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TECHNICAL SPECIFICATION
LTE;
Mission Critical Push To Talk (MCPTT) media plane control;
Protocol specification
(3GPP TS 24.380 version 15.5.0 Release 15)
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3GPP TS 24.380 version 15.5.0 Release 15 1 ETSI TS 124 380 V15.5.0 (2019-04)
Reference
RTS/TSGC-0124380vf50
Keywords
LTE
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3GPP TS 24.380 version 15.5.0 Release 15 2 ETSI TS 124 380 V15.5.0 (2019-04)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
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Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
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Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
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3GPP TS 24.380 version 15.5.0 Release 15 3 ETSI TS 124 380 V15.5.0 (2019-04)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 15
1 Scope . 16
2 References . 16
3 Definitions and abbreviations . 17
3.1 Definitions . 17
3.2 Abbreviations . 18
4 General . 19
4.1 Overview . 19
4.1.1 Floor Control . 19
4.1.1.1 General . 19
4.1.1.2 On-network floor control . 19
4.1.1.3 Off-network floor control . 20
4.1.1.4 Determine on-network effective priority . 21
4.1.1.5 Determine off-network effective priority . 21
4.1.2 Pre-established session call control. 22
4.1.2.1 General . 22
4.1.2.2 Call setup over pre-established session . 22
4.1.2.3 Release of a call which uses a pre-established session . 22
4.1.3 MBMS subchannel control . 23
4.1.3.1 General . 23
4.1.3.2 Start of a conversation . 23
4.1.3.3 During a conversation . 23
4.1.3.4 Ending the conversation . 23
4.1.3.5 Starting a call over unicast bearers . 24
4.1.3.6 Moving a conversation to unicast bearers . 24
4.1.3.7 MBMS bearer announcement over an MBMS bearer . 24
4.2 Internal structure of media plane control entities . 24
4.2.1 Controlling MCPTT function . 24
4.2.2 MCPTT client . 26
4.2.3 Participating MCPTT function . 28
4.2.3.1 General . 28
4.2.3.2 Internal structure of the participating MCPTT function . 28
4.2.3.3 The roles of the participating MCPTT function . 29
4.2.3.3.1 For the floor control procedures . 29
4.2.3.3.2 For the call over pre-established session procedures . 29
4.2.3.3.3 For the use of MBMS bearer procedures . 29
4.2.4 Non-controlling MCPTT function of an MCPTT group . 30
4.3 The media plane control channel . 31
4.3.1 General . 31
4.3.2 Control channel realization . 31
4.3.3 Establishing a media plane control channel . 31
4.3.3.1 General . 31
5 Entities . 32
5.1 General . 32
5.2 MCPTT client . 32
5.2.1 Introduction. 32
5.2.2 Floor participant in on-network mode . 33
5.2.3 Floor participant in off-network mode . 33
5.3 Controlling MCPTT function . 33
5.4 Participating MCPTT function . 34
5.5 Non-controlling MCPTT function . 34
ETSI
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3GPP TS 24.380 version 15.5.0 Release 15 4 ETSI TS 124 380 V15.5.0 (2019-04)
6 On-network floor control. 34
6.1 General . 34
6.2 Floor participant procedures . 34
6.2.1 Floor participant procedures at MCPTT session initializatio n . 34
6.2.2 Floor participant procedures at MCPTT call release . 35
6.2.3 Floor participant procedures at MCPTT call modification . 35
6.2.4 Floor participant state transition diagram for basic operation . 35
6.2.4.1 General . 35
6.2.4.2 State: 'Start-stop' . 36
6.2.4.2.1 General . 36
6.2.4.2.2 MCPTT call initiated, originating MCPTT user . 37
6.2.4.2.3 MCPTT call established, terminating MCPTT user . 37
6.2.4.3 State: 'U: has no permission' . 37
6.2.4.3.1 General . 37
6.2.4.3.2 Receive Floor Idle message (R: Floor Idle) . 37
6.2.4.3.3 Receive Floor Taken message (R: Floor Taken) . 38
6.2.4.3.4 Receive RTP media packets (R: RTP media) . 38
6.2.4.3.5 Send Floor Request message (PTT button pressed) . 38
6.2.4.3.6 Timer T103 (End of RTP media) expired . 38
6.2.4.3.7 Receive Floor Release Multi Talker message (R: Floor Release Multi Talker) . 38
6.2.4.4 State: 'U: pending Request' . 39
6.2.4.4.1 General . 39
6.2.4.4.2 Receive Floor Granted message (R: Floor Granted). 39
6.2.4.4.3 Void . 39
6.2.4.4.4 Receive Floor Deny message (R: Floor Deny) . 39
6.2.4.4.5 Timer T101 (Floor request) expired . 40
6.2.4.4.6 Timer T101 (Floor Request) expired N times . 40
6.2.4.4.7 Receive RTP media packets (R: RTP Media) . 40
6.2.4.4.8 Send Floor Release message (PTT button released) . 40
6.2.4.4.9 Receive Floor Queue Position Info message (R: Floor Queue Position Info) . 40
6.2.4.4.10 Receive Floor Release Multi Talker message (R: Floor Release Multi talker) . 41
