ITU-T Kaleidoscope Conference Innovations in NGN. VCC Service: Standardization of Integration between CS domain and IMS

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1 ITU-T Kaleidoscope Conference Innovations in NGN VCC Service: Standardization of Integration between CS domain and IMS Rodrigo Bellotto Campacci Universidade de São Paulo Portugal Telecom Inovação Brasil

2 Agenda Introduction The VCC Service Integration between CS and IMS Conclusions Questions First ITU-T Kaleidoscope Conference Innovations in NGN 2

3 Introduction If you can dream it, you can do it. Walt Disney Result of Master Degree research Sponsored by PT Inovação Brasil About New 3GPP Release Published in July/2007 First ITU-T Kaleidoscope Conference Innovations in NGN 3

4 Introduction Contextualization People are looking for Multimedia and Interactivity Convergence and Mobility NGN was created to reach these points IP Multimedia Core Network (IMS) Implements NGN, inside 3GPP Many networks as access networks Has a lot of services specified First ITU-T Kaleidoscope Conference Innovations in NGN 4

5 The VCC Service Voice Call Continuity Uses 3GPP Core Network and at least 2 3GPP Access Networks Is very important to IMS and NGN Like handover between cells in a GSM network It guarantees mobility in a convergent network Provides the ability to keep a call even if the access network used is changed User should not perceive audio interruption First ITU-T Kaleidoscope Conference Innovations in NGN 5

6 Uses a B2BUA SIP Application Alan The VCC Service How it works? When a domain transfer is needed Updates the audio source on the destiny Accordingly to the new network used Signal loss 3GPP CS 3GPP WiFi IMS Unreachable IMS VCC B2BUA PSTN First ITU-T Kaleidoscope Conference Innovations in NGN 6 Bob Anchoring in IMS

Bob #A,#B SCP CAMEL Unspecified Interface IMS Alan SGW / MGCF MGW #A,#?

7 The VCC Service CS to IMS Forward CS initiated calls to IMS Static Routing at MSCs CAMEL Service Could lose some information! Bob #A,#B SCP CAMEL Unspecified Interface IMS Alan SGW / MGCF MGW #A,#? Should be discovered by SCP IMS Interface First ITU-T Kaleidoscope Conference Innovations in NGN 7

8 The VCC Service Architecture 3GPP TS Functional Entities Reference Points IETF SIP: Gm, ISC, Ma, Mg, Mw DIAMETER: Sh, Cx 3GPP A/lu, ISUP, CAP, MAP VCC Application First ITU-T Kaleidoscope Conference Innovations in NGN 8 VMSC ISUP MGCF GMSC ISUP PLMN/ PSTN A/Iu Mg CAP gsm SCF Unspecified Interface CAMEL Service CS Adaptation Function I-CSCF VCC UE V3 Mw Gm Domain Selection Function Domain Transfer Function S-CSCF P-CSCF Sh Ma Ma ISC ISC ISC Sh Cx IP Multimedia PLMN/ Networks PSTN MAP HSS 3GPP IMS VCC Mw

9 Integration Between CS and IMS Interfaces have not been specified Vendor dependent Problems to interoperate Proposal Call Data Storage Function (CDSF) VMSC ISUP MGCF GMSC ISUP PLMN/ PSTN A/Iu Mg CAP gsm SCF Unspecified Interface CAMEL Service CS Adaptation Function I-CSCF VCC UE V3 VCC Application Mw Gm Domain Selection Function Domain Transfer Function S-CSCF P-CSCF Sh Ma Ma ISC ISC ISC Sh Cx IP Multimedia PLMN/ Networks PSTN MAP HSS Mw First ITU-T Kaleidoscope Conference Innovations in NGN 9

10 Integration Between CS and IMS CDSF is responsible for Storing data which could be lost Reference (PK), Calling, Called, Date Keeping a list of known references IMRN used to route to IMS CSRN used to route to CS Controlling their usage statuses Free or been used Shared between CAMEL Service/CSAF/DSF To avoid collision in the same voice channel First ITU-T Kaleidoscope Conference Innovations in NGN 10

11 Integration Between CS and IMS May

12 Alan Integration Between CS and IMS CDSF is working Many scenarios successfully tested Implementation was demonstrated at FUTURECOM 2007 #A,#B Vivo GSM Network SCP CAMEL Proposed Interface SGW / MGCF MGW CDSF IMS SHIPNET First ITU-T Kaleidoscope Conference Innovations in NGN 12 Bob #A,#B Discovered by SCP CDSF IMS Interface

13 Conclusions Contribution to VCC Standards It is possible to integrate CS and IMS Could be used an open interface Interoperability guaranteed Separation of Control and User Plane Fundamental to implement the VCC Migration to IMS VCC is an advantage First ITU-T Kaleidoscope Conference Innovations in NGN 13

14 ITU-T Kaleidoscope Conference Innovations in NGN VCC Service: Standardization of Integration between CS domain and IMS Thank You Very Much! Questions?

ETSI TS V7.5.0 ( ) Technical Specification

ETSI TS V7.5.0 ( ) Technical Specification TS 123 206 V7.5.0 (2008-01) Technical Specification Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Voice Call Continuity (VCC) between Circuit