RADIO COMMUNICATION SYSTEM, BASE STATION DEVICE, MOBILE STATION DEVICE, AND COMMUNICATION METHOD.

摘要

TPC is appropriately carried out at the timing when the access method is switched, and communication error is thus prevented from occurring, and the influence of the transmission of unnecessary power on other cells is mitigated. A base station device communicating with a mobile station device by radio while switching between communication systems of different types transmits control information for controlling the transmission power of the mobile station device to the mobile station device when the communication system is switched. The mobile station device receives the control information for controlling the transmission power from the base station device when the communication system is switched and determines the transmission power according to the control information.