Resource indexing for acknowledgement signals in response to receptions of multiple assignments

1. A method for transmitting, by a user equipment, a hybrid automatic repeat request acknowledgement (HARQ-ACK), the method comprising:

identifying power of the HARQ-ACK based on transmission power control information in first downlink control information for a primary cell;

identifying, for frequency division duplexing (FDD) and a plurality of configured cells, a resource for transmission of the HARQ-ACK based on transmission power control information in second downlink control information for a secondary cell; and

transmitting the HARQ-ACK based on the resource on the primary cell.

2. The method of claim 1 , wherein the transmission power control information in the second downlink control information indicates the resource among a set of resources configured by a base station.

3. The method of claim 2 , wherein the user equipment assumes that the resource is the same for all second downlink control information used to identify the resource.

4. The method of claim 1 , wherein bits of the HARQ-ACK for all cells are jointly coded.

5. The method of claim 1 , wherein the resource is used for resource selection.

6. A method for receiving, by a base station, a hybrid automatic repeat request acknowledgement (HARQ-ACK), the method comprising:

transmitting transmission power control information in first downlink control information for a primary cell for power of the HARQ-ACK;

transmitting, for frequency division duplexing (FDD) and a plurality of configured cells, transmission power control information in second downlink control information for a secondary cell for a resource for transmission of the HARQ-ACK; and

receiving the HARQ-ACK based on the resource on the primary cell.

7. The method of claim 6 , wherein the transmission power control information in the second downlink control information indicates the resource among a set of resources configured by a base station.

8. The method of claim 7 , wherein the resource is the same for all second downlink control information used to identify the resource by a user equipment.

9. The method of claim 6 , wherein bits of the HARQ-ACK for all cells are jointly coded.

10. The method of claim 6 , wherein the resource is used for resource selection.

11. An apparatus of a user equipment for transmitting, a hybrid automatic repeat request acknowledgement (HARQ-ACK), the apparatus comprising:

a controller configured to identify power of the HARQ-ACK based on transmission power control information in first downlink control information for a primary cell, and identify, for frequency division duplexing (FDD) and a plurality of configured cells, a resource for transmission of the HARQ-ACK based on transmission power control information in second downlink control information for a secondary cell; and

a transmitter configured to transmit the HARQ-ACK based on the resource on the primary cell.

12. The apparatus of claim 11 , wherein the transmission power control information in the second downlink control information indicates the resource among a set of resources configured by a base station.

13. The apparatus of claim 12 , wherein the user equipment assumes that the resource is the same for all second downlink control information used to identify the resource.

14. The apparatus of claim 11 , wherein bits of the HARQ-ACK for all cells are jointly coded.

15. The apparatus of claim 11 , wherein the resource is used for resource selection.

16. An apparatus of a base station for receiving a hybrid automatic repeat request acknowledgement (HARQ-ACK), the apparatus comprising:

a transmitter configured to transmit transmission power control information in first downlink control information for a primary cell for power of the HARQ-ACK, and transmit, for frequency division duplexing (FDD) and a plurality of configured cells, transmission power control information in second downlink control information for a secondary cell for a resource for transmission of the HARQ-ACK; and

a receiver configured to receive the HARQ-ACK based on the resource on the primary cell.

17. The apparatus of claim 16 , wherein the transmission power control information in the second downlink control information indicates the resource among a set of resources configured by a base station.

18. The apparatus of claim 17 , wherein the resource is the same for all second downlink control information used to identify the resource by a user equipment.

19. The apparatus of claim 16 , wherein bits of the HARQ-ACK for all cells are jointly coded.

20. The apparatus of claim 16 , wherein the resource is used for resource selection.