Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
2006-04-04
2006-04-04
Eng, George (Department: 2688)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S456100, C342S357490, C370S503000, C370S350000
Reexamination Certificate
active
07024215
ABSTRACT:
Methods and systems for frequency synchronizing base stations in a cellular communication system. In one aspect of the invention, a method to measure a frequency related to a base station of a cellular communication system includes receiving a satellite positioning system signal; determining a frequency of a reference signal from a local oscillator of a mobile station from the satellite position system signal; receiving a first cellular signal from a base station containing first and second timing markers; determining first and second time tags for the markers using the reference signal; and combining the frequency of the reference signal and the first and second time tags to compute a first frequency related to the base station.
REFERENCES:
patent: 6424826 (2002-07-01), Horton et al.
patent: 6839547 (2005-01-01), Nir et al.
patent: 2004/0198394 (2004-10-01), Syrjarinne et al.
patent: WO 99/50985 (1999-10-01), None
Eng George
Greenhaus Bruce W.
Mays Andrea L.
Qualcomm Incorporated
Stein Julie E.
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