A base station apparatus which transmits, to a mobile station apparatus , a transport block using a physical downlink shared channel, PDSCH, the PDSCH being scheduled using a physical downlink control channel, PDCCH, the base station apparatus characterized by comprising: a scheduling unit configured to configure a set of a plurality of first physical uplink control channel, PUCCH, resources on a single uplink component carrier, the set being semi-statically allocated, by the base station apparatus with use of a parameter transmitted using a radio resource control signal, to the mobile station apparatus , the single uplink component carrier, on which the set is allocated, being indicated using a radio resource control signal, the scheduling unit configured to schedule a second PUCCH resource on the single uplink component carrier for a PDSCH transmission scheduled using a PDCCH in a subframe on a first downlink component carrier, the first downlink component carrier being activated and linked to the single uplink component carrier, the second PUCCH resource being scheduled based on a control channel element of the PDCCH, the scheduling unit configured to schedule a first PUCCH resource on the single uplink component carrier for a PDSCH transmission scheduled using a PDCCH in the subframe on a second downlink component carrier, the second downlink component carrier being activated and different from the first downlink component carrier, the first PUCCH resource being scheduled from the set, the set being allocated for the PDSCH transmission on the second downlink component carrier but not the PDSCH transmission on the first downlink component carrier, and a receiving unit configured to receive, from the mobile station apparatus , information bits using one of the scheduled first and second PUCCH resources, the information bits being used for indicating Hybrid Automatic Repeat Request, HARQ, control information for a plurality of transport blocks, the plurality of transport blocks being transmitted on the first and second downlink component carriers by the base station apparatus . a scheduling unit configured to configure a set of a plurality of first physical uplink control channel, PUCCH, resources on a single uplink component carrier, the set being semi-statically allocated, by the base station apparatus with use of a parameter transmitted using a radio resource control signal, to the mobile station apparatus , the single uplink component carrier, on which the set is allocated, being indicated using a radio resource control signal, the scheduling unit configured to schedule a second PUCCH resource on the single uplink component carrier for a PDSCH transmission scheduled using a PDCCH in a subframe on a first downlink component carrier, the first downlink component carrier being activated and linked to the single uplink component carrier, the second PUCCH resource being scheduled based on a control channel element of the PDCCH, the scheduling unit configured to schedule a first PUCCH resource on the single uplink component carrier for a PDSCH transmission scheduled using a PDCCH in the subframe on a second downlink component carrier, the second downlink component carrier being activated and different from the first downlink component carrier, the first PUCCH resource being scheduled from the set, the set being allocated for the PDSCH transmission on the second downlink component carrier but not the PDSCH transmission on the first downlink component carrier, and a receiving unit configured to receive, from the mobile station apparatus , information bits using one of the scheduled first and second PUCCH resources, the information bits being used for indicating Hybrid Automatic Repeat Request, HARQ, control information for a plurality of transport blocks, the plurality of transport blocks being transmitted on the first and second downlink component carriers by the base station apparatus . <EOS>