User equipment, PDSCH A/N transmitting method thereof, transmission/reception point, and PDSCH A/N receiving method thereof

1. A user equipment configured with at least two serving cells comprising a primary cell (PCell) and a secondary cell (SCell), the PCell and the SCell having different Time Division Duplex (TDD) Uplink-Downlink (UL-DL) configurations, the user equipment comprising:

a transmitter configured to transmit first acknowledgement/negative acknowledgement (A/N) in an uplink subframe determined by a reference TDD configuration for the SCell, the first A/N corresponding to a physical downlink shared channel (PDSCH) transmission on the SCell,

wherein the reference TDD configuration for the SCell has a greatest number of uplink subframes from among one or more reference TDD configurations for the TDD UL-DL configurations of the PCell and the SCell in Table 1 below:

TABLE 1

Reference

TDD con-

PCell TDD UL-DL configuration

figuration

0

1

2

3

4

5

6

SCell TDD

0

0

1, 2,

2, 5

3, 4, 5

4, 5

5

1, 2, 3,

UL-DL

4, 5

4, 5, 6

config-

1

1, 2, 4,

1

2, 5

4, 5

4, 5

5

1, 2, 4,

uration

5

5

2

2, 5

2, 5

2

5

5

5

2, 5

3

3, 4, 5

4, 5

5

3

4, 5

5

3, 4, 5

4

4, 5

4, 5

5

4, 5

4

5

4, 5

5

5

5

5

5

5

5

5

6

1, 2, 3,

1, 2,

2, 5

3, 4, 5

4, 5

5

6

4, 5, 6

4, 5

where each reference TDD configuration in Table 1 indicates downlink association set indexes (K: {k 0 , k 1 , . . . k M-1 }) for a subframe ‘n’ as defined in Table 2 below:

TABLE 2

UL-DL

Config-

Subframe ‘n’

uration

0

1

2

3

4

5

6

7

8

9

0

—

—

6

—

4

—

—

6

—

4

1

—

—

7, 6

4

—

—

—

7, 6

4

—

2

—

—

8, 7,

—

—

—

—

8, 7,

—

—

4, 6

4, 6

3

—

—

7, 6, 11

6, 5

5, 4

—

—

—

—

—

4

—

—

12, 8,

6, 5,

—

—

—

—

—

—

7, 11

4, 7

5

—

—

13, 12,

—

—

—

—

—

—

—

9, 8,

7, 54,

11, 6

6

—

—

7

7

5

—

—

7

7

—

where A/N corresponding to PDSCH transmitted in a subframe (n−k i ) (0≦i≦M−1) is transmitted in the subframe ‘n’.

2. The user equipment of claim 1 , wherein the transmitter is configured to transmit second A/N in an uplink subframe determined by a reference TDD configuration for the PCell, the second A/N corresponding to a PDSCH transmission on the PCell,

wherein the reference TDD configuration for the PCell is the TDD UL-DL configuration of the PCell.

3. The user equipment of claim 1 , wherein, if the one or more reference TDD configurations include the TDD UL-DL configuration of the SCell, the reference TDD configuration for the SCell is the TDD UL-DL configuration of the SCell.

4. A method for transmitting acknowledgement/negative acknowledgement (A/N) by a user equipment configured with at least two serving cells comprising a primary cell (PCell) and a secondary cell (SCell), the PCell and the SCell having different Time Division Duplex (TDD) Uplink-Downlink (UL-DL) configurations, the method comprising:

transmitting first A/N in an uplink subframe determined by a reference TDD configuration for the SCell, the first A/N corresponding to a physical downlink shared channel (PDSCH) transmission on the SCell,

wherein the reference TDD configuration for the SCell has a greatest number of uplink subframes from among one or more reference TDD configurations for the TDD UL-DL configurations of the PCell and the SCell in Table 1 below:

TABLE 1

Reference TDD

PCell TDD UL-DL configuration

configuration

0

1

2

3

4

5

6

SCell TDD

0

0

1, 2, 4, 5

2, 5

3, 4, 5

4, 5

5

1, 2, 3, 4, 5, 6

UL-DL configuration

1

1, 2, 4, 5

1

2, 5

4, 5

4, 5

5

1, 2, 4, 5

2

2, 5

2, 5

2

5

5

5

2, 5

3

3, 4, 5

4, 5

5

3

4, 5

5

3, 4, 5

4

4, 5

4, 5

5

4, 5

4

5

4, 5

5

5

5

5

5

5

5

5

6

1, 2, 3, 4, 5, 6

1, 2, 4, 5

2, 5

3, 4, 5

4, 5

5

6

where each reference TDD configuration in Table 1 indicates downlink association set indexes (K: {k 0 , k 1 , . . . k M-1 }) for a subframe ‘n’ as defined in Table 2 below:

TABLE 2

UL-DL

Subframe ‘n’

Configuration

0

1

2

3

4

5

6

7

8

9

0

—

—

6

—

4

—

—

6

—

4

1

—

—

7, 6

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

—

where A/N corresponding to PDSCH transmitted in a subframe (n−k i )(0≦i≦M−1) is transmitted in the subframe ‘n’.

5. The method of claim 4 , further comprising:

transmitting second A/N in an uplink subframe determined by a reference TDD configuration for the PCell, the second A/N corresponding to a PDSCH transmission on the PCell,

wherein the reference TDD configuration for the PCell is the TDD UL-DL configuration of the PCell.

