| 摘要 |
PROBLEM TO BE SOLVED: To provide a mobile station device, a base station device, a communication method, an integrated circuit and a radio communication system, whereby the base station device and the mobile station device can determine parameters related to an uplink signal or an uplink reference signal and perform efficient communication.SOLUTION: In the mobile station device, when a physical downlink control channel is detected in a common search space, it is determined whether a group in a demodulation reference signal sequence is to be hopped for each slot on the basis of a first parameter. When the physical downlink control channel is detected in a user device-specific search space, it is determined whether the group in the demodulation reference signal sequence is to be hopped for each slot on the basis of a second parameter. |
