Using a derived table of signal strength data to locate and track a user in a wireless network

  • US 6,839,560 B1
  • Filed: 02/25/2000
  • Issued: 01/04/2005
  • Est. Priority Date: 02/25/1999
  • Status: Active Grant
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First Claim
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1. A method for determining a location of a mobile unit, comprising:

  • measuring a wireless signal strength;

    comparing the measured wireless signal strength to a table of mathematically estimated wireless signal strengths and corresponding mobile unit locations;

    finding a table entry whose mathematically estimated wireless signal strength is closest, by distance in signal space, to the measured wireless signal strength; and

    determining the location of the mobile unit with reference to the found table entry;

    wherein the mathematical estimates of base station wireless signal strengths at the corresponding mobile unit locations are derived by performing steps comprising;

    determining an existing number of walls between the base station and the corresponding mobile unit locations; and

    determining a wall attenuation factor.

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