Method and apparatus for transmitting reception acknowledgement information in wireless communication system

1. A method for configuring an acknowledgement for a hybrid automatic repeat request (HARQ) in a wireless communication system, the method comprising:

receiving downlink data through one of a first downlink component carrier and a second downlink component carrier from a base station;

determining whether the first downlink component carrier or the second downlink component carrier is used for receiving the downlink data; and

determining a resource used for a physical uplink control channel (PUCCH) to transmit an ACK/NACK signal for the downlink data in accordance with the determination,

wherein if the first downlink component carrier is used for receiving the downlink data, the resource used for the PUCCH is determined by using a control channel element (CCE) of a physical downlink control channel (PDCCH) associated with the downlink data,

wherein if the second downlink component carrier is used for receiving the downlink data, the resource used for the PUCCH is determined by using a radio resource control (RRC) message, and

wherein the resource used for the PUCCH is associated with an orthogonal sequence with which the ACK/NACK signal is spread.

2. The method of claim 1 , wherein the first downlink component carrier is a primary component carrier, and the second component carrier is a secondary component carrier.

3. The method of claim 1 , wherein a radio resource allocated for the downlink data is indicated by downlink control information (DCI) and received through the PDCCH.

4. The method of claim 1 , wherein if the first downlink component carrier is used for receiving the downlink data, a payload size of the PUCCH is one or two bits, and if the second downlink component carrier is used for receiving the downlink data, the payload size of the PUCCH is more than two bits.

5. The method of claim 1 , wherein the downlink data is received on a physical downlink shared channel (PDSCH).

6. A user equipment configuring an acknowledgement for a hybrid automatic repeat request (HARQ) in a wireless communication system, comprising:

a radio frequency (RF) unit; and

a processor coupled to the RF unit and configured to:

receive downlink data through one of a first downlink component carrier and a second downlink component carrier from a base station,

determine whether the first downlink component carrier or the second downlink component carrier is used for receiving the downlink data,

determine a resource used for a physical uplink control channel (PUCCH) to transmit an ACK/NACK signal for the downlink data in accordance with the determination,

wherein if the first downlink component carrier is used for receiving the downlink data, the resource used for the PUCCH is determined by using a control channel element (CCE) of a physical downlink control channel (PDCCH) associated with the downlink data,

wherein if the second downlink component carrier is used for receiving the downlink data, the resource used for the PUCCH is determined by using a radio resource control (RRC) message, and

wherein the resource used for the PUCCH is associated with an orthogonal sequence with which the ACK/NACK signal is spread.

7. The user equipment of claim 6 , wherein the first downlink component carrier is a primary component carrier, and the second component carrier is a secondary component carrier.

8. The user equipment of claim 6 , wherein a radio resource allocated for the downlink data is indicated by downlink control information (DCI) and received through the PDCCH.

9. The user equipment of claim 6 , wherein if the first downlink component carrier is used for receiving the downlink data, a payload size of the PUCCH is one or two bits, and if the second downlink component carrier is used for receiving the downlink data, the payload size of the PUCCH is more than two bits.

10. The user equipment of claim 6 , wherein the downlink data is received on a physical downlink shared channel (PDSCH).