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TS 23.216 (SA2) ★
SRVCC – Single Radio Voice Call Continuity

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V16.2.0 (Wzip) 2019/09 74 p.

V15.3.0 (PDF) 2019/09 72 p.

V14.0.0 2016/09 72 p.

V13.2.0 2016/09 73 p.

V12.4.0 2016/06 71 p.

V11.11.0 2014/06 70 p.

V10.6.0 2013/06 47 p.

V9.9.0 2012/03 45 p.

V8.8.0 2012/03 37 p.

3GPP 23.216 - SRVCC architecture for E-UTRAN to UTRAN/GERAN

Rapporteur: Mr. Wong, Curt

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)

full Table of Contents for TS 23.216 Word version: 16.2.0

1 Scope Word-p. 7

3 Definitions and abbreviations Word-p. 9

3.1 Definitions

3.2 Abbreviations [R11] Word-p. 10

4 High level Principles and Concepts

4.1 High level Principles

4.1.1 Architectural Principles for 3GPP2 1xCS SRVCC

4.1.2 Architectural Principles for SRVCC and vSRVCC to 3GPP UTRAN/GERAN Word-p. 11

4.1.3 Architectural Principles for SRVCC to 3GPP E-UTRAN/UTRAN (HSPA) [R11]

4.1.4 Architectural Principles for 5G-SRVCC to UTRAN [R16] Word-p. 12

4.2.1 E-UTRAN to 3GPP2 1xCS SRVCC

4.2.2 E-UTRAN to 3GPP UTRAN/GERAN SRVCC

4.2.2a E-UTRAN to 3GPP UTRAN vSRVCC [R11] Word-p. 13

4.2.3 UTRAN (HSPA) to 3GPP UTRAN/GERAN SRVCC Word-p. 14

4.2.4 SRVCC for IMS emergency sessions [R9] Word-p. 15

4.2.4.1 E-UTRAN/UTRAN (HSPA) to 3GPP UTRAN/GERAN

4.2.4.2 E-UTRAN to 3GPP2 1xCS Word-p. 16

4.2.4.3 SRVCC in Limited Service Mode Word-p. 17

4.2.4.3.1 E-UTRAN/UTRAN (HSPA) to 3GPP UTRAN/GERAN

4.2.4.3.2 E-UTRAN to 3GPP2 1xCS

4.2.4.4 eCall over IMS [R14] Word-p. 18

4.2.6 CS to PS SRVCC [R11]

4.2.7 NG-RAN to 3GPP UTRAN 5G-SRVCC [R16] Word-p. 19

5 Architecture model and reference points Word-p. 20

5.2 Reference architecture

5.2.1 E-UTRAN to 3GPP2 1xCS SRVCC architecture

5.2.2 E-UTRAN to 3GPP UTRAN/GERAN SRVCC architecture

5.2.2a 3GPP E-UTRAN to 3GPP UTRAN vSRVCC architecture [R11] Word-p. 21

5.2.3 UTRAN (HSPA) to 3GPP UTRAN/GERAN SRVCC architecture Word-p. 22

5.2.4 3GPP UTRAN/GERAN to 3GPP E-UTRAN or UTRAN (HSPA) SRVCC architecture [R11]

5.2.5 3GPP GERAN to 3GPP UTRAN (HSPA) SRVCC architecture [R11] Word-p. 23

5.2.6 NG-RAN to 3GPP UTRAN 5G-SRVCC architecture [R16] Word-p. 24

5.3 Functional Entities Word-p. 25

5.3.1 3GPP2 1x CS SRVCC interworking solution function (1xCS IWS)

5.3.2 MSC Server enhanced for E-UTRAN/UTRAN (HSPA) to 3GPP UTRAN/GERAN SRVCC

5.3.2a MSC Server enhanced for vSRVCC [R11]

5.3.2b MSC Server enhanced for CS to PS SRVCC [R11]

