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Method and apparatus for location finding in a CDMA system

  • US 5,736,964 A
  • Filed: 02/16/1996
  • Issued: 04/07/1998
  • Est. Priority Date: 05/08/1995
  • Status: Expired due to Term
First Claim
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1. A method for determining the location of a subscriber unit in a wireless communication system, the method comprising the steps of:

  • sending a first signal including a location request from a first base station to the subscriber unit;

    receiving a second signal including a response message from the subscriber unit, the response message comprising a receive time of the first signal and a transmit time of the second signal;

    receiving a predetermined symbol associated with the second signal at the first base station and a second base station, and determining a first and a second receive time of the predetermined symbol at the first and second base station, respectively; and

    determining a location of the subscriber unit from the receive time of the first signal by the subscriber unit, the transmit time of the second signal by the subscriber unit, the first and second receive times of the predetermined symbol, and from predetermined information about the first and second base stations.

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