Patent ID: 8885556

Claim:
A method of performing hybrid automatic repeat request (HARQ) in a multiple carrier system, the method comprising: receiving, by a user equipment (UE) capable of aggregating a plurality of downlink component carriers each of which provides a physical downlink shared channel (PDSCH), a plurality of downlink data on plural PDSCHs through the plurality of downlink component carriers; and transmitting, by the UE, one acknowledgement (ACK)/not-acknowledgement (NACK) signal for the plurality of downlink data through one uplink component carrier, wherein the aggregation is supported for contiguous downlink component carriers and non-contiguous downlink component carriers, and wherein the one ACK/NACK signal is one ACK signal when all of the plurality of downlink data are successfully received and the one ACK/NACK signal is one NACK signal when even one of the plurality of downlink data is unsuccessfully received and the uplink component carrier is associated with the plurality of downlink component carriers.