Methods and apparatuses for measuring frequencies of...

Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers

Reexamination Certificate

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Details

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

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