In a CDMA type mobile communication system, when both a radio channel in an up-link
direction and a radio channel in a down-link direction are interrupted, a base
station successively increases down-link transmission power by 1 dB in a constant
interval until a response is sent from a mobile station, while releasing the normal
down-link transmission power control operation. Also, the base station controls
a power control bit produced by the base station so as to successively increase
up-link transmission power of the mobile station.
