| 摘要 |
A communication system, a mobile station device, a base station device, and a processing method for carrying out processing involved in introducing a contention based uplink efficiently, and carrying out communication promptly are provided. A mobile station device communicating with a base station device in a mobile communication system obtains an uplink grant from the base station device, and when a timer for prohibiting transmission of a scheduling request is not running, uses a contention based uplink when the uplink grant is a grant for a contention based uplink, and when the timer for prohibiting transmission of a scheduling request is running, does not use the contention based uplink when the uplink grant is a grant for a contention based uplink.
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