Method and apparatus for controlling downlink HARQ timing in TDD environment

1. A method of controlling a downlink HARQ timing in a TDD (Time Division Duplex) environment, the method comprising:

configuring, by a Base Station (BS), a duplex mode of a PCell and a duplex mode of an SCell to be different from each other, and transmitting configuration information to a User Equipment (UE), wherein the duplex mode of the PCell is a TDD mode and the duplex mode of the SCell is an FDD (Frequency Division Duplex) mode;

transmitting, by the BS, a PDSCH (Physical Downlink Shared Channel) in a subframe n−k of the SCell; and

receiving, by the BS, HARQ response information (HARQ Acknowledgement) in a subframe n of the PCell from the UE, by applying an association set index k of a downlink HARQ timing corresponding to the configuration information,

wherein k has a value that is greater than or equal to 4 and less than or equal to 13, wherein the value of k for configurations 0, 2, and 5 is in the table as provided below:

UL-DL

configuration

Subframe n (FDD, SCell)

(TDD, PCe1l)

0

1

2

3

4

5

6

7

8

9

0

—

—

6, 5

5, 4

4

—

—

6, 5

5,

4

4

2

—

—

8, 7, 6,

—

—

—

—

8, 7,

—

—

5, 4

6, 5, 4

5

—

—

13, 12,

—

—

—

—

—

—

—.

11, 10,

9, 8, 7,

6, 5, 4

2. The method as claimed in claim 1 , wherein HARQ response information with respect to 10 consecutive downlink subframes of the SCell are dispersively transmitted in one or more uplink subframes in a single radio frame of the PCell.

3. The method as claimed in claim 2 , further comprising: transmitting, by the BS, the association set index k to the UE, wherein the association set index k is a downlink association set index.

4. The method as claimed in claim 3 , wherein the downlink association set index k is information in the table as provided below:

UL-DL

configuration

Subframe n (FDD, SCell)

(TDD, PCell)

0

1

2

3

4

5

6

7

8

9

0

—

—

6, 5

5, 4

4

—

—

6, 5

5, 4

4

1

—

—

7, 6, 5

5, 4

—

—

—

7, 6, 5

5, 4

—

2

—

—

8, 7, 6, 5, 4

—

—

—

—

8, 7, 6, 5, 4

—

—

3

—

—

11, 10, 9, 8

8, 7, 6

6, 5, 4

—

—

—

—

—

4

—

—

12, 11, 10, 9, 8

8, 7, 6, 5, 4

—

—

—

—

—

—

5

—

—

13, 12, 11, 10, 9, 8, 7,

—

—

—

—

—

—

—

6, 5, 4

6

—

—

7, 6

6, 5

5, 4

—

—

6, 5

5, 4

—.

5. The method as claimed in claim 1 , wherein the value of k for configurations 3 and 4 is in the table as provided below:

UL-DL

configuration

Subframe n (FDD, SCell)

(TDD, PCell)

0

1

2

3

4

5

6

7

8

9

3

—

—

11, 10, 9,

6, 5

5, 4

—

—

—

—

—

8, 7, 6

4

—

—

12, 11,

7, 6,

—

—

—

—

—

—.

10, 9, 8, 7

5, 4

6. A method of controlling a downlink HARQ timing in a TDD (Time Division Duplex) environment, the method comprising:

receiving, by a User Equipment (UE) from a Base Station (B S), configuration information that configures a duplex mode of a PCell and a duplex mode of an SCell to be different from each other, wherein the duplex mode of the PCell is a TDD mode and the duplex mode of the SCell is an FDD (Frequency Division Duplex) mode;

receiving, by the UE, a PDSCH (Physical Downlink Shared Channel) in a subframe n−k of the SCell; and

transmitting, by the UE, HARQ response information (HARQ Acknowledgement) in a subframe n of the PCell by applying an association set index k of a downlink HARQ timing corresponding to the configuration information,

wherein k has a value that is greater than or equal to 4 and less than or equal to 13, wherein the value of k for configurations 0, 2, and 5 is in the table as provided below:

UL-DL

configuration

Subframe n (FDD, SCell)

(TDD, PCell)

0

1

2

3

4

5

6

7

8

9

0

—

—

6, 5

5, 4

4

—

—

6, 5

5,

4

4

2

—

—

8, 7, 6,

—

—

—

—

8, 7,

—

—

5, 4

6, 5, 4

5

—

—

13, 12,

—

—

—

—

—

—

—.

