1. A method of wireless communications in a time division duplex (TDD) long term evolution (LTE) based network, comprising:', 'receiving, by a user equipment (UE) during a first subframe, an indication of a dynamic uplink / downlink (UL/DL) subframe configuration;', 'determining an uplink hybrid automatic repeat request (HARQ) timing based on an uplink reference subframe configuration and at least one of the dynamic UL/DL subframe configuration, a predetermined uplink index, or a downlink reference subframe configuration; and', 'selecting an uplink subframe for communication based on the determined uplink HARQ timing.

2. The method of claim 1 , wherein the selecting further comprises:', 'determining an uplink index based on the dynamic UL/DL subframe configuration, wherein the uplink subframe is selected based on the uplink index.

3. The method of claim 2, wherein the uplink index is a first value when the dynamic UL/DL subframe configuration indicates one or more subframe numbers are associated with a subframe for uplink, and the uplink index is a second value when the dynamic UL/DL subframe configuration indicates the one or more subframe numbers are not associated with the subframe for uplink.

4. The method of claim 2, wherein the receiving further comprises receiving downlink control information (DCI), the method further comprising:', 'interpreting a field in the DCI as the uplink index when the determined uplink HARQ reference configuration is a UL/DL subframe configuration and the dynamic UL/DL subframe configuration is the UL/DL subframe configuration; and', 'interpreting the field in the DCI as an uplink DAI when at least one of the determined uplink HARQ reference configuration or the dynamic UL/DL subframe configuration is not the UL/DL subframe configuration.

5. The method of claim 1, wherein the predetermined uplink index is assigned for a fixed downlink subframe in which the UE receives an uplink grant, the method further comprising:', 'determining an uplink subframe for the fixed downlink subframe based on the predetermined uplink index.

6. The method of claim 1 , further comprising:', 'receiving an uplink grant in a last downlink subframe of a downlink association set of the selected uplink subframe, wherein the last downlink subframe is determined based on the downlink reference subframe configuration.

7. The method of claim 6, wherein the last downlink subframe of the downlink association set is located subsequent to a fixed downlink subframe used to receive another uplink grant.

8. The method of claim 7, further comprising:', 'selecting one of the uplink grant from the last downlink subframe of the downlink association set or the other uplink grant from the fixed downlink subframe based on at least one of:', 'a time of decoding the uplink grant and a time of decoding the other uplink grant, or', 'an indicator in the dynamic UL/DL subframe configuration.

9. A method of wireless communications in a time division duplex (TDD) long term evolution (LTE) based network, comprising:', 'obtaining an uplink DAI value that represents a number of subframes up to an uplink grant subframe in which an uplink grant is received within a downlink', 'association set;', 'determining a new uplink DAI value by adding an offset value to the uplink DAI value, the offset value representing a number of downlink subframes subsequent to the uplink grant subframe within the downlink association set; and', 'transmitting one or more HARQ messages based on the determined new uplink DAI value

10. The method of claim 9, wherein the downlink subframes are determined by a dynamic UL/DL subframe configuration indicator

11. The method of claim 9, wherein a feedback HARQ-AC payload size for the downlink association set is determined by calculating a sum of a payload size of a first set and a payload size of a second set, the first set including the subframes up to the uplink grant subframe within the downlink association set and the second set including the downlink subframes subsequent to the uplink grant subframe within the downlink association set

12. A method of wireless communications in a time division duplex (TDD) long term evolution (LTE) based network, comprising:', 'determining at least one of a parameter for a hybrid automatic repeat request (HARQ) message bundling or a HARQ message codebook, wherein the parameter for the HARQ message bundling is determined based on a size of a downlink association set of subframes detected by a user equipment, and the HARQ message codebook is determined based on at least one of the size of the downlink association set of subframes or a size of a dynamic set of subframes excluding one or more flexible uplink subframes; and', 'transmitting one or more HARQ messages based on at least one of the parameter or the HARQ message codebook

13. The method of claim 12, wherein the one or more flexible uplink subframes are determined from a dynamic uplink/downlink subframe configuration

14. The method of claim 12, further comprising:', 'discarding an uplink DAI in an uplink grant,', 'wherein the one or more HARQ messages is transmitted without the uplink DAI

