HARQ feedback reporting for cross-carrier scheduling

1. A method of wireless communication performed by a base station (BS), comprising:

transmitting a plurality of physical downlink control channel (PDCCH) communications in a same PDCCH monitoring occasion in a first cell; and

transmitting a plurality of physical downlink shared channel (PDSCH) communications in at least one of the first cell or a second cell,

wherein each of the plurality of PDCCH communications schedules a respective PDSCH communication of the plurality of PDSCH communications, and

wherein a PDCCH communication, of the plurality of PDCCH communications, includes an indication of a counter downlink assignment index (DAI) that is based at least in part on:

a combination of a starting symbol and a cell in which an associated PDSCH communication, of the plurality of PDSCH communications, is to be transmitted,

a cell index of the cell in which the associated PDSCH communication is to be transmitted, and

the PDCCH monitoring occasion.

2. The method of claim 1 , wherein the first cell and the second cell are configured with different subcarrier spacings.

3. The method of claim 1 , wherein the first cell is a scheduling cell and the second cell is a PDSCH serving cell.

4. The method of claim 1 , wherein the PDCCH communication includes an indication of a total DAI that is based at least in part on a quantity of the plurality of PDCCH communications.

5. The method of claim 1 , wherein each of the plurality of PDCCH communications includes a physical uplink control channel resource indicator (PRI) that identifies a slot in which hybrid automatic repeat request feedback is to be transmitted for the plurality of PDCCH communications and the plurality of PDSCH communications.

6. The method of claim 1 , wherein the PDCCH communication includes a first physical uplink control channel (PUCCH) resource indicator (PRI);

wherein another PDCCH communication of the plurality of PDCCH communications includes a second PM that is different from the first PM; and

wherein the method further comprises:

determining that the counter DAI, indicated in the PDCCH communication, is a highest counter DAI value among the plurality of PDCCH communications;

determining, based at least in part on the counter DAI being the highest counter DAI value among the plurality of PDCCH communications, a slot in which hybrid automatic repeat request (HARQ) feedback is to be transmitted for the plurality of PDCCH communications and the plurality of PDSCH communications indicated by the first PRI; and

receiving, in the slot, a PUCCH communication that includes the HARQ feedback.

7. The method of claim 1 , wherein the counter DAI is based at least in part on:

for PDSCH communications on a same cell and scheduled in a same PDCCH monitoring occasion, a starting symbol index to order the counter DAI and downlink control information (DCI) first,

for PDSCH communications on a different cell and scheduled in a same PDCCH monitoring occasion, a cell index to order counter DAI and the DCI second, and

for PDSCH communications on a different cell and scheduled in a different PDCCH monitoring occasion, a monitoring occasion index third.

8. A method of wireless communication performed by a user equipment (UE), comprising:

receiving a plurality of physical downlink control channel (PDCCH) communications in a same PDCCH monitoring occasion in a first cell; and

receiving a plurality of physical downlink shared channel (PDSCH) communications in at least one of the first cell or a second cell,

wherein each of the plurality of PDCCH communications schedules a respective PDSCH communication of the plurality of PDSCH communications, and

wherein a PDCCH communication, of the plurality of PDCCH communications, includes an indication of a counter downlink assignment index (DAI) that is based at least in part on:

a combination of a starting symbol and a cell in which an associated PDSCH communication, of the plurality of PDSCH communications, is to be transmitted,

a cell index of the cell in which the associated PDSCH communication is to be transmitted, and

the PDCCH monitoring occasion.

9. The method of claim 8 , wherein the first cell and the second cell are configured with different subcarrier spacings.

10. The method of claim 8 , wherein the first cell is a scheduling cell and the second cell is a PDSCH serving cell.

11. The method of claim 8 , wherein the PDCCH communication includes an indication of a total DAI that is based at least in part on a quantity of the plurality of PDCCH communications.

12. The method of claim 8 , wherein each of the plurality of PDCCH communications includes a physical uplink control channel resource indicator (PRI) that identifies a slot in which hybrid automatic repeat request feedback is to be transmitted for the plurality of PDCCH communications and the plurality of PDSCH communications.

