ETSI TS 124 281 V15.6.0 (2019-10)

ETSI TS 124 281 V15.6.0 (2019-10)






TECHNICAL SPECIFICATION
LTE;
Mission Critical Video (MCVideo) signalling control;
Protocol specification
(3GPP TS 24.281 version 15.6.0 Release 15)

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3GPP TS 24.281 version 15.6.0 Release 15 1 ETSI TS 124 281 V15.6.0 (2019-10)



Reference
RTS/TSGC-0124281vf60
Keywords
LTE
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3GPP TS 24.281 version 15.6.0 Release 15 2 ETSI TS 124 281 V15.6.0 (2019-10)
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
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
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not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Legal Notice
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. These shall be
interpreted as being references to the corresponding ETSI deliverables.
The cross reference between 3GPP and ETSI identities can be found under http://webapp.etsi.org/key/queryform.asp.
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 24.281 version 15.6.0 Release 15 3 ETSI TS 124 281 V15.6.0 (2019-10)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 21
1 Scope . 22
2 References . 22
3 Definitions, symbols and abbreviations . 25
3.1 Definitions . 25
3.2 Symbols . 27
3.3 Abbreviations . 27
4 General . 28
4.1 MCVideo overview . 28
4.2 URI and address assignments . 29
4.3 MCVideo media . 29
4.4 Warning header field . 29
4.4.1 General . 29
4.4.2 Warning texts . 29
4.5 MCVideo session identity . 33
4.6 MCVideo priority calls and alerts . 34
4.6.1 MCVideo emergency group calls . 34
4.6.2 MCVideo emergency private calls . 35
4.6.3 MCVideo emergency alerts . 36
4.6.4 MCVideo imminent peril group call . 37
4.7 Communication security . 38
4.7.1 Media security . 38
4.7.2 Signalling security . 39
4.8 Protection of sensitive application data. . 39
4.9 MCVideo client ID . 40
4.10 Off-network MCVideo . 41
5 Functional entities . 41
5.1 General . 41
5.2 MCVideo client . 41
5.3 MCVideo server . 42
5.3.1 General . 42
5.3.2 Functional connectivity models . 43
5.3.3 Failure case . 44
5.4 MCVideo UE-to-network relay . 44
6 Common procedures. 44
6.1 Introduction . 44
6.2 MCVideo client procedures . 45
6.2.0 Distinction of requests at the MCVideo client . 45
6.2.1 SDP offer generation . 45
6.2.2 SDP answer generation . 46
6.2.3 Commencement modes . 47
6.2.3.1 Automatic commencement mode . 47
6.2.3.1.1 Automatic commencement mode for private calls . 47
6.2.3.1.2 Automatic commencement mode for group calls . 48
6.2.3.2 Manual commencement mode . 48
6.2.3.2.1 Manual commencement mode for private calls . 48
6.2.3.2.2 Manual commencement mode for group calls . 48
6.2.4 Leaving an MCVideo session initiated by MCVideo client . 49
6.2.4.1 On-demand session case . 49
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3GPP TS 24.281 version 15.6.0 Release 15 4 ETSI TS 124 281 V15.6.0 (2019-10)
6.2.5 Releasing an MCVideo session initiated by MCVideo client . 49
6.2.5.1 On-demand session case . 49
6.2.6 Receiving an MCVideo session release request. 49
6.2.7 Void . 49
6.2.8 Priority call conditions . 49
6.2.8.0 General . 49
6.2.8.1 MCVideo emergency group call conditions . 50
6.2.8.1.1 SIP INVITE request for originating MCVideo emergency group calls . 50
6.2.8.1.2 Resource-Priority header field for MCVideo emergency group calls . 51
6.2.8.1.3 SIP re-INVITE request for cancelling MCVideo in-progress emergency group state. 51
