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TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
Single Radio Voice Call Continuity (SRVCC);
Stage 2
(3GPP TS 23.216 version 15.2.0 Release 15)
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3GPP TS 23.216 version 15.2.0 Release 15 1 ETSI TS 123 216 V15.2.0 (2018-07)
Reference
RTS/TSGS-0223216vf20
Keywords
GSM,LTE,UMTS
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3GPP TS 23.216 version 15.2.0 Release 15 2 ETSI TS 123 216 V15.2.0 (2018-07)
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/).
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server) which are, or may be, or may become, essential to the present document.
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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 23.216 version 15.2.0 Release 15 3 ETSI TS 123 216 V15.2.0 (2018-07)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 6
1 Scope . 7
2 References . 7
3 Definitions and abbreviations . 9
3.1 Definitions . 9
3.2 Abbreviations . 10
4 High level Principles and Concepts . 10
4.1 High level Principle s . 10
4.1.1 Architectural Principles for 3GPP2 1xCS SRVCC . 10
4.1.2 Architectural Principles for SRVCC and vSRVCC to 3GPP UTRAN/GERAN . 10
4.1.3 Architectural Principles for SRVCC to 3GPP E-UTRAN/UTRAN (HSPA) . 11
4.2 Concepts . 11
4.2.1 E-UTRAN to 3GPP2 1xCS SRVCC . 11
4.2.2 E-UTRAN to 3GPP UTRAN/GERAN SRVCC . 12
4.2.2a E-UTRAN to 3GPP UTRAN vSRVCC . 13
4.2.3 UTRAN (HSPA) to 3GPP UTRAN/GERAN SRVCC . 14
4.2.4 SRVCC for IMS emergency sessions . 15
4.2.4.1 E-UTRAN/UTRAN (HSPA) to 3GPP UTRAN/GERAN . 15
4.2.4.2 E-UTRAN to 3GPP2 1xCS . 16
4.2.4.3 SRVCC in Limited Service Mode . 17
4.2.4.3.1 E-UTRAN/UTRAN (HSPA) to 3GPP UTRAN/GERAN . 17
4.2.4.3.2 E-UTRAN to 3GPP2 1xCS . 17
4.2.4.4 eCall over IMS . 17
4.2.5 Void . 18
4.2.6 CS to PS SRVCC . 18
5 Architecture model and reference points . 18
5.1 General . 18
5.2 Reference architecture . 19
5.2.1 E-UTRAN to 3GPP2 1xCS SRVCC architecture . 19
5.2.2 E-UTRAN to 3GPP UTRAN/GERAN SRVCC architecture . 19
5.2.2a 3GPP E-UTRAN to 3GPP UTRAN vSRVCC architecture . 20
5.2.3 UTRAN (HSPA) to 3GPP UTRAN/GERAN SRVCC architecture . 21
5.2.4 3GPP UTRAN/GERAN to 3GPP E-UTRAN or UTRAN (HSPA) SRVCC architecture . 21
5.2.5 3GPP GERAN to 3GPP UTRAN (HSPA) SRVCC architecture . 22
5.3 Functional Entities . 23
5.3.1 3GPP2 1x CS SRVCC interworking solution function (1xCS IWS) . 23
5.3.2 MSC Server enhanced for E-UTRAN/UTRAN (HSPA) to 3GPP UTRAN/GERAN SRVCC . 23
5.3.2a MSC Server enhanced for vSRVCC . 24
5.3.2b MSC Server enhanced for CS to PS SRVCC. 24
5.3.3 MME . 24
5.3.3.1 Interworking with 3GPP2 1xCS IWS . 24
5.3.3.1.1 Interworking with 3GPP2 1xCS IWS . 24
5.3.3.1.2 Selection of 3GPP2 1xCS IWS . 25
5.3.3.2 Interworking with 3GPP MSC Server enhanced for SRVCC from E-UTRAN / UTRAN (HSPA)
to 3GPP UTRAN/GERAN . 25
5.3.3.2.1 Interworking with 3GPP MSC Server enhanced for (v)SRVCC . 25
5.3.3.2.2 PS bearer splitting function . 25
5.3.3.2.3 Selection of MSC enhanced for SRVCC . 25
5.3.3.3 Interworking of Target MME with 3GPP MSC Server enhanced for SRVCC from CS to PS . 25
5.3.3A SGSN . 26
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3GPP TS 23.216 version 15.2.0 Release 15 4 ETSI TS 123 216 V15.2.0 (2018-07)
5.3.3A.1 Interworking with 3GPP MSC Server enhanced for SRVCC from E-UTRAN / UTRAN (HSPA)
to 3GPP UTRAN/GERAN . 26
5.3.3A.1.1 Interworking with 3GPP MSC Server enhanced for SRVCC. 26
5.3.3A.1.2 PS bearer splitting function . 26
5.3.3A.1.3 Selection of MSC enhanced for SRVCC . 26
5.3.3A.2 Interworking of Target SGSN with 3GPP MSC Server enhanced for SRVCC from CS to PS . 26
5.3.4 UE enhanced for SRVCC . 26
5.3.4.1 Interworking with 3GPP2 1xCS . 26
