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US 12,689,419 B2Granted
Enhanced new radio (NR) type II channel state information (CSI) feedback using angle and delay reciprocity
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsXinlin Zhang, Siva Muruganathan, Shiwei Gao, Fredrik Athley, Mattias Frenne
Life of this patent
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Abstract
A method (800) performed by a base station (e.g., gNB). The method includes selecting (s802) a set of frequency domain (FD) basis vectors. The method also includes transmitting (s804) to a UE information identifying the selected FD basis vectors.
Claims19
A method performed by a base station, the method comprising:
- the base station selecting frequency domain basis vectors;
- and
- the base station transmitting to a user equipment (UE) information identifying the selected frequency domain (FD) basis vectors selected by the base station,
- wherein selecting the selected FD basis vectors comprises:
- the base station obtaining a measurement of a reference signal (RS) transmitted by the UE;
- and
- the base station selecting the FD basis vectors based on the measurement of the RS transmitted by the UE.
4 more elements
A base station, the base station comprising:
- a transmitter;
- memory;
- and
- processing circuitry, wherein the base station is configured to perform a method comprising:
- selecting frequency domain basis vectors;
- and
- employing the transmitter to transmit to a user equipment (UE) information identifying the selected frequency domain (FD) basis vectors selected by the base station,
- wherein selecting the selected FD basis vectors comprises:
- the base station obtaining a measurement of a reference signal (RS) transmitted by the UE;
- and
- the base station selecting the FD basis vectors based on the measurement of the RS transmitted by the UE.
8 more elements
A method performed by a user equipment (UE), the method comprising:
- transmitting a reference signal to a base station;
- receiving from the base station information identifying FD basis vectors selected by the base station;
- receiving from the base station a plurality of downlink (DL) reference signals (RSs) and a request for channel state information (CSI) feedback based on the plurality of DL RSs and the FD basis vectors selected by the base station;
- selecting a subset of the FD basis vectors selected by the base station and estimating CSI based on the plurality of DL RSs and the subset of the FD basis vectors selected by the UE;
- and
- transmitting to the base station a CSI report message including a set of coefficients each associated with one of the plurality of DL RSs and one of the FD basis vectors included in the subset of FD basis vectors selected by the UE.
3 more elements
A user equipment (UE), the UE comprising:
- a receiver;
- a transmitter;
- and
- processing circuitry, wherein the UE is configured to perform a method comprising:
- transmitting a reference signal to a base station;
- receiving from the base station information identifying FD basis vectors selected by the base station;
- receiving from the base station a plurality of downlink (DL) reference signals (RSs) and a request for channel state information (CSI) feedback based on the plurality of DL RSs and the FD basis vectors selected by the base station;
- selecting a subset of the FD basis vectors selected by the base station and estimating CSI based on the plurality of DL RSs and the subset of the FD basis vectors selected by the UE;
- and
- transmitting to the base station a CSI report message including a set of coefficients each associated with one of the plurality of DL RSs and one of the FD basis vectors included in the subset of FD basis vectors selected by the UE.
7 more elements
Dependencies are inferred from the claim text.