MOBILE COMMUNICATION SYSTEM, BASE STATION, AND TRANSMISSION POWER CONTROL METHOD

摘要

When a cell in a first system which follows a transmission loss to control an uplink transmit power neighbors a cell in a second system which follows channel fading to control an uplink transmit power, a quality of an uplink signal in the cell in the first system is maintained. The base station includes an uplink signal and interference power measuring unit which measures a desired signal power and an interference signal power from a received signal; an SIR calculating unit which calculates a receive quality for transmit power control from the desired signal power and the interference signal power; a TPC command generating unit which generates transmit power control information in accordance with results of comparing the receive quality for the transmit power control with a predetermined target receive quality; and a signal transmitting unit which transmits, to a user apparatus, a control signal which includes the transmit power control information and resource information which indicates radio resources for the uplink signal, wherein the SIR calculating unit calculates the receive quality for the transmit power control with a calculating method in accordance with communications conditions in a cell of the base station.