Dynamic hybrid automatic repeat request (HARQ) codebook for multi-transmit receive point (TRP) communication
This disclosure provides systems, methods and apparatus for wireless communication. In one aspect, a multi-transmit-receive point (TRP) approach for hybrid automatic repeat request (HARQ) acknowledgment (ACK) feedback using counter downlink assignment indicators (DAIs) (cDAIs) and total DAIs (tDAIs) is provided. For example, some techniques and apparatuses described herein may provide a joint counting method in which cDAIs and tDAIs are implemented and tracked jointly between the TRPs of a multi-TRP group. This may be useful in the ideal backhaul scenario when the multi-TRP group is jointly scheduled, and may be more robust against errors than a separate counting method. Some techniques and apparatuses described herein may provide a separate counting method, in which cDAIs and tDAIs are implemented and tracked separately by the respective TRPs of a multi-TRP group.
1. A method of wireless communication performed by a user equipment (UE), comprising:
receiving information indicating whether hybrid automatic repeat request acknowledge (HARQ-ACK) feedback uses a joint HARQ-ACK payload or separate HARQ-ACK payloads for a first transmit-receive point (TRP) and a second TRP;
receiving a downlink control information (DCI) transmission associated with the first TRP and a serving cell; and
providing the HARQ-ACK feedback based at least in part on:
whether the joint HARQ-ACK payload is used or the separate HARQ-ACK payloads are used, and
the DCI transmission.
2. The method of claim 1 , wherein the DCI is associated with a physical downlink control channel (PDCCH) used to schedule physical downlink shared channel (PDSCH) communications, and
wherein the HARQ-ACK feedback indicates which PDSCH communications are unsuccessfully received.
3. The method of claim 1 , wherein the HARQ-ACK feedback is provided using the joint HARQ-ACK payload, and
wherein the joint HARQ-ACK payload is relevant to the first TRP and the second TRP.
4. The method of claim 1 , wherein the HARQ-ACK feedback is provided using the joint HARQ-ACK payload, and
wherein the joint HARQ-ACK payload includes a joint codebook corresponding to DCIs received from the first TRP and the second TRP.
5. The method of claim 1 , wherein the HARQ-ACK feedback is transmitted using the joint HARQ-ACK payload, and
wherein counter downlink assignment indicators (cDAIs) and total downlink assignment indicators (tDAIs) are tracked jointly between the first TRP and the second TRP.
6. The method of claim 1 , wherein the HARQ-ACK feedback is provided using the separate HARQ-ACK payloads, and
wherein a respective separate HARQ-ACK payload provides HARQ-ACK feedback for a respective TRP of the first TRP and the second TRP.
7. The method of claim 1 , wherein the HARQ-ACK feedback is provided using the separate HARQ-ACK payloads, and
wherein the separate HARQ-ACK payloads include separate codebooks corresponding to DCIs received from the first TRP and the second TRP.
8. The method of claim 1 , wherein the HARQ-ACK feedback is provided using the separate HARQ-ACK payloads, and
wherein counter downlink assignment indicators (cDAIs) and total downlink assignment indicators (tDAIs) are tracked separately by the first TRP and the second TRP.
9. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:
receive information indicating whether hybrid automatic repeat request acknowledge (HARQ-ACK) feedback uses a joint HARQ-ACK payload or separate HARQ-ACK payloads for a first transmit-receive point (TRP) and a second TRP;
receive a downlink control information (DCI) transmission associated with the first TRP and a serving cell; and
provide the HARQ-ACK feedback based at least in part on:
whether the joint HARQ-ACK payload is used or the separate HARQ-ACK payloads are used, and
the DCI transmission.
10. The UE of claim 9 , wherein the DCI is associated with a physical downlink control channel (PDCCH) used to schedule physical downlink shared channel (PDSCH) communications, and
wherein the HARQ-ACK feedback indicates which PDSCH communications are unsuccessfully received.
11. The UE of claim 9 , wherein the HARQ-ACK feedback is provided using the joint HARQ-ACK payload, and
wherein the joint HARQ-ACK payload is relevant to the first TRP and the second TRP.
12. The UE of claim 9 , wherein the HARQ-ACK feedback is provided using the joint HARQ-ACK payload, and
wherein the joint HARQ-ACK payload includes a joint codebook corresponding to DCIs received from the first TRP and the second TRP.
13. The UE of claim 9 , wherein the HARQ-ACK feedback is transmitted using the joint HARQ-ACK payload, and
wherein counter downlink assignment indicators (cDAIs) and total downlink assignment indicators (tDAIs) are tracked jointly between the first TRP and the second TRP.
14. The UE of claim 9 , wherein the HARQ-ACK feedback is provided using the separate HARQ-ACK payloads, and
wherein a respective separate HARQ-ACK payload provides HARQ-ACK feedback for a respective TRP of the first TRP and the second TRP.