5.3.3 MME Word-p. 26

5.3.3.1 Interworking with 3GPP2 1xCS IWS

5.3.3.1.1 Interworking with 3GPP2 1xCS IWS [R10]

5.3.3.1.2 Selection of 3GPP2 1xCS IWS [R10]

5.3.3.2 Interworking with 3GPP MSC Server enhanced for SRVCC from E-UTRAN / UTRAN (HSPA) to 3GPP UTRAN/GERAN Word-p. 27

5.3.3.2.1 Interworking with 3GPP MSC Server enhanced for (v)SRVCC

5.3.3.2.2 PS bearer splitting function

5.3.3.2.3 Selection of MSC enhanced for SRVCC [R10]

5.3.3.3 Interworking of Target MME with 3GPP MSC Server enhanced for SRVCC from CS to PS [R11]

5.3.3.4 MME_SRVCC [R16] Word-p. 28

5.3.3A.1 Interworking with 3GPP MSC Server enhanced for SRVCC from E-UTRAN / UTRAN (HSPA) to 3GPP UTRAN/GERAN

5.3.3A.1.1 Interworking with 3GPP MSC Server enhanced for SRVCC

5.3.3A.1.2 PS bearer splitting function

5.3.3A.1.3 Selection of MSC enhanced for SRVCC [R10]

5.3.3A.2 Interworking of Target SGSN with 3GPP MSC Server enhanced for SRVCC from CS to PS [R11] Word-p. 29

5.3.4 UE enhanced for SRVCC

5.3.4.1 Interworking with 3GPP2 1xCS

5.3.4.2 Interworking with 3GPP UTRAN/GERAN for SRVCC from E-UTRAN / UTRAN (HSPA) to 3GPP UTRAN/GERAN

5.3.4.3 Interworking of UE with 3GPP UTRAN/GERAN for SRVCC from CS to PS [R11]

5.3.4a UE enhanced for vSRVCC [R11]

5.3.4b UE enhanced for 5G-SRVCC [R16] Word-p. 30

5.3.5 Serving/PDN GW

5.3.6.1 Interworking with 3GPP2 1xCS

5.3.6.2 Interworking with 3GPP UTRAN/GERAN for SRVCC from E-UTRAN to 3GPP UTRAN/GERAN

5.3.6.2a Interworking with 3GPP UTRAN for vSRVCC [R11]

5.3.6A UTRAN (HSPA) Word-p. 31

5.3.6B GERAN/UTRAN CS [R11]

5.3.7.1 Interworking with 3GPP UTRAN/GERAN for SRVCC or vSRVCC from E-UTRAN / UTRAN (HSPA) to 3GPP UTRAN/GERAN

5.3.7.2 Interworking with 3GPP UTRAN/GERAN for SRVCC from CS to PS [R11]

5.3.8 PCC Word-p. 32

5.3.9 UDM [R16]

5.3.10 AMF [R16]

5.3.11 NG-RAN [R16]

5.4 Reference points

5.4.1 MME - 3GPP2 1xCS IWS (S102)

5.4.2 MME/SGSN - MSC Server (Sv) Word-p. 33

5.4.2A MME_SRVCC - MSC Server (Sv) [R16]

5.4.3 E-UTRAN - MME (S1-MME)

5.4.3A UTRAN (HSPA) - SGSN (Iu-ps)

5.4.4 HSS - MME (S6a)

5.4.5 HSS - SGSN (Gr, S6d)

5.4.6 HSS - MSC (MAP D) [R11]

5.4.7 AMF - MME_SRVCC [R16]

5.4.8 NG-RAN - AMF [R16] Word-p. 34

6 Procedures and flows

6.1 SRVCC from E-UTRAN to 3GPP2 1xCS

6.1.1 E-UTRAN Attach procedure for SRVCC

6.1.2 Service Request procedures for SRVCC

6.1.2A PS Handover procedures for SRVCC [R9]

