Method for effectively transmitting control signal in wireless communication system

1. A method of transmitting a reception acknowledgement in a wireless communication system, performed by a user equipment, the method comprising:

determining a M downlink subframe associated with an uplink subframe n at a specific uplink-downlink configuration, where M is the number of elements in a set K in accordance with the specific uplink-downlink configuration;

receiving a bundling indicator from a base station, the bundling indicator indicating a total number of subframes with at least one assigned physical downlink shared channel (PDSCH) transmission within downlink subframe n-k, where kεK;

determining a counter value including a total number of at least one physical downlink control channel (PDCCH) detected by the user equipment in downlink subframe n-k, where kεK, each detected PDCCH carrying a downlink assignment used for each PDSCH transmission;

determining whether at least one downlink assignment is missed based on the bundling indicator and the counter value; and

transmitting a ACK/NACK signal in the uplink subframe n to the base station,

wherein the ACK/NACK signal is a NACK if at least one downlink assignment is determined as missed.

2. The method of claim 1 , wherein the ACK/NACK signal is determined by a logical AND operation of ACK/NACKs for all PDSCH transmission over the M downlink subframe if no downlink assignment is determined as missed.

3. The method of claim 1 , wherein at least one downlink assignment is determined as missed if V DAI ≠(N DAI −1) mod 4+1, where V DAI denotes a value of the bundling indicator, N DAI denotes the counter value and ‘mod’ denotes modulo operation.

4. The method of claim 1 , further comprising:

transmitting information indicating a value of the bundling indicator in the uplink subframe n to the base station.

5. The method of claim 4 , wherein the ACK/NACK signal and the information indicating the value of the bundling indicator are transmitted on a physical uplink shared channel.

6. The method of claim 1 , wherein the set K is defined as one of the following table in accordance with a subframe n and an uplink-downlink configuration:

uplink-

downlink

Subframe n

configuration

0

1

2

3

4

5

6

7

8

9

0

—

—

6

—

5

—

—

6

—

4

1

—

—

6, 7

4

—

—

—

7, 6

4

—

2

—

—

8, 7, 4, 6

—

—

—

—

8, 7, 4, 6

—

—

3

—

—

7, 6, 11

6, 5

5, 4

—

—

—

—

—

4

—

—

12, 8, 7, 11

6, 5, 4, 7

—

—

—

—

—

—

5

—

—

13, 12, 9, 8, 7, 5,

—

—

—

—

—

—

—

4, 11, 6

6

—

—

7

7

5

—

—

7

7

—

7. A user equipment of transmitting a reception acknowledgement in a wireless communication system, the user equipment comprising:

a radio frequency unit for receiving and transmitting radio signals; and

a processor operatively coupled with the radio frequency unit and configured for:

determining a M downlink subframe associated with an uplink subframe n at a specific uplink-downlink configuration, where M is the number of elements in a set K in accordance with the specific uplink-downlink configuration;

receiving a bundling indicator from a base station, the bundling indicator indicating a total number of subframes with at least one assigned physical downlink shared channel (PDSCH) transmission within downlink subframe n-k, where kεK;

determining a counter value including a total number of at least one physical downlink control channel (PDCCH) detected by the user equipment in downlink subframe n-k, where kεK, each detected PDCCH carrying a downlink assignment used for each PDSCH transmission;

determining whether at least one downlink assignment is missed based on the bundling indicator and the counter value; and

transmitting a ACK/NACK signal in the uplink subframe n to the base station,

wherein the ACK/NACK signal is a NACK if at least one downlink assignment is determined as missed.

8. The user equipment of claim 7 , wherein the ACK/NACK signal is determined by a logical AND operation of ACK/NACKs for all PDSCH transmission over the M downlink subframe if no downlink assignment is determined as missed.

9. The user equipment of claim 7 , wherein at least one downlink assignment is determined as missed if V DAI ≠(N DAI −1) mod 4+1, where V DAI denotes a value of the bundling indicator, N DAI denotes the counter value and ‘mod’ denotes modulo operation.

10. The user equipment of claim 7 , wherein the processor is further configured for:

transmitting information indicating a value of the bundling indicator in the uplink subframe n to the base station.

11. The user equipment of claim 10 , wherein the ACK/NACK signal and the information indicating the value of the bundling indicator are transmitted on a physical uplink shared channel.

12. The user equipment of claim 7 , wherein the set K is defined as one of the following table in accordance with a subframe n and an uplink-downlink configuration:

uplink-

downlink

Subframe n

configuration

0

1

2

3

4

5

6

7

8

9

0

—

—

6

—

5

—

—

6

—

4

1

—

—

6, 7

4

—

—

—

7, 6

4

—

2

—

—

8, 7, 4, 6

—

—

—

—

8, 7, 4, 6

—

—

3

—

—

7, 6, 11

6, 5

5, 4

—

—

—

—

—

4

—

—

12, 8, 7, 11

6, 5, 4, 7

—

—

—

—

—

—

5

—

—

13, 12, 9, 8, 7, 5,

—

—

—

—

—

—

—

4, 11, 6

6

—

—

7

7

5

—

—

7

7

—