Feedback mode indication for coordinated transmission
Certain aspects of the present disclosure provide techniques for wireless communication. The techniques include a method wireless communication by a user equipment including receiving a first physical downlink control channel (PDCCH) from a first transmission reception point (TRP) and a second PDCCH from a second TRP, wherein the first PDCCH and the second PDCCH include the same downlink control information (DCI), selecting a physical uplink control channel (PUCCH) resource for transmitting hybrid automatic repeated request acknowledgment (HARQ-ACK) feedback based on one of the first PDCCH or the second PDCCH, and transmitting a PUCCH that includes the HARQ-ACK feedback using the selected PUCCH resource.
1. A method for wireless communication by a user equipment (UE), comprising:
receiving a first physical downlink control channel (PDCCH) from a first transmission reception point (TRP) and a second PDCCH from a second TRP, wherein downlink control information (DCI) included in each of the first PDCCH and the second PDCCH is the same;
selecting a physical uplink control channel (PUCCH) resource for transmitting hybrid automatic repeated request acknowledgment (HARQ-ACK) feedback based, in part, on a PDCCH, comprising one of the first PDCCH or the second PDCCH, detected in a last PDCCH monitoring occasion of a plurality of PDCCH monitoring occasions; and
transmitting a PUCCH that includes the HARQ-ACK feedback using the selected PUCCH resource.
2. The method of claim 1 , wherein selecting the PUCCH resource is further based on an index of a starting control channel element (CCE) associated with the PDCCH detected in the last PDCCH monitoring occasion.
3. The method of claim 1 , wherein selecting the PUCCH resource is further based on a search space identifier associated with the first PDCCH or the second PDCCH.
4. The method of claim 1 , wherein the first PDCCH from the first TRP and the second PDCCH from the second TRP comprise a PDCCH repetition.
5. The method of claim 1 , further comprising generating the HARQ-ACK feedback, wherein the HARQ-ACK feedback is associated with both the first PDCCH received from the first TRP and the second PDCCH received from the second TRP.
6. The method of claim 1 , further comprising determining that a first PUCCH transmission for the first TRP and a second PUCCH transmission for the second TRP are scheduled on the selected PUCCH resource.
7. The method of claim 6 , further comprising:
generating first HARQ-ACK feedback for the first PUCCH transmission for the first TRP from a first HARQ-ACK codebook; and
generating second HARQ-ACK feedback for the second PUCCH transmission for the second TRP from a second HARQ-ACK codebook.
8. The method of claim 7 , wherein the first HARQ-ACK codebook is a semi-static codebook of a first size and the second HARQ-ACK codebook is a semi-static codebook of a second size that is different from the first size.
9. The method of claim 7 , further comprising multiplexing a first number of bits of the first HARQ-ACK feedback with a second number of bits of the second HARQ-ACK feedback to obtain multiplexed HARQ-ACK feedback, wherein transmitting the HARQ-ACK feedback comprises transmitting the multiplexed HARQ-ACK feedback, in the PUCCH resource, to at least one of the first TRP or the second TRP.
10. A user equipment (UE), comprising:
one or more processors configured to execute instructions stored on one or more memories and to cause the UE to:
receive a first physical downlink control channel (PDCCH) from a first transmission reception point (TRP) and a second PDCCH from a second TRP, wherein downlink control information (DCI) included in each of the first PDCCH and the second PDCCH is the same;
select a physical uplink control channel (PUCCH) resource for transmitting hybrid automatic repeated request acknowledgment (HARQ-ACK) feedback based, in part, on a PDCCH, comprising one of the first PDCCH or the second PDCCH, detected in a last PDCCH monitoring occasion of a plurality of PDCCH monitoring occasions; and
transmit a PUCCH that includes the HARQ-ACK feedback using the selected PUCCH resource.
11. The UE of claim 10 , wherein the one or more processors are configured to cause the UE to select the PUCCH resource further based on an index of a starting control channel element (CCE) associated with the PDCCH detected in the last PDCCH monitoring occasion.
12. The UE of claim 10 , wherein the one or more processors are configured to cause the UE to select the PUCCH resource based, in part, on a search space identifier associated with the first PDCCH or the second PDCCH.
