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Frequency Band Selection Methods and Apparatus

  • US 20090156206A1
  • Filed: 12/18/2007
  • Published: 06/18/2009
  • Est. Priority Date: 12/18/2007
  • Status: Abandoned Application
First Claim
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1. A method of determining a frequency band in which to search for a cell in a communication system having plural cells, wherein the method is carried out in a user equipment (UE) in the communication system, and comprises the steps of:

  • checking for a cell at a frequency in a frequency band, the frequency being a frequency on which the UE previously had service from the communication system;

    if a cell is not found at the frequency, carrying out the steps of;

    determining a current location indicator, wherein determining the current location indicator comprises;

    either determining a current location based on signals transmitted in a global positioning system, orretrieving a stored time indicator that indicates a time at which the UE previously had service and a stored location indicator that indicates a location of the UE at the time at which the UE previously had service, determining an elapsed time since the time at which the UE previously had service, and determining at least one possible location based on the elapsed time and a set of shortest flying times from the location of the UE at the time at which the UE previously had service; and

    determining at least one frequency band in which to search for a cell based on the current location indicator.

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