Ultra-reliable low latency communication with multiple transmission-reception points
The techniques described herein provide procedures at user equipment (UEs) for performing channel state information (CSI) reporting and sounding reference signal (SRS) transmissions based on an ultra-reliable low latency communication (URLLC) block error rate (BLER) target and for reliably receiving PDCCH transmissions. For CSI reporting, a UE may be configured to generate a CSI report based on a BLER target and on received CSI reference signals (CSI-RSs), where the CSI-RSs may be transmitted on one or more groups of quasi co-located antenna ports. For SRS transmissions, a UE may be configured to transmit SRS based on an SRS configuration determined based on a BLER target. For receiving PDCCH transmissions, a UE may be configured to receive and combine DCI received from multiple base stations.
1. An apparatus for wireless communication at a user equipment (UE), comprising:
a processor configured to cause the apparatus to:
monitor for downlink control information (DCI) in:
a first physical downlink control channel (PDCCH) candidate corresponding to a first demodulation reference signal (DMRS) port, and
a second PDCCH candidate corresponding to a second DMRS port; and
receive first DCI in the first PDCCH candidate and second DCI in the second PDCCH candidate based at least in part on the monitoring, wherein the first DCI and the second DCI include same information according to a mapping between the first PDCCH candidate and the second PDCCH candidate.
2. The apparatus of claim 1 , wherein the first DMRS port and the second DMRS port are in a same quasi co-location (QCL) group or are in different QCL groups.
3. The apparatus of claim 1 , wherein the mapping between the first PDCCH candidate and the second PDCCH candidate is based on the first PDCCH candidate having a same index as the second PDCCH candidate.
4. The apparatus of claim 1 , wherein the first PDCCH candidate has a same aggregation level as the second PDCCH candidate.
5. The apparatus of claim 1 , wherein the processor is further configured to cause the apparatus to:
communicate data that is rate-matched around the first PDCCH candidate and the second PDCCH candidate based on the mapping between the first PDCCH candidate and the second PDCCH candidate.
6. The apparatus of claim 1 , wherein the processor is further configured to cause the apparatus to:
receive control signaling configuring the first DMRS port and the second DMRS port.
7. The apparatus of claim 1 , wherein the DCI is monitored in one or more search spaces comprising a common search space, a UE-specific search space, or both.
8. The apparatus of claim 1 , wherein the same information for the first DCI and the second DCI comprises a downlink grant, and the processor is further configured to cause the apparatus to:
receive, from a network device, downlink data indicated by the downlink grant.
9. The apparatus of claim 1 , wherein the same information for the first DCI and the second DCI comprises an uplink grant, and the processor is further configured to cause the apparatus to:
transmit, to a network device, uplink data scheduled by the uplink grant.
10. The apparatus of claim 1 , wherein:
the first DMRS port corresponds to a first transmission/reception point (TRP) and the second DMRS port corresponds to a second TRP; and
the first TRP corresponds to a first network device and the second TRP corresponds to a second network device.
11. A method for wireless communication at a user equipment (UE), comprising:
monitoring for downlink control information (DCI) in:
a first physical downlink control channel (PDCCH) candidate corresponding to a first demodulation reference signal (DMRS) port, and
a second PDCCH candidate corresponding to a second DMRS port; and
receiving first DCI in the first PDCCH candidate and second DCI in the second PDCCH candidate based at least in part on the monitoring, wherein the first DCI and the second DCI comprise same information according to a mapping between the first PDCCH candidate and the second PDCCH candidate.
12. The method of claim 11 , wherein the first DMRS port and the second DMRS port are in a same quasi co-location (QCL) group or are in different QCL groups.
13. The method of claim 11 , wherein the mapping between the first PDCCH candidate and the second PDCCH candidate is based on the first PDCCH candidate having a same index as the second PDCCH candidate.
14. The method of claim 11 , wherein the first PDCCH candidate has a same aggregation level as the second PDCCH candidate.
15. The method of claim 11 , further comprising:
communicating data that is rate-matched around the first PDCCH candidate and the second PDCCH candidate based on the mapping between the first PDCCH candidate and the second PDCCH candidate.
16. An apparatus for wireless communication at a user equipment (UE), comprising:
means for monitoring for downlink control information (DCI) in:
a first physical downlink control channel (PDCCH) candidate corresponding to a first demodulation reference signal (DMRS) port, and
a second PDCCH candidate corresponding to a second DMRS port; and
means for receiving first DCI in the first PDCCH candidate and second DCI in the second PDCCH candidate based at least in part on the monitoring, wherein the first DCI and the second DCI comprise same information according to a mapping between the first PDCCH candidate and the second PDCCH candidate.
17. The apparatus of claim 16 , wherein the first DMRS port and the second DMRS port are in a same quasi co-location (QCL) group or are in different QCL groups.
18. The apparatus of claim 16 , wherein the mapping between the first PDCCH candidate and the second PDCCH candidate is based on the first PDCCH candidate having a same index as the second PDCCH candidate.
19. The apparatus of claim 16 , wherein the first PDCCH candidate has a same aggregation level as the second PDCCH candidate.
20. The apparatus of claim 16 , further comprising:
means for communicating data that is rate-matched around the first PDCCH candidate and the second PDCCH candidate based on the mapping between the first PDCCH candidate and the second PDCCH candidate.