11, 10,

9, 8, 7,

6, 5, 4

7. The method as claimed in claim 6 , wherein the UE dispersively transmits HARQ response information with respect to 10 consecutive downlink subframes of the SCell in one or more uplink subframes in a single radio frame of the PCell.

8. The method as claimed in claim 7 , further comprising:

receiving, by the UE, the association set index k from the BS, wherein the association set index k is a downlink association set index.

9. The method of claim 8 , wherein the downlink association set index k is information in the table as provided below:

UL-DL

configuration

Subframe n (FDD, SCell)

(TDD, PCell)

0

1

2

3

4

5

6

7

8

9

0

—

—

6, 5

5, 4

4

—

—

6, 5

5, 4

4

1

—

—

7, 6, 5

5, 4

—

—

—

7, 6, 5

5, 4

—

2

—

—

8, 7, 6, 5, 4

—

—

—

—

8, 7, 6,

—

—

5, 4

3

—

—

11, 10, 9, 8

8, 7, 6

6, 5, 4

—

—

—

—

—

4

—

—

12, 11, 10, 9, 8

8, 7, 6,

—

—

—

—

—

—

5, 4

5

—

—

13, 12, 11, 10, 9, 8, 7,

—

—

—

—

—

—

—

6, 5, 4

6

—

—

7, 6

6, 5

5, 4

—

—

6, 5

5, 4

—.

10. The method as claimed in claim 6 , wherein the value of k for configurations 3 and 4 is in the table as provided below:

UL-DL

configuration

Subframe n (FDD, SCell)

(TDD, PCell)

0

1

2

3

4

5

6

7

8

9

3

—

—

11, 10, 9,

6, 5

5, 4

—

—

—

—

—

8, 7, 6

4

—

—

12, 11, 10,

7, 6,

—

—

—

—

—

—.

9, 8, 7

5, 4

11. A Base Station (BS) that controls a downlink HARQ timing in a TDD (Time Division Duplex) environment, the BS comprising:

a transmitting unit that transmits information or a signal to a User Equipment (UE);

a receiving unit that receives HARQ response information (HARQ Acknowledgement) from the UE; and

a controller that configures a duplex mode of a PCell and a duplex mode of an SCell to be different from each other, wherein the duplex mode of the PCell is a TDD mode and the duplex mode of the SCell is an FDD (Frequency Division Duplex) mode, and controls the transmitting unit to transmit the configuration information to the UE,

wherein the controller controls the transmitting unit to transmit a PDSCH (Physical Downlink Shared Channel) in a subframe n−k of the SCell; and controls the receiving unit to receive HARQ response information in a subframe n of the PCell from the UE by applying an association set index k of a downlink HARQ timing corresponding to the configuration information, and

k has a value that is greater than or equal to 4 and less than or equal to 13, wherein the value of k for configurations 0, 2, and 5 is in the table as provided below:

UL-DL

configuration

Subframe n (FDD, SCell)

(TDD, PCell)

0

1

2

3

4

5

6

7

8

9

0

—

—

6, 5

5, 4

4

—

—

6, 5

5,

4

4

2

—

—

8, 7, 6,

—

—

—

—

8, 7,

—

—

5, 4

6, 5, 4

5

—

—

13, 12, ,

—

—

—

—

—

—

—.

11, 10

9, 8, 7,

6, 5, 4

12. The BS as claimed in claim 11 , wherein the receiving unit dispersively receives HARQ response information with respect to 10 consecutive downlink subframes of the SCell, in one or more uplink subframes in a single radio frame of the PCell.

13. The BS as claimed in claim 12 , wherein the transmitting unit transmits the association set index k to the UE, wherein the association set index k is a downlink association set index.

