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Method and apparatus for locating a mobile station by comparing calculated location area with GPS coordinates

  • US 5,724,660 A
  • Filed: 02/20/1996
  • Issued: 03/03/1998
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. A method for locating a mobile telephone within the geographic serving area of a mobile telephone system, wherein said mobile telephone is capable of sending signals to and receiving signals from antennas located in cells within the geographic serving area, and wherein said mobile telephone comprises a GPS receiver/processor, the method comprising the steps of:

  • receiving signal strength data representing the signal strengths of signals being received by the mobile telephone from a first plurality of antennas;

    calculating a first location area of the mobile telephone as the geographic coverage area of a serving cell cite;

    calculating a second location area of the mobile telephone using said signal strength data;

    receiving GPS coordinates representing a GPS location of the mobile telephone; and

    comparing the first and second calculated location areas with the GPS location to determine the location of said mobile telephone.

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