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System and method for locating UMTS user equipment using measurement reports

  • US 8,447,319 B2
  • Filed: 04/16/2008
  • Issued: 05/21/2013
  • Est. Priority Date: 11/15/2007
  • Status: Expired due to Fees
First Claim
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1. A method for estimating a location of a wireless device receiving signals from a plurality of nodes of a communication system, the method comprising:

  • (a) determining a first value based on a network timing characteristic for one of said nodes;

    (b) determining a second value based on a network measurement report characteristic;

    (c) calculating an observed time difference of arrival (“

    OTDOA”

    ) hyperbola based on said first and second values; and

    (d) estimating a location of said wireless device as a function of said OTDOA hyperbola,wherein said plural nodes include a serving node and a neighboring node and wherein the calculating of the OTDOA includes using a second value determined from a difference between a connection frame number (“

    CFN”

    ) of said serving node and a system frame number (“

    SFN”

    ) of said neighboring node, andwherein the estimating of the location of said wireless device includes determining a third value selected from the group consisting of;

    a round trip time (“

    RTT”

    ) value, a cell identification value, a signal strength value, and combinations thereof.

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