ETSI TS 124 380 V13.12.0 (2020-10)

ETSI TS 124 380 V13.12.0 (2020-10)
TECHNICAL SPECIFICATION
LTE;
Mission Critical Push To Talk (MCPTT) media plane control;
Protocol specification
(3GPP TS 24.380 version 13.12.0 Release 13)
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3GPP TS 24.380 version 13.12.0 Release 13 1 ETSI TS 124 380 V13.12.0 (2020-10)
Reference
RTS/TSGC-0124380vdc0
Keywords
LTE
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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 ................................................................................................. 20

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 ............................................................................................. 22

4.2.1 Controlling MCPTT function ..................................................................................................................... 22

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

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) ......................................................................... 39

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 ................................................................................... 41

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) ......................................................................... 42

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

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 ................................................................................. 46

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' .................................................................................................................................... 50

6.3.4.2.1 General ............................................................................................................................................ 50

6.3.4.2.2 MCPTT call initialization ................................................................................................................ 50

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 ........................................................................................................... 51

6.3.4.3.3 Receive Floor Request message (R: Floor Request) ....................................................................... 52

6.3.4.3.4 Timer T7 (Floor Idle) expired ......................................................................................................... 52

6.3.4.3.5 Timer T4 (Inactivity) expired .......................................................................................................... 53

6.3.4.3.6 Receive an implicit floor request (R: Implicit floor request) ........................................................... 53

6.3.4.4 State: 'G: Floor Taken' ........................................................................................................................... 53

6.3.4.4.1 General ............................................................................................................................................ 53

6.3.4.4.2 Enter the 'G: Floor Taken' state ....................................................................................................... 54

6.3.4.4.3 Timer T1 (End of RTP media) expired ............................................................................................ 54

6.3.4.4.4 Timer T2 (Stop talking) expired ...................................................................................................... 54

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) ........................................................................ 55

6.3.4.4.7 Receive Floor Request message with pre-emptive priority (R: pre-emptive Floor Request) .......... 55

6.3.4.4.8 Receive Floor request message from permitted floor participant (R: Floor Request) ..................... 56

6.3.4.4.9 Timer T20 (Floor Granted) expired ................................................................................................. 56

6.3.4.4.10 Timer T20 (Floor Granted) expired N times ................................................................................... 56

6.3.4.4.11 Permitted MCPTT client release (R: client release) ........................................................................ 56

6.3.4.4.12 Receive an implicit floor request (R: Implicit floor request) ........................................................... 56

6.3.4.5 State: 'G: pending Floor Revoke' ........................................................................................................... 57

6.3.4.5.1 General ............................................................................................................................................ 57

6.3.4.5.2 Enter the 'G: pending Floor Revoke' state ....................................................................................... 57

6.3.4.5.3 Receive RTP media packets (R: RTP media) .................................................................................. 57

6.3.4.5.4 Receive Floor Release message (R: Floor Release) ........................................................................ 58

6.3.4.5.5 Timer T3 (Stop talking grace) expired ............................................................................................ 58

6.3.4.5.6 Timer T1 (End of RTP media) expired ............................................................................................ 58

6.3.4.6 In any state ............................................................................................................................................ 58

6.3.4.6.1 General ............................................................................................................................................ 58

6.3.4.6.2 Receive MCPTT call release - 1 ...................................................................................................... 58

6.3.4.6.3 Receive an instruction to merge group calls (R: Merge) ................................................................. 58

6.3.4.7 State: 'Releasing' ................................................................................................................................... 58

6.3.4.7.1 General ............................................................................................................................................ 58

6.3.4.7.2 Receive MCPTT call release - 2 .........................................................