HARQ feedback reporting for cross-carrier scheduling
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station may transmit a plurality of physical downlink control channel (PDCCH) communications in a same PDCCH monitoring occasion in a first cell, and may transmit a plurality of physical downlink shared channel (PDSCH) communications in at least one of the first cell or a second cell. Each of the PDCCH communications schedules a respective PDSCH communication of the plurality of PDSCH communications. A PDCCH communication, of the plurality of PDCCH communications, includes an indication of a counter downlink assignment index that is based at least in part on a combination of a starting symbol and a cell in which an associated PDSCH communication 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. Numerous other aspects are provided.
1. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
receive, in a same physical downlink control channel (PDCCH) monitoring occasion and in a same cell:
a first PDCCH communication that schedules a downlink semi-persistent scheduling (SPS) release, and
one or more second PDCCH communications that each schedule respective physical downlink shared channel (PDSCH) communications; determine that an error has occurred based at least in part on at least one of:
the UE being scheduled to transmit hybrid automatic repeat request (HARQ) feedback for the downlink SPS release and HARQ feedback for the respective PDSCH communications in a same slot, or
the first PDCCH communication and the one or more second PDCCH communications being received in the same PDCCH monitoring occasion, and
transmit, based at least in part on determining that the error has occurred, the HARQ feedback for the downlink SPS release in a first slot,
wherein a starting symbol for the HARQ feedback for the downlink SPS release is a particular symbol after a first symbol in the first slot and is based at least in part on an indication provided in a downlink SPS activation associated with the downlink SPS release.
2. The UE of claim 1 , wherein the one or more processors are further configured to:
refrain from transmitting the HARQ feedback for the downlink SPS release and the HARQ feedback for the respective PDSCH communications in the same slot based at least in part on determining that the error has occurred.
3. The UE of claim 1 , wherein the one or more processors are further configured to:
transmit, based at least in part on determining that the error has occurred, the HARQ feedback for the respective PDSCH communications in a second slot.
4. The UE of claim 3 , wherein the first slot occurs before the second slot.
5. The UE of claim 3 , wherein the second slot occurs before the first slot.
6. The UE of claim 3 , wherein the UE is scheduled to transmit the HARQ feedback for the respective PDSCH communications is transmitted by a network node.
7. The UE of claim 3 , wherein the HARQ feedback for the respective PDSCH communications is transmitted based at least in part on a configuration stored by the UE.
8. The UE of claim 1 , wherein the one or more processors are further configured to:
determine the starting symbol for the HARQ feedback for the downlink SPS release based at least in part on the indication provided the downlink SPS activation.
9. The UE of claim 1 , wherein the one or more processors are further configured to:
receive the downlink SPS activation,
wherein the first PDCCH communication and the one or more second PDCCH communications are received based at least in part on receiving the downlink SPS activation.
10. A method of wireless communication performed by a user equipment (UE), comprising:
receiving, in a same physical downlink control channel (PDCCH) monitoring occasion and in a same cell:
a first PDCCH communication that schedules a downlink semi-persistent scheduling (SPS) release, and
one or more second PDCCH communications that each schedule respective physical downlink shared channel (PDSCH) communications; and
determining that an error has occurred based at least in part on at least one of:
the UE being scheduled to transmit hybrid automatic repeat request (HARQ) feedback for the downlink SPS release and HARQ feedback for the respective PDSCH communications in a same slot, or
the first PDCCH communication and the one or more second PDCCH communications being received in the same PDCCH monitoring occasion; and
transmit, based at least in part on determining that the error has occurred, the HARQ feedback for the downlink SPS release in a first slot, and the HARQ feedback for the respective PDSCH communications in a second slot,
wherein a starting symbol for the HARQ feedback for the downlink SPS release is a particular symbol after a first symbol in the first slot and is based at least in part on an indication provided in a downlink SPS activation associated with the downlink SPS release.
11. The method of claim 10 , further comprising:
refraining from transmitting the HARQ feedback for the downlink SPS release and the HARQ feedback for the respective PDSCH communications in the same slot based at least in part on determining that the error has occurred.
12. The method of claim 10 , further comprising:
transmitting, based at least in part on determining that the error has occurred, the HARQ feedback for the respective PDSCH communications in a second slot.
