US 8,027,368 B2 · Terminal in wireless communication system and ranging method for dynamically changing ranging period thereof

Abstract

A ranging method of an access terminal that requests a ranging to an access point through a wireless network and performs the ranging, the ranging method including 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 to the access point based on radio resource allocation information provided by the access point, 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 b) to f) according to the reset ranging period.

Claims12

Dependent claims

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.

5 more elements

An access terminal requesting a ranging from an access point through a wireless network, and performing the ranging according to a response of the access point, the access terminal comprising:

a transmitting/receiving device transmitting a signal to and receiving a signal from the access point through the wireless network;
a ranging request and response processor requesting ranging by transmitting a ranging code from the access point through the transmitting/receiving device, and controlling at least one of transmission power, timing, and frequency offset of an uplink of the access terminal based on transmission parameters included in a ranging response message transmitted from the access point in response to the request;
a downlink condition estimator estimating a condition of a downlink channel based on the signal received from the access point;
and
a ranging period setting unit resetting a ranging period based on the estimated condition of the downlink channel,
wherein the ranging request and response processor requests a ranging from an access point according to the reset ranging period.

3 more elements

Dependencies are inferred from the claim text.

Terminal in wireless communication system and ranging method for dynamically changing ranging period thereof

Life of this patent

Terminal in wireless communication system and ranging method for dynamically changing ranging period thereof

Life of this patent

Abstract

Claims12