Time domain resource allocation-based HARQ-ACK feedback generation

1. A method of wireless communication at a user equipment (UE), comprising:

determining that at least one time-domain resource allocation (TDRA) candidate of a set of TDRA candidates for receiving a physical downlink shared channel (PDSCH) from a base station has more than one possible location within a slot; and

generating hybrid automatic repeat request (HARQ) acknowledgement (ACK) (HARQ-ACK) feedback based on the determination that the at least one TDRA candidate has more than one possible location within the slot,

wherein the HARQ-ACK feedback is based on a plurality of TDRA candidates that include a first number of TDRA candidates of the at least one TDRA candidate that has more than one possible location within the slot and a second number of TDRA candidates corresponding to an additional location of the at least one TDRA candidate within the slot.

2. The method of claim 1 , further comprising:

receiving a PDSCH in each of one or more TDRA candidates of the set of TDRA candidates, wherein the HARQ-ACK feedback is generated based on the PDSCH in the one or more TDRA candidates; and

transmitting the generated HARQ-ACK feedback to the base station.

3. The method of claim 1 , wherein the HARQ-ACK feedback is based on a type 1 HARQ-ACK codebook (CB).

4. The method of claim 1 , wherein the determining that the at least one TDRA candidate has more than one possible location within the slot comprises:

determining that the UE is configured to monitor for a downlink (DL) grant in a DL control information (DCI) format 1_2 message;

determining that a starting symbol for determining at least one location of the at least one TDRA within the slot is configured based on at least one physical downlink control channel (PDCCH) monitoring occasion within the slot when the UE is configured to monitor for the DL grant in the DCI format 1_2 message; and

determining that the at least one TDRA candidate has more than one possible location within the slot when the UE determines that the starting symbol for determining the at least one location of the at least one TDRA within the slot is configured based on the at least one PDCCH monitoring occasion within the slot.

5. The method of claim 4 , wherein the UE is configured to monitor for the DL grant through a radio resource control (RRC) parameter.

6. The method of claim 4 , wherein the determining that the at least one TDRA candidate has more than one possible location within the slot comprises determining that there is a plurality of PDCCH monitoring occasions within the slot in which a DCI format 1_2 message is configured to be received.

7. The method of claim 4 , wherein the determining that the at least one TDRA candidate has more than one possible location within the slot comprises determining that a K 0 slot offset associated with each of the at least one TDRA candidate is equal to 0.

8. The method of claim 1 , wherein the generating the HARQ-ACK feedback comprises:

determining a number of physical downlink control channel (PDCCH) monitoring occasions within the slot;

determining, based on the number of PDCCH monitoring occasions, the first number of TDRA candidates of the at least one TDRA candidate that has more than one possible location within the slot; and

determining a total number of TDRA candidates within the slot, the total number of TDRA candidates within the slot including the first number of TDRA candidates within the slot, the second number of TDRA candidates corresponding to the additional location of the at least one TDRA candidate within the slot, and a third number of TDRA candidates with one possible location within the slot,

wherein the HARQ-ACK feedback is generated based on the total number of TDRA candidates.

9. The method of claim 8 , further comprising determining a total number of non-overlapping TDRA candidates within the slot based on the total number of TDRA candidates, wherein the HARQ-ACK feedback is generated to include x bits, where x is equal to the total number of non-overlapping TDRA candidates.

10. The method of claim 8 , further comprising determining the second number of TDRA candidates corresponding to the additional location of the at least one TDRA candidate that are fully contained within the slot.

11. The method of claim 1 , wherein a number of physical downlink control channel (PDCCH) monitoring occasions within the slot includes a first PDCCH monitoring occasion at a first starting symbol S 0 >0, the additional location of the at least one TDRA candidate within the slot each corresponding to a second starting symbol equal to S 0 plus a starting symbol S of the at least one TDRA candidate.

