Channel state information reporting based on user equipment parameters
Certain aspects of the present disclosure provide techniques for channel state information (CSI) reporting based on user equipment (UE) parameters. A method that may be performed by a UE includes receiving a configuration to report aperiodic CSI. The method generally includes determining, based on one or more parameters, to send a first report including hybrid automatic repeat request (HARQ) feedback and not CSI feedback or a second report including HARQ feedback and CSI feedback. The method generally includes sending the first report or the second report based on the determination.
1 . An apparatus for wireless communication, the apparatus comprising:
memory comprising computer executable code;
one or more processors configured to, individually or collectively, execute the computer executable code and cause the apparatus to:
receive a configuration to report aperiodic channel state information (CSI);
determine, based on at least one of: one or more reception quality metrics, one or more capabilities of the apparatus, or one or more retransmission parameters, to send a first report type or a second report type, the first report type including hybrid automatic repeat request (HARQ) feedback and not aperiodic CSI feedback and the second report type including the HARQ feedback and the aperiodic CSI feedback; and
send a report of the first report type or the second report type based on the determination, wherein the report includes a report type indicator that indicates the report is of the first report type or is of the second report type.
2 . The apparatus of claim 1 , wherein;
the one or more reception metrics includes at least one of: an estimated spectral efficiency (SPEF), a received signal quality, a block error rate (BLER), a bit error rate (BER), an estimated interference level, a signal-to-interference plus noise ratio (SINR), or one or more log-likelihood ratios (LLRs); and
the one or more retransmission parameters includes at least one of: a best next redundancy version, a modulation and coding scheme (MCS), a number of acknowledged or negative acknowledged code blocks (CBs), a ratio between negative acknowledge CBs over a total number of CBs, a number of acknowledged or negative acknowledged code block groups (CBGs), a ratio between the negative acknowledged CBGs over a total number of CBGs, or a number of resource blocks (RBs) to achieve a target BLER.
3 . The apparatus of claim 1 , wherein the one or more capabilities of the apparatus includes a capability of the apparatus to perform CSI computations.
4 . The apparatus of claim 1 , wherein to cause the apparatus to send the report, the one or more processors are configured to, individually or collectively, cause the apparatus to:
send a first part uplink control information (UCI) including the HARQ feedback and the report type indicator; and
send a second part UCI including the CSI feedback when the apparatus sends the report of the second report type or excluding the second part of the UCI including the CSI feedback when the apparatus sends the report of the first report type.
5 . The apparatus of claim 4 , wherein to cause the apparatus to send the report, the one or more processors are configured to, individually or collectively, cause the apparatus to:
send the first part UCI using a first set of resources; and
send the second part UCI using a second set of resources different from the first set of resources.
6 . The apparatus of claim 5 , wherein the first set of resources and the second set of resources include different slots, different resource blocks within a same slot, or both.
7 . The apparatus of claim 1 , wherein to cause the apparatus to receive the configuration to report the aperiodic CSI, the one or more processors are configured to, individually or collectively, cause the apparatus to receive a downlink grant for a CSI reference signal (CSI-RS), a physical downlink shared channel (PDSCH), or both triggering reporting of the aperiodic CSI.
8 . The apparatus of claim 1 , wherein the one or more processors are configured to, individually or collectively, cause the apparatus to receive semi-static signaling via at least one of radio resource control (RRC) or medium access control (MAC) control element (MAC-CE) indicating whether dynamic CSI reporting using the first report type and the second report type is supported.
9 . The apparatus of claim 8 , wherein the one or more processors are configured to, individually or collectively, cause the apparatus to receive an indication via downlink control information (DCI) to enable or disable the dynamic CSI reporting.
10 . The apparatus of claim 9 , wherein the semi-static signaling further indicates a number of downlink grants or a number of time slots for the dynamic CSI reporting.
11 . The apparatus of claim 10 , wherein the one or more processors are configured to, individually or collectively, cause the apparatus to determine, when dynamic CSI reporting is not supported, when CSI reporting is disabled, or after the indicated number of downlink grants or time slots, to send the report of the second type.
12 . The apparatus of claim 1 , wherein the one or more processors are configured to, individually or collectively, cause the apparatus to:
determine a decrease of a rank of a current physical downlink shared channel (PDSCH); and
send the rank of the current PDSCH and a channel quality indicator (CQI) per rank.
13 . An apparatus for wireless communication, the apparatus comprising:
memory comprising computer executable code;
one or more processors configured to, individually or collectively, execute the computer executable code and cause the apparatus to:
send a grant triggering a user equipment (UE) to report aperiodic channel state information (CSI);
receive a report, from the UE, including a report type indicator that indicates the report is of a first report type including hybrid automatic repeat request (HARQ) feedback and not aperiodic CSI feedback or is of a second report type including the HARQ feedback and the aperiodic CSI feedback; and
process a report from the UE based on the indicated report type.
