ETSI TS 103 269-2 V1.2.1 (2017-06)

TECHNICAL SPECIFICATION
TETRA and Critical Communications Evolution (TCCE);
Critical Communications Architecture;
Part 2: Critical Communications application
mobile to network interface architecture

2 ETSI TS 103 269-2 V1.2.1 (2017-06)

Reference
RTS/TCCE-04191
Keywords
broadband, radio, security, TETRA
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the
print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© European Telecommunications Standards Institute 2017.
All rights reserved.
TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M logo is protected for the benefit of its Members
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI
3 ETSI TS 103 269-2 V1.2.1 (2017-06)
Contents
Intellectual Property Rights . 8
Foreword . 8
Modal verbs terminology . 8
1 Scope . 9
2 References . 9
2.1 Normative references . 9
2.2 Informative references . 10
3 Definitions and abbreviations . 11
3.1 Definitions . 11
3.2 Abbreviations . 13
4 Architecture overview . 15
4.1 Architecture reference . 15
4.2 Configurations . 16
4.2.0 Functional Architecture . 16
4.2.1 Single CCA system . 17
4.2.2 Multi-CCAS system . 18
4.2.3 Interconnection with legacy . 19
5 Components . 19
5.0 Functional groups . 19
5.1 Mobile unit . 19
5.2 Access sub-systems . 19
5.3 Critical Communication Application. 19
5.3.0 General . 19
5.3.1 Access interfaces . 20
5.3.1.0 General . 20
5.3.1.1 Application control interface . 20
5.3.1.2 Media unicast interface . 21
5.3.1.3 Media multicast interface . 21
5.3.1.4 Unicast bearer control interface . 21
5.3.1.5 Multicast bearer control interface . 21
5.4 CCAS functional entities . 22
5.4.0 General . 22
5.4.1 SIP application server . 22
5.4.2 Mobility management . 22
5.4.3 Group management . 22
5.4.4 Resource management . 22
5.4.5 Control server . 23
5.4.6 Media distribution . 23
5.4.7 Security . 23
5.4.8 Identity management. 23
6 Reference points, identities and protocols . 23
6.0 Reference points . 23
6.1 Identities and protocols . 24
6.1.0 CCA User identities . 24
6.1.1 CCA application identities . 25
6.1.2 Transport protocols . 26
6.1.2.0 Protocol layers . 26
6.1.2.1 Unicast transport . 27
6.1.2.2 Multicast transport . 27
6.1.2.3 Control of unicast/broadcast transport over LTE . 27
6.1.3 Network layer protocols . 28
6.1.4 Application layer protocols . 28
6.1.4.0 Keep alive . 28
ETSI
4 ETSI TS 103 269-2 V1.2.1 (2017-06)
6.1.4.1 Pseudo-broadcast protocol . 28
6.1.4.2 Group information exchange . 28
6.1.4.3 Priority information requests . 28
6.1.4.4 Profile and CCA service parameter management . 29
6.2 Standardized application codecs . 29
6.2.1 Voice Codec. 29
6.2.2 Video Codec . 29
7 Overview of services . 29
7.0 Introduction . 29
7.1 CCA system access . 29
7.2 Service registration . 30
7.2.0 Initial authentication procedure . 30
7.2.0.1 General . 30
7.2.0.2 Authentication . 32
7.2.1 Home network registration . 33
7.2.2 Migration registration . 34
7.2.3 SIP registration and access procedure . 35
7.2.3.1 General . 35
7.2.3.2 Preparation for SIP registration - the access procedure . 35
7.2.3.3 SIP registration of the CCA client . 38
7.2.3.4 SIP registration of users . 38
7.2.3.5 Identities used for SIP registration . 39
7.2.3.6 Device class and device capabilities . 39
7.2.3.7 Subscription to event services . 39
7.2.3.8 Service parameters, profiles and security parameters . 40
7.2.3.9 Group affiliations and media paths . 41
7.2.4 Periodic update . 41
7.2.5 Deregistration . 42
7.2.6 Remote deregistration . 42
7.3 Individual streaming communication . 42
7.3.0 General . 42
7.3.0.1 The individual communication process . 42
7.3.0.2 Media control protocol for individual calls . 43
7.3.0.3 Individual call states . 44
7.3.1 Individual unit to unit call with on/off hook signalling . 45
7.3.2 Individual unit to unit call with direct signalling . 46
7.3.3 Individual unit to telephony call (outgoing call) . 47
7.3.4 Individual unit to telephony call (incoming call) . 49
7.4 Group streaming communication . 51
7.4.0 General . 51
7.4.0.1 The Group communication process . 51
7.4.0.2 Media control protocol for group calls . 52
