Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2006-12-19
2006-12-19
Banks-Harold, Marsha D. (Department: 2686)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S404200, C342S450000, C340S988000
Reexamination Certificate
active
07151940
ABSTRACT:
The invention provides a method and apparatus for increasing the accuracy for locating a cellular mobile station in an urban area. The method is performed as follows: at first, if there is a request for location, the approximate position of a mobile station is determined by sector information, the time of arrival, and a time difference of arrival; then, the transmission of a locating pilot frequency for an adjacent assistant locating apparatus is initiated, and in the case of the transmission of the assistant locating pilot frequency, the time difference of arrival is measured once again; at the end of the measurement of the mobile station, the locating transmission of the assistant locating apparatus is closed; the assistant locating apparatus is requested to report the result of NLOS identification; with the measurement of the assistant locating pilot frequency by the mobile station and the result of NLOS identification, the position of the mobile station is estimated to acquire a more accurate position of the mobile station.
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International Search Report, no date listed.
N. J. Thomas et al., “A Robust Location Estimator Architecture with Biased Kalman Filtering of TOA Data for Wireless Systems”,Spread Spectrum Techniques and Applications,2000 IEEE Sixth International Symposium, Piscataway, NJ, USA, Sep. 6-8, 2000, pp. 296-300.
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Diao Xinxi
Duan Weiming
Li Gang
Wu Jiang
Banks-Harold Marsha D.
Crowell & Moring LLP
Huawei Technologies Co. Ltd.
Ly Nghi H.
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