Patent ID: 7283787

Claim:
A method for positioning a mobile station including a repeater comprising a cell identifier generator module in a downlink circuit structure of the repeater, wherein the cell identifier generator module comprises: a synchronization searching unit for searching for a base station pilot signal; a time delay unit for generating a fixed delay according to the searching result from the synchronization searching unit; and a cell identifier signal generating unit for generating a cell identifier signal; wherein is a delay between a frame start time of the base station pilot signal and a frame start time of the cell identifier signal is the fixed delay; the method comprising the steps of: (1) issuing the cell identifier signal, the fixed delay, and a search window width from the repeater in response to a positioning request from the mobile station, wherein the cell identifier signal is searched in a time range defined by the search window width and the fixed delay; (2) measuring a Time Difference Of Arrival (TDOA) between the cell identifier signal and the base station pilot signal and reporting the measured TDOA, by the mobile station; (3) determining whether the value of TDOA equals to the fixed delay; if so, going to step (4); otherwise going to step (7); (4) measuring a Time Of Arrival (TOA), TOA m , from the mobile station to the base station through the repeater; (5) determining a value of TOA trans with the formula: TOA trans =TOA m −TOA c , wherein the TOA trans means TOA from the mobile station to the repeater, and the TOA c , means a calibrated TOA from the repeater to the base station; (6) calculating the distance between the mobile station and the repeater through multiplying TOA trans with light velocity; and (7) determining the position of the mobile station.