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. A method for wireless communication at a user equipment (UE), comprising:
receiving a plurality of channel state information (CSI) reference signals (CSI-RSs) on corresponding CSI-RS resources associated with a CSI report, the plurality of CSI-RSs being associated with one or more sets of quasi co-located antenna ports;
identifying, from a plurality of block error rate (BLER) targets, at least one BLER target;
receiving a control message indicating a channel quality indicator (CQI) table associated with each of the plurality of BLER targets, wherein the control message includes a medium access control (MAC) control element (MAC-CE), a radio resource control (RRC) message, or a downlink control information (DCI) message;
generating the CSI report based at least in part on the at least one BLER target and the plurality of CSI-RSs; and
transmitting the generated CSI report.
2. The method of claim 1 , further comprising:
determining that a single set of quasi co-located antenna ports was used to transmit the plurality of CSI-RSs on the corresponding CSI-RS resources;
identifying that a same BLER target of the plurality of BLER targets is associated with the plurality of CSI-RSs received on the corresponding CSI-RS resources; and
generating the CSI report based at least in part on the same BLER target and the plurality of CSI-RSs.
3. The method of claim 1 , wherein identifying the at least one BLER target comprises:
receiving a CSI report configuration indicating the at least one BLER target.
4. The method of claim 1 , wherein the UE is configured to transmit CSI reports, including the generated CSI report, associated with a same BLER target.
5. The method of claim 1 , wherein the UE is configured to transmit CSI reports, including the generated CSI report, associated with different BLER targets.
6. A method for wireless communication at a user equipment (UE), comprising:
receiving a plurality of channel state information (CSI) reference signals (CSI-RSs) on corresponding CSI-RS resources associated with a CSI report, the plurality of CSI-RSs being associated with one or more sets of quasi co-located antenna ports;
determining that a first set of quasi co-located antenna ports was used to transmit a first set of the plurality of CSI-RSs and a second set of quasi co-located antenna ports was used to transmit a second set of the plurality of CSI-RSs;
identifying, from a plurality of block error rate (BLER) targets, that a single BLER target is associated with the plurality of CSI-RSs received on the corresponding CSI-RS resources; and
generating the CSI report based at least in part on the single BLER target and the first and second sets of the plurality of CSI-RSs; and
transmitting the generated CSI report.
7. The method of claim 6 , wherein generating the CSI report comprises:
including a channel quality indicator (CQI) in the CSI report for each of the first and second sets of the plurality of CSI-RSs based at least in part on the single BLER target.
8. The method of claim 6 , wherein generating the CSI report comprises:
including a channel quality indicator (CQI) in the CSI report for either the first set of the plurality of CSI-RSs or the second set of the plurality of CSI-RSs based at least in part on the single BLER target.
9. The method of claim 6 , wherein generating the CSI report comprises:
including a channel quality indicator (CQI) in the CSI report for each of the first and second sets of the plurality of CSI-RSs transmitted on a single CSI-RS resource of the corresponding CSI-RS resources based at least in part on the single BLER target.
10. A method for wireless communication at a user equipment (UE), comprising:
receiving a plurality of channel state information (CSI) reference signals (CSI-RSs) on corresponding CSI-RS resources associated with a CSI report, the plurality of CSI-RSs being associated with one or more sets of quasi co-located antenna ports;
determining that a first set of quasi co-located antenna ports was used to transmit a first set of the plurality of CSI-RSs and a second set of quasi co-located antenna ports was used to transmit a second set of the plurality of CSI-RSs;
identifying, from a plurality of block error rate (BLER) targets, multiple BLER targets associated with the plurality of CSI-RSs, each BLER target of the multiple BLER targets corresponding to a set of quasi co-located antenna ports used to transmit a set of the plurality of CSI-RSs; and
generating the CSI report based at least in part on the multiple BLER targets and the first and second sets of the plurality of CSI-RSs; and
transmitting the generated CSI report.
11. The method of claim 10 , wherein generating the CSI report comprises:
including a first channel quality indicator (CQI) in the CSI report for the first set of the plurality of CSI-RSs based at least in part on a first BLER target of the multiple BLER targets; and
including a second CQI in the CSI report for the second set of the plurality of CSI-RSs based at least in part on a second BLER target of the multiple BLER targets.
12. A method for wireless communication at a base station, comprising:
identifying a plurality of channel state information (CSI) reference signals (CSI-RSs) to transmit on corresponding CSI-RS resources;
transmitting a control message indicating at least one BLER target, of a plurality of BLER targets, wherein the indication of the at least one BLER target is included in a CSI report configuration;
transmitting the plurality of CSI-RSs on the corresponding CSI-RS resources on one or more sets of quasi co-located antenna ports; and
receiving a CSI report based at least in part on the at least one BLER target and the plurality of CSI-RSs.
