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Enhancing A-GPS Location Accuracy and Yield With Location Measurement Units and Network Timing Measurements

  • US 20130122929A1
  • Filed: 11/16/2012
  • Published: 05/16/2013
  • Est. Priority Date: 11/16/2011
  • Status: Active Grant
First Claim
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1. A method of determining the location of a mobile device comprising the steps of:

  • (a) requesting by a node one or more location measurement units (LMUs) to provide timing relationship information from a respective cell site in a communications network;

    (b) tasking the one or more LMUs to measure uplink times of arrival of signals received by the LMUs from a target mobile device;

    (c) receiving a response message from the target mobile device, the response message having reference epoch frame information;

    (d) determining a Global Positioning System (GPS) time estimate at the reference epoch that the target mobile device used to make GPS satellite measurements, wherein the determination is performed as a function of the requested LMU timing relationship information;

    (e) determining satellite information using the determined GPS time estimate; and

    (f) determining a location of the mobile device as a function of the determined satellite information.

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