receive Floor Idle message (R: Floor Idle) . 40
6.2.4.5.8 Receive Floor Taken message (R: Floor Taken) . 41
6.2.4.6 State: 'U: pending Release' . 41
6.2.4.6.1 General . 41
6.2.4.6.2 Timer T100 (Floor Release) expired . 41
6.2.4.6.3 Timer T100 (Floor release) expired N times . 42
6.2.4.6.4 Receive Floor Idle message (R: Floor Idle) . 42
6.2.4.6.5 Receive Floor Taken message (R: Floor Taken) . 42
6.2.4.6.6 Receive RTP media packets (R: RTP Media) . 42
6.2.4.6.7 Receive Floor Revoke message (R: Floor Revoke) . 43
6.2.4.6.8 Receive Floor Granted message (R: Floor Granted). 43
6.2.4.7 In any state . 43
6.2.4.7.1 General . 43
6.2.4.7.2 Receive MCPTT call release – step 1 (R: MCPTT call release - 1) . 43
6.2.4.7.3 Receive a Floor Control message with a Floor Indicator field (R: Floor Indicator) . 43
6.2.4.8 State: 'Releasing' . 43
6.2.4.8.1 General . 43
6.2.4.8.2 Receive MCPTT call release – step 2 (R: MCPTT call release - 2) . 43
6.2.4.9 State: 'U: queued' . 44
6.2.4.9.1 General . 44
6.2.4.9.2 Receive RTP media packets (R: RTP media) . 44
6.2.4.9.3 Receive Floor Taken message (R: Floor Taken) . 44
6.2.4.9.4 Receive Floor Granted message (R: Floor Granted). 44
6.2.4.9.5 Receive Floor Deny message (R: Floor Deny) . 45
6.2.4.9.6 Send Floor Release message (PTT button released) . 45
6.2.4.9.7 Receive Floor Queue Position Info message (R: Floor Queue Position Info) . 45
6.2.4.9.8 Receive Floor Idle message (R: Floor Idle) . 46
ETSI
3GPP TS 24.380 version 14.12.0 Release 14 5 ETSI TS 124 380 V14.12.0 (2022-01)
6.2.4.9.9 Send Floor Queue Position Request message (S: Floor Queue Position Request) . 46
6.2.4.9.10 Timer T104 (Floor Queue Position Request) expired. 46
6.2.4.9.11 Timer T104 (Floor Queue Position Request) expired N times . 46
6.2.4.9.12 User indication for accept of pending request . 47
6.2.4.9.13 Timer T132 (Queued granted user action) expires . 47
6.3 Floor control server procedures . 47
6.3.1 General . 47
6.3.2 Controlling MCPTT function procedures at MCPTT call initialization . 47
6.3.2.1 General . 47
6.3.2.2 Initial procedures . 47
6.3.2.3 Switching from a non-controlling MCPTT function mode to a controlling MCPTT function
mode . 48
6.3.3 MCPTT floor control procedures at MCPTT call release . 48
6.3.4 Floor control server state transition diagram for general floor control operation . 49
6.3.4.1 General . 49
6.3.4.2 State: 'Start-stop' . 51
6.3.4.2.1 General . 51
6.3.4.2.2 MCPTT call initialization . 51
6.3.4.3 State: 'G: Floor Idle' . 51
6.3.4.3.1 General . 51
6.3.4.3.2 Enter the 'G: Floor Idle' state . 52
6.3.4.3.3 Receive Floor Request message (R: Floor Request) . 53
6.3.4.3.4 Timer T7 (Floor Idle) expired . 53
6.3.4.3.5 Timer T4 (Inactivity) expired . 53
6.3.4.3.6 Receive an implicit floor request (R: Implicit floor request) . 54
6.3.4.4 State: 'G: Floor Taken' . 54
6.3.4.4.1 General . 54
6.3.4.4.2 Enter the 'G: Floor Taken' state . 54
6.3.4.4.3 Timer T1 (End of RTP media) expired . 55
