Electronic device and method in wireless communication system, and wireless communication system
An electronic device at a base station end includes a processing circuit, the processing circuit being configured to: configure, in response to request signalling from a user equipment, an aperiodic beam-forming reference signal relevant to a first beam group for the user equipment, wherein the first beam group is determined by a base station according to channel state information periodically fed back by the user equipment; generate downlink control information, so as to indicate that the user equipment feeds back beam selection information according to the aperiodic beam-forming reference signal; determine, according to the beam selection information, one or a plurality of candidate beams and one or a plurality of corresponding second pre-coding codebooks; and determine an effective pre-coding codebook based on the one or multiple second pre-coding codebooks.
1. An electronic device at a user equipment end in a wireless communication system, the electronic device comprising processing circuitry configured to:
estimate and report wideband channel state information to a base station in response to a wideband reference signal from the base station;
determine whether a communication quality between the user equipment and the base station is lower than a predetermined threshold;
transmit a quality report, in a case where it is determined that the communication quality is lower than the predetermined threshold, to the base station; and
receive, from the base station, subband reference signal and an estimation instruction for indication the electronic device to estimate subband channel state based on the subband reference signal;
generate subband channel state information to be sent to the base station according to the subband reference signal, for the base station to determine an effective precoding codebook based on the subband channel state information.
2. The electronic device according to claim 1 , the electronic device further comprising a transceiver configured to:
transmit the subband channel state information to the base station; and
receive downlink control information from the base station;
the processing circuitry further configured to generate, in response to the downlink control information, the subband channel state information.
3. The electronic device according to claim 1 , wherein the subband channel state information includes subband channel quality indicator (CQI) or subband precoding matrix indicator (PMI).
4. The electronic device according to claim 1 , wherein the subband reference signal comprises Channel State Information-Reference Signal CSI-RS.
5. The electronic device according to claim 1 , wherein the subband channel reference signal corresponds to one or more subband channels of a wideband corresponding to the wideband reference signal.
6. A method implemented with processing circuitry at an electronic device at a user equipment end in a wireless communication system, the method comprising:
estimating and reporting wideband channel state information to a base station in response to a wideband reference signal from the base station;
determining whether a communication quality between the user equipment and the base station is lower than a predetermined threshold;
transmitting a quality report, in a case where it is determined that the communication quality is lower than the predetermined threshold, to the base station; and
receiving, from the base station, subband reference signal and an estimation instruction for indication the electronic device to estimate subband channel state based on the subband reference signal;
generating subband channel state information to be sent to the base station according to the subband reference signal, for the base station to determine an effective precoding codebook based on the subband channel state information.
7. The method according to claim 6 , further comprising
transmitting with a transceiver the subband channel state information to the base station; receiving via the transceiver downlink control information from the base station; and
generating, in response to the downlink control information, the subband channel state information.
8. The method according to claim 6 , wherein the subband channel state information includes subband channel quality indicator (CQI) or subband precoding matrix indicator (PMI).
9. The method according to claim 6 , wherein the subband reference signal comprises Channel State Information-Reference Signal CSI-RS.
10. The method according to claim 6 , wherein the subband channel reference signal corresponds to one or more subband channels of a wideband corresponding to the wideband reference signal.