15. An apparatus for wireless communications in a time division duplex (TDD) long term evolution (LTE) based network, comprising:', 'means for receiving, by a user equipment (UE) during a first subframe, an indication of a dynamic uplink / downlink (UL/DL) subframe configuration;

means for determining an uplink hybrid automatic repeat request (HARQ) timing based on an uplink reference subframe configuration and at least one of the dynamic UL/DL subframe configuration, a predetermined uplink index, or a downlink reference subframe configuration; and', 'means for selecting an uplink subframe for communication based on the determined uplink HARQ timing

16. The apparatus of claim 15, wherein the means for selecting is further configured to determine an uplink index based on the dynamic UL/DL subframe configuration, wherein the uplink subframe is selected based on the uplink index

17. The apparatus of claim 16, wherein the uplink index is a first value when the dynamic UL/DL subframe configuration indicates one or more subframe numbers are associated with a subframe for uplink, and the uplink index is a second value when the dynamic UL/DL subframe configuration indicates the one or more subframe numbers are not associated with the subframe for uplink

18. The apparatus of claim 16, wherein the means for receiving is further configured to receive downlink control information (DCI), the apparatus further comprising:', 'means for interpreting a field in the DCI as the uplink index when the determined uplink HARQ reference configuration is a UL/DL subframe configuration and the dynamic UL/DL subframe configuration is the UL/DL subframe configuration; and', 'means for interpreting the field in the DCI as an uplink DAI when at least one of the determined uplink HARQ reference configuration or the dynamic UL/DL subframe configuration is not the UL/DL subframe configuration

19. The apparatus of claim 15, wherein the predetermined uplink index is assigned for a fixed downlink subframe in which the UE receives an uplink grant, the apparatus further comprising:', 'means for determining an uplink subframe for the fixed downlink subframe based on the predetermined uplink index.

20. The apparatus of claim 15, further comprising:', 'means for receiving an uplink grant in a last downlink subframe of a downlink association set of the selected uplink subframe, wherein the last downlink subframe is determined based on the downlink reference subframe configuration.

21. The apparatus of claim 20, wherein the last downlink subframe of the downlink association set is located subsequent to a fixed downlink subframe used to receive another uplink grant.

22. The apparatus of claim 21 , further comprising:', 'means for selecting one of the uplink grant from the last downlink subframe of the downlink association set or the other uplink grant from the fixed downlink subframe based on at least one of:', 'a time of decoding the uplink grant and a time of decoding the other uplink grant, or', 'an indicator in the dynamic UL/DL subframe configuration.

23. An apparatus for wireless communications in a time division duplex (TDD) long term evolution (LTE) based network, comprising:', 'means for obtaining an uplink DAI value that represents a number of subframes up to an uplink grant subframe in which an uplink grant is received within a downlink association set;', 'means for determining a new uplink DAI value by adding an offset value to the uplink DAI value, the offset value representing a number of subframes subsequent to the uplink grant subframe within the downlink association set; and', 'means for transmitting one or more HARQ messages based on the determined new UL DAI value.

24. The apparatus of claim 23, wherein the downlink subframes are determined by a dynamic UL/DL subframe configuration indicator.

25. The apparatus of claim 23, wherein a feedback HARQ-ACK payload size for the downlink association set is determined by calculating a sum of a payload size of a first set and a

payload size of a second set, the first set including the subframes up to the uplink grant subframe within the downlink association set and the second set including the downlink subframes subsequent to the uplink grant subframe within the downlink association set.

26. An apparatus for wireless communications in a time division duplex (TDD) long term evolution (LTE) based network, comprising:', 'means for determining at least one of a parameter for a hybrid automatic repeat request (HARQ) message bundling or a HARQ message codebook, wherein the parameter for the HARQ message bundling is determined based on a size of a downlink association set of subframes detected by a user equipment, and the HARQ message codebook is determined based on at least one of the size of the downlink association set of subframes or a size of a dynamic set of subframes excluding one or more flexible uplink subframes; and', 'means for transmitting one or more HARQ messages based on at least one of the parameter or the HARQ message codebook.

27. The apparatus of claim 26, wherein the one or more flexible uplink subframes are determined from a dynamic uplink/downlink subframe configuration.

28. The apparatus of claim 26, further comprising:', 'means for discarding an uplink DAI in an uplink grant,', 'wherein the one or more HARQ messages is transmitted without the uplink DAI.