13. The method of claim 12 , further comprising:
identifying a channel quality indicator (CQI) included in the CSI report associated with a BLER target of the at least one BLER target;
selecting a modulation and coding scheme (MCS) for transmitting data associated with the BLER target based at least in part on the CQI; and
transmitting the data using the selected MCS.
14. The method of claim 13 , wherein selecting the MCS for transmitting the data associated with the BLER target comprises:
selecting the MCS for transmitting the data associated with the BLER target from an MCS table associated with the BLER target.
15. The method of claim 14 , wherein the MCS table associated with the BLER target is used to select MCSs for data transmissions using any set of antenna ports.
16. The method of claim 14 , wherein the MCS table associated with the BLER target comprises a first MCS table used to select MCSs for data transmissions using a first set of quasi co-located antenna ports, the first MCS table being different from a second MCS table used to select MCSs for data transmissions using a second set of quasi co-located antenna ports.
17. The method of claim 12 , further comprising:
transmitting another control message indicating a channel quality indicator (CQI) table associated with each of the plurality of BLER targets.
18. The method of claim 17 , wherein the other control message comprises a medium access control (MAC) control element (MAC-CE), radio resource control (RRC) message, or a downlink control information (DCI) message.
19. An apparatus for wireless communication at a user equipment (UE), comprising:
a processor,
memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
receive a plurality of channel state information (CSI) reference signals (CSI-RSs) on corresponding CSI-RS resources associated with a CSI report, the CSI-RSs being transmitted on one or more sets of quasi co-located antenna ports;
identify, from a plurality of block error rate (BLER) targets, at least one BLER target;
receive a control message indicating a channel quality indicator (CQI) table associated with each of the plurality of BLER targets, wherein the control message includes a medium access control (MAC) control element (MAC-CE), a radio resource control (RRC) message, or a downlink control information (DCI) message;
generate the CSI report based at least in part on the at least one BLER target and the received CSI-RSs; and
transmit the generated CSI report.
20. The apparatus of claim 19 , wherein the instructions are further executable to:
determine that a single set of quasi co-located antenna ports was used to transmit the plurality of CSI-RSs on the corresponding CSI-RS resources;
identify that a same BLER target of the plurality of BLER targets is associated with the plurality of CSI-RSs received on the corresponding CSI-RS resources; and
generate the CSI report based at least in part on the same BLER target and the plurality of CSI-RSs.
21. The apparatus of claim 19 , wherein the instructions are further executable to:
determine that a first set of quasi co-located antenna ports was used to transmit a first set of the plurality of CSI-RSs and a second set of quasi co-located antenna ports was used to transmit a second set of the plurality of CSI-RSs;
identify that a single BLER target of the plurality of BLER targets is associated with the plurality of CSI-RSs received on the corresponding CSI-RS resources; and
generate the CSI report based at least in part on the single BLER target and the first and second sets of the plurality of CSI-RSs.
22. The apparatus of claim 19 , wherein the instructions are further executable to:
determine that a first set of quasi co-located antenna ports was used to transmit a first set of the plurality of CSI-RSs and a second set of quasi co-located antenna ports was used to transmit a second set of the plurality of CSI-RSs;
identify that multiple BLER targets of the plurality of BLER targets are associated with the plurality of CSI-RSs, each BLER target of the multiple BLER targets corresponding to a set of quasi co-located antenna ports used to transmit a set of the plurality of CSI-RSs; and
generate the CSI report based at least in part on the multiple BLER targets and the first and second sets of the plurality of CSI-RSs.
23. An apparatus for wireless communication at a user equipment (UE), comprising:
a processor,
memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
identify a plurality of channel state information (CSI) reference signals (CSI-RSs) to transmit on corresponding CSI-RS resources;
transmit a control message indicating at least one BLER target, of a plurality of BLER targets, wherein the indication of the at least one BLER target is included in a CSI report configuration;
transmit the plurality of CSI-RSs on the corresponding CSI-RS resources on one or more sets of quasi co-located antenna ports; and
receive a CSI report based at least in part on the at least one BLER target and the plurality of CSI-RSs.
24. The apparatus of claim 23 , wherein the instructions are further executable to:
identify a channel quality indicator (CQI) included in the CSI report associated with a BLER target of the at least one BLER target;
select a modulation and coding scheme (MCS) for transmitting data associated with the BLER target based at least in part on the CQI; and
transmit the data using the selected MCS.
25. The apparatus of claim 24 , wherein selecting the MCS for transmitting the data associated with the BLER target comprises:
selecting the MCS for transmitting the data associated with the BLER target from an MCS table associated with the BLER target.
26. The apparatus of claim 25 , wherein the MCS table associated with the BLER target is used to select MCSs for data transmissions using any set of antenna ports.
27. The apparatus of claim 25 , wherein the MCS table associated with the BLER target comprises a first MCS table used to select MCSs for data transmissions using a first set of quasi co-located antenna ports, the first MCS table being different from a second MCS table used to select MCSs for data transmissions using a second set of quasi co-located antenna ports.