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System and method for estimating cell center position for cell ID based positioning

  • US 8,165,607 B2
  • Filed: 12/22/2006
  • Issued: 04/24/2012
  • Est. Priority Date: 09/10/2001
  • Status: Active Grant
First Claim
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1. A method for estimating a cell location for a cell that provides wireless communication services to a plurality of mobile stations each mobile station having a Satellite Positioning System (“

  • SPS”

    ) receiver operating in a positioning system, the method comprising;

    obtaining a mobile station location for each of N mobile stations, where N is greater than 1, having a cell identifier that identifies the cell, each mobile station location being determined using the positioning system; and

    calculating an estimated location of a cell center based on a statistical measure of the mobile station location of the N mobile stations in the cell where the statistical measure is a maximum likelihood location,wherein calculating the estimated location of the cell center based on the maximum likelihood location further comprises;

    obtaining a variance, σ

    tj2, of a true position of the mobile station j relative to a true cell center position;

    obtaining an SPS variance, Vj, for each mobile station, j, in the cell,calculating a cell location variance, Vij, of a true position of each mobile station j in the cell relative to the estimated cell center location as a function of σ

    tj2 and Vj, andusing the variance, Vij, of each mobile station j of N to determine the maximum likelihood location.

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