Time acquisition in a wireless position determination system

  • US 6,907,224 B2
  • Filed: 03/15/2002
  • Issued: 06/14/2005
  • Est. Priority Date: 03/15/2001
  • Status: Active Grant
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First Claim
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1. In a wireless communications system, a method for assisting a wireless device in acquiring satellite positioning system signals, comprising the following steps:

  • maintaining a timing source;

    continually receiving a reference signal;

    storing the reference signal, the stored reference signal having an associated time of reception that is measured by the timing source;

    receiving a request from the wireless, device for aiding information, the request including a signal snippet and a timestamp;

    matching the signal snippet to a portion of the stored reference signal;

    determining a time offset between the timestamp and the time of reception of the matched portion of the stored reference signal;

    preparing aiding information for the wireless device;

    synchronizing the aiding information to the wireless device using the time offset; and

    transmitting the synchronized aiding information to the wireless device.

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