5.3.4.2 Interworking with 3GPP UTRAN/GERAN for SRVCC from E-UTRAN / UTRAN (HSPA) to
3GPP UTRAN/GERAN . 27
5.3.4.3 Interworking of UE with 3GPP UTRAN/GERAN for SRVCC from CS to PS . 27
5.3.4a UE enhanced for vSRVCC . 27
5.3.5 Serving/PDN GW . 27
5.3.6 E-UTRAN . 27
5.3.6.1 Interworking with 3GPP2 1xCS . 27
5.3.6.2 Interworking with 3GPP UTRAN/GERAN for SRVCC from E-UTRAN to 3GPP
UTRAN/GERAN . 27
5.3.6.2a Interworking with 3GPP UTRAN for vSRVCC . 28
5.3.6A UTRAN (HSPA) . 28
5.3.6B GERAN/UTRAN CS . 28
5.3.7 HSS . 28
5.3.7.1 Interworking with 3GPP UTRAN/GERAN for SRVCC or vSRVCC from E-UTRAN / UTRAN
(HSPA) to 3GPP UTRAN/GERAN . 28
5.3.7.2 Interworking with 3GPP UTRAN/GERAN for SRVCC from CS to PS . 29
5.3.8 PCC . 29
5.4 Reference points . 29
5.4.1 MME – 3GPP2 1xCS IWS (S102) . 29
5.4.2 MME/SGSN – MSC Server (Sv) . 29
5.4.3 E-UTRAN – MME (S1-MME) . 29
5.4.3A UTRAN (HSPA) – SGSN (Iu-ps) . 29
5.4.4 HSS – MME (S6a) . 30
5.4.5 HSS – SGSN (Gr, S6d) . 30
5.4.6 HSS - MSC (MAP D) . 30
6 Procedures and flows. 30
6.1 SRVCC from E-UTRAN to 3GPP2 1xCS . 30
6.1.1 E-UTRAN Attach procedure for SRVCC . 30
6.1.2 Service Request procedures for SRVCC . 30
6.1.2A PS Handover procedures for SRVCC . 30
6.1.3 Call flows for SRVCC from E-UTRAN . 30
6.2 E-UTRAN and 3GPP GERAN/UTRAN (v)SRVCC . 33
6.2.1 E-UTRAN Attach procedure for (v)SRVCC . 33
6.2.1A Service Request procedures for (v)SRVCC . 33
6.2.1B PS Handover procedures for (v)SRVCC . 33
6.2.1C Dedicated Bearer Establishment and Modification procedures for vSRVCC . 34
6.2.2 Call flows for (v)SRVCC from E-UTRAN . 34
6.2.2.1 SRVCC from E-UTRAN to GERAN without DTM support . 34
6.2.2.1A SRVCC from E-UTRAN to GERAN with DTM but without DTM HO support and from E-
UTRAN to UTRAN without PS HO . 38
6.2.2.2 SRVCC from E-UTRAN to UTRAN with PS HO or GERAN with DTM HO support . 38
6.2.2.3 vSRVCC from E-UTRAN to UTRAN with PS HO support. 43
6.2.2.4 vSRVCC from E-UTRAN to UTRAN without PS HO support . 46
6.2.3 Returning back to E-UTRAN . 46
6.3 UTRAN (HSPA) and 3GPP GERAN/UTRAN SRVCC . 47
6.3.1 GPRS Attach procedure for SRVCC . 47
6.3.1A Service Request procedures for SRVCC . 47
6.3.1B PS Handover procedures for SRVCC . 47
6.3.2 Call flows for SRVCC from UTRAN (HSPA) . 48
6.3.2.1 SRVCC from UTRAN (HSPA) to GERAN without DTM support . 48
6.3.2.1A SRVCC from UTRAN (HSPA) to GERAN with DTM but without DTM HO support and from
UTRAN (HSPA) to UTRAN without PS HO . 51
6.3.2.2 SRVCC from UTRAN (HSPA) to UTRAN or GERAN with DTM HO support . 51
ETSI
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3GPP TS 23.216 version 15.2.0 Release 15 5 ETSI TS 123 216 V15.2.0 (2018-07)
6.4 CS to PS SRVCC . 55
6.4.1 GPRS Attach procedure for SRVCC . 55
6.4.2 E-UTRAN Attach procedure for SRVCC . 55
6.4.3 Call flows for SRVCC to E-UTRAN/UTRAN (HSPA) . 55
6.4.3.1 SRVCC to E-UTRAN/UTRAN (HSPA) from GERAN without DTM/PS HO support . 55
6.4.3.2 SRVCC to E-UTRAN/UTRAN (HSPA) from GERAN with DTM support but without DTM HO
support and SRVCC to E-UTRAN from UTRAN without PS HO support . 58
6.4.3.3 SRVCC to E-UTRAN/UTRAN (HSPA) with DTM/PS HO support . 58
7 Charging . 58
8 Handover Failure . 58
8.1 Failure in EUTRAN/UTRAN (HSPA) to 3GPP UTRAN/GERAN (v)SRVCC . 58
8.1.1 Failure before MSC Server initiates Session Transfer . 58
8.1.1a Failure after MSC Server initiates Session Transfer . 58
8.1.1a.1 Failure before responding to PS to CS HO request . 58
8.1.1a.2 Failure after responding to PS to CS HO request . 59
8.1.2 Failure after UE receives HO command . 60
8.1.3 Handover Cancellation . 60
8.1.4 Handover Failure due to alerting/pre-alerting state . 61
8.2 Failure in CS to PS SRVCC . 62
8.2.1 Failure before UE initiates Session Transfer detected by MSC Server . 62