29. An apparatus for wireless communications in a time division duplex (TDD) long term evolution (LTE) based network, comprising:', 'a memory; and', 'at least one processor coupled to the memory and configured to:', 'receive, by a user equipment (UE) during a first subframe, an indication of a dynamic uplink / downlink (UL DL) subframe configuration; determine an uplink hybrid automatic repeat request (HARQ) timing based on an uplink reference subframe configuration and at least one of the dynamic UL/DL subframe configuration, a predetermined uplink index, or a downlink reference subframe configuration; and

select an uplink subframe for communication based on the determined uplink HARQ timing.

30. The apparatus of claim 29, wherein the at least one processor is configured to select the uplink subframe by determining an uplink index based on the dynamic UL/DL subframe configuration, wherein the uplink subframe is selected based on the uplink index.

31. The apparatus of claim 30, wherein the uplink index is a first value when the dynamic UL/DL subframe configuration indicates one or more subframe numbers are associated with a subframe for uplink, and the uplink index is a second value when the dynamic UL/DL subframe configuration indicates the one or more subframe numbers are not associated with the subframe for uplink.

32. The apparatus of claim 30, wherein the at least one processor is further configured to receive downlink control information (DO), the at least one processor being further configured to:', 'interpret a field in the DCI as the uplink index when the determined uplink HARQ reference configuration is a UL/DL subframe configuration and the dynamic UL/DL subframe configuration is the UL/DL subframe configuration; and', 'interpret the field in the DCI as an uplink DAI when at least one of the determined uplink HARQ reference configuration or the dynamic UL/DL subframe configuration is not the UL/DL subframe configuration.

33. The apparatus of claim 29, wherein the predetermined uplink index is assigned for a fixed downlink subframe in which the UE receives an uplink grant, the at least one processor being further configured to:', 'determine an uplink subframe for the fixed downlink subframe based on the predetermined uplink index.

34. The apparatus of claim 29, wherein the at least one processor is further configured to:', 'receive an uplink grant in a last downlink subframe of a downlink association set

of the selected uplink subframe, wherein the last downlink subframe is determined based on the downlink reference subframe configuration.

35. The apparatus of claim 34, wherein the last downlink subframe of the downlink association set is located subsequent to a fixed downlink subframe used to receive another uplink grant.

36. The apparatus of claim 35, wherein the at least one processor is further configured to:', 'select one of the uplink grant from the last downlink subframe of the downlink association set or the other uplink grant from the fixed downlink subframe based on at least one of:', 'a time of decoding the uplink grant and a time of decoding the other uplink grant, or', 'an indicator in the dynamic UL/DL subframe configuration.

37. An apparatus for wireless communications in a time division duplex (TDD) long term evolution (LTE) based network, comprising:', 'a memory; and', 'at least one processor coupled to the memory and configured to:', 'obtain an uplink DAI value that represents a number of subframes up to an uplink grant subframe in which an uplink grant is received within a downlink association set;', 'determine a new uplink DAI value by adding an offset value to the uplink DAI value, the offset value representing a number of subframes subsequent to the uplink grant subframe within the downlink association set; and', 'transmit one or more HA Q messages based on the determined new UL DAI value.

38. The apparatus of claim 23, wherein the downlink subframes are determined by a dynamic UL/DL subframe configuration indicator.

39. The apparatus of claim 23, wherein a feedback HARQ-ACK payload size for the downlink association set is determined by calculating a sum of a payload size of a first set and a payload size of a second set, the first set including the subframes up to the uplink grant subframe within the downlink association set and the second set including the downlink subframes subsequent to the uplink grant subframe within the downlink association set.

40. An apparatus for wireless communications in a time division duplex (TDD) long term evolution (LTE) based network, comprising:', 'a memory; and', 'at least one processor coupled to the memory and configured to:', 'determine at least one of a parameter for a hybrid automatic repeat request (HARQ) message bundling or a HARQ message codebook, wherein the parameter for the HARQ message bundling is determined based on a size of a downlink association set of subframes detected by a user equipment, and the HARQ message codebook is determined based on at least one of the size of the downlink association set of subframes or a size of a dynamic set of subframes excluding one or more flexible uplink subframes; and transmit one or more HARQ messages based on at least one of the parameter or the HARQ message codebook. 1. The apparatus of claim 39, wherein the one or more flexible uplink subframes are determined from a dynamic uplink/downlink subframe configuration.

