Naslov
Conveying and Handling Location Information in the IP Multimedia Subsystem

Autori
Mošmondor, Miran ; Skorin-Kapov, Lea ; Filjar, Renato ; Matijašević, Maja

Izvornik
Journal of Communications Software and Systems (1845-6421) 2 (2006), 4; 313-321

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
IP multimedia subsystem; location; mobile positioning; signaling; SIP; IMS

Sažetak
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 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. In order to demonstrate proof-of-concept in enhancing IMS-based services, two service scenarios have been implemented: Location-aware Messaging (LaM), and Location-aware Push-to-Talk (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).

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika, Računarstvo

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