COMMUNICATION METHOD, MOBILE STATION APPARATUS, BASE STATION APPARATUS AND MOBILE COMMUNICATION SYSTEM

摘要

A base station apparatus and a mobile station apparatus, when using a plurality of component carriers to communicate with each other, can efficiently transmit and receive control information in HARQ. In a case of having tried the decoding of physical downlink control channels transmitted by the base station apparatus in first downlink component carriers and thereafter having detected a physical downlink control channel corresponding to the transmission of a physical downlink shared channel in second downlink component carriers other than the first downlink component carriers, control information in HARQ is transmitted to the base station apparatus by use of a first physical uplink control channel resource. In a case of having detected a physical downlink control channel corresponding to the transmission of a physical downlink shared channel in the first downlink component carriers, control information in HARQ is transmitted to the base station apparatus by use of a second physical uplink control channel resource.