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

  • US RE46,501 E1
  • Filed: 11/20/2014
  • Issued: 08/01/2017
  • Est. Priority Date: 02/25/1999
  • Status: Active Grant
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 mathematically estimated signal strengths in the table are determined without measurement of wireless signal strength at the corresponding mobile unit locations.

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