ETSI TS 123 281 V18.12.0 (2026-02)

LTE; Functional architecture and information flows to support Mission Critical Video (MCVideo); Stage 2 (3GPP TS 23.281 version 18.12.0 Release 18)

RTS/TSGS-0623281vic0

General Information

• Status: Not Published
• Technical Committee: 3GPP SA 6 - Mission-critical applications
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Completion Date: 12-Feb-2026

Standards Content (Sample)

TECHNICAL SPECIFICATION
LTE;
Functional architecture and information flows to support
Mission Critical Video (MCVideo);
Stage 2
(3GPP TS 23.281 version 18.12.0 Release 18)

3GPP TS 23.281 version 18.12.0 Release 18 1 ETSI TS 123 281 V18.12.0 (2026-02)

Reference
RTS/TSGS-0623281vic0
Keywords
LTE
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ETSI
3GPP TS 23.281 version 18.12.0 Release 18 2 ETSI TS 123 281 V18.12.0 (2026-02)
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ETSI
3GPP TS 23.281 version 18.12.0 Release 18 3 ETSI TS 123 281 V18.12.0 (2026-02)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 11
1 Scope . 12
2 References . 12
3 Definitions, symbols and abbreviations . 13
3.1 Definitions . 13
3.2 Symbols . 14
3.3 Abbreviations . 14
4 Introduction . 14
5 Architectural requirements . 14
5.1 Media routing requirements . 14
5.2 MCVideo group affiliation and MCVideo group de-affiliation . 15
5.3 Device inventory requirements . 15
5.4 Device discovery requirements (off-network) . 15
5.5 Bearer management . 15
5.5.1 General . 15
5.5.2 EPS bearer considerations . 15
5.5.3 EPS unicast bearer considerations for MCVideo . 15
5.5.4 MBMS bearer management . 16
5A Involved business relationships . 16
6 MCVideo Functional model . 16
6.1 Functional model description . 16
6.1.1 On-network functional model . 16
6.1.2 Off-network functional model . 17
6.2 Functional entities description . 18
6.2.1 General . 18
6.2.2 MCVideo service application plane . 18
6.2.2.1 General . 18
6.2.2.2 Common services core . 18
6.2.2.3 MCVideo application service . 18
6.2.2.3.1 MCVideo client . 18
6.2.2.3.2 MCVideo server . 18
6.2.2.3.3 Media distribution function . 19
6.2.2.3.4 Media mixer . 19
6.2.2.3.5 MCVideo user database . 19
6.2.2.3.6 Transmission control server . 19
6.2.2.3.7 Transmission control participant . 19
6.2.2.3.8 MC gateway server . 20
6.3 Reference points . 20
6.3.1 Reference point MCVideo-1 (between the MCVideo client and the MCVideo server) . 20
6.3.2 Reference point MCVideo-2 (between the MCVideo server and the MCVideo user database) . 20
6.3.3 Reference point MCVideo-3 (between the MCVideo server and the MCVideo server and between
the MCVideo server and the MC gateway server) . 20
6.3.4 Reference point MCVideo-4 (between the transmission control participant and the transmission
control server) . 20
6.3.4A Reference point MCVideo-5 (between the MCVideo server and the EPS) . 20
6.3.4B Reference point MCVideo-6 (between the MCVideo server and the EPS) . 21
6.3.5 Reference point MCVideo-7 (between the media distribution function and the media mixer) . 21
6.3.6 Reference point MCVideo-8 (between the media distribution function and the media mixer) . 21
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6.3.7 Reference point MCVideo-9 (between the transmission control participant and the transmission
control server) . 21
6.3.8 Reference point MCVideo-10 (between the MC gateway server and the MC gateway server in a
different MCVideo system) . 21
6A Identities . 21
6B Application of functional model to deployments . 21
7 Procedures and information flows . 22
7.1 Group call . 22
7.1.1 General . 22
7.1.2 On-network group call . 22
7.1.2.1 General . 22
7.1.2.2 Information flows for group call in on-network . 22
7.1.2.2.1 Group call request (MCVideo client – MCVideo server) . 22
7.1.2.2.2 Group call request. 22
7.1.2.2.3 Group call response . 23
7.1.2.2.4 Group call response (MCVideo client – MCVideo server) . 23
7.1.2.2.5 Group call release request. 23
7.1.2.2.6 Group call release request (MCVideo client – MCVideo server) . 24
7.1.2.2.7 Group call release response . 24
7.1.2.2.8 Group call rejoin request . 24
7.1.2.2.9 Group call rejoin response . 25