13. The UE of claim 10 , wherein the first PDCCH from the first TRP and the second PDCCH from the second TRP comprise a PDCCH repetition.
14. The UE of claim 10 , wherein the one or more processors are further configured to cause the UE to generate the HARQ-ACK feedback, wherein the HARQ-ACK feedback is associated with both the first PDCCH received from the first TRP and the second PDCCH received from the second TRP.
15. The UE of claim 10 , wherein the one or more processors are further configured to cause the UE to determine that a first PUCCH transmission for the first TRP and a second PUCCH transmission for the second TRP are scheduled on the selected PUCCH resource.
16. The UE of claim 15 , wherein the one or more processors are further configured to cause the UE to:
generate first HARQ-ACK feedback for the first PUCCH transmission for the first TRP from a first HARQ-ACK codebook; and
generate second HARQ-ACK feedback for the second PUCCH transmission for the second TRP from a second HARQ-ACK codebook.
17. The UE of claim 16 , wherein the first HARQ-ACK codebook is a semi-static codebook of a first size and the second HARQ-ACK codebook is a semi-static codebook of a second size that is different from the first size.
18. The UE of claim 16 , wherein:
the one or more processors are further configured to cause the UE to multiplex a first number of bits of the first HARQ-ACK feedback with a second number of bits of the second HARQ-ACK feedback to obtain multiplexed HARQ-ACK feedback; and
in order to transmit the HARQ-ACK feedback, the one or more processors are configured to cause the UE to transmit the multiplexed HARQ-ACK feedback, in the PUCCH resource, to at least one of the first TRP or the second TRP.
19. A method for wireless communication by a network entity, comprising:
sending, to a user equipment (UE), a first physical downlink control channel (PDCCH) from a first transmission reception point (TRP) and a second PDCCH from a second TRP, wherein downlink control information (DCI) included in each of the first PDCCH and the second PDCCH is the same; and
receiving, in a physical uplink control channel (PUCCH) resource, a PUCCH that includes hybrid automatic repeated request acknowledgment (HARQ-ACK) feedback, wherein the PUCCH resource is based, in part, on a PDCCH, comprising one of the first PDCCH or the second PDCCH, transmitted in a last PDCCH monitoring occasion of a plurality of PDCCH monitoring occasions.
20. The method of claim 19 , wherein:
the PUCCH resource is further based on an index of a starting control channel element (CCE) associated with the PDCCH transmitted in the last PDCCH monitoring occasion.
21. The method of claim 19 , wherein the PUCCH resource is further based on a search space identifier associated with the first PDCCH or the second PDCCH.
22. The method of claim 19 , wherein the first PDCCH from the first TRP and the second PDCCH from the second TRP comprise a PDCCH repetition.
23. The method of claim 19 , wherein the HARQ-ACK feedback is associated with both the first PDCCH from the first TRP and the second PDCCH from the second TRP.
24. A network entity, comprising:
one or more processors configured to execute instructions stored on one or more memories and to cause the network entity to:
send, to a user equipment (UE), a first physical downlink control channel (PDCCH) from a first transmission reception point (TRP) and a second PDCCH from a second TRP, wherein downlink control information (DCI) included in each of the first PDCCH and the second PDCCH is the same; and
receive, in a physical uplink control channel (PUCCH) resource, a PUCCH that includes hybrid automatic repeated request acknowledgment (HARQ-ACK) feedback, wherein the PUCCH resource is based, in part, on a PDCCH, comprising one of the first PDCCH or the second PDCCH, transmitted in a last PDCCH monitoring occasion of a plurality of PDCCH monitoring occasions.
25. The network entity of claim 24 , wherein:
the PUCCH resource is further based on an index of a starting control channel element (CCE) associated with the PDCCH transmitted in the last PDCCH monitoring occasion.
26. The network entity of claim 24 , wherein the PUCCH resource is further based on a search space identifier associated with the first PDCCH or the second PDCCH.
27. The network entity of claim 24 , wherein the first PDCCH from the first TRP and the second PDCCH from the second TRP comprise a PDCCH repetition.
28. The network entity of claim 24 , wherein the HARQ-ACK feedback is associated with both the first PDCCH from the first TRP and the second PDCCH from the second TRP.