Patent ID: 8705481

Claim:
A mobile station device configured to communicate with a base station device, said mobile station device comprising: a reception unit configured to receive downlink data and information indicating a radio resource for contention based signal transmission; and a transmission unit configured to transmit ACK or NACK to said downlink data and a contention based signal, wherein in accordance with setting used in case that said ACK or NACK and said contention based signal collide with each other in a single uplink time frame and made by said base station device for determining whether said ACK or NACK and said contention based signal are simultaneously transmitted or one of said ACK or NACK and said contention based signal is transmitted, and said transmission unit is configured to simultaneously transmit both of said ACK or NACK and said contention based signal or transmit one of said ACK or NACK and said contention based signal in case that said ACK or NACK and said contention based signal collide with each other in the single uplink time frame.