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Journal of Communications Software and Systems, Vol.2 No.4 December 2006. -

The IP Multimedia Subsystem IMS, specified by the 3rd Generation Partnership Project 3GPP, is a key element in the next-generation network NGN converged architecture. Extending the IMS towards provisioning support for location based services LBS will enable enhanced services and offer new revenues to the operator. Conveying location information in the IMS and connecting the IMS with a 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. In order to demonstrate proof-of-concept in enhancing IMS-based services, two prototype service scenarios have been implemented: Location-aware Messaging LaM, and Location-aware Push-to-Talk over cellular LaPoC. Some work has been done by the IETF in the area of location information transport based on the Session Initiation Protocol SIP. This paper proposes improvements in this area, primarily related to reducing the necessary amount of signaling with the specification of a new type of location filter. We have conducted measurements in a laboratory environment in order to illustrate our proposed solution and verify the benefits compared to existing solutions in terms of traffic load and session establishment time. Furthermore, we present a case study integrating the ILS with the Ericsson Mobile Positioning System MPS.

Autor: Miran Mosmondor - ; Ericsson Nikola Tesla, Zagreb, Croatia Lea Skorin-Kapov - ; Ericsson Nikola Tesla, Zagreb, Croatia Renato Fil



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