Patent ID: 8619615

Claim:
A mobile station apparatus which communicates with a base station apparatus using a plurality of component carriers, the mobile station apparatus comprising: a reception unit configured to receive, from the base station apparatus, information which is used to assign a physical uplink shared channel resource; and a transmission unit configured to transmit, to the base station apparatus, uplink control information using a single physical uplink control channel resource in case that the physical uplink shared channel resource is not assigned and a plurality of physical uplink control channel resources is assigned by the base station apparatus, the transmission unit further configured to transmit, to the base station apparatus, the uplink control information using the physical uplink shared channel resource mapped on a first uplink component carrier in case that the physical uplink shared channel resource mapped on the first uplink component carrier is assigned by the base station apparatus, the first uplink component carrier is used for transmitting the uplink control information using the physical uplink control channel resource in case that the physical uplink shared channel resource is not assigned, and the transmission unit further configured to transmit, to the base station apparatus, the uplink control information using the physical uplink shared channel resource mapped on a second uplink component carrier which is different from the first uplink component carrier in case that the physical uplink shared channel resource mapped on the first uplink component carrier is not assigned but the physical uplink shared channel resource mapped on the second uplink component carrier is assigned by the base station apparatus.