Supporting Proactive Location-Aware Services in Cellular Networks
Location-aware services (LAS) adapt content and service execution to the user’s current physical location. In today’s cellular networks, only reactive LASs are offered. The user has to explicitly request the service before the network determines her current location and starts service execution. However, in the future the user would like to see proactive LASs, which are automatically triggered as soon as she enters a pre-defined point of interest. In contrast to reactive LASs, this requires that the network performs a continuous user tracking, which entails expensive point-to-point signaling at the air interface.
However, proactive LASs can be supported more efficiently if the mobile terminal locates itself. The terminal can derive its own location by processing location information which is broadcasted by the network or by a dedicated localization infrastructure like GPS. The network does not need to know where the user is, unless she has entered a point of interest. This paper follows this idea and presents the Location-Aware Mobility Architecture (LAMA), a platform for deriving and processing location information at the mobile terminal.
KeywordsGlobal Position System Cellular Network Mobile Terminal Tracker Controller General Packet Radio Service
- 1.Fischmeister, S., Menkhaus, G.: The Dilemma of Cell-based Proactive Location- Aware Services. Technical Report TR-C042, Software Research Lab, University of Constance (2002)Google Scholar
- 2.Klinec, D., Volz, S.: NEXUS – Positioning and Communication Environment for Spatially Aware Applications. In: International Archives of Photogrammetry and Remote Sensing, Amsterdame, Netherlands. Inter-Technical Commission, IC 10, vol. XXXIII (2000)Google Scholar
- 3.Popischil, G., Stadler, J., Miladinovic, I.: A Location-based Push Architecture using SIP. In: Proceedings of the 4th International Symposium on Wireless Personal Multimedia Communications (WPMC 2001), Aalborg, Denmark (2001)Google Scholar
- 4.3GPP TS 02.71: Location Services; Service Description, Stage 1 (2001)Google Scholar
- 5.3GPP TS 03.71: Location Services; Functional Description, Stage 2 (2002)Google Scholar
- 6.3GPP TS Group Terminals 03.41: Technical Realization of Cell Broadcast Service, CBS (1998)Google Scholar
- 7.Tabbane, S.: Location Management Methods for Third-Generation Mobile Systems. IEEE Communications Magazine, 72–84 (1997)Google Scholar
- 9.3GPP TS Group Terminals 07.07: AT Command Set for GSM Mobile Equipment, ME (1998)Google Scholar
- 11.Want, R., Hopper, A., Falcao, V., Gibbons, J.: The Active Badge Location System. ACM Transactions on Information Systems, 91–102 (1992)Google Scholar
- 12.Davies, N., Cheverst, K., Mitchell, K., Efrat, A.: Using and Determining Location in a Context-Sensititve Tour Guide. IEEE Computer, 35–41 (2001)Google Scholar