12. A method of wireless communication at a base station, comprising:

determining that at least one time-domain resource allocation (TDRA) candidate of a set of TDRA candidates for transmitting a physical downlink shared channel (PDSCH) to a user equipment (UE) has more than one possible location within a slot; and

receiving hybrid automatic repeat request (HARD) acknowledgement (ACK) (HARQ-ACK) feedback from the UE based on the determination that the at least one TDRA candidate has more than one possible location within the slot,

wherein the HARQ-ACK feedback is based on a plurality of TDRA candidates that include a first number of TDRA candidates of the at least one TDRA candidate that has more than one possible location within the slot and a second number of TDRA candidates corresponding to an additional location of the at least one TDRA candidate within the slot.

13. The method of claim 12 , further comprising:

transmitting a PDSCH in each of one or more TDRA candidates of the set of TDRA candidates, wherein the HARQ-ACK feedback is received based on the PDSCH in the one or more TDRA candidates; and

decoding the HARQ-ACK feedback received from the UE.

14. The method of claim 12 , wherein the HARQ-ACK feedback is based on a type 1 HARQ-ACK codebook (CB).

15. The method of claim 12 , wherein the determining that the at least one TDRA candidate has more than one possible location within the slot comprises:

determining that the UE is configured to monitor for a downlink (DL) grant in a DL control information (DCI) format 1_2 message;

determining that a starting symbol for determining at least one location of the at least one TDRA within the slot is configured based on at least one physical downlink control channel (PDCCH) monitoring occasion within the slot when the UE is determined to be configured to monitor for the DL grant in the DCI format 1_2 message; and

determining that the at least one TDRA candidate has more than one possible location within the slot when the starting symbol for determining the at least one location of the at least one TDRA within the slot is configured based on the at least one PDCCH monitoring occasion within the slot.

16. The method of claim 15 , wherein the UE is configured to monitor for the DL grant through a radio resource control (RRC) parameter.

17. The method of claim 15 , wherein the determining that the at least one TDRA candidate has more than one possible location within the slot comprises determining that there is a plurality of PDCCH monitoring occasions within the slot in which a DCI format 1_2 message is configured to be transmitted.

18. The method of claim 15 , wherein the determining that the at least one TDRA candidate has more than one possible location within the slot comprises determining that a K 0 slot offset associated with each of the at least one TDRA candidate is equal to 0.

19. The method of claim 12 , wherein receiving the HARQ-ACK feedback comprises:

determining a number of physical downlink control channel (PDCCH) monitoring occasions within the slot;

determining, based on the number of PDCCH monitoring occasions, the first number of TDRA candidates of the at least one TDRA candidate that has more than one possible location within the slot; and

determining a total number of TDRA candidates within the slot, the total number of TDRA candidates within the slot including the first number of TDRA candidates within the slot, the second number of TDRA candidates corresponding to the additional location of the at least one TDRA candidate within the slot, and a third number of TDRA candidates with one possible location within the slot,

wherein the HARQ-ACK feedback is received based on the total number of TDRA candidates.

20. The method of claim 19 , further comprising determining a total number of non-overlapping TDRA candidates within the slot based on the total number of TDRA candidates, wherein the HARQ-ACK feedback is received via x bits, where x is equal to the total number of non-overlapping TDRA candidates.

21. The method of claim 19 , further comprising determining the second number of TDRA candidates corresponding to the additional location of the at least one TDRA candidate that are fully contained within the slot.

22. The method of claim 12 , wherein a number of physical downlink control channel (PDCCH) monitoring occasions within the slot includes a first PDCCH monitoring occasion at a first starting symbol S 0 >0, the additional location of the at least one TDRA candidate within the slot each corresponding to a second starting symbol equal to S 0 plus a starting symbol S of the at least one TDRA candidate.

