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AGPS MODULE TIME SYNCHRONIZATION METHOD AND DEVICE USING SYSTEM TIME INFORMATION IN MOBILE TERMINAL

  • US 20070213931A1
  • Filed: 10/13/2006
  • Published: 09/13/2007
  • Est. Priority Date: 03/07/2006
  • Status: Active Grant
First Claim
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1. A method for synchronizing Assisted Global Positioning System (AGPS) module time using system time information in an asynchronous mobile terminal, the method comprising:

  • receiving a message having a time stamp for a referential system frame number contained therein from a system;

    generating a Global Positioning System (GPS) module operation period to generate a GPS tick every period and to synchronize an initially generated GPS tick with a boundary of a system frame period;

    identifying a time point when a GPS tick interrupt and a system frame correspond to each other after synchronization, and imparting a number to each phase interval in which an interval until a corresponding time point is divided by the system frame period; and

    reading the system frame and the phase interval number of a generation time point when a predetermined GPS tick is generated to identify a system time of the GPS tick generation time point.

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