FIELD: communication systems. SUBSTANCE: base station device used for code-division multiple access (CDMA) system has controller that functions to vary reference value for backward closed-loop power control in fixed control state and transmitter incorporated in allocated forward control channel for conveying power control bit to control transmission power of backward communication line in response to reference value variation. Proposed method describes operation of this device. EFFECT: enlarged capabilities of backward closed-loop power control device. 20 cl, 23 dwg
