Methods and apparatuses for measuring frequencies of basestations in cellular networks using mobile GPS receivers
DCFirst Claim
1. A method to measure a frequency related to a basestation of a cellular communication system, the method comprising:
- receiving, at a first mobile station, a first cellular signal from the basestation, the first cellular signal containing a first timing marker;
determining a first time tag for the first timing marker from at least one satellite positioning system signal received at the first mobile station;
determining a first location of the first mobile station from at least one satellite positioning system signal received at the first mobile station;
transmitting, through a cellular communication link, the first time tag and the first location to a server;
receiving, at a second mobile station, a second cellular signal from the basestation, the second cellular signal containing a second timing marker;
determining a second time tag for the second timing marker from at least one satellite positioning system signal received at the second mobile station;
determining a second location of the second mobile station from at least one satellite positioning system signal received at the second mobile station;
transmitting, through a cellular communication link, the second time tag and the second location to the cellular network entity; and
combining a location of the basestation with the first and second time tags and the first and second locations to compute a first frequency related to the basestation.
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Abstract
Methods and apparatuses for frequency synchronizing basestations in a cellular communication system. In one aspect of the invention, a method to predict a timing of transmission of a basestation in a cellular communication system includes: receiving a first time tag for a first timing marker in a first cellular signal transmitted from the basestation; receiving a second time tag of a second timing marker in a second cellular signal transmitted from the basestation; and computing a frequency related to the basestation using the first and second time tags. Each of the time tags are determined using at least one satellite positioning system signal received at a mobile station which receives the corresponding time marker.
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Citations
20 Claims
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1. A method to measure a frequency related to a basestation of a cellular communication system, the method comprising:
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receiving, at a first mobile station, a first cellular signal from the basestation, the first cellular signal containing a first timing marker;
determining a first time tag for the first timing marker from at least one satellite positioning system signal received at the first mobile station;
determining a first location of the first mobile station from at least one satellite positioning system signal received at the first mobile station;
transmitting, through a cellular communication link, the first time tag and the first location to a server;
receiving, at a second mobile station, a second cellular signal from the basestation, the second cellular signal containing a second timing marker;
determining a second time tag for the second timing marker from at least one satellite positioning system signal received at the second mobile station;
determining a second location of the second mobile station from at least one satellite positioning system signal received at the second mobile station;
transmitting, through a cellular communication link, the second time tag and the second location to the cellular network entity; and
combining a location of the basestation with the first and second time tags and the first and second locations to compute a first frequency related to the basestation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system to measure a frequency related to a basestation, the system comprising:
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a first mobile station comprising;
a first satellite positioning system receiver configured to receive a first at least one satellite positioning system signal and to determine a first location of the first mobile station from the first at least one satellite positioning system signal; and
a first cellular transceiver coupled to the first satellite positioning system receiver, the first cellular transceiver receiving from the basestation a first cellular signal containing a first timing marker; and
a first circuit coupled to the first cellular receiver and the first satellite positioning system receiver, the first circuit determining a first time tag for the first timing marker using the first at least one satellite positioning system signal;
a second mobile station comprising;
a second satellite positioning system receiver configured to receive a second at least one satellite positioning system signal and to determine a second location of the second mobile station from the second at least one satellite positioning system signal; and
a second cellular transceiver coupled to the second satellite positioning system receiver, the second cellular transceiver receiving from the basestation a second cellular signal containing a second timing marker; and
a second circuit coupled to the second cellular receiver and the second satellite positioning system receiver, the second circuit determining a second time tag for the second timing marker using the second at least one satellite positioning system signal; and
a server coupled to the first and second mobile stations through communication links, the first cellular transceiver transmitting the first time tag and the first location to the server through a communication link, the second cellular transceiver transmitting the second time tag and the second location to the server through a communication link, the server combining a location of the basestation with the first and second time tags and the first and second locations to compute a first frequency related to the basestation. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification