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Methods and apparatuses for measuring frequencies of basestations in cellular networks using mobile GPS receivers

  • US 7,024,215 B2
  • Filed: 07/21/2005
  • Issued: 04/04/2006
  • Est. Priority Date: 04/15/2002
  • Status: Expired due to Term
First Claim
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1. A method to measure a frequency related to a basestation of a cellular communication system, the method comprising:

  • receiving, at a mobile station, at least one satellite positioning system signal;

    determining a frequency of a reference signal from a local oscillator of the mobile station from the at least one satellite positioning system signal;

    receiving, at the mobile station, a first cellular signal from the basestation, the first cellular signal containing a first timing marker and a second timing marker;

    determining a first time tag for the first timing marker and a second time tag for the second timing marker, using the reference signal from the local oscillator; and

    combining the frequency of the reference signal from the local oscillator with the first and second time tags to compute a first frequency related to the basestation.

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