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Locally adjusted radio frequency coverage maps in wireless networks

  • US 7,904,092 B2
  • Filed: 01/04/2007
  • Issued: 03/08/2011
  • Est. Priority Date: 01/04/2007
  • Status: Active Grant
First Claim
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1. One or more non-transitory, computer-readable storage media embodying software operable when executed by one or more computer systems to:

  • receive calibration data comprising one or more observed received signal strength values corresponding to a radio frequency transmitter, each of the observed received signal strength values being received at one of one or more calibration points, each of the calibration points residing in one of one or more location bins;

    identify an applicable coverage map, the coverage map providing, for the radio frequency transmitter, one or more estimated received signal strength values, each of the estimated received signal strength values being estimated for one of the location bins;

    determine one or more offset values, each of the offset values being determined for one of the calibration points based on a difference between the observed received signal strength value—

    received at the calibration point and the estimated received signal strength value estimated for the location bin in which the calibration point resides;

    define one or more correction cones, each of the correction cones being defined for one of the calibration points with its base centered at the calibration point, its height correlating to the offset value for the calibration point, and intersecting one or more of the location bins, for each of the location bins intersecting the base of the correction cone, a first height measured from a center of the location bin to a lateral surface of the correction cone correlating to a correction value for the location bin that is a percentage of the offset value for the calibration point at the center of the base of the correction cone, the percentage being calculated based on the first height and a second height measured from the center of the base of the correction cone to an apex of the correction cone; and

    adjust the estimated received signal strength value at each of the location bins based on the correction value for the location bin.

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