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Estimating whether or not a wireless terminal is in a zone using radio navigation

  • US 8,320,933 B2
  • Filed: 02/28/2007
  • Issued: 11/27/2012
  • Est. Priority Date: 02/28/2007
  • Status: Active Grant
First Claim
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1. A method comprising:

  • generating a computer-executable program based on a database that comprises;

    (i) a first expected value of an electromagnetic trait of a first signal in a first location, and(ii) a second expected value of the electromagnetic trait of a second signal in a second location;

    transmitting the computer-executable program to a wireless terminal for execution on the wireless terminal; and

    installing the computer-executable program on a subscriber identity module on the wireless terminal;

    wherein the computer-executable program estimates whether or not the wireless terminal is present in a zone without accessing the database, and based on a measured value of the electromagnetic trait of the first signal; and

    wherein the zone comprises the first location and the second location.

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