7.4.0.3 Group call states . 53
7.4.0.4 E-MBMS use. 54
7.4.1 Broadcast and system call . 54
7.4.2 Group communication coverage . 55
7.4.3 Group provisioning . 55
7.4.4 Group affiliation, mobility and selection . 56
7.4.4.0 Group affiliation . 56
7.4.4.1 Relation between group affiliation and mobility . 57
7.4.4a Group selection . 57
7.4.5 Session join and call start . 57
7.4.6 Late entry . 58
7.4.7 Message exchanges related to group call . 58
7.4.7.1 Group subscription and affiliation . 58
7.4.7.2 Joining a session . 59
7.4.7.3 Non-acknowledged group communication . 60
7.4.7.3.0 Call setup sequence for group communication . 60
7.4.7.3.1 Group call combined with session join . 60
7.4.7.3.2 Group call in pre-joined session . 64
7.4.7.4 Acknowledged or ringing group communication . 65
ETSI
5 ETSI TS 103 269-2 V1.2.1 (2017-06)
7.4.7.5 Bearer control . 67
7.4.8 Conversion of an ongoing group call into an emergency group call . 67
7.5 Push-to-talk management procedures . 67
7.5.0 General . 67
7.5.1 Initial allocation of right to transmit . 67
7.5.2 Releasing the right to transmit . 67
7.5.3 Requesting the right to transmit . 68
7.5.4 Interrupting a granted transmission. 68
7.5.5 Suspending a transmission . 70
7.5.6 End of call . 71
7.6 Call modification . 71
7.7 Management of priority and pre-emption . 72
7.7.0 General . 72
7.7.1 Provisioned priority . 72
7.7.2 Setup priority . 72
7.7.3 Push-to-talk priority . 73
7.7.4 Scanning priority . 73
7.7.5 Resource allocation priority and resource retention . 73
7.7.6 Priority attributes requests . 73
7.8 Status and messaging. 73
7.8.0 Supported status and messaging types . 73
7.8.1 Standard defined status . 74
7.8.1.0 Pre-defined status . 74
7.8.1.1 Emergency status . 74
7.8.1.2 Call alert . 74
7.8.1.3 Urgent call back . 74
7.8.1.4 Ambience listening call request . 74
7.8.1.5 Ambience listening urgent call request . 75
7.8.1.6 Scanning on and off . 75
7.8.1.7 Transmit inhibit on and off . 75
7.8.1.8 Imminent peril status . 75
7.8.2 Messaging . 75
7.8.2.0 Message service . 75
7.8.2.1 Message broadcast . 76
7.9 Presence . 76
7.10 Localization and geographic information . 76
7.10.0 General . 76
7.10.1 Mode of transmission. 77
7.10.2 Assisted location . 78
7.11 Supplementary services . 78
7.11.0 Introduction. 78
7.11.1 Ambience Listening . 78
7.11.2 Talking party and calling party identity . 78
7.11.3 Dynamic group number allocation and group merging . 79
7.11.4 Disabling and enabling . 79
7.11.5 Call forwarding . 80
7.11.5.0 Call redirection . 80
7.11.5.1 Call forwarding unconditional . 80
7.11.5.2 Call forwarding on busy subscriber and on no reply . 80
7.11.6 Call barring . 80
7.11.6.0 Introduction . 80
7.11.6.1 Barring of outgoing calls . 80
7.11.6.2 Barring of incoming calls . 81
7.11.7 Call waiting and call hold . 81
7.11.8 Discreet listening . 81
7.11.9 Call transfer . 81
7.11.10 Area restriction . 81
7.11.11 Tracing & Recording . 81
7.11.12 Remotely triggered call . 82
7.11.13 Over-the-air configuration . 82
7.12 Principles for mobility management . 82
7.12.1 Roaming and Migration . 82
ETSI
6 ETSI TS 103 269-2 V1.2.1 (2017-06)
7.12.2 Media gateway re-allocation . 83
8 Multiple User Instances . 83
8.1 User Instances . 83
8.2 List identifiers . 83
8.3 Use of multiple MUs . 84
8.4 Multiple users of one device. 84
8.5 Participant types . 84
9 Profiles and Service Parameters . 84
9.1 General . 84
9.2 User Profiles . 85
9.3 Supplementary Configuration . 89
9.4 Group Profiles . 89
9.4.1 General . 89
9.4.2 Group profile items provided to group members . 89
9.4.3 Group profile items not normally provided to group members. 91
9.5 Device Profiles . 91
9.5.1 General . 91
9.5.2 Device profile items provided to the MU . 92
9.5.3 Device profile items not normally provided to the MU . 92
9.6 CCA Service parameters . 93
9.6.1 Service parameters provided to the MU . 93
9.6.2 Service Parameters not provided to the MU . 93
9.7 MU configuration data . 94
Annex A (informative): Analysed services and requirements . 96
Annex B (normative): Media control protocol . 104
B.1 General . 104
B.2 Media Control Protocol message table . 104
History . 107

