| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a mobile communication system capable of improving a channel estimation accuracy through a base station device using an aperiodic sounding reference signal transmitted from a mobile station device, and to provide the mobile station device and a communication method. <P>SOLUTION: A base station device (100) notifies a mobile station device MS1 (200) of a radio resource control signal containing a frequency hopping cycle of the sounding reference signal and notifies the mobile station device (200) of a downlink control information format containing a transmission instruction of the sounding reference signal. The mobile station device (200) sets the frequency hopping cycle of the sounding reference signal according to the radio resource control signal and transmits the sounding reference signal to the base station device (100) in a frequency position calculated based on the frequency hopping cycle, according to the downlink control information format. <P>COPYRIGHT: (C)2012,JPO&INPIT |
