Patent ID: 7486935
Filing Date: 2009-02-03
Classification: H04W

Abstract:
1. A method of controlling a transmission power of a transmission-power controlled station from a transmission-power control station such that an SIR (Signal-to-Interference Ratio) value of received power of the transmission-power control station converges to a desired target SIR, said method comprising: a first step of calculating a first estimated SIR having a short mean processing time on a basis of a signal received by said transmission-power control station and a second estimated SIR having a longer mean processing time than the mean processing time to calculate the first estimated SIR, the first step includes a first sub-step of calculating mean powers of said received signals, a second sub-step of calculating a mean value of the mean powers obtained in the first sub-step, a third sub-step of calculating mean powers of desired signal wave components of the received signals, a fourth sub-step of calculating a mean value of said mean powers obtained in the third sub-step, a fifth sub-step of calculating said first estimated SIR on the basis of the mean powers obtained in the first and the third sub-steps, and a sixth sub-step of calculating said second estimated SIR on the basis of the mean values obtained in the second and fourth sub-steps; a second step of generating power control information for setting said first estimated SIR in a comparison SIR and storing the comparison SIR to thereby control said transmission power such that the first estimated SIR converges to the comparison SIR; a third step of updating said comparison SIR such that said second estimated SIR converges to a desired target SIR; and a fourth step of controlling the transmission power of the transmission-power controlled station in accordance with said power control information.