Method and device for transmitting uplink acknowledgement information in a wireless communication system supporting multiple carriers

1. A method of transmitting uplink acknowledgement/negative-acknowledgement (UL ACK/NACK) information, which is transmitted by a user equipment in a multicarrier supportive wireless communication system, the method comprising:

receiving a downlink control information including a downlink assignment index (DAI) information indicating a combination of a total number (n total ) of downlink control channels and an order value (n index ) of the downlink control channels,

wherein the total number (n total ) of the downlink control channels indicates total number of downlink control channels over all of carriers configured to the user equipment; and

transmitting the UL ACK/NACK information based on the total number (n total ) of the downlink control channels and the order value (n index ) of the downlink control channels indicated by the DAI information,

wherein the DAI information indicates a DAI value among a plurality of DAI values,

wherein the plurality of DAI values includes at least one DAI value such that different combinations of the total number (n total ) of f the downlink control channels and the order value (n index ) of the downlink control channels are mapped duplicatively to a same DAI value, and

wherein the DAI information has a value of DAI=n total (n total −1)/2+n index −1 if n total <N th and wherein the DAI information has a value of DAI=N th (N th −1)/2+n total −N th if n total ≧N th , wherein the N th is a predetermined natural number, and wherein the order value (n index ) of the downlink control channel has a value of a natural number equal to or smaller than n index .

2. The method of claim 1 , wherein if the DAI information indicates that the total number (n total ) of the downlink control channels is a maximum number and the user equipment receives one downlink control channel, the UL ACK/NACK information is transmitted via an uplink control channel resource corresponding to a control channel element index of the one downlink control channel.

3. The method of claim 1 , wherein the total number (n total ) of the downlink control channels comprises a value amounting to a sum of the number of the downlink control channels assigning downlink data channels and the number of the downlink control channels requiring ACK/NACK for whether the corresponding downlink control channel is detected.

4. The method of claim 3 , wherein when the downlink control channel assigns the downlink data channels, the UL ACK/NACK information is created based on whether the downlink data channel is received.

5. The method of claim 1 , wherein the total number (n total ) of the downlink control channels comprises a value amounting to a sum of the number of downlink data channels and the number of the downlink control channels requiring ACK/NACK for whether the corresponding downlink control channel is detected.

6. The method of claim 1 , wherein the total number (n total ) of the downlink control channels comprises a value amounting to a sum of the number of downlink control channels assigning downlink data channels, the number of the downlink data channels scheduled without the downlink control channels, and the number of the downlink control channels requiring ACK/NACK for whether the corresponding downlink control channel is detected.

7. The method of claim 6 , wherein the downlink data channel scheduled without the downlink control channel comprises the downlink data channel scheduled by semi-persistent scheduling (SPS).

8. The method of claim 1 , wherein the total number (n total ) of the downlink control channels comprises the number of the downlink control channels transmitted to the user equipment in a prescribed time interval.

9. A method of transmitting downlink control information, which is transmitted by a base station in a multicarrier supportive wireless communication system, the method comprising:

creating a downlink assignment index (DAI) information indicating a combination of a total number (n total ) of downlink control channels and an order value (n index ) of the downlink control channels,

wherein the total number (n total ) of the downlink control channels indicates total number of downlink control channels over all of carriers configured to the user equipment; and

transmitting a downlink control information including the created downlink assignment index information,

wherein the total number (n total ) of the downlink control channels and the order value (n index ) of the downlink control channels indicated by the DAI information is used for creation of uplink acknowledgement/negative-acknowledgement (UL ACK/NACK) information,

wherein the DAI information indicates a DAI value among a plurality of DAI values, and

wherein the plurality of DAI values includes at least one DAI value such that different combinations of the total number (n total ) of f the downlink control channels and the order value (n index ) of the downlink control channels are mapped duplicatively to a same DAI value, and

wherein the DAI information has a value of DAI=n total (n total −1)/2+n index −1 if n total <N th and wherein the DAI information has a value of DAI=N th (N th −1)/2+n total −N th if n total ≧N th , wherein the N th is a predetermined natural number, and wherein the order value (n index ) of the downlink control channel has a value of a natural number equal to or smaller than n index .

10. A user equipment, which transmits uplink (UL) acknowledgement/negative-acknowledgement (ACK/NACK) information, the user equipment comprising:

a receiving module configured to receive a downlink signal from a base station;

a transmitting module configured to transmit an uplink signal to the base station; and

a processor configured to:

control the receiving module and the transmitting module,

receive a downlink control information including a downlink assignment index (DAI) information indicating a combination of a total number (n total ) of downlink control channels and an order value (n index ) of the downlink control channels via the receiving module, and

transmit the UL ACK/NACK information via the transmitting module based on the total number (n total ) of f the downlink control channels and the order value (n index ) of the downlink control channels indicated by the DAI information,

wherein the total number (n total ) of the downlink control channels indicates total number of downlink control channels over all of carriers configured to the user equipment,

wherein the DAI information indicates a DAI value among a plurality of DAI values,

wherein the plurality of DAI values includes at least one DAI value such that different combinations of the total number (n total ) of the downlink control channels and the order value (n index ) of the downlink control channels are mapped duplicatively to a same DAI value, and

wherein the DAI information has a value of DAI=n total (n total −1)/2+n index −1 if n total <N th and wherein the DAI information has a value of DAI=N th (N th −1)/2+n total −N th if n total ≧N th , wherein the N th is a predetermined natural number, and wherein the order value (n index of the downlink control channel has a value of a natural number equal to or smaller than n index .

11. A base station, which transmits downlink control information in a multicarrier supportive wireless communication system, the base station comprising:

a receiving module configured to receive an uplink signal from a user equipment;

a transmitting module configured to transmit a downlink signal to the user equipment; and

a processor configured to:

control the receiving module and the transmitting module,

create a downlink assignment index (DAI) information indicating a combination of a total number (n total ) of downlink control channels and an order value (n index ) of the downlink control channels, and

transmit the downlink control information including the created DAI information,

wherein the total number (n total ) of the downlink control channels indicates total number of downlink control channels over all of carriers configured to the user equipment,

wherein the total number (n total ) of the downlink control channels and the order value (n index ) of the downlink control channels indicated by the DAI information are used for creation of uplink acknowledgement/negative-acknowledgement (UL ACK/NACK) information in the user equipment,

wherein the DAI information indicates a DAI value among a plurality of DAI values,

wherein the plurality of DAI values includes at least one DAI value such that different combinations of the total number (n total ) of the downlink control channels and the order value (n index ) of the downlink control channels are mapped duplicatively to a same DAI value, and

wherein the DAI information has a value of DAI=n total (n total −1)/2+n index −1 if n total <N th and wherein the DAI information has a value of DAI=N th (N th −1)/2+n total −N th if n total ≧N th , wherein the N th is a predetermined natural number, and wherein the order value (n index ) of the downlink control channel has a value of a natural number equal to or smaller than n index .