23. An apparatus for wireless communication at a user equipment (UE), comprising:

a memory; and

at least one processor coupled to the memory and configured to:

determine that at least one time-domain resource allocation (TDRA) candidate of a set of TDRA candidates for receiving a physical downlink shared channel (PDSCH) from a base station has more than one possible location within a slot; and

generate hybrid automatic repeat request (HARQ) acknowledgement (ACK) (HARQ-ACK) feedback based on the determination that the at least one TDRA candidate has more than one possible location within the slot,

wherein the HARQ-ACK feedback is based on a plurality of TDRA candidates that include a first number of TDRA candidates of the at least one TDRA candidate that has more than one possible location within the slot and a second number of TDRA candidates corresponding to an additional location of the at least one TDRA candidate within the slot.

24. The apparatus of claim 23 , wherein the at least one processor is further configured to:

receive a PDSCH in each of one or more TDRA candidates of the set of TDRA candidates, wherein the HARQ-ACK feedback is generated based on the PDSCH in the one or more TDRA candidates; and

transmit the generated HARQ-ACK feedback to the base station.

25. The apparatus of claim 23 , wherein the HARQ-ACK feedback is based on a type 1 HARQ-ACK codebook (CB).

26. The apparatus of claim 23 , wherein to determine that the at least one TDRA candidate has more than one possible location within the slot the at least one processor is further configured to:

determine that the UE is configured to monitor for a downlink (DL) grant in a DL control information (DCI) format 1_2 message;

determine that a starting symbol for determining at least one location of the at least one TDRA within the slot is configured based on at least one physical downlink control channel (PDCCH) monitoring occasion within the slot when the UE is configured to monitor for the DL grant in the DCI format 1_2 message; and

determine that the at least one TDRA candidate has more than one possible location within the slot when the UE determines that the starting symbol for determining the at least one location of the at least one TDRA within the slot is configured based on the at least one PDCCH monitoring occasion within the slot.

27. The apparatus of claim 26 , wherein the UE is configured to monitor for the DL grant through a radio resource control (RRC) parameter.

28. The apparatus of claim 26 , wherein to determine that the at least one TDRA candidate has more than one possible location within the slot the at least one processor is further configured to determine that there is a plurality of PDCCH monitoring occasions within the slot in which a DCI format 1_2 message is configured to be received.

29. The apparatus of claim 26 , wherein to determine that the at least one TDRA candidate has more than one possible location within the slot the at least one processor is further configured to determine that a K 0 slot offset associated with each of the at least one TDRA candidate is equal to 0.

30. The apparatus of claim 23 , wherein to generate the HARQ-ACK feedback the at least one processor is further configured to:

determine a number of physical downlink control channel (PDCCH) monitoring occasions within the slot;

determine, based on the number of PDCCH monitoring occasions, the first number of TDRA candidates of the at least one TDRA candidate that has more than one possible location within the slot; and

determine a total number of TDRA candidates within the slot, the total number of TDRA candidates within the slot including the first number of TDRA candidates within the slot, the second number of TDRA candidates corresponding to the additional location of the at least one TDRA candidate within the slot, and a third number of TDRA candidates with one possible location within the slot,

wherein the HARQ-ACK feedback is generated based on the total number of TDRA candidates.

31. The apparatus of claim 30 , wherein the at least one processor is further configured to determine a total number of non-overlapping TDRA candidates within the slot based on the total number of TDRA candidates, wherein the HARQ-ACK feedback is generated to include x bits, where x is equal to the total number of non-overlapping TDRA candidates.

32. The apparatus of claim 30 , wherein the at least one processor is further configured to determine the second number of TDRA candidates corresponding to the additional location of the at least one TDRA candidate that are fully contained within the slot.

33. The apparatus of claim 23 , wherein a number of physical downlink control channel (PDCCH) monitoring occasions within the slot includes a first PDCCH monitoring occasion at a first starting symbol S 0 >0, the additional location of the at least one TDRA candidate within the slot each corresponding to a second starting symbol equal to S 0 plus a starting symbol S of the at least one TDRA candidate.

