Method for controlling transmission of uplink control information on plurality of serving cells, and apparatus therefor

1. A method of a User Equipment (UE) for controlling transmission of uplink control information in a plurality of serving cells, the method comprising:

comparing a number K of Uplink Control Informations (UCIs) to be simultaneously transmitted and a number M of UCIs available for simultaneous transmission and selecting M UCIs from UCIs to be simultaneously transmitted when the number K is greater than the number M; and

transmitting, to a Base Station (BS), the selected M UCIs through a Physical Uplink Control CHannel (PUCCH) of each serving cell,

wherein the number M is less than or equal to a number N of serving cells, and the number M is a natural number greater than or equal to 1; and

wherein the selecting includes:

selecting UCIs from the K UCIs, based on at least one of a priority set with each UCI and a Carrier Indicator Field (CIF) of a serving cell.

2. The method as claimed in claim 1 , wherein:

the serving cells are classified into two or more serving cell groups; and

the selecting comprises performing at least one of:

selecting UCIs based on CIFs of serving cells where uplink control information of the two or more serving cell groups are transmitted to; and

defining differential priorities of serving cell groups and selecting UCIs based on the priorities of the serving cell groups.

3. The method as claimed in claim 1 , wherein the priority is set based on a type of each UCI.

4. The method as claimed in claim 1 , wherein the transmitting comprises:

selecting UCIs set with simultaneous UCI transmission indication from among UCIs that are not selected from the K UCI; and

transmitting the selected UCI through one of a PUCCH and a Physical Uplink Shared CHannel (PUSCH) of a serving cell of the UCI.

5. The method as claimed in claim 4 , further comprising:

receiving, from the BS, a simultaneous UCI transmission indicator associated with a secondary cell, through an RRC or MAC signaling.

6. The method as claimed in claim 1 , wherein the selecting comprises excluding one or more UCIs set to be transmitted in a PUSCH among the UCIs.

7. The method as claimed in claim 1 , wherein the UE transmits a UCI of a secondary cell from among the UCIs through piggybacking in an allocated PUSCH resource.

8. A method of a Base Station (BS) for receiving uplink control information in a plurality of serving cells, the method comprising:

receiving, from a User Equipment (UE), M or fewer Uplink control informations (UCIs) through a Physical Uplink Control CHannel (PUCCH) of each serving cell, where M indicates a number of UCIs of available for simultaneous transmission; and

determining the UCIs,

wherein, when a number K of UCIs to be simultaneously transmitted by the UE is greater than the number M of UCIs available for simultaneous transmission, the UE selects one or less than K UCIs based on at least one of a priority set with each UCI and a Carrier Indicator Field (CIF) of a serving cell, and transmits the selected one or less than K UCIs through the PUCCH, and

wherein the number M is less than or equal to a number N of serving cells, and the number M is greater than or equal to 1.

9. The method as claimed in claim 8 , wherein the BS receives a UCI of a secondary cell from among the UCIs through piggybacking in a PUSCH resource allocated to the UE.

10. A User Equipment (UE) for controlling transmission of uplink control information in a plurality of serving cells, the UE comprising:

a receiving unit configured to receive a signal from a Base Station (BS);

a controller configured to compare a number K of UCIs to be simultaneously transmitted and a number M of UCIs available for simultaneous transmission and configured to select M UCIs from the UCIs to be simultaneously transmitted when the number K is greater than the number M; and

a transmitting unit configured to transmit the selected M UCIs to the BS through a Physical Uplink Control CHannel (PUCCH) of each serving cell,

wherein the number M is less than or equal to a number N of serving cells, and the number M is a natural number greater than or equal to 1; and

wherein the controller is configured to select UCIs from the K UCIs, based on at least one of a priority set with each UCI and a Carrier Indicator Field (CIF) of a serving cell.

11. The UE as claimed in claim 10 , wherein:

the serving cells are classified into two or more serving cell groups; and

the controller is configured to perform at least one of:

selecting UCIs based on CIFs of serving cells where uplink control information of the two or more serving cell groups are transmitted to; and

defining differential priorities of the serving cell groups and selecting UCIs based on the priorities of the serving cell groups.

12. The UE as claimed in claim 10 , wherein the priority is set based on a type of each UCI.

13. The UE as claimed in claim 10 , wherein the transmitting unit is configured to:

select a UCI set with simultaneous UCI transmission indication from among UCIs that are not selected from the K UCIs; and

transmit the UCI through a PUCCH or a Physical Uplink Shared CHannel (PUSCH) of a serving cell of the UCI.

14. The UE as claimed in claim 13 , wherein the receiving unit is configured to receive, from the BS, a simultaneous UCI transmission indicator associated with a secondary cell, through an RRC or MAC signaling.

15. The UE as claimed in claim 10 , wherein the controller is configured to exclude, from the selection, one or more UCIs, which are set to be transmitted in a PUSCH, from among the UCIs.

16. The UE as claimed in claim 10 , wherein the transmitting unit is configured to transmit a UCI of a secondary cell from the UCIs through piggybacking in a PUSCH resource allocated to the UE.

17. The method as claimed in claim 1 , wherein the selecting includes:

performing a first UCI selection based on the priority of each UCI; and

when UCIs having a same priority are associated with at least two serving cells, performing a second UCI selection between the UCIs having the same priority, based on CIFs of the at least two serving cells.

18. The method as claimed in claim 8 , the UE is configured to:

perform a first UCI selection based on the priority of each UCI; and

when UCIs having a same priority are associated with at least two serving cells, perform a second UCI selection between the UCIs having the same priority, based on CIFs of the at least two serving cells.

19. The UE as claimed in claim 10 , wherein the controller is configured to:

perform a first UCI selection based on the priority of each UCI; and

when UCIs having a same priority are associated with at least two serving cells, perform a second UCI selection between the UCIs having the same priority, based on CIFs of the at least two serving cells.