| 摘要 |
PROBLEM TO BE SOLVED: To provide a base station apparatus and a mobile station device capable of determining parameters related to an uplink signal or an uplink reference signal, and performing efficient communication, and a communication method, an integrated circuit and a radio communication system.SOLUTION: When a physical downlink control channel is detected by a common search space, the mobile station device transmits a reference signal for demodulation generated by using a first parameter and related to transmission of a physical uplink channel, and when the physical downlink control channel is detected by a user device specific search space, the mobile station device transmits a reference signal for demodulation generated by using a second parameter and related to the transmission of the physical uplink channel. |