6.2.8.1.4 Receiving a SIP 2xx response to a SIP request for a priority call . 52
6.2.8.1.5 Receiving a SIP 4xx response, SIP 5xx response or SIP 6xx response to a SIP request for a
priority group call . 52
6.2.8.1.6 Determining authorisation for initiating or cancelling an MCVideo emergency alert. 53
6.2.8.1.7 Determining authorisation for cancelling the in-progress emergency state of an MCVideo
group . 53
6.2.8.1.8 Determining authorisation for originating a priority group call . 54
6.2.8.1.9 SIP request for originating MCVideo imminent peril group calls . 54
6.2.8.1.10 Determining authorisation for cancelling an imminent peril group call . 55
6.2.8.1.11 SIP re-INVITE request for cancelling MCVideo in-progress imminent peril group state . 55
6.2.8.1.12 Resource-Priority header field for MCVideo imminent peril group calls . 55
6.2.8.1.13 Receiving a SIP INFO request in the dialog of a SIP request for a priority group call . 56
6.2.8.1.14 SIP re-INVITE request for cancelling the in-progress emergency group state of a group by a
third-party . 57
6.2.8.1.15 Retrieving Resource-Priority header field values . 57
6.2.8.1.16 Resource-priority header field namespaces for MCVideo . 58
6.2.8.1.17 Priority group call conditions upon receiving call release . 58
6.2.8.1.18 Emergency private call conditions upon receiving call release . 58
6.2.8.2 Request for an originating broadcast group call . 58
6.2.8.3 MCVideo emergency private call conditions . 59
6.2.8.3.1 Authorisations . 59
6.2.8.3.1.1 Determining authorisation for initiating an MCVideo emergency private call . 59
6.2.8.3.1.2 Determining authorisation for cancelling an MCVideo emergency private call . 59
6.2.8.3.1.3 Determining authorisation for initiating or cancelling an MCVideo emergency alert to a
MCVideo user . 59
6.2.8.3.2 SIP request for originating MCVideo emergency private calls . 60
6.2.8.3.3 Resource-Priority header field for MCVideo emergency private calls . 60
6.2.8.3.4 Receiving a SIP 2xx response to a SIP request for an MCVideo emergency private call . 61
6.2.8.3.5 Receiving a SIP 4xx response, SIP 5xx response or SIP 6xx response to a SIP request for an
MCVideo emergency private call . 61
6.2.8.3.6 SIP re-INVITE request for cancelling MCVideo emergency private call state . 61
6.2.8.3.7 Receiving a SIP INFO request in the dialog of a SIP request for a priority private call. 62
6.2.8.3.8 SIP re-INVITE request for cancelling the MCVideo emergency private call state by a third-
party . 63
6.2.8.3.9 Retrieving a KMS URI associated with an MCVideo ID . 63
6.2.9 Location information . 64
6.2.9.1 Location information for location reporting . 64
6.3 MCVideo server procedures . 64
6.3.1 Distinction of requests sent to the MCVideo server . 64
6.3.1.1 SIP INVITE request . 64
6.3.1.2 SIP MESSAGE request . 65
6.3.1.3 SIP SUBSCRIBE request . 66
6.3.2 Participating MCVideo Function . 66
6.3.2.1 Requests initiated by the served MCVideo user. 66
6.3.2.1.1 SDP offer generation . 66
6.3.2.1.1.1 On-demand session . 66
6.3.2.1.2 SDP answer generation . 67
6.3.2.1.2.1 On-demand session . 67
6.3.2.1.3 Sending an INVITE request on receipt of an INVITE request . 67
6.3.2.1.4 Response to an INVITE request . 68
6.3.2.1.4.1 Provisional responses . 68
6.3.2.1.4.2 Final response . 68
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3GPP TS 24.281 version 15.6.0 Release 15 5 ETSI TS 124 281 V15.6.0 (2019-10)
6.3.2.1.5 Sending a SIP BYE request on receipt of a SIP BYE request . 69
6.3.2.1.6 Priority call conditions . 69
6.3.2.1.6.0 General . 69
