Patent ID: 6687501
Filing Date: 2004-02-03
Classification: H04W

Abstract:
A method for calibrating timing of base station in a wireless communication system, comprising:determining location information of a wireless communication device; calculating a line-of-sight delay corresponding to a line-of-sight distance between said wireless communication device and said base station, said line-of-sight distance based on base station location information and said wireless communication device location information; detecting an arrival time of a first signal transmitted from said base station to said wireless communication device; measuring a round trip delay corresponding to a delay incurred by said first signal and a delay incurred by a second signal transmitted from said wireless communication device back to said base station in response to said first signal; determining a base station timing calibration error based on said line-of-sight delay, said first signal arrival time, and said round trip delay; and calibrating said base station timing to compensate for said base station timing calibration error; wherein said line-of-sight delay is determined by the following relationship: Î”los=(xb-xw)2+(yb-yw)2+(zb-zw)2cwhere: &Dgr;los represents the line-of-sight delay, xb, yb, and Zb represent coordinate information identifying the base station location information, xw, yw, zw represent coordinate information identifying the wireless communication device location information, and c represents the speed of light.