6.2.4.5 State: 'U: has permission' . 41
6.2.4.5.1 General . 41
6.2.4.5.2 Send RTP media packets (RTP media) . 41
6.2.4.5.3 Send Floor Release message (PTT button released) . 41
6.2.4.5.4 Receive Floor Revoke message (R: Floor Revoke) . 42
6.2.4.5.5 Receive Floor Granted message (R: Floor Granted). 42
6.2.4.5.6 Receive RTP media packets (R: RTP Media) . 42
6.2.4.5.7 Receive Floor Idle message (R: Floor Idle) . 42
6.2.4.5.8 Receive Floor Taken message (R: Floor Taken) . 43
6.2.4.5.9 Receive Floor Release Multi Talker message (R: Floor Release Multi talker) . 43
6.2.4.6 State: 'U: pending Release' . 43
6.2.4.6.1 General . 43
6.2.4.6.2 Timer T100 (Floor Release) expired . 44
6.2.4.6.3 Timer T100 (Floor release) expired N times . 44
6.2.4.6.4 Receive Floor Idle message (R: Floor Idle) . 44
6.2.4.6.5 Receive Floor Taken message (R: Floor Taken) . 44
6.2.4.6.6 Receive RTP media packets (R: RTP Media) . 45
6.2.4.6.7 Receive Floor Revoke message (R: Floor Revoke) . 45
6.2.4.6.8 Receive Floor Granted message (R: Floor Granted). 45
6.2.4.6.9 Receive Floor Release Multi Talker message (R: Floor Release Multi talker) . 45
6.2.4.7 In any state . 45
6.2.4.7.1 General . 45
6.2.4.7.2 Receive MCPTT call release – step 1 (R: MCPTT call release - 1) . 46
6.2.4.7.3 Receive a Floor Control message with a Floor Indicator field (R: Floor Indicator) . 46
6.2.4.8 State: 'Releasing' . 46
6.2.4.8.1 General . 46
6.2.4.8.2 Receive MCPTT call release – step 2 (R: MCPTT call release - 2) . 46
6.2.4.9 State: 'U: queued' . 46
6.2.4.9.1 General . 46
6.2.4.9.2 Receive RTP media packets (R: RTP media) . 46
6.2.4.9.3 Receive Floor Taken message (R: Floor Taken) . 46
ETSI
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3GPP TS 24.380 version 15.5.0 Release 15 5 ETSI TS 124 380 V15.5.0 (2019-04)
6.2.4.9.4 Receive Floor Granted message (R: Floor Granted). 47
6.2.4.9.5 Receive Floor Deny message (R: Floor Deny) . 47
6.2.4.9.6 Send Floor Release message (PTT button released) . 47
6.2.4.9.7 Receive Floor Queue Position Info message (R: Floor Queue Position Info) . 48
6.2.4.9.8 Receive Floor Idle message (R: Floor Idle) . 48
6.2.4.9.9 Send Floor Queue Position Request message (S: Floor Queue Position Request) . 48
6.2.4.9.10 Timer T104 (Floor Queue Position Request) expired. 48
6.2.4.9.11 Timer T104 (Floor Queue Position Request) expired N times . 49
6.2.4.9.12 User indication for accept of pending request . 49
6.2.4.9.13 Timer T132 (Queued granted user action) expires . 49
6.2.4.9.14 Receive Floor Release Multi Talker message (R: Floor Release Multi talker) . 49
6.3 Floor control server procedures . 49
6.3.1 General . 49
6.3.2 Controlling MCPTT function procedures at MCPTT call initialization . 50
6.3.2.1 General . 50
6.3.2.2 Initial procedures . 50
6.3.2.3 Switching from a non-controlling MCPTT function mode to a controlling MCPTT function
mode . 51
6.3.3 MCPTT floor control procedures at MCPTT call release . 51
6.3.4 Floor control server state transition diagram for general floor control operation . 51
6.3.4.1 General . 51
6.3.4.2 State: 'Start-stop' . 53
6.3.4.2.1 General . 53
6.3.4.2.2 MCPTT call initialization . 53
6.3.4.3 State: 'G: Floor Idle' . 53
6.3.4.3.1 General . 53
6.3.4.3.2 Enter the 'G: Floor Idle' state . 54
6.3.4.3.3 Receive Floor Request message (R: Floor Request) . 55
6.3.4.3.4 Timer T7 (Floor Idle) expired . 55
6.3.4.3.5 Timer T4 (Inactivity) expired . 55
6.3.4.3.6 Receive an implicit floor request (R: Implicit floor request) . 56
6.3.4.4 State: 'G: Floor Taken' . 56
6.3.4.4.1 General . 56
6.3.4.4.2 Enter the 'G: Floor Taken' state . 56
6.3.4.4.3 Timer T1 (End of RTP media) expired . 57
6.3.4.4.4 Timer T2 (Stop talking) expired . 58
6.3.4.4.5 Receive RTP media packets (R: RTP media) . 58
6.3.4.4.6 Receive Floor Release message (R: Floor Release) . 58
6.3.4.4.7 Receive Floor Request message with pre-emptive priority (R: pre-emptive Floor Request) . 59
6.3.4.4.7a Receive Floor Request message multi-talker (R: multi-talker Floor Request) . 59
6.3.4.4.8 Receive Floor request message from permitted floor participant (R: Floor Request) . 61
6.3.4.4.9 Timer T20 (Floor Granted) expired . 61
6.3.4.4.10 Timer T20 (Floor Granted) expired N times . 61
6.3.4.4.11 Permitted MCPTT client release (R: client release) . 61
6.3.4.4.12 Receive an implicit floor request (R: Implicit floor request) . 62
6.3.4.5 State: 'G: pending Floor Revoke' . 62
6.3.4.5.1 General . 62
6.3.4.5.2 Enter the 'G: pending Floor Revoke' state . 62
6.3.4.5.3 Receive RTP media packets (R: RTP media) . 62
6.3.4.5.4 Receive Floor Release message (R: Floor Release) . 63
6.3.4.5.5 Timer T3 (Stop talking grace) expired .
...