Estimating GPS time at cellular terminals based on timing of information from base stations and satellites
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United States of America Patent
Stats
-
Jan 22, 2008
Grant Date -
Mar 31, 2005
app pub date -
Sep 25, 2003
filing date -
Sep 25, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
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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