Method and apparatus for determining transmission power of uplink control channel in wireless communication system

1. A method for receiving an uplink (UL) control channel from a user equipment (UE), the method performed by a base station and comprising:

configuring, to the UE, two cells with different uplink-downlink (UL-DL) configurations; and

receiving, from the UE, the UL control channel in a subframe n of a first cell;

wherein a transmit power of the UL control channel is determined based on a parameter value which depends on a maximum value M between N1 and N2,

wherein N1 is a number of downlink subframes associated with the subframe n of the first cell having a first UL-DL configuration and N2 is a number of downlink subframes associated with a subframe n of a second cell having a second UL-DL configuration,

wherein, if the maximum value M is 3 or 4, the parameter value is either 2 or 4 based on whether or not a data channel or a control channel indicating a semi-persistent scheduling (SPS) release is transmitted to the UE in a subframe n-k of only one cell between the first cell and the second cell, and

wherein n and k are integers greater than or equal to 0.

2. The method of claim 1 , wherein a value of k is determined by the following table for each UL-DL configuration, the subframe n of the first cell and the subframe n of the second cell:

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

—.

3. The method of claim 1 , wherein the first cell is a primary cell in which the UE performs an initial connection establishment procedure or a connection re-establishment procedure with respect to the base station.

4. The method of claim 3 , wherein the second cell is a secondary cell which is added to the UE in addition to the primary cell.

5. The method of claim 1 , wherein the first UL-DL configuration and the second UL-DL configuration are two different configurations among UL-DL configurations of the following table:

UL-DL

Subframe number

configuration

0

1

2

3

4

5

6

7

8

9

0

D

S

U

U

U

D

S

U

U

U

1

D

S

U

U

D

D

S

U

U

D

2

D

S

U

D

D

D

S

U

D

D

3

D

S

U

U

U

D

D

D

D

D

4

D

S

U

U

D

D

D

D

D

D

5

D

S

U

D

D

D

D

D

D

D

6

D

S

U

U

U

D

S

U

U

D,

where D denotes a downlink subframe, S denotes a special subframe, and U denotes an uplink subframe.

6. The method of claim 1 , wherein one of N1 and N2 is 4, and the other one of N1 and N2 is 0, 1, or 2.

7. The method of claim 1 , wherein the first cell and the second cell are time division duplex (TDD) cells.

8. A base station for receiving an uplink (UL) control channel from a user equipment (UE), the base station comprising:

a transceiver configured to transmit and receive a radio signal; and

a processor operatively coupled to the transceiver,

wherein the processor is configured to:

configure, to the UE, two cells with different uplink-downlink (UL-DL) configurations, and

control the transceiver to receive, from the UE, the UL control channel in a subframe n of a first cell,

wherein a transmit power of the UL control channel is determined based on a parameter value which depends on a maximum value M between N1 and N2,

wherein N1 is a number of downlink subframes associated with the subframe n of the first cell having a first UL-DL configuration and N2 is a number of downlink subframes associated with a subframe n of a second cell having a second UL-DL configuration,

wherein, if the maximum value M is 3 or 4, the parameter value is either 2 or 4 based on whether or not a data channel or a control channel indicating a semi-persistent scheduling (SPS) release is transmitted to the UE in a subframe n-k of only one cell between the first cell and the second cell, and

wherein n and k are integers greater than or equal to 0.

9. The base station of claim 8 , wherein a value of k is determined by the following table for each UL-DL configuration, the subframe n of the first cell and the subframe n of the second cell:

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

—.

10. The base station of claim 8 , wherein the first cell is a primary cell in which the UE performs an initial connection establishment procedure or a connection re-establishment procedure with respect to the base station.

11. The base station of claim 10 , wherein the second cell is a secondary cell which is added to the UE in addition to the primary cell.

12. The base station of claim 8 , wherein the first UL-DL configuration and the second UL-DL configuration are two different configurations among UL-DL configurations of the following table:

UL-DL

Subframe number

configuration

0

1

2

3

4

5

6

7

8

9

0

D

S

U

U

U

D

S

U

U

U

1

D

S

U

U

D

D

S

U

U

D

2

D

S

U

D

D

D

S

U

D

D

3

D

S

U

U

U

D

D

D

D

D

4

D

S

U

U

D

D

D

D

D

D

5

D

S

U

D

D

D

D

D

D

D

6

D

S

U

U

U

D

S

U

U

D,

where D denotes a downlink subframe, S denotes a special subframe, and U denotes an uplink subframe.

13. The base station of claim 8 , wherein one of N1 and N2 is 4, and the other one of N1 and N2 is 0, 1, or 2.

14. The base station of claim 8 , wherein the first cell and the second cell are time division duplex (TDD) cells.