Processing time for joint channel estimation
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive demodulation reference signals (DMRSs) in multiple physical downlink shared channel (PDSCH) reception occasions. The UE may perform joint channel estimation using the DMRSs in the multiple PDSCH reception occasions. The UE may transmit a feedback message after a processing time that includes an offset associated with the joint channel estimation, wherein the processing time starts after a last symbol of a PDSCH reception occasion of the multiple PDSCH reception occasions and ends before a first symbol of the feedback message. Numerous other aspects are described.
1. A user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
receive demodulation reference signals (DMRSs) in multiple physical downlink shared channel (PDSCH) reception occasions;
perform joint channel estimation using the DMRSs in the multiple PDSCH reception occasions; and
transmit a feedback message after a PDSCH processing time including an offset that is associated with the joint channel estimation and that extends the PDSCH processing time associated with the joint channel estimation, wherein the PDSCH processing time starts after a last symbol of a PDSCH reception occasion of the multiple PDSCH reception occasions and ends before a first symbol of the feedback message.
2. The UE of claim 1 , wherein each PDSCH reception occasion of the multiple PDSCH reception occasions has a duration of a slot.
3. The UE of claim 1 , wherein each PDSCH reception occasion of the multiple PDSCH reception occasions has a duration of a sub-slot or a mini-slot.
4. The UE of claim 1 , wherein the offset extends a quantity of symbols for decoding that are associated with a DMRS position within a PDSCH reception occasion of the multiple PDSCH reception occasions.
5. The UE of claim 1 , wherein the offset is based at least in part on a subcarrier spacing.
6. The UE of claim 1 , wherein the offset is based at least in part on a PDSCH type.
7. The UE of claim 1 , wherein the offset is based at least in part on a capability of the UE.
8. The UE of claim 1 , wherein PDSCHs in the multiple PDSCH reception occasions are repetitions of the same PDSCH.
9. The UE of claim 1 , wherein PDSCHs in the multiple PDSCH reception occasions are different PDSCHs, each scheduled by different downlink control information.
10. The UE of claim 9 , wherein the offset is based at least in part on an order of the PDSCH reception occasions with respect to other PDSCH reception occasions of the multiple PDSCH reception occasions.
11. The UE of claim 1 , wherein the offset is based at least in part on whether joint channel estimation is enabled for multiple physical downlink control channel (PDCCH) reception occasions in addition to the joint channel estimation for the DMRSs in the multiple PDSCH reception occasions.
12. The UE of claim 1 , wherein the offset is received from a network entity.
13. The UE of claim 1 , wherein the offset is obtained from stored configuration information.
14. A network entity for wireless communication, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
transmit, for a user equipment (UE), demodulation reference signals (DMRSs) in multiple physical downlink shared channel (PDSCH) reception occasions; and
receive a feedback message based at least in part on a PDSCH processing time at the UE, wherein the PDSCH processing time includes an offset that is associated with joint channel estimation of the DMRSs and that extends the PDSCH processing time associated with the joint channel estimation, and wherein the PDSCH processing time starts after a last symbol of a PDSCH reception occasion of the multiple PDSCH reception occasions and ends before a first symbol of the feedback message.
15. The network entity of claim 14 , wherein the one or more processors are further configured to transmit, to the UE, a configuration for the joint channel estimation.
16. The network entity of claim 15 , wherein the one or more processors are further configured to transmit, to the UE, an indication of whether joint channel estimation is enabled for the DMRSs in the multiple PDSCH reception occasions.
17. The network entity of claim 14 , wherein the one or more processors are further configured to transmit the offset to the UE.
18. The network entity of claim 14 , wherein the offset extends a quantity of symbols for decoding that are associated with a DMRS position within a slot.
19. The network entity of claim 14 , wherein the offset is based at least in part on a subcarrier spacing.
20. The network entity of claim 14 , wherein the offset is based at least in part on a PDSCH type.
21. The network entity of claim 14 , wherein the offset is based at least in part on a capability of the UE.
22. The network entity of claim 14 , wherein PDSCHs in the multiple PDSCH reception occasions are repetitions of the same PDSCH.
23. The network entity of claim 14 , wherein PDSCHs in the multiple PDSCH reception occasions are different PDSCHs, each scheduled by different downlink control information.
24. The network entity of claim 23 , wherein the offset is based at least in part on an order of the PDSCH reception occasions with respect to other PDSCH reception occasions of the multiple PDSCH reception occasions.
25. The network entity of claim 14 , wherein the offset is based at least in part on whether joint channel estimation is enabled for multiple physical downlink control channel (PDCCH) reception occasions in addition to the joint channel estimation for the DMRSs in the multiple PDSCH reception occasions.
26. A method of wireless communication performed by a user equipment (UE), comprising:
receiving demodulation reference signals (DMRSs) in multiple physical downlink shared channel (PDSCH) reception occasions;
performing joint channel estimation using the DMRSs in the multiple PDSCH reception occasions; and
transmitting a feedback message after a PDSCH processing time including an offset that is associated with the joint channel estimation and that extends the PDSCH processing time associated with the joint channel estimation, wherein the PDSCH processing time starts after a last symbol of a PDSCH reception occasion of the multiple PDSCH reception occasions and ends before a first symbol of the feedback message.
27. The method of claim 26 , wherein the offset extends a quantity of symbols for decoding that are associated with a DMRS position within a PDSCH reception occasion of the multiple PDSCH reception occasions.
28. The method of claim 26 , wherein the offset is based at least in part on one or more of a subcarrier spacing, a PDSCH type, or a capability of the UE.
29. A method of wireless communication performed by a network entity, comprising:
transmitting, for a user equipment (UE), demodulation reference signals (DMRSs) in multiple physical downlink shared channel (PDSCH) reception occasions; and
receiving a feedback message based at least in part on a PDSCH processing time at the UE, wherein the PDSCH processing time includes an offset that is associated with joint channel estimation of the DMRSs and that extends the PDSCH processing time associated with the joint channel estimation, and wherein the PDSCH processing time starts after a last symbol of a PDSCH reception occasion of the multiple PDSCH reception occasions and ends before a first symbol of the feedback message.
30. The method of claim 29 , wherein the offset extends a quantity of symbols for decoding that are associated with a DMRS position within a slot.