ETSI TS 124 237 V10.15.0 (2014-07)

Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) service continuity; Stage 3 (3GPP TS 24.237 version 10.15.0 Release 10)

RTS/TSGC-0124237vaf0

General Information

• Status: Published
• Publication Date: 10-Jul-2014
• Technical Committee: 3GPP CT 1 - MM/CC/SM [lu] (formely CN1)
• Current Stage: 12 - Completion
• Due Date: 14-Jul-2014
• Completion Date: 11-Jul-2014

Standards Content (Sample)

ETSI TS 124 237 V10.15.0 (2014-07)






TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
LTE;
IP Multimedia (IM) Core Network (CN)
subsystem IP Multimedia Subsystem (IMS) service continuity;
Stage 3
(3GPP TS 24.237 version 10.15.0 Release 10)

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3GPP TS 24.237 version 10.15.0 Release 10 1 ETSI TS 124 237 V10.15.0 (2014-07)



Reference
RTS/TSGC-0124237vaf0
Keywords
LTE,UMTS
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ETSI

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3GPP TS 24.237 version 10.15.0 Release 10 2 ETSI TS 124 237 V10.15.0 (2014-07)
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 (http://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 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
http://webapp.etsi.org/key/queryform.asp.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "may not", "need", "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 24.237 version 10.15.0 Release 10 3 ETSI TS 124 237 V10.15.0 (2014-07)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 10
1 Scope . 11
2 References . 11
3 Definitions and abbreviations . 14
3.1 Definitions . 14
3.2 Abbreviations . 16
4 Overview of IP Multimedia (IM) Core Network (CN) subsystem Service Continuity . 16
4.1 General . 16
4.2 Underlying network capabilities . 17
4.2.1 General . 17
4.2.2 PS-CS session continuity, Single Radio . 17
4.3 URI and address assignments . 17
5 Functional entities . 18
5.1 Introduction . 18
5.2 User Equipment (UE) . 18
5.3 Application Server (AS) . 18
5.4 MSC server . 18
5.5 EATF . 19
5.6 Access Transfer Control Function (ATCF) . 19
6 Roles for registration in the IM CN subsystem for service continuity . 20
6.1 Introduction . 20
6.2 SC UE . 20
6.3 SCC AS . 20
6.3.1 General . 20
6.3.2 Triggers for the SCC AS providing information to ATCF . 21
6.3.3 SCC AS providing the SRVCC related information to the ATCF . 21
6.4 MSC server . 22
6.5 Access Transfer Control Function (ATCF) . 22
6.5.1 Distinction of requests . 22
6.5.2 Registration related procedures in the ATCF . 22
6.5.3 ATCF receiving the SRVCC-related information . 23
6A Roles for General Capabilities . 23
6A.1 Introduction . 23
6A.2 UE roles . 24
6A.3 ATCF . 24
6A.3.1 SRVCC information bound to the registration path . 24
6A.4 SCC AS . 25
6A.4.1 Handling of OMR specific attributes . 25
6A.4.2 Void . 26
6A.4.3 Void . 26
6A.4.3A INVITE responses towards the MSC server . 26
6A.4.4 Void . 26
6A.4.5 Void . 26
6A.4.6 Rejecting malicious REFER requests from remote UE . 26
6A.5 SDP media description conflict between target and remote access leg . 27
7 Roles for call origination for service continuity . 27
7.1 Introduction . 27
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3GPP TS 24.237 version 10.15.0 Release 10 4 ETSI TS 124 237 V10.15.0 (2014-07)
7.2 SC UE . 27
7.2.1 General . 27
7.2.2 Additional procedures with MSC server assisted mid-call feature . 28
7.3 SCC AS . 28
7.3.1 Distinction of requests sent to the SCC AS . 28
7.3.2 Call origination procedures at the SCC AS . 28
7.3.3 Subscription related procedures in the SCC AS . 29
7.4 EATF . 30
7.4.1 Distinction of requests sent to the EATF . 30
7.4.2 Call origination procedures at the EATF . 30
7.5 Access Transfer Control Function (ATCF) . 30
7.5.1 Distinction of requests . 30
7.5.2 Call origination procedures in the ATCF . 30
7.5.3 Procedures in the ATCF for originating requests not related to a call . 31
8 Roles for call termination for service continuity . 32
8.1 Introduction . 32
8.2 SC UE . 32
8.3 SCC AS . 33
8.3.1 Distinction of requests sent to the SCC AS . 33
8.3.2 Call termination procedures in the SCC AS . 33
8.4 Access Transfer Control Function (ATCF) . 34
8.4.1 Distinction of requests . 34
8.4.2 Call termination procedures in the ATCF . 34
9 Roles for PS-CS access transfer . 35
9.1 Introduction . 35
9.1A Additional procedures with MSC Server assisted mid-call feature . 35
9.2 SC UE . 35
9.2.0 General . 35
9.2.1 SC UE procedures for PS to CS access transfer . 35
9.2.1A SC UE procedures for PS to CS access transfer with MSC server assisted mid-call feature . 36
