1. IMS – IP Multimedia Subsystem SINDHUJA GADDE UIN : 01008090

2. CONTENTS :  What is IMS  IMS architecture  IMS protocols  IMS services  Conclusion  References

3. What is IMS?  It is an architectural framework for delivering IP multimedia services.It is defined by 3GPP.  It provides integrated Internet-based, multimedia, multi-session applications to mobile users.  Guarentees QoS across different access network technologies.

4. Basic Principles  Access Independence  Different Network Architectures  Terminal and user mobility  Extensive IP-based services

5. Who needs IMS?  Mobile network users want location based services  Network providers want new business models fixed mobile convergence  Fixed network users want multimedia conferencing voice over IP

6. Management Provisioning Charging Number Mapping MGW SG/MGC F CSCF MRF HSS SIP, IP Control Layer AS SIP / OSA / CAMEL Application Layer IP/MPLSPSTN/PLMN GERAN, UTRAN, WLAN, xDSL,... Connectivity & Access Layer IMS Architecture

7. IMS Horizontal Architecture

8. 8 IMS Protocols IP UDPTCP SIP RSVPRTPRTCP SAP SDP Multimedia Applications Audio Video Dados  IMS uses IETF protocols wherever possible.  Session Control  SIP  Media  RTP and RTCP  Security  Diameter (AAA)  GSM, GPRS and 3G standards

9. IMS Services  On the operator’s network  Horizontal architecture  On the mobile device  Client-server Architecture  Three-layer Application Architecture  From the mobile terminal down to the content providers developers  Various application domains

10. Problems and open issues  Architecture complexity.  IETF and 3GPP standardisation co-operation.  SIP and IMS architecture are not mature enough to guarantee fully functioning network.  Terminal complexity.

11. There is still work to be done....  The current work in 3GPP is still unfinished and the discussion with IETF has just been started.  The specification work still continue now.

12. References  [1]V. Koukoulidis and M. Shah, The IP Multimedia Domain in Wireless Networks: Concepts, Architecture, Protocols and Applications, Siemens Information and Communication Mobile, Boca Raton, Fl, Proceedings of the IEEE Sixth International Symposium on Multimedia Software Engineering (ISMSE’04), IEEE, 2004.  [2] 3GPP Homepage, http://www.3gpp.org/specs/specs.htmhttp://www.3gpp.org/specs/specs.htm  [3]IP Multimedia Subsystem (IMS): Service Architecture, Lucent Technologies, February, 2005,

13. References  [4] The Protocol Dictionary Homepage, http://www.javvin.com/protocolH245.html http://www.javvin.com/protocolH245.html  [5]Session Initiation Protocol Charter Homepage, http://www.ietf.org/html.charters/sip-charter.html http://www.ietf.org/html.charters/sip-charter.html  [6] IETF RFC 3261: "SIP: Session Initiation Protocol"

14. THANK YOU