Communication system, base station, radio network controller, and transmission power controlling method

摘要

A communication system causes a base station to transmit a downlink control signal to a mobile station through a downlink control channel, and causes the base station to transmit a downlink data signal to the mobile station through a downlink data channel. The communication system includes a diversity judging unit configured to judge whether or not transmission diversity control for adjusting a carrier phase difference between multiple downlink signals transmitted through multiple antennas is performed. The communication system also includes a power offset value deciding unit configured to control transmission power of the downlink control signals based on a result of judgment by the diversity judging unit.