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Estimating GPS time at cellular terminals based on timing of information from base stations and satellites

  • US 7,321,776 B2
  • Filed: 09/25/2003
  • Issued: 01/22/2008
  • Est. Priority Date: 09/25/2003
  • Status: Expired due to Fees
First Claim
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1. A method for estimating GPS time in a mobile terminal that operates in a wireless communication system, the method comprising:

  • generating at the mobile terminal a repository of cell-to-GPS timing data that is representative of a timing offset between GPS time and cell time for two or more cells with which the mobile terminal communicates;

    identifying an originating cell of a received communication signal from a base station;

    identifying timing advance data in the received communication signal, the timing advance data indicating distance between the mobile terminal and the base station;

    estimating GPS time using the repository of cell-to-GPS timing data, the identity of the originating cell, the timing advance data, and a time indicator portion of the received communication signal.

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