PUCCH resource mapping and HARQ-ACK feedback

1. A method for wireless communication by a user equipment (UE), comprising:

receiving signaling indicating a dynamic uplink-downlink (UL-DL) subframe configuration;

determining hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) timing based on the dynamic UL-DL subframe configuration and a resource offset, wherein the dynamic UL-DL subframe configuration includes a plurality of consecutive UL subframes, and wherein determining the HARQ ACK/NACK timing comprises determining a subframe in which to transmit the HARQ ACK/NACK based on a number of the plurality of consecutive UL subframes in the dynamic UL-DL subframe configuration;

determining HARQ resource allocation for a physical uplink control channel (PUCCH) based on the dynamic UL-DL subframe configuration, wherein the HARQ resource allocation comprises an allocation of frequency resources on which the PUCCH is to be transmitted; and

transmitting a HARQ ACK/NACK on the PUCCH based on the determined HARQ resource allocation and HARQ ACK/NACK timing.

2. The method of claim 1 , wherein determining HARQ resource allocation based on the dynamic UL-DL subframe configuration comprises determining a HARQ-ACK codebook size based on the dynamic UL-DL subframe configuration.

3. The method of claim 2 , wherein at least one of the codebook size or a number of ACK/NACK bits is determined based on a size of a DL association set of the dynamic UL-DL subframe configuration.

4. The method of claim 1 , wherein determining HARQ resource allocation based on the dynamic UL-DL subframe configuration comprises determining physical uplink control channel (PUCCH) resource allocation based on the dynamic UL-DL subframe configuration.

5. The method of claim 4 , wherein the physical uplink control channel (PUCCH) resource allocation is determined based on a size of a DL association set of the dynamic UL-DL subframe configuration.

6. The method of claim 5 , wherein flexible subframes in a bundling set not configured as DL in the dynamic UL-DL configuration are not counted when determining the size of the DL association set.

7. The method of claim 6 , further comprising determining a packing order of remaining DL subframes in the bundling set by removing UL subframes.

8. The method of claim 7 , wherein fixed DL subframes are mapped first in the packing order of the remaining DL subframes.

9. The method of claim 4 , wherein separate PUCCH regions are configured for UEs capable of supporting dynamic UL-DL subframe configuration and UEs not capable of supporting dynamic UL-DL subframe configuration.

10. The method of claim 9 , further comprising determining whether a potential collision exists between the PUCCH region for UEs capable of dynamic UL-DL subframe configuration and the PUCCH region for UEs not capable of supporting dynamic UL-DL subframe configuration.

11. The method of claim 10 , further comprising:

using the PUCCH region for UEs not capable of supporting dynamic UL-DL subframe configuration if no potential collision is detected.

12. The method of claim 10 , wherein the resource offset comprises:

a first offset value if no potential collision is detected; and

a second offset value if a potential collision is detected.

13. The method of claim 4 , wherein the signaling indicating a dynamic uplink-downlink (UL-DL) subframe configuration comprises dynamic signaling.

14. The method of claim 13 , wherein the dynamic signaling is conveyed via at least one of:

one or more bits in a downlink control information (DCI) format used for transmit power control (TPC) commands, or

one or more acknowledgement resource offset (ARO) bits.

15. The method of claim 1 , further comprising:

detecting a missed dynamic UL-DL subframe configuration; and

in response to the detection, determining HARQ resource allocation based on an UL-DL subframe configuration signaled in a system information block (SIB).

16. An apparatus for wireless communications, comprising:

means for receiving signaling indicating a dynamic uplink-downlink (UL-DL) subframe configuration;

means for determining hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) timing based on the dynamic UL-DL subframe configuration and a resource offset, wherein the dynamic UL-DL subframe configuration includes a plurality of consecutive UL subframes, and wherein determining the HARQ ACK/NACK timing comprises determining a subframe in which to transmit the HARQ ACK/NACK based on a number of the plurality of consecutive UL subframes in the dynamic UL-DL subframe configuration;

means for determining HARQ resource allocation for a physical uplink control channel (PUCCH) based on the dynamic UL-DL subframe configuration, wherein the HARQ resource allocation comprises an allocation of frequency resources on which the PUCCH is to be transmitted; and

means for transmitting a HARQ ACK/NACK on the PUCCH based on the determined HARQ resource allocation and HARQ ACK/NACK timing.

17. The apparatus of claim 16 , wherein determining HARQ resource allocation based on the dynamic UL-DL subframe configuration comprises determining a HARQ-ACK codebook size based on the dynamic UL-DL subframe configuration.