13. The method of claim 12 , wherein the first slot occurs before the second slot.
14. The method of claim 12 , wherein the second slot occurs before the first slot.
15. The method of claim 12 , wherein the UE is scheduled to transmit the HARQ feedback for the respective PDSCH communications is transmitted by a network node.
16. The method of claim 12 , wherein the HARQ feedback for the respective PDSCH communications is transmitted based at least in part on a configuration stored by the UE.
17. The method of claim 10 , further comprising:
determining the starting symbol for the HARQ feedback for the downlink SPS release based at least in part on the indication provided the downlink SPS activation.
18. The method of claim 10 , further comprising:
receiving the downlink SPS activation,
wherein the first PDCCH communication and the one or more second PDCCH communications are received based at least in part on receiving the downlink SPS activation.
19. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising:
one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to:
receive, in a same physical downlink control channel (PDCCH) monitoring occasion and in a same cell:
a first PDCCH communication that schedules a downlink semi-persistent scheduling (SPS) release, and
one or more second PDCCH communications that each schedule respective physical downlink shared channel (PDSCH) communications; determine that an error has occurred based at least in part on at least one of:
the UE being scheduled to transmit hybrid automatic repeat request (HARQ) feedback for the downlink SPS release and HARQ feedback for the respective PDSCH communications in a same slot, or
the first PDCCH communication and the one or more second PDCCH communications being received in the same PDCCH monitoring occasion, and
transmit, based at least in part on determining that the error has occurred, the HARQ feedback for the downlink SPS release in a first slot,
wherein a starting symbol for the HARQ feedback for the downlink SPS release is a particular symbol after a first symbol in the first slot and is based at least in part on an indication provided in a downlink SPS activation associated with the downlink SPS release.
20. The non-transitory computer-readable medium of claim 19 , wherein the one or more instructions further cause the UE to:
refrain from transmitting the HARQ feedback for the downlink SPS release and the HARQ feedback for the respective PDSCH communications in the same slot based at least in part on determining that the error has occurred.
21. The non-transitory computer-readable medium of claim 19 , wherein the one or more instructions further cause the UE to:
transmit, based at least in part on determining that the error has occurred, the HARQ feedback for the respective PDSCH communications in a second slot.
22. The non-transitory computer-readable medium of claim 21 , wherein the first slot occurs before the second slot.
23. The non-transitory computer-readable medium of claim 21 , wherein the second slot occurs before the first slot.
24. The non-transitory computer-readable medium of claim 21 , wherein the UE is scheduled to transmit the HARQ feedback for the respective PDSCH communications by a network node.
25. The non-transitory computer-readable medium of claim 21 , wherein the HARQ feedback for the respective PDSCH communications is transmitted based at least in part on a configuration stored by the UE.
26. An apparatus for wireless communication, comprising:
means for receiving, in a same physical downlink control channel (PDCCH) monitoring occasion and in a same cell:
a first PDCCH communication that schedules a downlink semi-persistent scheduling (SPS) release, and
one or more second PDCCH communications that each schedule respective physical downlink shared channel (PDSCH) communications;
means for determining that an error has occurred based at least in part on at least one of:
the apparatus being scheduled to transmit hybrid automatic repeat request (HARQ) feedback for the downlink SPS release and HARQ feedback for the respective PDSCH communications in a same slot, or
the first PDCCH communication and the one or more second PDCCH communications being received in the same PDCCH monitoring occasion; and
means for transmitting, based at least in part on determining that the error has occurred, the HARQ feedback for the downlink SPS release in a first slot,
wherein a starting symbol for the HARQ feedback for the downlink SPS release is a particular symbol after a first symbol in the first slot and is based at least in part on an indication provided in a downlink SPS activation associated with the downlink SPS release.
27. The apparatus of claim 26 , further comprising:
means for refraining from transmitting the HARQ feedback for the downlink SPS release and the HARQ feedback for the respective PDSCH communications in the same slot based at least in part on determining that the error has occurred.
28. The apparatus of claim 26 , wherein the downlink SPS activation is associated with scheduling one or more different PDSCH communications.
29. The apparatus of claim 26 , further comprising:
means for transmitting the HARQ feedback for the respective PDSCH communications in a second slot based at least in part on determining that the error has occurred.
30. The apparatus of claim 29 , wherein scheduled to transmit the HARQ feedback for the respective PDSCH communications is transmitted based at least in part on a configuration stored by the apparatus.