E-GPS: Indoor Mobile Phone Positioning on GSM and W-CDMA

Peter J. Duffett-Smith and Ben Tarlow

Abstract:	Commercially successful location-based services using GPS deployed on mass-market mobile phones requires the provision of time aiding accurate at the microsecond level. Whilst relatively straight-forward to provide in CDMA and CDMA 2000 systems, which use network transmitters synchronised to GPS time, it is more difficult in GSM and W-CDMA systems in which the network transmitters are unsynchronised. We show how the Matrix positioning method may be combined with GPS to provide time aiding in any system, synchronised or not, and we describe the results of tests made on a GSM system which demonstrate how such fine time aiding affects the performance of a simple GPS receiver.
Published in:	Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005) September 13 - 16, 2005 Long Beach Convention Center Long Beach, CA
Pages:	2762 - 2768
Cite this article:	Duffett-Smith, Peter J., Tarlow, Ben, "E-GPS: Indoor Mobile Phone Positioning on GSM and W-CDMA," Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005), Long Beach, CA, September 2005, pp. 2762-2768.
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