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

Telecommunications – Radiotelephone system – Zoned or cellular telephone system

Reexamination Certificate

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Details

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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