Method and apparatus for assigning response channel resources

1. A method of allocating response channel resources by a Node B in a wireless communication system, the method comprising:

setting a User Equipment (UE) to feed back Acknowledgement (ACK)/Negative Acknowledgement (NACK) information in a Carrier Aggregation (CA) mode;

setting a Transmit Power Control (TPC) field of a Physical Downlink Controlling Channel (PDCCH) message to transmit an ACK/NACK Resource Indicator (ARI) information, when a Downlink Assigning Indicator (DAI) value of the PDCCH message of a Secondary cell (Scell) scheduled in a non cross-carrier manner is 1;

setting the TPC field to transmit a TPC command for the ACK/NACK feedback information, when the DAI value is greater than 1; and

transmitting the PDCCH message and downlink data to the UE.

2. The method of claim 1 , further comprising:

setting a TPC field of a PDCCH message scheduling a Primary cell (Pcell) to transmit a TPC command; and

transmitting the PDCCH message.

3. The method of claim 1 , further comprising:

setting a TPC field of a PDCCH message of a Scell scheduled in a cross-carrier manner to transmit a TPC command; and

transmitting the PDCCH message.

4. The method of claim 1 , wherein, when a size of a bundling window is greater than 4, ARI information transmitted in TPC fields of a plurality of PDCCH messages for scheduling the Scell with their DAI values of 1 are equal.

5. A method of transmitting Acknowledgement (ACK)/Negative Acknowledgement (NACK) information using response channel resources by a User Equipment (UE) in a wireless communication system, the method comprising:

receiving a Physical Downlink Controlling Channel (PDCCH) message and downlink data from a Node B;

generating ACK/NACK feedback information for the downlink data;

determining an ACK/NACK channel corresponding to a Secondary cell (Scell) based on the PDCCH message scheduling the Scell with a DAI value of 1, and determining a transmitting power of the ACK/NACK feedback information based on the PDCCH message scheduling the Scell with a DAI value of greater than 1, when the Scell is scheduled in a non cross-carrier manner; and

transmitting the ACK/NACK feedback information with the determined transmitting power using the determined ACK/NACK channel.

6. A Node B for allocating response channel resources in a wireless communication system, the Node B comprising:

a setting unit for setting a User Equipment (UE) to feed back Acknowledgement (ACK)/Negative Acknowledgement (NACK) information in a Carrier Aggregation (CA) mode, setting a Transmit Power Control (TPC) field of a Physical Downlink Controlling Channel (PDCCH) message to transmit an ACK/NACK Resource Indicator (ARI) information, when a Downlink Assigning Indicator (DAI) value of the PDCCH message of a Secondary cell (Scell) scheduled in a non cross-carrier manner is 1, and setting the TPC field to transmit a TPC command for the ACK/NACK feedback information, when the DAI value is greater than 1; and

a transmitter for transmitting the PDCCH message and downlink data to the UE.

7. The Node B of claim 6 , wherein the setting unit sets a TPC field of a PDCCH message scheduling a Primary cell (Pcell) to transmit a TPC command.

8. The Node B of claim 6 , wherein the setting unit sets a TPC field of a PDCCH message of a Scell scheduled in a cross-carrier manner to transmit a TPC command.

9. The Node B of claim 6 , wherein, when a size of a bundling window is greater than 4, ARI information transmitted in TPC fields of a plurality of PDCCH messages for scheduling the Scell with their DAI values of 1 being the same.

10. A User Equipment (UE) for transmitting Acknowledgement (ACK)/Negative Acknowledgement (NACK) information using response channel resources in a wireless communication system, the UE comprising:

a receiver for receiving a Physical Downlink Controlling Channel (PDCCH) message and downlink data from a Node B;

a generator for generating ACK/NACK feedback information for the downlink data, and determining an ACK/NACK channel corresponding to a Secondary cell (Scell) based on the PDCCH message scheduling the Scell with a DAI value of 1, and determining a transmitting power of the ACK/NACK feedback information based on the PDCCH message scheduling the Scell with a DAI value of greater than 1, when the Scell is scheduled in a non cross-carrier manner; and

a transmitter for transmitting the ACK/NACK feedback information with the determined transmitting power using the determined ACK/NACK channel.