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TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
Interworking between the IM CN subsystem and IP networks
(3GPP TS 29.162 version 15.0.0 Release 15)
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3GPP TS 29.162 version 15.0.0 Release 15 1 ETSI TS 129 162 V15.0.0 (2018-11)
Reference
RTS/TSGC-0329162vf00
Keywords
GSM,LTE,UMTS
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3GPP TS 29.162 version 15.0.0 Release 15 2 ETSI TS 129 162 V15.0.0 (2018-11)
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
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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
.
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 29.162 version 15.0.0 Release 15 3 ETSI TS 129 162 V15.0.0 (2018-11)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 6
1 Scope . 7
2 References . 7
3 Definitions, symbols and abbreviations . 9
3.1 Definitions . 9
3.2 Symbols . 10
3.3 Abbreviations . 10
4 General . 11
4.1 General interworking overview . 11
4.2 Interworking scenarios . 11
4.2.1 UE with 3GPP SIP profile capability connecting to an external SIP device. 12
5 Network characteristics . 12
5.1 Key characteristics of IP Multimedia Networks . 12
5.2 Key characteristics of UMTS IM CN Subsystem . 12
6 Interworking Reference Model for control plane interworking and user plane interworking . 12
6.0 Reference Model . 12
6.1 Interworking Functional Entities . 13
6.1.1 IBCF . 13
6.1.2 IMS-ALG . 13
6.1.3 TrGW . 13
6.1.4 Acces Transfer Control Function . 14
6.1.5 Acces Transfer GateWay . 14
7 Control plane interworking . 14
7.1 SIP with 3GPP Profile to Standard SIP Interworking . 14
7.2 Additional interworking of protocols associated with services . 14
8 User Plane Interworking . 14
8.1 Overview . 14
8.2 Void . 15
8.3 Void . 15
9 IMS-ALG and TrGW functionality for NAPT and IP Version Interworking . 15
9.1 Control plane interworking. 15
9.1.1 Session Set-up . 15
9.1.1.0 General . 15
9.1.1.1 Receipt of the first SDP offer . 15
9.1.1.2 Receipt of the first SDP answer . 15
9.1.2 Void . 16
9.1.3 Change of connection information . 16
9.1.4 Interworking of SIP messages . 16
9.1.5 Modification of SDP bandwidth information for IP version interworking . 16
9.2 User plane transport. 17
9.2.1 Payload transport . 17
9.2.2 IP header interworking . 17
9.2.2.1 IPv4 to IPv6 . 17
9.2.2.2 Abnormal cases . 19
9.2.2.3 IPv6 to IPv4 . 20
9.2.2.4 Abnormal cases . 21
9.2.3 Fragmentation . 21
9.2.4 Abnormal cases . 22
ETSI
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3GPP TS 29.162 version 15.0.0 Release 15 4 ETSI TS 129 162 V15.0.0 (2018-11)
10 IBCF – TrGW Interactions . 22
10.1 Overview . 22
10.1.1 General . 22
10.1.2 Network model . 22
10.1.3 Example Call Flow . 22
10.1.3.1 Basic Procedures . 22
10.1.3.1.1 Call Establishment . 22
10.1.3.1.2 Call Release . 25
10.2 Main Functions supported at the Ix Interface . 25
10.2.0 Introduction. 25
10.2.1 NAPT and IP version interworking . 26
10.2.2 Gate Management . 26
10.2.3 RTCP Handling . 26
10.2.4 IP Realm Indication . 27
10.2.5 Media Control . 27
10.2.5.1 General . 27
10.2.5.2 Handling of common codec parameters . 34
10.2.5.3 EVS speech codec parameters handling . 34
10.2.5.4 Rate adaptation for media endpoints . 34
10.2.6 Media Inactivity Detection . 35
10.2.7 QoS Packet Marking (differentiated services) . 35
10.2.8 Hanging Termination Detection . 36
10.2.9 Bandwidth Policing. 36
10.2.10 IMS end-to-end media plane security . 36
10.2.10.1 End-to-end security for RTP based media . 36
10.2.10.2 End-to-end security for TCP based media using TLS . 36