6.3.4.4.4 Timer T2 (Stop talking) expired . 55
6.3.4.4.5 Receive RTP media packets (R: RTP media) . 55
6.3.4.4.6 Receive Floor Release message (R: Floor Release) . 56
6.3.4.4.7 Receive Floor Request message with pre-emptive priority (R: pre-emptive Floor Request) . 56
6.3.4.4.8 Receive Floor request message from permitted floor participant (R: Floor Request) . 57
6.3.4.4.9 Timer T20 (Floor Granted) expired . 57
6.3.4.4.10 Timer T20 (Floor Granted) expired N times . 57
6.3.4.4.11 Permitted MCPTT client release (R: client release) . 57
6.3.4.4.12 Receive an implicit floor request (R: Implicit floor request) . 57
6.3.4.5 State: 'G: pending Floor Revoke' . 58
6.3.4.5.1 General . 58
6.3.4.5.2 Enter the 'G: pending Floor Revoke' state . 58
6.3.4.5.3 Receive RTP media packets (R: RTP media) . 58
6.3.4.5.4 Receive Floor Release message (R: Floor Release) . 58
6.3.4.5.5 Timer T3 (Stop talking grace) expired . 59
6.3.4.5.6 Timer T1 (End of RTP media) expired . 59
6.3.4.6 In any state . 59
6.3.4.6.1 General . 59
6.3.4.6.2 Receive MCPTT call release - 1 . 59
6.3.4.6.3 Receive an instruction to merge group calls (R: Merge) . 59
6.3.4.7 State: 'Releasing' . 59
6.3.4.7.1 General . 59
6.3.4.7.2 Receive MCPTT call release - 2 . 59
6.3.4.8 State: 'G: Floor Initialising' . 60
6.3.4.8.1 General . 60
6.3.4.8.2 Enter the 'G: Initialising' state . 60
6.3.4.8.3 Receiving a floor request from a constituent MCPTT group (R: mcptt-floor-request) . 60
6.3.4.8.4 All final SIP responses received (R: final SIP responses) . 60
6.3.5 Floor control server state transition diagram for basic floor control operation towards the floor
participant . 61
6.3.5.1 General . 61
6.3.5.2 State: 'Start-stop' . 63
6.3.5.2.1 General . 63
ETSI
3GPP TS 24.380 version 14.12.0 Release 14 6 ETSI TS 124 380 V14.12.0 (2022-01)
6.3.5.2.2 SIP Session initiated . 63
6.3.5.3 State: 'U: not permitted and Floor Idle' . 67
6.3.5.3.1 General . 67
6.3.5.3.2 Enter state 'U: not permitted and Floor Idle' . 67
6.3.5.3.3 Send Floor Taken message (S: Floor Taken) . 67
6.3.5.3.4 Receive Floor Request message (R: Floor Request) . 67
6.3.5.3.5 Send Floor Grant message (S: Floor Grant) . 68
6.3.5.3.6 Send Floor Deny message (S: Floor Deny) . 68
6.3.5.3.7 Receive Floor Release message (R: Floor Release) . 68
6.3.5.3.8 Receive RTP media packets (R: media) . 69
6.3.5.3.9 Receive an implicit floor request (R: Implicit floor request) . 69
6.3.5.3.10 Send Floor Idle message (S: Floor Idle) . 69
6.3.5.4 State 'U: not permitted and Floor Taken' . 69
6.3.5.4.1 General . 69
6.3.5.4.2 Enter state 'U: not permitted and Floor Taken' . 70
6.3.5.4.3 Send Floor Idle message (S: Floor Idle) . 70
6.3.5.4.4 Receive Floor Request message (R: Floor Request) . 70
6.3.5.4.5 Receive Floor Release message (R: Floor Release) . 73
6.3.5.4.6 Receive RTP media packets (R: media) . 74
6.3.5.4.7 Send Floor Queue Position Info message (R: Floor Queue Position Request) . 75
