Patent ID: 8717969

Claim:
A method for uplink power control in OFDMA (Orthogonal Frequency Division Multiple Access) TDD (Time Division Duplex) system, the method comprising: measuring a RSSI (Received Signal Strength Indicator) of downlink signals; updating a RSSI (Received Signal Strength Indicator) average by calculating a weighted sum of the measured RSSIs and a previous RSSI average; and carrying out an uplink power control based on the updated RSSI average, wherein weights used for calculating the weighted sum are determined according to at least one of a channel variation rate and a link symmetry, wherein the RSSI average is updated by using the following equation: RSSI current avg =α*RSSI+(1−α)*RSSI previous avg , wherein RSSI current avg and RSSIP previous avg are the updated RSSI average and the previous RSSI average, respectively, RSSI is the measured RSSI, and α is a real number higher than 0 and lower than 1, and wherein α is set to a first value when the channel variation rate is lower than a predetermined value, α is set to a second value when the channel variation rate is not lower than the predetermined value, and the first value is higher than the second value.