6. The method of claim 4 , wherein, if the one or more reference TDD configurations include the TDD UL-DL configuration of the SCell, the reference TDD configuration for the SCell is the TDD UL-DL configuration of the SCell.

7. A transmission/reception point that communicates with a user equipment configured with at least two serving cells comprising a primary cell (PCell) and a secondary cell (SCell), the PCell and the SCell having different Time Division Duplex (TDD) Uplink-Downlink (UL-DL) configurations, the transmission/reception point comprising:

a receiver configured to receive first acknowledgement/negative acknowledgement (A/N) from the user equipment in an uplink subframe determined by a reference TDD configuration for the SCell, the first A/N corresponding to a physical downlink shared channel (PDSCH) transmission on the SCell,

wherein the reference TDD configuration for the SCell has a greatest number of uplink subframes from among one or more reference TDD configurations for the TDD UL-DL configurations of the PCell and the SCell in Table 1 below:

TABLE 1

Reference TDD

PCell TDD UL-DL configuration

configuration

0

1

2

3

4

5

6

SCell TDD

0

0

1, 2, 4, 5

2, 5

3, 4, 5

4, 5

5

1, 2, 3, 4, 5, 6

UL-DL configuration

1

1, 2, 4, 5

1

2, 5

4, 5

4, 5

5

1, 2, 4, 5

2

2, 5

2, 5

2

5

5

5

2, 5

3

3, 4, 5

4, 5

5

3

4, 5

5

3, 4, 5

4

4, 5

4, 5

5

4, 5

4

5

4, 5

5

5

5

5

5

5

5

5

6

1, 2, 3, 4, 5, 6

1, 2, 4, 5

2, 5

3, 4, 5

4, 5

5

6

where each reference TDD configuration in Table 1 indicates downlink association set indexes (K: {k 0 , k 1 , . . . k M-1 }) for a subframe ‘n’ as defined in Table 2 below:

TABLE 2

UL-DL

Subframe ‘n’

Configuration

0

1

2

3

4

5

6

7

8

9

0

—

—

6

—

4

—

—

6

—

4

1

—

—

7, 6

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

—

where A/N corresponding to PDSCH transmitted in a subframe (n−k i )(0≦i≦M−1) is transmitted in the subframe ‘n’.

8. The transmission/reception point of claim 7 , wherein the receiver is configured to receive second A/N from the user equipment in an uplink subframe determined by a reference TDD configuration for the PCell, the second A/N corresponding to a PDSCH transmission on the PCell,

wherein the reference TDD configuration for the PCell is the TDD UL-DL configuration of the PCell.

9. The transmission/reception point of claim 7 , wherein, if the one or more reference TDD configurations include the TDD UL-DL configuration of the SCell, the reference TDD configuration for the SCell is the TDD UL-DL configuration of the SCell.

10. A method for receiving acknowledgement/negative acknowledgement (A/N) by a transmission/reception point that communicates with a user equipment configured with at least two serving cells comprising a primary cell (PCell) and a secondary cell (SCell), the PCell and the SCell having different Time Division Duplex (TDD) Uplink-Downlink (UL-DL) configurations, the method comprising:

receiving first A/N from the user equipment in an uplink subframe determined by a reference TDD configuration for the SCell, the first A/N corresponding to a physical downlink shared channel (PDSCH) transmission on the SCell,

wherein the reference TDD configuration for the SCell has a greatest number of uplink subframes from among one or more reference TDD configurations for the TDD UL-DL configurations of the PCell and the SCell in Table 1 below:

TABLE 1

Reference TDD

PCell TDD UL-DL configuration

configuration

0

1

2

3

4

5

6

SCell TDD

0

0

1, 2, 4, 5

2, 5

3, 4, 5

4, 5

5

1, 2, 3, 4, 5, 6

UL-DL configuration

1

1, 2, 4, 5

1

2, 5

4, 5

4, 5

5

1, 2, 4, 5

2

2, 5

2, 5

2

5

5

5

2, 5

3

3, 4, 5

4, 5

5

3

4, 5

5

3, 4, 5

4

4, 5

4, 5

5

4, 5

4

5

4, 5

5

5

5

5

5

5

5

5

6

1, 2, 3, 4, 5, 6

1, 2, 4, 5

2, 5

3, 4, 5

4, 5

5

6

where each reference TDD configuration in Table 1 indicates downlink association set indexes (K: {k 0 , k 1 , . . . k M-1 }) for a subframe ‘n’ as defined in Table 2 below:

TABLE 2

UL-DL

Subframe ‘n’

Configuration

0

1

2

3

4

5

6

7

8

9

0

—

—

6

—

4

—

—

6

—

4

1

—

—

7, 6

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

—

where A/N corresponding to PDSCH transmitted in a subframe (n−k i ) (0≦i≦M−1) is transmitted in the subframe ‘n’.

11. The method of claim 10 , further comprising:

receiving second A/N from the user equipment in an uplink subframe determined by a reference TDD configuration for the PCell, the second A/N corresponding to a PDSCH transmission on the PCell,

wherein the reference TDD configuration for the PCell is the TDD UL-DL configuration of the PCell.

12. The method of claim 10 , wherein, if the one or more reference TDD configurations include the TDD UL-DL configuration of the SCell, the reference TDD configuration for the SCell is the TDD UL-DL configuration of the SCell.