Patent ID: 8478330

Claim:
A method for controlling transmission power of a downlink signal depending on a base station selection signal, wherein a mobile station selects at least one primary base station among a plurality of base stations which are connected to the mobile station for soft handover to produce the base station selection signal designating the at least one primary base station, wherein an uplink signal including the base station selection signal is transmitted to the base stations, the method comprising: receiving the uplink signal including the base station selection signal from the mobile station; determining a transmission power update timing so that the base stations synchronously update the transmission power; and upon reaching the transmission power update timing, controlling the transmission power of the downlink signal as a non-primary base station when the base station selection signal does not match with the base station which receives the base station selection signal, and an amount of loss of the base station selection signal does not exceed a threshold, otherwise controlling the transmission power of the downlink signal as the primary base station.