Patent ID: 6862458

Claim:
A transmission power control apparatus comprising: a measurer that measures a received SIR value, which is a reception desired signal to interference ratio; a setter that sets a target SIR value decreased by a predetermined first value when a received signal quality is better than a desired quality, or sets said target SIR value increased by a second value that is greater than said first value if the received signal quality is poorer than said desired quality; and a generator that generates transmission power control information for implementing a directive to a communicating party to increase or decrease transmission power so that a difference between said received SIR value and said target SIR value is eliminated, wherein: when a difference between a maximum value and a minimum value of target SIR values in a past period exceeds a predetermined threshold value, the setter provides a lower limit value for the target SIR value and performs control so that the target SIR value is not set to be equal to or less than said lower limit value.