Patent ID: 8027368

Claim:
A ranging method of an access terminal that requests a ranging from an access point through a wireless network and performs the ranging according to a response of the access point, the ranging method comprising: a) initializing a ranging period; b) setting a timer with the ranging period and starting the timer; c) requesting a ranging by transmitting a given ranging code from the access point based on radio resource allocation information provided by the access point when the timer is terminated and thus the ranging period has passed; d) receiving a ranging response message from the access point, and controlling transmission power, timing, and frequency offset of an access terminal according to transmission parameters included in the received ranging response message; e) estimating a downlink channel condition through which a signal from the access point is transmitted; f) resetting the ranging period according to the estimated downlink channel condition; and g) iteratively performing from b) to f) according to the reset ranging period.