Patent ID: 6873857

Claim:
A base station apparatus comprising: a signal to interference ratio calculator that calculates a signal to interference ratio using a value obtained by averaging interference signal power for several slot times; a reference value decider that decides whether the calculated signal to interference ratio is greater than a reference value or not; and a transmit power control information creator that creates transmit power control information to instruct either an increase or decrease of transmit power based on the number of slots used to calculate the averaged interference signal power and the decision result of said reference value decider, wherein: when the number of slots used to calculate the averaged interference signal power equals or exceeds a predetermined number, the transmit power control information creator creates the transmit power control information based on the decision result of the reference value decider, and when the number of slots used to calculate the averaged interference signal power is less than the predetermined number, regardless of the decision result of the reference value decider, the transmit power control information creator creates the transmit power control information so as not to allow a transmit power level to fall below a predetermined level.