Hybrid automatic repeat request acknowledgment for downlink control information without physical downlink shared channel scheduling
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a UE may determine that a DCI message requests Type 3 HARQ-ACK and does not schedule a PDSCH communication; and determine, based at least in part on a PDSCH to HARQ feedback timing indicator of the DCI message, a time to transmit the Type 3 HARQ-ACK. Numerous other aspects are provided.
1. A method of wireless communication performed by a user equipment (UE), comprising:
determining that a downlink control information (DCI) message requests bandwidth part switching and one-shot hybrid automatic repeat request (HARQ) feedback and does not schedule a physical downlink shared channel (PDSCH) communication; and
transmitting, based at least in part on the DCI message requesting the bandwidth part switching and a PDSCH to HARQ feedback timing indicator of the DCI message, the one-shot HARQ feedback.
2. The method of claim 1 , wherein a time to transmit the one-shot HARQ feedback is based at least in part on a slot or sub-slot during which the UE receives the DCI message and the PDSCH to HARQ feedback timing indicator of the DCI message.
3. The method of claim 1 , wherein a time to transmit the one-shot HARQ feedback is based at least in part on a reference time and the PDSCH to HARQ feedback timing indicator of the DCI message.
4. The method of claim 3 , wherein the PDSCH to HARQ feedback timing indicator of the DCI message indicates an amount of time.
5. The method of claim 4 , wherein the PDSCH to HARQ feedback timing indicator of the DCI message indicates the amount of time based at least in part on a number of slots or sub-slots.
6. The method of claim 3 , wherein the reference time is a slot or sub-slot indicated by a value of a time domain resource allocation field of the DCI message.
7. The method of claim 1 , further comprising:
determining, based at least in part on the PDSCH to HARQ feedback timing indicator of the DCI message, a time to transmit the one-shot HARQ feedback.
8. The method of claim 1 , wherein the one-shot HARQ feedback comprises HARQ acknowledgment (HARQ-ACK) feedback for one or more configured HARQ processes for one or more component carriers over which the UE communicates with a network.
9. The method of claim 1 , wherein determining that the DCI message requests one-shot HARQ feedback and does not schedule a PDSCH communication comprises:
determining that the DCI does not schedule a PDSCH communication based at least in part on a value of a frequency domain resource allocation field of the DCI.
10. The method of claim 9 , wherein the value of the frequency domain resource allocation field of the DCI is:
all zeros if resource allocation Type 0 is configured,
all ones if resource allocation Type 1 is configured, and
all ones or all zeros if both resource allocation Type 0 and resource allocation Type 1 are configured.
11. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to:
determine that a downlink control information (DCI) message requests bandwidth part switching and one-shot hybrid automatic repeat request (HARQ) feedback and does not schedule a physical downlink shared channel (PDSCH) communication; and
transmit, based at least in part on the DCI message requesting the bandwidth part switching and a PDSCH to HARQ feedback timing indicator of the DCI message, the one-shot HARQ feedback.
12. The UE of claim 11 , wherein a time to transmit the one-shot HARQ feedback is based at least in part on a slot or sub-slot during which the UE receives the DCI message and the PDSCH to HARQ feedback timing indicator of the DCI message.
13. The UE of claim 11 , wherein a time to transmit the one-shot HARQ feedback is based at least in part on a reference time and the PDSCH to HARQ feedback timing indicator of the DCI message.
14. The UE of claim 13 , wherein the PDSCH to HARQ feedback timing indicator of the DCI message indicates an amount of time.
15. The UE of claim 14 , wherein the PDSCH to HARQ feedback timing indicator of the DCI message indicates the amount of time based at least in part on a number of slots or sub-slots.
16. The UE of claim 13 , wherein the reference time is a slot or sub-slot indicated by a value of a time domain resource allocation field of the DCI message.
17. The UE of claim 11 , wherein the one or more processors are further configured to:
determine, based at least in part on the PDSCH to HARQ feedback timing indicator of the DCI message, a time to transmit the one-shot HARQ feedback.
18. The UE of claim 11 , wherein the one-shot HARQ feedback comprises HARQ acknowledgment (HARQ-ACK) feedback for one or more configured HARQ processes for one or more component carriers over which the UE communicates with a network.
19. The UE of claim 11 , wherein a determination that the DCI message requests one-shot HARQ feedback and does not schedule a PDSCH communication comprises:
a determination that the DCI does not schedule a PDSCH communication based at least in part on a value of a frequency domain resource allocation field of the DCI.
20. The UE of claim 19 , wherein the value of the frequency domain resource allocation field of the DCI is:
all zeros if resource allocation Type 0 is configured,
all ones if resource allocation Type 1 is configured, and
all ones or all zeros if both resource allocation Type 0 and resource allocation Type 1 are configured.
21. 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:
determine that a downlink control information (DCI) message requests bandwidth part switching and one-shot hybrid automatic repeat request (HARQ) feedback and does not schedule a physical downlink shared channel (PDSCH) communication; and
transmit, based at least in part on the DCI message requesting the bandwidth part switching and a PDSCH to HARQ feedback timing indicator of the DCI message, the one-shot HARQ feedback.
22. The non-transitory computer-readable medium of claim 21 , wherein a time to transmit the one-shot HARQ feedback is based at least in part on a slot or sub-slot during which the UE receives the DCI message and the PDSCH to HARQ feedback timing indicator of the DCI message.
23. The non-transitory computer-readable medium of claim 21 , wherein a time to transmit the one-shot HARQ feedback is based at least in part on a reference time and the PDSCH to HARQ feedback timing indicator of the DCI message.
24. The non-transitory computer-readable medium of claim 21 , wherein the one or more instructions further cause the UE to:
determine, based at least in part on the PDSCH to HARQ feedback timing indicator of the DCI message, a time to transmit the one-shot HARQ feedback.
25. The non-transitory computer-readable medium of claim 21 , wherein the one-shot HARQ feedback comprises HARQ acknowledgment (HARQ-ACK) feedback for one or more configured HARQ processes for one or more component carriers over which the UE communicates with a network.
26. An apparatus for wireless communication, comprising:
means for determining that a downlink control information (DCI) message requests bandwidth part switching and one-shot hybrid automatic repeat request (HARQ) feedback and does not schedule a physical downlink shared channel (PDSCH) communication; and
means for transmitting, based at least in part on the DCI message requesting the bandwidth part switching and a PDSCH to HARQ feedback timing indicator of the DCI message, the one-shot HARQ feedback.
27. The apparatus of claim 26 , wherein a time to transmit the one-shot HARQ feedback is based at least in part on a slot or sub-slot during which the apparatus receives the DCI message and the PDSCH to HARQ feedback timing indicator of the DCI message.
28. The apparatus of claim 26 , wherein a time to transmit the one-shot HARQ feedback is based at least in part on a reference time and the PDSCH to HARQ feedback timing indicator of the DCI message.
29. The apparatus of claim 26 , further comprising:
means for determining, based at least in part on the PDSCH to HARQ feedback timing indicator of the DCI message, a time to transmit the one-shot HARQ feedback.
30. The apparatus of claim 26 , wherein the one-shot HARQ feedback comprises HARQ acknowledgment (HARQ-ACK) feedback for one or more configured HARQ processes for one or more component carriers over which the apparatus communicates with a network.