Methods and apparatuses for measuring frequencies of basestations in cellular networks using mobile GPS receivers
AssigneeQUALCOMM Incorporated
InventorNorman F. Krasner
Life of this patent
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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.
Claims9
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.
A system to measure a frequency related to a basestation, the system comprising:
- a mobile station comprising:
- a cellular transceiver configured to receive from the basestation a cellular signal containing a first timing marker and a second timing marker;
- a local oscillator generating a reference signal;
- a satellite positioning system receiver coupled to the local oscillator, the satellite positioning system receiver configured to receive at least one satellite positioning system signal and to determine a frequency of the reference signal from the at least one satellite positioning system signal;
- and
- a processor coupled to the cellular receiver and the satellite positioning system receiver, the processor configured to determine a first time tag for the first timing marker and a second time tag for the second timing marker using the reference signal and to combine the frequency of the reference signal with the first and second time tags to compute a first frequency related to the basestation.
Dependencies are inferred from the claim text.