be received in the mobile station. Accordingly, the mobile station can control the up transmission power so that the desired wave power will not become excessive for any base station.
On the other hand, during execution of the soft hand-over, even if large and small relationship of the propagation losses from the mobile station and respective base stations is switched at high speed due to fading fluctuation or the like, owing to diversity effect to maintain the reception quality substantially constant, the reception quality in the mobile station can be further improved. By controlling the up transmission power so that the desired wave power will not become excessive, channel capacity of the uplink can be increased. On the other hand, if the reception quality in the mobile station canbase station having large transmission power is significantly decreased the transmission power to reduce the difference of the transmission power between the base stations to effect balance adjustment.
However, as shown in FIG. 9B, when the start timing of the adjusting period is difference between the base stations such as T1 and T1′, since the transmission power according to the transmission power control instruction is constantly varied, if the transmission power of one of two base stations becomes greater than the other base station (P1>P2), the adjustment start timing T1 of the former base station is a moment where the transmission power is relatively small, and the adjustment start timing of later base station is a moment where the transmission power is relatively large, the difference between the transmission