Patent ID: 7522561

Claim:
An outer-loop power control device in which a reference signal-to-interference power ratio, which is a basis of transmission power control by a communications environment, is variable, comprising: a signal-to-interference power ratio measurement unit measuring a signal-to-interference power ratio of a receiving signal; an error rate measurement unit measuring an error rate of receiving data; a reference signal-to-interference power ratio modification unit setting either an observation time period of an error rate or a number of target observation blocks of the error rate, a unit increment of a reference signal-to-interference power ratio, a unit decrement of the reference signal-to-interference power ratio and a target signal error rate in such a way to satisfy a prescribed relation equation, changing a size of one or more of the unit increment and the unit decrement of the reference signal-to-interference power ratio according to the measured error rate, and modifying the reference signal-to-interference power ratio by a plurality of the unit increment or unit decrement based on the measured error rate; and a command generation unit generating a command for transmission power control by comparing the modified reference signal-to-interference power ratio with the measured interference power ratio.