7.1.2.2.10 Group join request . 25
7.1.2.2.11 Group join response . 25
7.1.2.2.12 Group call leave request . 25
7.1.2.2.12a Group call leave request . 26
7.1.2.2.13 Group call leave response . 26
7.1.2.2.13a Group call leave response . 26
7.1.2.2.14 Void . 27
7.1.2.2.15 Void . 27
7.1.2.2.16 Void . 27
7.1.2.2.17 Void . 27
7.1.2.2.18 MCVideo emergency group call request . 27
7.1.2.2.19 MCVideo emergency group call response . 27
7.1.2.2.20 MCVideo in-progress emergency group state cancel request . 27
7.1.2.2.21 MCVideo in-progress emergency group state cancel response . 28
7.1.2.2.22 MCVideo imminent peril group call request . 28
7.1.2.2.23 MCVideo imminent peril group call response . 28
7.1.2.2.24 MCVideo imminent peril group call cancel request . 29
7.1.2.2.25 MCVideo imminent peril group call cancel response. 29
7.1.2.3 Group call within one MC system . 29
7.1.2.3.1 Group call models. 29
7.1.2.3.1.1 Pre-arranged group call . 29
7.1.2.3.1.2 Chat group call . 34
7.1.2.3.2 Exiting group call due to de-affiliation . 40
7.1.2.3.3 MCVideo user leaving a group call . 41
7.1.2.4 Broadcast group call . 42
7.1.2.4.1 General . 42
7.1.2.4.2 Common broadcast group call procedure . 42
7.1.2.5 Emergency and imminent peril procedures . 43
7.1.2.5.1 MCVideo emergency group call . 43
7.1.2.5.1.1 MCVideo emergency group call commencement . 43
7.1.2.5.1.2 MCVideo group call upgraded to an MCVideo emergency group call . 45
7.1.2.5.1.3 MCVideo in-progress emergency group state cancel . 47
7.1.2.5.2 MCVideo imminent peril group call. 49
7.1.2.5.2.1 MCVideo imminent peril group call commencement . 49
7.1.2.5.2.2 Imminent peril group call upgrade . 51
7.1.2.5.2.3 MCVideo imminent peril group call cancel . 53
7.1.2.6 MCVideo emergency alert (on-network and off-network). 54
7.1.2.7 MCVideo ad hoc group emergency alert (on-network). 54
7.1.3 Off-network group communications . 54
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7.1.3.1 General . 54
7.1.3.2 Information flows for off-network group communications . 55
7.1.3.2.1 Group communication announcement . 55
7.1.3.2.2 Group communication answer response . 55
7.1.3.2.3 MCVideo upgrade to emergency group communication . 56
7.1.3.2.4 MCVideo emergency group communication cancel. 56
7.1.3.2.5 MCVideo upgrade to imminent peril group communication . 56
7.1.3.2.6 MCVideo imminent peril group communication cancel . 56
7.1.3.2.7 MCVideo emergency alert announcement . 57
7.1.3.2.8 MCVideo emergency alert cancel announcement . 57
7.1.3.3 Group communication setup . 57
7.1.3.3.1 General . 57
7.1.3.3.2 Procedure . 57
7.1.3.4 Passive join to group communication . 59
7.1.3.4.1 General . 59
7.1.3.4.2 Procedure . 59
7.1.3.5 Active join to group communication . 60
7.1.3.5.1 General . 60
7.1.3.5.2 Procedure . 60
7.1.3.6 Broadcast group communication . 61
7.1.3.7 Group communication release due to inactivity . 62
7.1.3.8 Emergency and imminent peril procedures . 62
7.1.3.8.1 Emergency group communication . 62
7.1.3.8.2 MCVideo imminent peril. 63
7.1.3.9 MCVideo emergency alert . 64
7.1.3.9.1 General . 64
7.2 Private call . 64
7.2.1 General . 64
7.2.2 Private call on-network . 64
7.2.2.1 General . 64
7.2.2.2 Information flows for private call in on-network . 64
7.2.2.2.1 MCVideo private call request (MCVideo client – MCVideo server) . 64
7.2.2.2.2 MCVideo private call request . 65
7.2.2.2.3 MCVideo private call response (MCVideo client – MCVideo server). 66
7.2.2.2.4 MCVideo private call response . 66
7.2.2.2.5 MCVideo call end request . 67
7.2.2.2.6 MCVideo emergency private call request (MCVideo client to MCVideo server) . 67
7.2.2.2.7 MCVideo emergency private call request . 68
7.2.2.2.8 Emergency MCVideo private call response (MCVideo client – MCVideo server) . 68
7.2.2.2.9 Emergency MCVideo private call response . 68
7.2.2.2.10 MCVideo progress indication . 69
7.2.2.2.11 MCVideo functional alias resolution response . 69
7.2.2.3 Private call within one MC system . 69
7.2.2.3.1 Private call setup in automatic commencement mode . 69
7.2.2.3.2 Private call setup in manual commencement mode . 71
7.2.2.3.2.1 Description . 71