ETSI
7 ETSI TS 103 269-2 V1.2.1 (2017-06)
Figures
Figure 1: CCS Reference Model .16
Figure 2: Functional architecture.17
Figure 3: Multi-CCAS system .18
Figure 4: Reference points .24
Figure 5: MU to CCAS interface, control plane part.26
Figure 6: MU to CCAS interface, media plane unicast part .26
Figure 7: MU to CCAS interface, media plane multicast part.27
Figure 8: Sequence of events in the MU following power up .31
Figure 9: Home registration .34
Figure 10: Migration registration .35
Figure 11: Access procedure .37
Figure 12: Message sequence chart for registration process .40
Figure 13: State-event diagram for individual call .44
Figure 14: Message sequence chart for a successful individual unit-to-unit call setup .46
Figure 15: Message sequence chart for a successful individual unit-to-unit call setup with direct signalling .47
Figure 16: Message sequence chart for outgoing call to an external subscriber.48
Figure 17: Message sequence chart for incoming call from an external subscriber .50
Figure 18: State event diagram for group call .53
Figure 19: Message sequence chart for subscription and affiliation .59
Figure 20: Message sequence chart for joining a session .59
Figure 21: Message sequence chart for infrastructure initiated session join .60
Figure 22: Non-acknowledged group call setup including session join, using unicast bearers .61
Figure 23: Non-acknowledged group call setup with multicast bearer for receiving parties .62
Figure 24: Non-acknowledged group call at session join time with call queuing .63
Figure 25: Non-acknowledged group call setup with pre-joined session .64
Figure 26: Non-acknowledged queued group call setup pre-joined session .65
Figure 27: Acknowledged group call setup with session join .66
Figure 28: Rejection of talking party interruption .68
Figure 29: Processing of a request to transmit without pre-emption .69
Figure 30: Stopping a granted transmission .70

ETSI
8 ETSI TS 103 269-2 V1.2.1 (2017-06)
Intellectual Property Rights
IPRs essential or potentially essential to the present document 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.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee TETRA and Critical
Communications Evolution (TCCE).
The present document is part 2 of a multi-part deliverable covering TETRA and Critical Communications Evolution
(TCCE); Critical Communications Architecture, as identified below:
ETSI TR 103 269-1: "Critical Communications Architecture Reference Model";
ETSI TS 103 269-2: "Critical Communications application mobile to network interface architecture";
ETSI TS 103 269-3: "Critical Communications application mobile to network interface specification".
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
9 ETSI TS 103 269-2 V1.2.1 (2017-06)
1 Scope
The present document presents an overview of the architecture for a generic mission critical service for use by a Critical
Communications Application in network and terminal over a broadband IP bearer, with specific focus for LTE. The
architecture is part of the overall Critical Communications Architecture Reference Model, described in ETSI
TR 103 269-1 [i.11]. The overall architecture and services are described and the implementation of services equivalent
to the existing narrowband technologies, for example those in TETRA and Tetrapol systems. Off network services are
for future study and so are outside the scope of the present document.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] Void.
[2] IETF RFC 3261: "SIP: Session Initiation Protocol".
[3] IETF RFC 5389: "Session Traversal Utilities for NAT (STUN)".
[4] IETF RFC 6665: "SIP-Specific Event Notification".
[5] IETF RFC 3428: "Session Initiation Protocol (SIP) Extension for Instant Messaging".
[6] IETF RFC 3903: "Session Initiation Protocol (SIP) Extension for Event State Publication".
[7] IETF RFC 4566: "SDP: Session Description Protocol".
[8] Void.
[9] IETF RFC 791: "Internet Protocol (v4)".
[10] IETF RFC 2460: "Internet Protocol, Version 6 (IPv6) Specification".
[11] IETF RFC 793: "Transmission Control Protocol".
[12] IETF RFC 4960: "Stream Control Transmission Protocol".
[13] IETF RFC 5246: "The Transport Layer Security (TLS) Protocol Version 1.2".
[14] IETF RFC 6347: "Datagram Transport Layer Security Version 1.2".
[15] IETF RFC 768: "User Datagram Protocol".
[16] IETF RFC 3550: "RTP: A Transport Protocol for Real-Time Applications".
[17] IETF RFC 3711: "The Secure Real-time Transport Protocol (SRTP)".
[18] IETF RFC 5245 (04-2010): "Interactive Connectivity Establishment (ICE): A Protocol for
Network Address Translator (NAT) Traversal for Offer/Answer Protocols".
ETSI
10 ETSI TS 103 269-2 V1.2.1 (2017-06)
[19] IETF RFC 5766: "Traversal Using Relays aroun
...