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System and method of dynamically calibrating based station timing using location information

  • US 6,687,501 B2
  • Filed: 07/20/2001
  • Issued: 02/03/2004
  • Est. Priority Date: 10/10/2000
  • Status: Expired due to Term
First Claim
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1. A method for calibrating timing of base station in a wireless communication system, comprising:

  • determining location information of a wireless communication device;

    calculating a line-of-sight delay corresponding to a line-of-sight distance between said wireless communication device and said base station, said line-of-sight distance based on base station location information and said wireless communication device location information;

    detecting an arrival time of a first signal transmitted from said base station to said wireless communication device;

    measuring a round trip delay corresponding to a delay incurred by said first signal and a delay incurred by a second signal transmitted from said wireless communication device back to said base station in response to said first signal;

    determining a base station timing calibration error based on said line-of-sight delay, said first signal arrival time, and said round trip delay; and

    calibrating said base station timing to compensate for said base station timing calibration error;

    wherein said line-of-sight delay is determined by the following relationship;

    Δ

    los
    =(xb-xw)2+(yb-yw)2+(zb-zw)2c
    embedded imagewhere;

    Δ

    los represents the line-of-sight delay, xb, yb, and Zb represent coordinate information identifying the base station location information, xw, yw, zw represent coordinate information identifying the wireless communication device location information, and c represents the speed of light.

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