18. The apparatus of claim 16 , wherein determining HARQ resource allocation based on the dynamic UL-DL subframe configuration comprises determining physical uplink control channel (PUCCH) resource allocation based on the dynamic UL-DL subframe configuration.

19. The apparatus of claim 18 , wherein the physical uplink control channel (PUCCH) resource allocation is determined based on a size of a DL association set of the dynamic UL-DL subframe configuration, wherein flexible subframes in a bundling set not configured as DL in the dynamic UL-DL configuration are not counted when determining the size of the DL association set, and wherein the apparatus further comprises means for determining a packing order of remaining DL subframes in the bundling set by removing UL subframes.

20. The apparatus of claim 18 , wherein separate PUCCH regions are configured for UEs capable of supporting dynamic UL-DL subframe configuration and UEs not capable of supporting dynamic UL-DL subframe configuration, and wherein the apparatus further comprises means for determining whether a potential collision exists between the PUCCH region for UEs capable of dynamic UL-DL subframe configuration and the PUCCH region for UEs not capable of supporting dynamic UL-DL subframe configuration.

21. The apparatus of claim 20 , wherein the resource offset comprises:

a first value if no potential collision is detected; and

a second offset value if a potential collision is detected.

22. The apparatus of claim 18 , wherein the signaling indicating a dynamic uplink-downlink (UL-DL) subframe configuration comprises dynamic signaling, and wherein the dynamic signaling is conveyed via at least one of:

one or more bits in a downlink control information (DCI) format used for transmit power control (TPC) commands, or

one or more acknowledgment resource offset (ARO) bits.

23. The apparatus of claim 16 , further comprising:

means for detecting a missed dynamic UL-DL subframe configuration; and

means for determining, in response to the detection, HARQ resource allocation based on an UL-DL subframe configuration signaled in a system information block (SIB).

24. An apparatus for wireless communications, comprising:

means for receiving signaling indicating a dynamic uplink-downlink (UL-DL) subframe configuration;

means for determining hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) timing based on the dynamic UL-DL subframe configuration, wherein the dynamic UL-DL subframe configuration includes a plurality of consecutive UL subframes, and wherein determining the HARQ ACK/NACK timing comprises determining a subframe in which to transmit the HARQ ACK/NACK based on a number of the plurality of consecutive UL subframes in the dynamic UL-DL subframe configuration;

means for determining HARQ resource allocation for a physical uplink control channel (PUCCH) based on the dynamic UL-DL subframe configuration, wherein separate PUCCH regions are configured for UEs capable of supporting dynamic UL-DL subframe configuration and UEs not capable of supporting dynamic UL-DL subframe configuration, and wherein the HARQ resource allocation comprises an allocation of frequency resources on which the PUCCH is to be transmitted;

means for determining whether a potential collision exists between the HARQ resource allocation and the PUCCH region for UEs not capable of supporting dynamic UL-DL subframe configuration;

means for using the PUCCH region for UEs not capable of supporting dynamic UL-DL subframe configuration for communications between the UE and a base station if no potential collision is determined; and

means for transmitting HARQ ACK/NACK on the PUCCH based on the HARQ ACK/NACK timing and HARQ resource allocation.

25. An apparatus for wireless communications, comprising:

means for transmitting, to a user equipment (UE), signaling indicating a dynamic uplink-downlink (UL-DL) subframe configuration;

means for determining hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) timing for the UE based on the dynamic UL-DL subframe configuration, wherein the dynamic UL-DL subframe configuration includes a plurality of consecutive UL subframes, and wherein determining the HARQ ACK/NACK timing comprises determining a subframe in which to transmit the HARQ ACK/NACK based on a number of the plurality of consecutive UL subframes in the dynamic UL-DL subframe configuration;

means for determining HARQ resource allocation for a physical uplink control channel for the UE based on the dynamic UL-DL subframe configuration, wherein separate PUCCH regions are configured for UEs capable of supporting dynamic UL-DL subframe configuration and UEs not capable of supporting dynamic UL-DL subframe configuration, and wherein the HARQ resource allocation comprises an allocation of frequency resources on which the PUCCH is to be transmitted;

means for determining whether a potential collision exists between the determined HARQ resource allocation and the PUCCH region for UEs not capable of supporting dynamic UL-DL subframe configuration, wherein the PUCCH region for UEs not capable of supporting dynamic UL-DL subframe configuration is used for communications between the BS and both UEs not capable of supporting dynamic UL-DL subframe configuration and UEs capable of supporting dynamic UL-DL subframe configuration if no potential collision is determined; and

means for receiving HARQ ACK/NACK on the PUCCH from the UE based on the determined HARQ resource allocation and HARQ ACK/NACK timing.