Estimating GPS time at cellular terminals based on timing of...

Details Estimating GPS time at cellular terminals based on timing of... Estimating GPS time at cellular terminals based on timing of...

2008-01-22

2008-01-22

Maung, Nay (Department: 2618)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S012100, C455S013200, C455S003020, C455S502000, C455S503000, C342S358000, C342S357490, C701S213000, C701S214000

Reexamination Certificate

active

07321776

ABSTRACT:
A mobile terminal generates an estimate of GPS time. The mobile terminal includes a cellular receiver, a GPS receiver, and a processor. The cellular receiver is configured to receive communication signals from cells in a wireless communication system. The GPS receiver receives GPS signals and determines a GPS time reference therefrom. The processor estimates a cell time reference from the received communication signals, and generates cell-to-GPS timing data that represents a time offset between the cell time reference and the GPS time reference. The processor then estimates GPS time based on a time indicator portion of a received communication signal and the cell-to-GPS timing data. The estimated GPS time may be used by the GPS receiver to acquire GPS signals.

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Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, or the Declaration, PCS/US2004,016457, NOv. 29, 2004.

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