14 . The apparatus of claim 13 , wherein to cause the apparatus to receive the report type indicator, the one or more processors are configured to, individually or collectively, cause the apparatus to receive a first part uplink control information (UCI) including the HARQ feedback and the report type indicator.
15 . The apparatus of claim 14 , wherein to cause the apparatus to process the report based on the indicated report type, the one or more processors are configured to, individually or collectively, cause the apparatus to:
monitor a second part UCI including the aperiodic CSI feedback when the indication in the first part UCI indicates the second report type; and
not monitor the second part UCI when the indication indicates the first report type.
16 . The apparatus of claim 13 , wherein to cause the apparatus to send the grant triggering the UE to report the aperiodic CSI, the one or more processors are configured to, individually or collectively, cause the apparatus to send a grant for a physical downlink shared channel, a CSI reference signal (CSI-RS), or both.
17 . The apparatus of claim 13 , wherein the one or more processors are configured to, individually or collectively, cause the apparatus to send semi-static signaling via at least one of radio resource control (RRC) or medium access control (MAC) control element (MAC-CE) indicating whether dynamic reporting using the first report type and the second report type is supported.
18 . The apparatus of claim 17 , wherein the one or more processors are configured to, individually or collectively, cause the apparatus to send an indication via downlink control information (DCI) to enable or disable the dynamic CSI reporting.
19 . The apparatus of claim 18 , wherein the semi-static signaling further indicates a number of downlink grants or a number of time slots for dynamic CSI reporting when enabled.
20 . The apparatus of claim 19 , wherein the one or more processors are configured to, individually or collectively, cause the apparatus to receive, when dynamic CSI reporting is not supported, when dynamic CSI reporting is disabled, or after the indicated number of downlink grants or time slots, the second type of report.
21 . The apparatus of claim 13 , wherein the one or more processors are configured to, individually or collectively, cause the apparatus to:
receive a rank of a current physical downlink shared channel (PDSCH) and a channel quality indicator (CQI) per rank; and
determine a subset of layers and precoders to use for remaining PDSCH transmissions.
22 . A method for wireless communication by a user equipment (UE), the method comprising:
receiving a configuration to report aperiodic channel state information (CSI);
determining, based on at least one of: one or more reception quality metrics, one or more capabilities of the UE, or one or more retransmission parameters, to send a first report type or a second report type, the first report type including hybrid automatic repeat request (HARQ) feedback and not aperiodic CSI feedback and the second report type including the HARQ feedback and the aperiodic CSI feedback; and
sending a report of the first report type or the second report type based on the determination, wherein the report includes a report type indicator that indicates the report of the first report type or is of the second report type.
23 . The method of claim 22 , wherein:
the one or more reception metrics includes at least one of: an estimated spectral efficiency (SPEF), a received signal quality, a block error rate (BLER), a bit error rate (BER), an estimated interference level, a signal-to-interference plus noise ratio (SINR), or one or more log-likelihood ratios (LLRs); and
the one or more retransmission parameters includes at least one of: a best next redundancy version, a modulation and coding scheme (MCS), a number of acknowledged or negative acknowledged code blocks (CBs), a ratio between negative acknowledge CBs over a total number of CBs, a number of acknowledged or negative acknowledged code block groups (CBGs), a ratio between the negative acknowledged CBGs over a total number of CBGs, or a number of resource blocks (RBs) to achieve a target BLER.
24 . The method of claim 22 , wherein the one or more capabilities of the UE includes a capability of the UE to perform CSI computations.
25 . A method for wireless communication by a base station (BS), the method comprising:
sending a grant triggering a user equipment (UE) to report aperiodic channel state information (CSI);
receiving a report, from the UE, including a report type indicator that indicates the report type is of a first report type including hybrid automatic repeat request (HARQ) feedback and not aperiodic CSI feedback or is of a second report type including the HARQ feedback and the aperiodic CSI feedback; and
processing a report from the UE based on the indicated report type.
26 . The method of claim 25 , wherein receiving the report type indicator comprises receiving a first part uplink control information (UCI) including the HARQ feedback and the report type indicator.
27 . The method of claim 26 , wherein processing the report based on the indicated report type comprises:
monitoring a second part UCI including the aperiodic CSI feedback when the indication indicates the second report type; and
not monitoring the second part UCI when the indication indicates the first report type.
28 . The method of claim 25 , wherein sending the grant triggering the UE to report aperiodic CSI comprises sending a grant for a physical downlink shared channel (PDSCH), a CSI reference signal (CSI-RS), or both.