Location Conveyance in the IP Multimedia Subsystem

  • Miran Mosmondor
  • Lea Skorin-Kapov
  • Renato Filjar
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4003)


The 3rd Generation Partnership Project (3GPP) has proposed the IP Multimedia Subsystem (IMS) as a key element in the next-generation network (NGN) converged architecture supporting multimedia services. Extending the IMS towards provisioning support for location based services (LBS) will enable enhanced services and offer new revenues to the system. However, conveying location information in the IMS and connecting the IMS with a real positioning system are still open issues. This paper presents the design and implementation of an IMS Location Server (ILS) integrating IMS with a positioning system. From the IMS perspective, the ILS serves as a service enabler for LBS. Considerable work has been done by the IETF in the area of location information transport based on the Session Initiation Protocol (SIP). This paper proposes some improvements in this area. In order to demonstrate proof-of-concept in enhancing IMS-based services, a Location-aware Push-to-Talk (LaPoC) prototype service has been developed. The service has been integrated and tested with the Ericsson Mobile Positioning System (MPS). The paper also gives the results of performance measurements including traffic load analysis and session establishment time.


Session Initiation Protocol Home Subscriber Server Session Initiation Protocol Message Session Establishment Location Request 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. 1.
    3GPP TS 23.228: IP Multimedia Subsystem (IMS); Stage 2. Rel. 7, 2005-06 (2005)Google Scholar
  2. 2.
    3GPP TS 23.271: Functional stage 2 description of Location Services (LCS). Release 7, 2005-03 (2005)Google Scholar
  3. 3.
    Open Mobile Alliance OMA-AD_PoC-V1_0-20051104-C: Push to talk over Cellular (PoC) - Architecture. Candidate Version 1.0 (November 2005)Google Scholar
  4. 4.
    Open Mobile Alliance OMA-LIF-MLP-V3_1-20040316-C: Mobile Location Protocol (MLP). Candidate Version 3.1 (March 2004)Google Scholar
  5. 5.
    OpenGIS: Open Geography Markup Language (GML) Implementation Specification. OGC 02-023r4 (January 2003),
  6. 6.
    Ericsson Corp: About IMS and Push-to-talk over Cellular (January 2006), Accessed at:
  7. 7.
    Ericsson Corp: Mobile Positioning System (January 2006), Accessed at:
  8. 8.
    Camarillo, G., Garcia-Martin, M.: The 3G IP Multimedia Subsystem: Merging the Internet and the Cellular Worlds. John Wiley and Sons, Ltd., England (2004)CrossRefGoogle Scholar
  9. 9.
    Filjar, R., Huljenic, D., Desic, S.: Distributed Positioning: A Network-based Method for Satellite Positioning Performance Improvement. Journal of Navigation 55(3), 477–484 (2002)CrossRefGoogle Scholar
  10. 10.
    Filjar, R., Desic, S., Trzec, K.: LBS Reference Model. In: Proc. of NAV 2004 Conference, Westminster, London, UK (2004) (on CD-ROM)Google Scholar
  11. 11.
    Mahy, R.: A Document Format for Filtering and Reporting Location Notications in PIDF-LO. draft-mahy-geopriv-loc-filters-00.txt, Internet Draft, October 2005, work in progress (2005)Google Scholar
  12. 12.
    Peterson, J.: A Presence-based GEOPRIV Location Object Format. IETF RFC 4119 (December 2005)Google Scholar
  13. 13.
    Polk, J.M., Rosen, B.: Session Initiation Protocol Location Conveyance. draft-ietf-sip-location-conveyance-01.txt, Internet Draft, July 2005, work in progress (2005)Google Scholar
  14. 14.
    Roach, A.B.: Session Initiation Protocol (SIP)-Specific Event Notification. IETF RFC 3265 (June 2002)Google Scholar
  15. 15.
    Rosenberg, J., et al.: SIP: Session Initiation Protocol. IETF RFC 3261 (June 2002)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Miran Mosmondor
    • 1
  • Lea Skorin-Kapov
    • 1
  • Renato Filjar
    • 1
  1. 1.Research and Development CenterEricsson Nikola TeslaZagrebCroatia

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