13. The method of claim 8 , wherein the PDCCH communication includes a first physical uplink control channel resource indicator (PRI);

wherein another PDCCH communication of the plurality of PDCCH communications includes a second PM that is different from the first PM; and

wherein the method further comprises:

determining that the counter DAI, indicated in the PDCCH communication, is a highest counter DAI value among the plurality of PDCCH communications;

determining, based at least in part on the counter DAI being the highest counter DAI value among the plurality of PDCCH communications, a slot in which hybrid automatic repeat request (HARQ) feedback is to be transmitted for the plurality of PDCCH communications and the plurality of PDSCH communications indicated by the first PM; and

transmitting, in the slot, a PUCCH communication that includes the HARQ feedback.

14. The method of claim 8 , wherein the counter DAI is based at least in part on:

for PDSCH communications on a same cell and scheduled in a same PDCCH monitoring occasion, a starting symbol index to order the counter DAI and downlink control information (DCI) first,

for PDSCH communications on a different cell and scheduled in a same PDCCH monitoring occasion, a cell index to order counter DAI and the DCI second, and

for PDSCH communications on a different cell and scheduled in a different PDCCH monitoring occasion, a monitoring occasion index third.

15. A user equipment (UE) for wireless communication, comprising:

a memory; and

one or more processors, coupled to the memory, configured to:

receive a plurality of physical downlink control channel (PDCCH) communications in a same PDCCH monitoring occasion in a first cell; and

receive a plurality of physical downlink shared channel (PDSCH) communications in at least one of the first cell or a second cell,

wherein each of the plurality of PDCCH communications schedules a respective PDSCH communication of the plurality of PDSCH communications, and

wherein a PDCCH communication, of the plurality of PDCCH communications, includes an indication of a counter downlink assignment index (DAI) that is based at least in part on:

a combination of a starting symbol and a cell in which an associated PDSCH communication, of the plurality of PDSCH communications, is to be transmitted,

a cell index of the cell in which the associated PDSCH communication is to be transmitted, and the PDCCH monitoring occasion.

16. The UE of claim 15 , wherein the first cell and the second cell are configured with different subcarrier spacings.

17. The UE of claim 15 , wherein the first cell is a scheduling cell and the second cell is a PDSCH serving cell.

18. The UE of claim 15 , wherein the PDCCH communication includes an indication of a total DAI that is based at least in part on a quantity of the plurality of PDCCH communications.

19. The UE of claim 15 , wherein each of the plurality of PDCCH communications includes a physical uplink control channel resource indicator (PRI) that identifies a slot in which hybrid automatic repeat request feedback is to be transmitted for the plurality of PDCCH communications and the plurality of PDSCH communications.

20. The UE of claim 15 , wherein the PDCCH communication includes a first physical uplink control channel resource indicator (PM); and

wherein another PDCCH communication of the plurality of PDCCH communications includes a second PM that is different from the first PM.

21. The UE of claim 20 , wherein the one or more processors are further configured to:

determine that the counter DAI, indicated in the PDCCH communication, is a highest counter DAI value among the plurality of PDCCH communications;

determine, based at least in part on the counter DAI being the highest counter DAI value among the plurality of PDCCH communications, a slot in which hybrid automatic repeat request (HARQ) feedback is to be transmitted for the plurality of PDCCH communications and the plurality of PDSCH communications indicated by the first PM; and

transmit, in the slot, a PUCCH communication that includes the HARQ feedback.

22. The UE of claim 15 , wherein the counter DAI is based at least in part on:

for PDSCH communications on a same cell and scheduled in a same PDCCH monitoring occasion, a starting symbol index to order the counter DAI and downlink control information (DCI) first.

23. The UE of claim 22 , wherein the counter DAI is further based at least in part on:

for PDSCH communications on a different cell and scheduled in a same PDCCH monitoring occasion, a cell index to order counter DAI and the DCI second.

24. The UE of claim 23 , wherein the counter DAI is further based at least in part on:

for PDSCH communications on a different cell and scheduled in a different PDCCH monitoring occasion, a monitoring occasion index third.