15. The UE of claim 9 , wherein the HARQ-ACK feedback is provided using the separate HARQ-ACK payloads, and
wherein the separate HARQ-ACK payloads include separate codebooks corresponding to DCIs received from the first TRP and the second TRP.
16. The UE of claim 9 , wherein the HARQ-ACK feedback is provided using the separate HARQ-ACK payloads, and
wherein counter downlink assignment indicators (cDAIs) and total downlink assignment indicators (tDAIs) are tracked separately by the first TRP and the second TRP.
17. 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 information indicating whether hybrid automatic repeat request acknowledge (HARQ-ACK) feedback uses a joint HARQ-ACK payload or separate HARQ-ACK payloads for a first transmit-receive point (TRP) and a second TRP;
receive a downlink control information (DCI) transmission associated with the first TRP and a serving cell; and
provide the HARQ-ACK feedback based at least in part on:
whether the joint HARQ-ACK payload is used or the separate HARQ-ACK payloads are used, and
the DCI transmission.
18. The non-transitory computer-readable medium of claim 17 , wherein the DCI is associated with a physical downlink control channel (PDCCH) used to schedule physical downlink shared channel (PDSCH) communications, and
wherein the HARQ-ACK feedback indicates which PDSCH communications are unsuccessfully received.
19. The non-transitory computer-readable medium of claim 17 , wherein the HARQ-ACK feedback is provided using the joint HARQ-ACK payload, and
wherein the joint HARQ-ACK payload is relevant to the first TRP and the second TRP.
20. The non-transitory computer-readable medium of claim 17 , wherein the HARQ-ACK feedback is provided using the joint HARQ-ACK payload, and
wherein the joint HARQ-ACK payload includes a joint codebook corresponding to DCIs received from the first TRP and the second TRP.
21. The non-transitory computer-readable medium of claim 17 , wherein the HARQ-ACK feedback is transmitted using the joint HARQ-ACK payload, and
wherein counter downlink assignment indicators (cDAIs) and total downlink assignment indicators (tDAIs) are tracked jointly between the first TRP and the second TRP.
22. The non-transitory computer-readable medium of claim 17 , wherein the HARQ-ACK feedback is provided using the separate HARQ-ACK payloads, and
wherein a respective separate HARQ-ACK payload provides HARQ-ACK feedback for a respective TRP of the first TRP and the second TRP.
23. The non-transitory computer-readable medium of claim 17 , wherein the HARQ-ACK feedback is provided using the separate HARQ-ACK payloads, and
wherein the separate HARQ-ACK payloads include separate codebooks corresponding to DCIs received from the first TRP and the second TRP.
24. The non-transitory computer-readable medium of claim 17 , wherein the HARQ-ACK feedback is provided using the separate HARQ-ACK payloads, and
wherein counter downlink assignment indicators (cDAIs) and total downlink assignment indicators (tDAIs) are tracked separately by the first TRP and the second TRP.
25. An apparatus for wireless communication, comprising:
means for receiving information indicating whether hybrid automatic repeat request acknowledge (HARQ-ACK) feedback uses a joint HARQ-ACK payload or separate HARQ-ACK payloads for a first transmit-receive point (TRP) and a second TRP;
means for receiving a downlink control information (DCI) transmission associated with the first TRP and a serving cell; and
means for providing the HARQ-ACK feedback based at least in part on:
whether the joint HARQ-ACK payload is used or the separate HARQ-ACK payloads are used, and
the DCI transmission.
26. The apparatus of claim 25 , wherein the DCI is associated with a physical downlink control channel (PDCCH) used to schedule physical downlink shared channel (PDSCH) communications, and
wherein the HARQ-ACK feedback indicates which PDSCH communications are unsuccessfully received.
27. The apparatus of claim 25 , wherein the HARQ-ACK feedback is provided using the joint HARQ-ACK payload, and
wherein the joint HARQ-ACK payload is relevant to the first TRP and the second TRP.
28. The apparatus of claim 25 , wherein the HARQ-ACK feedback is provided using the joint HARQ-ACK payload, and
wherein the joint HARQ-ACK payload includes a joint codebook corresponding to DCIs received from the first TRP and the second TRP.
29. The apparatus of claim 25 , wherein the HARQ-ACK feedback is transmitted using the joint HARQ-ACK payload, and
wherein counter downlink assignment indicators (cDAIs) and total downlink assignment indicators (tDAIs) are tracked jointly between the first TRP and the second TRP.
30. The apparatus of claim 25 , wherein the HARQ-ACK feedback is provided using the separate HARQ-ACK payloads, and
wherein a respective separate HARQ-ACK payload provides HARQ-ACK feedback for a respective TRP of the first TRP and the second TRP.