WIRELESS COMMUNICATION SYSTEM, BASE STATION DEVICE, MOBILE STATION DEVICE, WIRELESS COMMUNICATION METHOD, AND INTEGRATED CIRCUIT

摘要

In the present invention, when a mobile station device transmits a physical random access channel to a base station device via a plurality of cells, the transmission power of a physical uplink channel is efficiently controlled. In a mobile station device, which performs a random access procedure with a base station device via a plurality of cells, downlink control information containing a transmission power control command regarding a physical uplink control channel is received from the base station device, a parameter is calculated by accumulating values indicated by the transmission power control command, the transmission power of a physical uplink control channel is set using the parameter, the physical uplink control channel is transmitted to the base station device via a particular cell, and when a random access response regarding the particular cell is received from the base station device, the accumulation of the parameter is reset.