8.2.2 Failure before UE initiates Session Transfer detected by MME . 62
8.2.3 CS to PS Handover Cancellation . 63
9 Security. 63
9.1 Network Domain Security with 3GPP2 1xCS IWS . 63
9.2 Network Domain Security with 3GPP UTRAN/GERAN MSC Server . 64
Annex A (informative): Determination of Neighbour Cell List . 65
A.1 SRVCC from E-UTRAN to 3GPP2 1xCS . 65
A.2 SRVCC from E-UTRAN to GERAN / UTRAN . 65
A.3 SRVCC from UTRAN (HSPA) to GERAN / UTRAN . 65
A.4 SRVCC from GERAN / UTRAN to E-UTRAN / UTRAN (HSPA) . 65
Annex B (informative): Change history . 67
History . 69
ETSI
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3GPP TS 23.216 version 15.2.0 Release 15 6 ETSI TS 123 216 V15.2.0 (2018-07)
Foreword
This Technical Specification has been produced by the 3rd 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 approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
ETSI
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3GPP TS 23.216 version 15.2.0 Release 15 7 ETSI TS 123 216 V15.2.0 (2018-07)
1 Scope
This document specifies the architecture enhancements for Single Radio Voice Call Continuity (SRVCC) between the
following access systems for voice calls that are anchored in the IMS:
- from E-UTRAN to 3GPP2 1xCS;
- from E-UTRAN to UTRAN/GERAN;
- from UTRAN (HSPA) to UTRAN/GERAN.
- from UTRAN/GERAN to E-UTRAN.
- from GERAN to UTRAN (HSPA).
This document will not describe 3GPP2 functional entities. However, interfaces between both 3GPP and 3GPP2
functional entities are described in this specification.
SRVCC from E-UTRAN access to 3GPP2 1xCS is covered in this specification, including the handling of IMS
emergency call continuity. Handling of non-voice component and SRVCC from 3GPP2 1xCS to E-UTRAN direction is
not specified in this release.
SRVCC from E-UTRAN/UTRAN (HSPA) access and 3GPP UTRAN/GERAN CS accesses for voice calls that are
anchored in the IMS, as well as the coordination between the SRVCC for voice call and the handover of non-voice PS
bearers are covered in this specification. SRVCC with IMS emergency call continuity from E-UTRAN/UTRAN
(HSPA) to 3GPP UTRAN/GERAN CS accesses for voice calls is covered in this specification. SRVCC with eCall over
IMS continuity from E-UTRAN/UTRAN (HSPA) to 3GPP UTRAN/GERAN CS accesses is covered in this
specification. SRVCC with priority handling from E-UTRAN to 3GPP UTRAN/GERAN CS accesses for voice or
voice and video calls is also covered in this specification. The handover of non-voice PS bearer from E-UTRAN is
specified by the procedures defined in TS 23.401 [2], TS 23.060 [10], TS 25.413 [11] and TS 43.129 [12]. The
handover of non voice PS bearer from UTRAN (HSPA) is specified by the procedures defined in TS 23.060 [10],
TS 25.413 [11] and TS 43.129 [12].
This document specifies the architecture enhancements for Single Radio Video Call Continuity (vSRVCC) from E-
UTRAN to UTRAN-CS access for Video Calls that are anchored in the IMS.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
- For a specific reference, subsequent revisions do not apply.
- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including
a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
[2] 3GPP TS 23.401: "GPRS enhancements for E-UTRAN access".
[3] 3GPP TS 23.402: "Architecture enhancements for non-3GPP accesses".
[4] 3GPP2 X.S0042-0: "Voice Call Continuity between IMS and Circuit Switched System".
[5] Void.
[6] Void.
[7] 3GPP TR 36.938: "Improved Network Controlled Mobility between E-UTRAN and
3GPP2/Mobile WiMAX Radio Technologies".
ETSI
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3GPP TS 23.216 version 15.2.0 Release 15 8 ETSI TS
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