MOBILE STATION DEVICE, BASE STATION DEVICE, AND COMMUNICATION METHOD

摘要

PROBLEM TO BE SOLVED: To efficiently communicate with a base station by transmitting an A-SRS from a mobile station device.SOLUTION: A base station device informs a mobile station device of control information setting which of a first sounding reference signal arranged in a physical uplink shared channel resource and a second sounding reference signal arranged in a resource different from the physical uplink shared channel resource is to be transmitted by including an instruction to transmit the sounding reference signal in an uplink grant. On receiving the instruction to transmit the sounding reference signal included in the uplink grant, the mobile station device transmits the first sounding reference signal to the base station device when transmission of the first sounding reference signal is set with the transmission control information or transmits the second sounding reference signal to the base station device when transmission of the second sounding reference signal is set with the transmission control information.