10.2.11 Through-Connection . 37
10.2.11.1 General . 37
10.2.11.2 Through-connect control procedures considering the P-Early-Media header field . 37
10.2.12 Emergency Call . 39
10.2.13 Explicit Congestion Notification support . 39
10.2.13.1 General . 39
10.2.13.2 Incoming SDP offer with ECN . 39
10.2.13.3 Incoming SDP offer without ECN . 40
10.2.13.3a Detection of ECN failures by TrGW . 41
10.2.13.4 Interworking with non-3GPP ECN IP terminal. 41
10.2.13.4.1 Support for additional ECN parameters . 41
10.2.13.4.2 Incoming SDP offer from external IP network with ECN . 41
10.2.13.4.3 Incoming SDP offer from the IMS with ECN . 41
10.2.13.5 Message sequence chart . 43
10.2.13.5.1 ECN support requested (ECN endpoint) . 43
10.2.13.5.2 ECN Active Indicated (ECN transparent) . 43
10.2.13.5.3 ECN Failure Indication (ECN endpoint) . 43
10.2.14 Optimal Media Routeing . 44
10.2.15 IP Realm Availability . 44
10.2.16 Access Transfer procedures with media anchored in ATGW . 44
10.2.17 Multimedia Priority Service (MPS) Support . 45
10.2.17.1 General . 45
10.2.17.2 TrGW Resource Congestion in ADD response, request is queued . 45
10.2.17.3 TrGW Resource Congestion in ADD response, IBCF seizes new TrGW. 46
10.2.17.4 TrGW Priority Resource Allocation . 46
10.2.17.5 TrGW Priority User Data marking . 47
10.2.17.6 TrGW Priority Modification . 47
10.2.18 Coordination of Video Orientation . 47
10.2.18.1 General . 47
10.2.18.2 Message sequence chart . 48
10.2.19 Generic image attributes . 49
10.2.19.1 General . 49
10.2.19.2 Indication of generic image attributes . 50
10.2.20 Interactive Connectivity Establishment (ICE) . 51
10.2.21 MSRP handling . 51
10.2.22 Alternative connection (ALTC) addresses management . 51
ETSI
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3GPP TS 29.162 version 15.0.0 Release 15 5 ETSI TS 129 162 V15.0.0 (2018-11)
10.2.23 Video Region-of-Interest (ROI) . 52
10.2.23.1 General . 52
10.2.23.2 "Far End Camera Control" mode . 52
10.2.23.2.1 General . 52
10.2.23.2.2 Message sequence chart. 52
10.2.23.3 "Predefined ROI" mode . 52
10.2.23.3.1 General . 52
10.2.23.3.2 Message sequence chart. 53
10.2.23.4 "Arbitrary ROI" mode . 53
10.2.23.4.1 General . 53
10.2.23.4.2 Message sequence chart. 53
10.2.24 SDP Capability Negotiation (SDPCapNeg) . 54
10.2.24.1 General . 54
10.2.24.2 Message sequence chart . 55
10.2.24.2.1 Audit SDPCapNeg Supported Capabilities . 55
10.2.25 WebRTC Media Plane Optimization . 55
10.2.25.1 General . 55
10.2.25.2 SDP offer handling . 56
10.2.25.3 SDP answer handling . 56
10.2.26 RTP-level pause and resume . 56
10.2.27 RTCP Codec Control Commands and Indications . 56
10.3 Void . 57
10.4 Procedures . 57
10.4.1 Call related Procedures . 57
10.4.1.1 Reserve TrGW Connection Point . 57
10.4.1.2 Configure TrGW Connection Point . 62
10.4.1.3 Reserve and Configure TrGW Connection Point . 67
10.4.1.4 Release TrGW Termination . 73
10.4.1.5 IP Bearer Released . 73
10.4.1.6 Media Inactivity Detection . 74
10.4.1.7 Termination heartbeat indication . 74
10.4.1.8 Change Through-Connection . 75
10.4.1.9 ECN Failure Indication . 75
10.4.1.10 Change Flow Direction . 76
10.4.1.11 ICE Connectivity Check Result Notification . 76
10.4.1.12 ICE New Peer Reflexive Candidate Notification . 77
10.4.2 Non Call related Procedures . 77
Annex A (informative): Void. . 79
Annex B (informative): Change history . 80
History . 81
ETSI
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3GPP TS 29.162 version 15.0.0 Release 15 6 ETSI TS 129 162 V15.0.0 (2018-11)
Foreword
rd
This Technical Specification has been produced by the 3 Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG
...