14. The BS as claimed in claim 13 , wherein the downlink association set index k is information in the table as provided below:

UL-DL

configuration

Subframe n (FDD, SCell)

(TDD, PCell)

0

1

2

3

4

5

6

7

8

9

0

—

—

6, 5

5, 4

4

—

—

6, 5

5, 4

4

1

—

—

7, 6, 5

5, 4

—

—

—

7, 6, 5

5, 4

—

2

—

—

8, 7, 6, 5, 4

—

—

—

—

8, 7, 6,

—

—

5, 4

3

—

—

11, 10, 9, 8

8, 7, 6

6, 5, 4

—

—

—

—

—

4

—

—

12, 11, 10, 9, 8

8, 7, 6,

—

—

—

—

—

—

5, 4

5

—

—

13, 12, 11, 10, 9, 8,

—

—

—

—

—

—

—

7, 6, 5, 4

6

—

—

7, 6

6, 5

5, 4

—

—

6, 5

5, 4

—.

15. The B S as claimed in claim 11 , wherein the value of k for configurations 3 and 4 is in the table as provided below:

UL-DL

configuration

Subframe n (FDD, SCell)

(TDD, PCell)

0

1

2

3

4

5

6

7

8

9

3

—

—

11, 10, 9,

6, 5

5, 4

—

—

—

—

—

8, 7, 6

4

—

—

12, 11, 10,

7, 6,

—

—

—

—

—

—.

9, 8, 7

5, 4

16. A User Equipment (UE) that controls a downlink HARQ timing in a TDD (Time Division Duplex) environment, the UE comprising:

a receiving unit that receives, from a Base Station (BS), configuration information that configures a duplex mode of a PCell and a duplex mode of an SCell to be different from each other, wherein the duplex mode of the PCell is a TDD mode and the duplex mode of the SCell is an FDD (Frequency Division Duplex) mode, and receives a PDSCH (Physical Downlink Shared Channel) in a subframe n−k of the SCell;

a transmitting unit that transmits information or a signal to the BS; and

a controller that controls the transmitting unit to transmit HARQ response information (HARQ Acknowledgement) in a subframe n of the PCell by applying an association set index k of a downlink HARQ timing corresponding to the configuration information,

wherein k has a value that is greater than or equal to 4 and less than or equal to 13, wherein the value of k for configurations 0, 2, and 5 is in the table as provided below:

UL-DL

configuration

Subframe n (FDD, SCell)

(TDD, PCell)

0

1

2

3

4

5

6

7

8

9

0

—

—

6, 5

5, 4

4

—

—

6, 5

5,

4

4

2

—

—

8, 7, 6,

—

—

—

—

8, 7,

—

—

5, 4

6, 5, 4

5

—

—

13, 12,

—

—

—

—

—

—

—.

11, 10,

9, 8, 7,

6, 5, 4

17. The UE as claimed in claim 16 , wherein the controller controls the transmitting unit to dispersively transmit HARQ response information with respect to 10 consecutive downlink subframes of the SCell, in one or more uplink subframes in a single radio frame of the PCell.

18. The UE as claimed in claim 17 , wherein the receiving unit receives the association set index k from the B S, wherein the association set index k is a downlink association set index.

19. The UE as claimed in claim 18 , wherein the downlink association set index k is information in the table as provided below:

UL-DL

configuration

Subframe n (FDD, Scell)

(TDD, Pcell)

0

1

2

3

4

5

6

7

8

9

0

—

—

6, 5

5, 4

4

—

—

6, 5

5, 4

4

1

—

—

7, 6, 5

5, 4

—

—

—

7, 6, 5

5, 4

—

2

—

—

8, 7, 6, 5, 4

—

—

—

—

8, 7, 6,

—

—

5, 4

3

—

—

11, 10, 9, 8

8, 7, 6

6, 5, 4

—

—

—

—

—

4

—

—

12, 11, 10, 9, 8

8, 7, 6,

—

—

—

—

—

—

5, 4

5

—

—

13, 12, 11, 10, 9, 8, 7,

—

—

—

—

—

—

—

6, 5, 4

6

—

—

7, 6

6, 5

5, 4

—

—

6, 5

5, 4

—.

20. The UE as claimed in claim 16 , wherein the value of k for configurations 3 and 4 is in the table as provided below:

UL-DL

configuration

Subframe n (FDD, SCell)

(TDD, PCell)

0

1

2

3

4

5

6

7

8

9

3

—

—

11, 10, 9,

6, 5

5, 4

—

—

—

—

—

8, 7, 6

4

—

—

12, 11, 10,

7, 6,

—

—

—

—

—

—.

9, 8, 7

5, 4