42. The apparatus of claim 39, wherein the at least one processor is further configured to:', 'discard an uplink DAI in an uplink grant,', 'wherein the one or more HARQ messages is transmitted without the uplink DAI.

43. A computer program product, comprising:', 'a computer-readable medium comprising code for:', 'receiving, by a user equipment (UE) during a first subframe, an indication of a dynamic uplink / downlink (UL/DL) subframe configuration;

determining an uplink hybrid automatic repeat request (HARQ) timing based on an uplink reference subframe configuration and at least one of the dynamic UL/DL subframe configuration, a predetermined uplink index, or a downlink reference subframe configuration; and', 'selecting an uplink subframe for communication based on the determined uplink HARQ timing.

44. The computer program product of claim 43, wherein the selecting further comprises:', 'determining an uplink index based on the dynamic UL/DL subframe', 'configuration, wherein the uplink subframe is selected based on the uplink index.

45. The computer program product of claim 44, wherein the uplink index is a first value when the dynamic UL/DL subframe configuration indicates one or more subframe numbers are associated with a subframe for uplink, and the uplink index is a second value when the dynamic UL/DL subframe configuration indicates the one or more subframe numbers are not associated with the subframe for uplink.

46. The computer program product of claim 44, wherein the receiving further comprises receiving downlink control information (DCI), the computer program product further comprising:', 'interpreting a field in the DCI as the uplink index when the determined uplink HARQ reference configuration is a UL/DL subframe configuration and the dynamic UL/DL subframe configuration is the UL/DL subframe configuration; and', 'interpreting the field in the DCI as an uplink DAI when at least one of the determined uplink HARQ reference configuration or the dynamic UL/DL subframe configuration is not the UL/DL subframe configuration.

47. The computer program product of claim 43, wherein the predetermined uplink index is assigned for a fixed downlink subframe in which the UE receives an uplink grant, the computer program product further comprising:', 'determining an uplink subframe for the fixed downlink subframe based on the predetermined uplink index.

48. The computer program product of claim 43, further comprising:', 'receiving an uplink grant in a last downlink subframe of a downlink association set of the selected uplink subframe, wherein the last downlink subframe is determined based on the downlink reference subframe configuration.

49. The computer program product of claim 48, wherein the last downlink subframe of the downlink association set is located subsequent to a fixed downlink subframe used to receive another uplink grant.

50. The computer program product of claim 49, further comprising:', 'selecting one of the uplink grant from the last downlink subframe of the downlink association set or the other uplink grant from the fixed downlink subframe based on at least one of:', 'a time of decoding the uplink grant and a time of decoding the other uplink grant, or', 'an indicator in the dynamic UL/DL subframe configuration.

51. A computer program product, comprising:', 'a computer-readable medium comprising code for:', 'obtaining an uplink DAI value that represents a number of subframes up to an uplink grant subframe in which an uplink grant is received within a downlink association set;', 'determining a new uplink DAI value by adding an offset value to the uplink DAI value, the offset value representing a number of subframes subsequent to the uplink grant subframe within the downlink association set; and', 'transmitting one or more HARQ messages based on the determined new UL DAI value.

52. The computer program product of claim 51 , wherein the downlink subframes are determined by a dynamic UL/DL subframe configuration indicator.

53. The computer program product of claim 51 , wherein a feedback HA Q-ACK payload size for the downlink association set is determined by calculating a sum of a payload size of a first set and a payload size of a second set, the first set including the subframes up to the uplink grant subframe within the downlink association set and the second set including the downlink subframes subsequent to the uplink grant subframe within the downlink association set.

54. A computer program product, comprising:', 'a computer-readable medium comprising code for:', 'determining at least one of a parameter for a hybrid automatic repeat request (HARQ) message bundling or a HARQ message codebook, wherein the parameter for the HARQ message bundling is determined based on a size of a downlink association set of subframes detected by a user equipment, and the HARQ message codebook is determined based on at least one of the size of the downlink association set of subframes or a size of a dynamic set of subframes excluding one or more flexible uplink subframes; and', 'transmitting one or more HARQ messages based on at least one of the parameter or the HARQ message codebook.

55. The computer program product of claim 54, wherein the one or more flexible uplink subframes are determined from a dynamic uplink downlink subframe', 'configuration.

56. The computer program product of claim 54, further comprising:', 'discarding an uplink DAI in an uplink grant,', 'wherein the one or more HARQ messages is transmitted without the uplink DAI.']