6.3.2.1.6.1 Determining authorisation for originating a priority group call . 69
6.3.2.1.6.2 Determining authorisation for initiating or cancelling an MCVideo emergency alert . 70
6.3.2.1.6.3 Validate priority request parameters . 71
6.3.2.1.6.4 Retrieving Resource-Priority header field values . 71
6.3.2.1.7 Generating a SIP re-INVITE request on receipt of a SIP re-INVITE request . 71
6.3.2.1.8 Sending a SIP INVITE request on receipt of SIP 3xx response . 71
6.3.2.2 Requests terminated to the served MCVideo user . 72
6.3.2.2.1 SDP offer generation . 72
6.3.2.2.2 SDP answer generation . 72
6.3.2.2.2.1 On-demand session . 72
6.3.2.2.3 SIP INVITE request towards the terminating MCVideo client . 72
6.3.2.2.4 Response to a SIP INVITE request . 73
6.3.2.2.4.1 Provisional response . 73
6.3.2.2.4.2 Final response . 73
6.3.2.2.5 Automatic Commencement Mode . 74
6.3.2.2.5.1 General . 74
6.3.2.2.5.2 Automatic commencement for On-Demand session . 74
6.3.2.2.6 Manual Commencement Mode . 75
6.3.2.2.6.1 General . 75
6.3.2.2.6.2 Manual commencement for On-Demand session . 76
6.3.2.2.7 Void . 77
6.3.2.2.8 SIP BYE request towards the terminating MCVideo client . 77
6.3.2.2.8.1 On-demand. 77
6.3.2.2.9 Populate MIME bodies . 77
6.3.2.2.10 Generating a SIP re-INVITE request towards the terminating MCVideo client . 78
6.3.2.2.11 Generating a SIP MESSAGE request towards the terminating MCVideo client . 78
6.3.2.3 Processing I_MESSAGEs containing MKFC and MKFC-ID . 78
6.3.2.3.1 General . 78
6.3.2.3.2 Processing an I_MESSAGE containing MKFC and MKFC-ID . 79
6.3.3 Controlling MCVideo function . 79
6.3.3.1 Request initiated by the controlling MCVideo function . 79
6.3.3.1.1 SDP offer generation . 79
6.3.3.1.2 Sending an INVITE request . 80
6.3.3.1.3 Receipt of a SIP response to a SIP INVITE request . 80
6.3.3.1.3.1 Final response . 80
6.3.3.1.4 Sending a SIP BYE request . 80
6.3.3.1.5 Sending a SIP re-INVITE request for MCVideo emergency group call . 81
6.3.3.1.6 Sending a SIP INVITE request for MCVideo emergency group call . 82
6.3.3.1.7 Sending a SIP UPDATE request for Resource-Priority header field correction. 83
6.3.3.1.8 Generating a SIP re-INVITE request . 84
6.3.3.1.9 Generating a SIP re-INVITE request to cancel an in-progress emergency . 84
6.3.3.1.10 Generating a SIP MESSAGE request for notification of in-progress emergency or imminent
peril status change . 84
6.3.3.1.11 Populate mcvideo-info and location-info MIME bodies for emergency alert . 85
6.3.3.1.12 Authorisations . 85
6.3.3.1.12.1 Determining authorisation for initiating an MCVideo emergency alert . 85
6.3.3.1.12.2 Determining authorisation for initiating an MCVideo emergency group or private call . 86
6.3.3.1.12.3 Determining authorisation for cancelling an MCVideo emergency alert . 87
6.3.3.1.12.4 Determining authorisation for cancelling an MCVideo emergency call . 87
6.3.3.1.12.5 Determining authorisation for initiating an MCVideo imminent peril call . 88
6.3.3.1.12.6 Determining authorisation for cancelling an MCVideo imminent peril call . 88
6.3.3.1.13 Generating a SIP 403 response for priority call request rejection . 89
6.3.3.1.14 Sending a SIP re-INVITE request for MCVideo imminent peril group call . 89
6.3.3.1.15 Handling the expiry of timer TNG2 (in-progress emergency group call timer) . 89
6.3.3.1.16 Validate priority request parameters . 90
6.3.3.1.17 Sending a SIP INFO request in the dialog of a SIP request for a priority call .
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