7.2.2.3.2.2 Procedure . 71
7.2.2.3.3 Private call release . 73
7.2.2.3.3.1 Client initiated. 73
7.2.2.3.3.2 Server initiated . 74
7.2.2.4 MCVideo emergency private call . 75
7.2.2.4.1 MCVideo emergency private call commencement . 75
7.2.2.4.2 MCVideo private call emergency upgrade . 77
7.2.3 Off-network private communications . 78
7.2.3.1 General . 78
7.2.3.2 Information flows for off-network private communications . 78
7.2.3.2.1 Private communication request . 78
7.2.3.2.2 Private communication answer response . 79
7.2.3.2.3 Private communication release request. 79
7.2.3.2.4 Private communication release response . 79
7.2.3.3 Use of ProSe for off-network private communications . 80
7.2.3.4 Automatic commencement private communication . 80
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7.2.3.4.1 General . 80
7.2.3.4.2 Procedure . 80
7.2.3.5 Manual commencement private communication . 82
7.2.3.5.1 General . 82
7.2.3.5.2 Procedure – Communication accepted . 82
7.2.3.5.3 Procedure – Communication rejected/ignored . 84
7.2.3.6 Private communication release . 85
7.2.3.6.1 General . 85
7.2.3.6.2 Procedure . 85
7.3 Video pull . 86
7.3.1 General . 86
7.3.2 On-network video pull . 86
7.3.2.1 General . 86
7.3.2.2 Information flows for on-network video pull . 86
7.3.2.2.1 MCVideo pull from server request . 87
7.3.2.2.2 MCVideo pull from server response . 87
7.3.2.2.3 MCVideo pull from server complete request . 87
7.3.2.2.4 MCVideo pull from server complete response . 87
7.3.2.3 One-to-one video pull . 88
7.3.2.3.1 General . 88
7.3.2.3.2 One-to-one video pull – call setup . 88
7.3.2.3.3 One-to-one video pull – call release . 89
7.3.2.4 One-from-server video pull . 89
7.3.2.4.1 General . 89
7.3.2.4.2 Procedure . 89
7.3.3 Off-network video pull . 90
7.3.3.1 General . 90
7.3.3.2 Information flows for off-network video pull . 91
7.3.3.3 Video pull to self . 91
7.3.3.3.1 General . 91
7.3.3.3.2 Procedure . 91
7.4 Video push. 93
7.4.1 General . 93
7.4.2 On-network video push . 93
7.4.2.1 General . 93
7.4.2.2 Information flows for on-network video push. 93
7.4.2.2.1 Remote video push request . 93
7.4.2.2.2 Remote video push response . 94
7.4.2.2.3 Remote video push release request . 94
7.4.2.2.4 MCVideo push to server request . 95
7.4.2.2.5 MCVideo push to server response . 95
7.4.2.2.6 MCVideo push to server complete request . 95
7.4.2.2.7 MCVideo push to server complete response . 96
7.4.2.3 One-to-one video push . 96
7.4.2.3.1 General . 96
7.4.2.3.2 One-to-one video push – call setup . 96
7.4.2.3.3 One-to-one video push – call release . 97
7.4.2.4 One-to-server video push . 97
7.4.2.4.1 General . 97
7.4.2.4.2 Procedure . 97
7.4.2.5 Remotely initiated video push . 99
7.4.2.5.1 General . 99
7.4.2.5.2 Remotely initiated video push – call setup . 99
7.4.2.5.3 Remotely initiated video push – call release by authorized user . 100
7.4.2.6 Remotely initiated video push to group . 101
7.4.2.6.1 General . 101
7.4.2.6.2 Remotely initiated video push to group – call setup . 101
7.4.2.6.3 Remotely initiated video push to group – call release by authorized user . 102
7.4.3 Off-network video push . 103
7.4.3.1 General . 103
7.4.3.2 Information flows for off-network video push . 103
7.4.3.2.1 Remote video push request . 103
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7.4.3.2.2 Video push trying response . 103
7.4.3.2.3 Notification of video push . 103
7.4.3.3 Video push to another MCVideo user . 104
7.4.3.3.1 General . 104
7.4.3.3.2 Procedure . 104
7.4.3.4 Remotely initiated video push . 105
7.4.3.4.1 General . 105
7.4.3.4.2 Procedure . 105
7.4.3.5 Remotely initiated video push to a group . 107
7.4.3.5.1 General . 107
7.4.3.5.2 Procedure . 107
7.5 Capability information sharing . 108
7.5.1 General . 108
7.5.2 On-network capability information sharing . 108
7.5.2.1 General . 108
7.5.2.2 Information flows for on-network capability information sharing . 108
7.5.2.2.1 Update MCVideo capabilities info request . 108
7.5.2.2.2 Update MCVideo capabilities info response . 109
7.5.2.2.3 Get MCVideo capabilities info request .
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