34. An apparatus for wireless communication at a base station, comprising:

a memory; and

at least one processor coupled to the memory and configured to:

determine that at least one time-domain resource allocation (TDRA) candidate of a set of TDRA candidates for transmitting a physical downlink shared channel (PDSCH) to a user equipment (UE) has more than one possible location within a slot; and

receive hybrid automatic repeat request (HARQ) acknowledgement (ACK) (HARQ-ACK) feedback from the UE based on the determination that the at least one TDRA candidate has more than one possible location within the slot,

wherein the HARQ-ACK feedback is based on a plurality of TDRA candidates that include a first number of TDRA candidates of the at least one TDRA candidate that has more than one possible location within the slot and a second number of TDRA candidates corresponding to an additional location of the at least one TDRA candidate within the slot.

35. The apparatus of claim 34 , wherein the at least one processor is further configured to:

transmit a PDSCH in each of one or more TDRA candidates of the set of TDRA candidates, wherein the HARQ-ACK feedback is received based on the PDSCH in the one or more TDRA candidates; and

decode the HARQ-ACK feedback received from the UE.

36. The apparatus of claim 34 , wherein the HARQ-ACK feedback is based on a type 1 HARQ-ACK codebook (CB).

37. The apparatus of claim 34 , wherein to determine that the at least one TDRA candidate has more than one possible location within the slot, the at least one processor is further configured to:

determine that the UE is configured to monitor for a downlink (DL) grant in a DL control information (DCI) format 1_2 message;

determine that a starting symbol for determining at least one location of the at least one TDRA within the slot is configured based on at least one physical downlink control channel (PDCCH) monitoring occasion within the slot when the UE is determined to be configured to monitor for the DL grant in the DCI format 1_2 message; and

determine that the at least one TDRA candidate has more than one possible location within the slot when the starting symbol for determining the at least one location of the at least one TDRA within the slot is configured based on the at least one PDCCH monitoring occasion within the slot.

38. The apparatus of claim 37 , wherein the UE is configured to monitor for the DL grant through a radio resource control (RRC) parameter.

39. The apparatus of claim 37 , wherein to determine that the at least one TDRA candidate has more than one possible location within the slot the at least one processor is further configured to determine that there is a plurality of PDCCH monitoring occasions within the slot in which a DCI format 1_2 message is configured to be transmitted.

40. The apparatus of claim 37 , wherein to determine that the at least one TDRA candidate has more than one possible location within the slot the at least one processor is further configured to determine that a K 0 slot offset associated with each of the at least one TDRA candidate is equal to 0.

41. The apparatus of claim 34 , wherein to receive the HARQ-ACK feedback the at least one processor is further configured to:

determine a number of physical downlink control channel (PDCCH) monitoring occasions within the slot;

determine, based on the number of PDCCH monitoring occasions, the first number of TDRA candidates of the at least one TDRA candidate that has more than one possible location within the slot; and

determine a total number of TDRA candidates within the slot, the total number of TDRA candidates within the slot including the first number of TDRA candidates within the slot, the second number of TDRA candidates corresponding to the additional location of the at least one TDRA candidate within the slot, and a third number of TDRA candidates with one possible location within the slot,

wherein the HARQ-ACK feedback is received based on the total number of TDRA candidates.

42. The apparatus of claim 41 , wherein the at least one processor is further configured to determine a total number of non-overlapping TDRA candidates within the slot based on the total number of TDRA candidates, wherein the HARQ-ACK feedback is received via x bits, where x is equal to the total number of non-overlapping TDRA candidates.

43. The apparatus of claim 41 , wherein the at least one processor is further configured to determine the second number of TDRA candidates corresponding to the additional location of the at least one TDRA candidate that are fully contained within the slot.

44. The apparatus of claim 34 , wherein a number of physical downlink control channel (PDCCH) monitoring occasions within the slot includes a first PDCCH monitoring occasion at a first starting symbol S 0 >0, the additional location of the at least one TDRA candidate within the slot each corresponding to a second starting symbol equal to S 0 plus a starting symbol S of the at least one TDRA candidate.