Patent ID: 8533554

Claim:
A method for performing a hybrid automatic repeat request (HARD) in a multi-carrier system, performed by a user equipment, the method comprising: receiving a plurality of transport blocks through a plurality of downlink component carriers; determining a plurality of positive-acknowledgement (ACK)/negative-acknowledgement (NACK) resources for the plurality of transport blocks; and if the plurality of ACK/NACK resources overlap, transmitting one bundled ACK/NACK signal for the plurality of transport blocks through an uplink component carrier by using the overlapping ACK/NACK resources, wherein the plurality of transport blocks is received on a physical downlink shared channel (PDSCH) through the plurality of downlink component carriers, and each PDSCH is indicated by a resource allocation on a physical downlink control channel (PDCCH), wherein the plurality of ACK/NACK resources is identified by a plurality of resource indices, and the plurality of resource indices is used for transmission of respective PDCCHs, and wherein the overlapping ACK/NACK resources are resources having a same resource index among the plurality of resource indices.