6.3.5.4.8 Receive an implicit floor request (R: Implicit floor request) . 75
6.3.5.4.9 Send Floor Granted message (S: Floor Granted) . 75
6.3.5.4.10 Send Floor Taken message (S: Floor Taken) . 76
6.3.5.5 State: 'U: permitted' . 76
6.3.5.5.1 General . 76
6.3.5.5.2 Enter state 'U: permitted' . 76
6.3.5.5.3 Receive Floor Release message (R: Floor Release) . 76
6.3.5.5.4 Send Floor Idle message (S: Floor Idle) . 77
6.3.5.5.5 Send Floor Revoke message (S: Floor Revoke) . 77
6.3.5.5.6 Receive RTP media packets (R: media) . 77
6.3.5.5.7 Receive Floor Request message (R: Floor Request) . 78
6.3.5.5.8 Send RTP Media (S: media) . 78
6.3.5.5.9 Send Floor Taken message (S: Floor Taken) . 78
6.3.5.6 State: 'U: pending Floor Revoke' . 78
6.3.5.6.1 General . 78
6.3.5.6.2 Enter state 'U pending Floor Revoke' . 78
6.3.5.6.3 Timer T8 (media Revoke) expired . 79
6.3.5.6.4 Receive RTP media packets (R: media) . 79
6.3.5.6.5 Receive Floor Release message (R: Floor Release) . 79
6.3.5.6.6 Send Floor Idle message (S: Floor Idle) . 80
6.3.5.6.7 Send Floor Taken message (S: Floor Idle) . 80
6.3.5.7 State 'U: not permitted but sends media' . 80
6.3.5.7.1 General . 80
6.3.5.7.2 Enter state 'U: not permitted but sends media' . 80
6.3.5.7.3 Timer T8 (Floor Revoke) expired. 81
6.3.5.7.4 Receive Floor Release message (R: Floor Release) . 81
6.3.5.8 In any state . 82
6.3.5.8.1 General . 82
6.3.5.8.2 Receive MCPTT call release – 1 . 82
6.3.5.8.3 Receiving a merging instruction (R: Merge) . 82
6.3.5.9 State: 'Releasing' . 82
6.3.5.9.1 General . 82
6.3.5.9.2 Receive MCPTT call release - 2 . 83
6.3.5.10 State: 'U: not permitted and initiating' . 83
6.3.5.10.1 General . 83
6.3.5.10.2 Enter the 'U: not permitted and initiating' state . 83
6.3.5.10.3 Send Floor Taken message (S: Floor Taken) . 83
6.3.5.10.4 Send Floor Idle message (S: Floor Idle) . 83
6.3.5.10.5 Receive Floor Request message (R: Floor Request) . 83
6.3.5.10.6 Send Floor Granted message (S: Floor Granted) . 84
6.3.5.10.7 Receive a Floor Release message (S: Floor Release) . 84
6.3.6 Dual floor control . 85
ETSI
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6.3.6.1 General . 85
6.3.6.2 State: 'Start-stop' . 86
6.3.6.2.1 General . 86
6.3.6.2.2 Receive Floor Request message with overriding pre-emptive floor priority (R: Floor Request) . 86
6.3.6.3 State: 'D: Floor Taken' . 86
6.3.6.3.1 General . 86
6.3.6.3.2 Enter state 'D: Floor Taken' . 86
6.3.6.3.3 Timer T11 (End of RTP dual) expired . 87
6.3.6.3.4 Timer T12 (Stop talking dual) expired . 88
6.3.6.3.5 Receive RTP media packets (R: media) . 89
6.3.6.3.6 Receive Floor Release message (R: Floor Release) . 89
6.3.6.3.7 Receive Floor request message from permitted floor participant (R: Floor Request) . 90
6.3.6.3.8 Permitted MCPTT client release . 90
6.3.6.3.9 Receive Terminate (Terminate) . 91
6.3.6.4 In any state . 91
6.3.6.4.1 General . 91
6.3.6.4.2 Receive MCPTT call release - 1 . 91
6.3.6.5 State: 'Releasing' .
...