Methods and apparatuses for measuring frequencies of basestations in cellular networks using mobile GPS receivers
First Claim
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 that is generated by a local oscillator of the mobile station based on the at least one satellite positioning system signal;
receiving, at the mobile station, a first cellular signal from the basestation, the first cellular signal being modulated upon a carrier;
measuring a frequency of the carrier using the reference signal from the local oscillator; and
determining a first frequency related to the basestation using the frequency of the carrier.
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Accused Products
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.
55 Citations
33 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 mobile station, at least one satellite positioning system signal; determining a frequency of a reference signal that is generated by a local oscillator of the mobile station based on the at least one satellite positioning system signal; receiving, at the mobile station, a first cellular signal from the basestation, the first cellular signal being modulated upon a carrier; measuring a frequency of the carrier using the reference signal from the local oscillator; and determining a first frequency related to the basestation using the frequency of the carrier. - View Dependent Claims (2, 3, 4, 33)
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5. A system to measure a frequency related to a basestation, the system comprising:
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a mobile station, the mobile station comprising; a cellular transceiver configured to receive from the basestation a cellular signal modulated upon a carrier; 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 circuit coupled to the cellular receiver and the satellite positioning system receiver, the circuit configured to determine a frequency of the carrier from the frequency of the reference signal. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. An apparatus to measure a frequency related to a basestation of a cellular communication system, the apparatus comprising:
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means for receiving, at a mobile station, at least one satellite positioning system signal; means for determining a frequency of a reference signal that is generated by a local oscillator of the mobile station based on the at least one satellite positioning system signal; means for receiving, at the mobile station, a first cellular signal from the basestation, the first cellular signal being modulated upon a carrier; means for measuring a frequency of the carrier using the reference signal from the local oscillator; and means for determining a first frequency related to the basestation using the frequency of the carrier. - View Dependent Claims (13, 14, 15)
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16. A machine-readable media containing program code which when executed by a processor cause a machine to measure a frequency related to a basestation of a cellular communication system, the machine-readable media comprising:
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program code to receive, at a mobile station, at least one satellite positioning system signal; program code to determine a frequency of a reference signal that is generated by a local oscillator of the mobile station based on the at least one satellite positioning system signal; program code to receive, at the mobile station, a first cellular signal from the basestation, the first cellular signal being modulated upon a carrier; program code to measure a frequency of the carrier using the reference signal from the local oscillator; and program code to determine a first frequency related to the basestation using the frequency of the carrier. - View Dependent Claims (17, 18, 19)
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20. An apparatus to measure a frequency related to a basestation of a cellular communication system, the apparatus comprising:
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a communication transceiver configured to receive from the basestation a signal modulated upon a carrier; a local oscillator coupled to the communication transceiver and configured to provide a reference signal to the communication transceiver; 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 configured to determine a frequency of a satellite positioning system frequency reference based in part on the at least one satellite positioning system signal; and a circuit coupled to the communication transceiver and the satellite positioning system receiver, the circuit configured to determine a frequency of the carrier based in part on the frequency of the satellite positioning system frequency reference. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification