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Asynchronous wireless communication system

  • US 9,250,311 B2
  • Filed: 01/09/2010
  • Issued: 02/02/2016
  • Est. Priority Date: 01/22/2009
  • Status: Active Grant
First Claim
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1. A method comprising:

  • obtaining, by a device, an initial set of estimates of differences between base station timing offsets for a pair of base stations;

    obtaining, by the device, measurements of a timing of first signals received by a wireless communication unit from the pair of base stations;

    using, by the device, the measurements to derive a first location estimate of the wireless communication unit;

    obtaining, by the device, a first current confidence score for the first location estimate;

    estimating, by the device, a difference in first path lengths for second signals and a difference in second path lengths for third signals received, by the wireless communication unit, from at least one of;

    another pair of base stations, oranother wireless communication unit;

    determining, by the device and using the estimated difference in the first path lengths and the estimated difference in the second path lengths, a second location estimate of the wireless communication unit;

    using, by the device, the second location estimate to create a revised, estimated difference in the first path lengths and a revised, estimated difference in the second path lengths;

    using, by the device, the first location estimate, the revised, estimated difference in the first path lengths, and the revised, estimated difference in the second path lengths, to produce a revised set of estimates of differences;

    weighting, by the device, the revised set of estimates of differences based on the first current confidence score and a second current confidence score,the second current confidence score being associated with the second location estimate; and

    using, by the device, the weighted, revised set of estimates of differences to refine the initial set of estimates of differences.

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