Patent ID: 7620403
Filing Date: 2009-11-17
Classification: G01S,H04B,H04W

Abstract:
1. A method of acquiring a positioning signal from a global positioning satellite at a positioning receiver of an uncorrected mobile communication device, comprising: detecting, by a communications transceiver of the uncorrected mobile communication device, a signal transmitted by a corrected mobile communication device, the signal being at an uncorrected nominal frequency of the corrected mobile communication device, the uncorrected nominal frequency being offset from a nominal frequency due to a frequency error of the corrected mobile communication device, the communications transceiver being operable to facilitate direct, peer-to-peer communication between the uncorrected mobile communication device and the corrected mobile communication; tuning the communications transceiver of the uncorrected mobile communication device to the uncorrected nominal frequency of the corrected mobile communication device from an uncorrected nominal frequency of the uncorrected mobile communication device; determining, by the uncorrected mobile communication device, a tuning offset between the uncorrected nominal frequency of the uncorrected mobile communication device and the uncorrected nominal frequency of the corrected mobile communication device; receiving a frequency correction message at the uncorrected mobile communication device from the corrected mobile communication device at the uncorrected nominal frequency of the corrected mobile communication device, the frequency correction message including reference oscillator offset information of the corrected mobile communication device; extracting the reference oscillator offset information of the corrected mobile communication device from the frequency correction message at the uncorrected mobile communication device; comparing the reference oscillator offset information of the corrected mobile communication device and the tuning offset to determine a reference offset of a reference oscillator of the uncorrected mobile communication device from the nominal frequency; providing the reference offset of the reference oscillator of the uncorrected mobile communication device to the positioning receiver of the uncorrected mobile communication device, the positioning receiver sharing the reference oscillator with the communications transceiver; and adjusting a positioning receiver tuning in response to the reference offset to receive the positioning signal.