6.1.3 Call flows for SRVCC from E-UTRAN

6.2 E-UTRAN and 3GPP GERAN/UTRAN (v)SRVCC Word-p. 37

6.2.1 E-UTRAN Attach procedure for (v)SRVCC

6.2.1A Service Request procedures for (v)SRVCC

6.2.1B PS Handover procedures for (v)SRVCC [R9]

6.2.1C Dedicated Bearer Establishment and Modification procedures for vSRVCC [R11] Word-p. 38

6.2.2 Call flows for (v)SRVCC from E-UTRAN

6.2.2.1 SRVCC from E-UTRAN to GERAN without DTM support

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 Word-p. 42

6.2.2.2 SRVCC from E-UTRAN to UTRAN with PS HO or GERAN with DTM HO support

6.2.2.3 vSRVCC from E-UTRAN to UTRAN with PS HO support [R11] Word-p. 47

6.2.2.4 vSRVCC from E-UTRAN to UTRAN without PS HO support [R11] Word-p. 50

6.2.3 Returning back to E-UTRAN [R12]

6.3 UTRAN (HSPA) and 3GPP GERAN/UTRAN SRVCC Word-p. 51

6.3.1 GPRS Attach procedure for SRVCC

6.3.1A Service Request procedures for SRVCC [R9]

6.3.1B PS Handover procedures for SRVCC [R9]

6.3.2 Call flows for SRVCC from UTRAN (HSPA) Word-p. 52

6.3.2.1 SRVCC from UTRAN (HSPA) to GERAN without DTM support

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 [R9] Word-p. 55

6.3.2.2 SRVCC from UTRAN (HSPA) to UTRAN or GERAN with DTM HO support

6.4 CS to PS SRVCC [R11] Word-p. 59

6.4.1 GPRS Attach procedure for SRVCC

6.4.2 E-UTRAN Attach procedure for SRVCC

6.4.3 Call flows for SRVCC to E-UTRAN/UTRAN (HSPA)

6.4.3.1 SRVCC to E-UTRAN/UTRAN (HSPA) from GERAN without DTM/PS HO support

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 Word-p. 62

6.4.3.3 SRVCC to E-UTRAN/UTRAN (HSPA) with DTM/PS HO support

6.5 5G-SRVCC from NG-RAN to 3GPP UTRAN [R16]

6.5.1 NG-RAN Registration procedure for SRVCC

6.5.2 Service Request procedures for SRVCC

6.5.3 Intra-5GS PS Handover procedure for SRVCC

6.5.4 5G-SRVCC from NG-RAN to 3GPP UTRAN procedure Word-p. 63

7 Charging Word-p. 64

8 Handover Failure Word-p. 65

8.1 Failure in EUTRAN/UTRAN (HSPA) to 3GPP UTRAN/GERAN (v)SRVCC

8.1.1 Failure before MSC Server initiates Session Transfer

8.1.1a Failure after MSC Server initiates Session Transfer [R10]

8.1.1a.1 Failure before responding to PS to CS HO request

8.1.1a.2 Failure after responding to PS to CS HO request Word-p. 66

8.1.2 Failure after UE receives HO command

8.1.3 Handover Cancellation

8.1.4 Handover Failure due to alerting/pre-alerting state [R15] Word-p. 68

8.2 Failure in CS to PS SRVCC [R11]

8.2.1 Failure before UE initiates Session Transfer detected by MSC Server

8.2.2 Failure before UE initiates Session Transfer detected by MME

8.2.3 CS to PS Handover Cancellation Word-p. 69

9 Security Word-p. 70

9.1 Network Domain Security with 3GPP2 1xCS IWS

9.2 Network Domain Security with 3GPP UTRAN/GERAN MSC Server

A Determination of Neighbour Cell List Word-p. 71

A.1 SRVCC from E-UTRAN to 3GPP2 1xCS

A.2 SRVCC from E-UTRAN to GERAN / UTRAN

A.3 SRVCC from UTRAN (HSPA) to GERAN / UTRAN

A.4 SRVCC from GERAN / UTRAN to E-UTRAN / UTRAN (HSPA) [R11] Word-p. 72

B Change history Word-p. 73