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TS 23.279 SA2 ★
Combining CS and IMS Services

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V15.0.0 (PDF) 2018/06 37 p.

V14.0.0 2017/03 39 p.

V13.0.0 2015/12 39 p.

V12.0.0 2014/09 39 p.

V11.0.0 2012/09 39 p.

V10.0.0 2011/03 39 p.

V9.0.0 2009/12 38 p.

V8.1.0 2007/09 38 p.

V7.7.0 2007/09 38 p.

Rapporteur: Mr. Hu, Yun-Chao

The combination of CS and IMS services (CSI) is the parallel operation of a CS service and an IMS session between the same two users. It does not require a specific subscription and a specific charging correlation.

This TS provides architectural details to combine CS services and IMS services for using them in parallel between the same two users in a peer-to-peer context. The document provides a detailed description of how capabilities and identities are exchanged to enable the combination of CS and IMS services between the same two UEs.

full Table of Contents for TS 23.279 Word version: 15.0.0

1 Scope Word-p. 6

3 Definitions and abbreviations Word-p. 7

3.1 Definitions

3.2 Abbreviations

4 Overall requirements Word-p. 8

4.1 General description

4.2 Service requirements

5 Architectural requirements

5.1 Architectural requirements

5.2 Session scenarios Word-p. 9

6 Architecture Word-p. 10

6.1 General Architecture

6.2 CSI Application Server (CSI AS) Word-p. 11

6.2.1 CSI AS functionality

6.2.2 Initial Filter Criteria

7 Capability exchange

7.2 Capability information Word-p. 12

7.2.1 Information about the current radio environment

7.2.2 UE capability information

7.2.3 IM Status Word-p. 13

7.3 Registering UE capability information

7.4 Multiple MEs per user

8 Information flows Word-p. 14

8.1 Exchange of capability information at CS call setup

8.2 Exchange of UE capability information Word-p. 15

8.3 User adds an IMS service to an ongoing CS call Word-p. 17

8.3.1 IMS session set up without media requiring resource reservation

8.3.2 IMS session set- up with media requiring resource reservation Word-p. 19

8.4 User adds a CS call to an ongoing IMS session Word-p. 21

8.5 Release of CSI Word-p. 22

8.6 Terminating a Multimedia IMS session to a CSI UE

9 Interaction with supplementary services Word-p. 24

9.2 Line Identification

9.2.1 Calling Line Identity Presentation (CLIP)

9.2.2 Calling Line Identification Restriction (CLIR)

9.2.3 Connected Line Identification Presentation (COLP) Word-p. 25

9.2.4 Connected Line Identification Restriction (COLR)

9.3 Call Forwarding

9.4 Call Offering

9.4.1 Explicit Call Transfer (ECT)

9.5 Call Completion Word-p. 26

9.5.1 Call Waiting (CW) and Call Hold (CH)

9.6 Call Barring

10 Other considerations

10.2 Relation to SMS

A Support of CSI origination towards IMS termination with CSI interworking Word-p. 27

A.1 Introduction

A.3.1 General Architecture

A.3.3 Call flows for setting up the voice session for CSI origination and IMS termination with CSI interworking Word-p. 28

A.3.4 Call flows for adding IMS sessions to existing voice calls for CSI origination with CSI interworking Word-p. 31

B Change history Word-p. 35