Patent ID: 6356763
Filing Date: 2002-03-12
Classification: G01S,H04W

Abstract:
A method of using a mobile communication station in a wireless communication network to measure respective times of arrival of Code Division Multiple Access (CDMA) radio signals respectively transmitted by at least two radio transmitters in the network, said method comprising the steps of:providing the mobile communication station with real time difference information indicative of differences between a time base used by a radio transmitter serving the mobile communication station and respective time bases used by the other radio transmitters; providing the mobile communication station with information indicative of spreading codes used by the radio transmitter serving the mobile communication station and the other radio transmitters; the mobile communication station determining, in response to the real time difference information and relative to the time base used by the radio transmitter serving the mobile communication station, a plurality of points in time at which the respective CDMA radio signals are expected to arrive at the mobile communication station; determining, by the mobile communication station, the spreading codes used by the radio transmitter serving the mobile communication station, from the information indicative of the spreading codes; and for each CDMA radio signal, the mobile communication station monitoring, using the spreading codes, for arrival of the CDMA radio signal during a period of time after said point in time at which the CDMA radio signal is expected to arrive.