Patent ID: 8611925

Claim:
A method of estimating a location of a subscriber, comprising: receiving a request for the location of the subscriber; identifying a serving base station associated with the subscriber; receiving a downlink frame from the serving base station; obtaining a time delay associated with a signal transmitted between the subscriber and the serving base station, the obtaining including estimating a time of arrival of the signal by extracting information from the received downlink frame, the extracting including, determining a channel impulse response associated with the downlink frame, and estimating the time of arrival by comparing a peak time of the determined channel impulse response with a start time associated with the downlink frame, the start time being estimated based on the channel impulse response exceeding a predetermined threshold value; estimating a distance between the subscriber and the serving base station based on the time delay; and estimating the location of the subscriber based on the estimated distance between the subscriber and the serving base station.