Method and apparatus for assisted gps protocol

Details Method and apparatus for assisted gps protocol Method and apparatus for assisted gps protocol

H - Electricity

04

Q

H04Q 7/36 (2006.01) G01S 1/00 (2006.01) G01S 5/14 (2006.01) G01S 5/00 (2006.01)

Patent

CA 2325231

A cellular network protocol which minimizes the required data flow between the cellular infrastructure and each mobile handset supporting a GPS based positioning capability is taught. Four specific innovations are introduced which together minimize the number of bits required to be transferred to each handset: a method for reducing or removing the requirement for GPS ephemeris updates to each mobile; a method for compression of the differential correction broadcast message; a method for controlling the rate at which the network updates each handset's ephemeris based on an ephemeris age limit; and, finally, a method which each mobile can use to determine when an ephemeris update is needed, based on an accuracy prediction and a threshold which is unique to each mobile.

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