9.2.1B SC UE procedures for PS to CS access transfer with MSC server assisted mid-call feature for speech
and video session . 38
9.2.2 SC UE procedures for CS to PS access transfer . 38
9.2.3 SC UE procedures for CS to PS access transfer with MSC server assisted mid-call feature . 39
9.3 SCC AS . 40
9.3.0 General . 40
9.3.1 Distinction of requests sent to the SCC AS . 40
9.3.2 SCC AS procedures for PS to CS access transfer . 41
9.3.2A SCC AS procedures for PS to CS access transfer with MSC server assisted mid-call feature . 42
9.3.3 SCC AS procedures for CS to PS access transfer . 45
9.3.4 SCC AS procedures for CS to PS access transfer with MSC server assisted mid-call feature . 45
9.4 MSC server enhanced for ICS . 47
9.4.1 Void . 47
9.4.1A Void . 47
9.5 PS to CS session continuity with MSC server assisted mid-call feature . 47
9.6 PS to CS session continuity with MSC server assisted mid-call feature for speech and video session . 48
10 Roles for PS-PS access transfer . 49
10.1 Introduction . 49
10.2 SC UE . 49
10.2.0 General . 49
10.2.1 Full session transfer . 50
10.2.1A Additional procedures for full session transfer when MSC server assisted mid-call feature is
supported . 51
10.2.2 Partial session transfer . 51
10.2.3 Additional procedures for partial session transfer when MSC server assisted mid-call feature is
supported . 52
10.3 SCC AS . 52
10.3.1 Distinction of requests sent to the SCC AS . 52
10.3.2 PS to PS access transfer procedures at the SCC AS . 52
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3GPP TS 24.237 version 10.15.0 Release 10 5 ETSI TS 124 237 V10.15.0 (2014-07)
10.3.3 Additional SCC AS procedures for PS to PS access transfer when MSC server assisted mid-call
feature is supported . 54
10.3.4 S-CSCF releasing the source access leg during PS to PS access transfer . 54
10.3.5 P-CSCF releasing the source access leg during PS to PS access transfer . 55
10.3.6 P-CSCF releasing early dialog during PS to PS access transfer . 55
11 Roles for PS-PS access transfer in conjunction with PS-CS access transfer . 55
11.1 Introduction . 55
11.2 SC UE . 56
11.2.1 SC UE procedures for PS to PS+CS access transfer . 56
11.2.1.1 General . 56
11.2.1.2 SC UE procedures for PS to PS+CS access transfer using ICS . 56
11.2.1.3 SC UE procedures for PS to PS+CS access transfer not using ICS . 56
11.2.1.4 SC UE procedures for PS to PS+CS access transfer not using ICS with MSC server assisted mid-
call feature . 57
11.2.2 SC UE procedures for PS+CS to PS access transfer . 57
11.2.2.1 General . 57
11.2.2.2 SC UE procedures for PS+CS to PS access transfer using ICS . 57
11.2.2.3 SC UE procedures for PS+CS to PS access transfer not using ICS . 58
11.3 SCC AS . 58
11.3.1 Distinction of requests sent to the SCC AS . 58
11.3.2 SCC AS procedures for PS to PS+CS access transfer . 58
11.3.3 SCC AS procedures for PS+CS to PS access transfer . 59
12 Roles for PS-CS access transfer, Single Radio . 60
12.1 Introduction . 60
12.2 SC UE procedures for PS to CS access transfer, SR-VCC . 60
12.2.1 General . 60
12.2.2 ICS-based . 60
12.2.3 Not based on ICS . 61
12.2.3A Not based on ICS with MSC Server assisted mid-call feature . 61
12.2.3B Alerting call . 62
12.2.3B.1 General . 62
12.2.3B.1A Considerations for MSC server assisted mid-call feature . 63
12.2.3B.2 Assignment of Transaction Identifiers to the transferred sessions . 63
12.2.3B.3 Single call in alerting state . 63
12.2.3B.3.1 Terminating call in alerting phase . 63
12.2.3B.3.2 Originating call in alerting phase . 64
12.2.3B.4 Established call with a session in alerting state . 64
12.2.3B.4.1 Active session with incoming call in alerting phase . 64
12.2.3B.4.2 Held session with new outgoing call in alerting phase . 64
12.2.4 Abnormal cases . 64
12.2.4.1 Confirmed dialog . 64
12.2.4.2 Early dialog . 65
12.3 SCC AS . 65
12.3.0 General . 65
12.3.0A Distinction of requests sent to the SCC AS . 65
12.3.1 SCC AS procedures for PS to CS access transfer, SR-VCC . 65
12.3.2 SCC AS procedures for PS to CS access transfer with MSC server assisted mid-call feature, SR-
VCC . 66
12.3.3 SCC AS procedures for SR-VCC, abnormal case . 67
12.3.3.1 SR-VCC cancelled by MME/SGSN or failure by UE to transition to CS domain for ongoing
session . 67
12.3.3.1A SR-VCC cancelled by MME/SGSN or failure by UE to transition to CS domain for session in
early dialog state . 68
12.3.3.2 P-CSCF releasing the source access leg during SR-VCC . 68
12.3.3.3 P-CSCF releasing the source access leg when call is in alerting phase . 69
12.3.3.4 PS to CS SRVCC cancelled by MME/SGSN or release of the target access leg for ongoing
session .
...