Method for reporting channel state information in wireless communication system and device therefor
According to the present specification, a method for reporting channel state information (CSI) in a wireless communication system, which is performed by a UE includes: transmitting to a base station UE capability information including control information indicating a codebook configuration supported by the UE with respect to a specific class related with the CSI reporting. Therefore, there is an effect that implementation complexity of the UE can be reduced.
1. A method for reporting, by a user equipment (UE), channel state information (CSI) in a wireless communication system, the method comprising:
transmitting UE capability information,
wherein the UE capability information includes (i) information for whether the UE supports a non-precoded channel state information-reference signal (CSI-RS) based CSI reporting and (ii) one or more codebook configurations, supported by the UE,
wherein the one or more codebook configurations are related to the non-precoded CSI-RS based CSI reporting,
wherein each of the one or more codebook configurations is associated with information for subset of a codebook,
wherein the information for subset of the codebook is configured differently based on an oversampling parameter and the number of antenna ports, for each of the one or more codebook configurations;
receiving CSI-RS configuration information,
wherein the non-precoded CSI-RS based CSI reporting is configured based on the CSI-RS configuration information,
wherein a specific codebook configuration among the one or more codebook configurations is indicated based on the CSI-RS configuration information;
receiving a CSI-RS based on the CSI-RS configuration information;
measuring a CSI based on the CSI-RS and the specific codebook configuration; and
reporting the CSI.
2. The method of claim 1 , wherein the oversampling parameter comprises a horizontal oversampling value and a vertical oversampling value, and
wherein the number of antenna ports comprises the number of horizontal antenna ports and the number of vertical antenna ports.
3. The method of claim 2 , wherein each of the one or more codebook configurations further includes information for whether to support code division multiplexing (CDM)-4.
4. The method of claim 1 , wherein each of the one or more codebook configurations is differently configured based on a rank.
5. The method of claim 1 ,
wherein the measuring of the CSI further includes selecting one antenna port group based on the specific codebook configuration.
6. The method of claim 1 , wherein the UE capability information is transmitted for each band or for each band combination.
7. The method of claim 1 , wherein the UE capability information further includes measurement restriction (MR) related information.
8. A user equipment (UE) for reporting channel state information (CSI) in a wireless communication system, the UE comprising:
one and more transceivers;
one and more processors; and
one and more memories connecting with the one and more processors and storing instructions for operations performed by the one and more processors,
wherein the operations comprise:
transmitting UE capability information,
wherein the UE capability information includes (i) information for whether the UE supports a non-precoded channel state information-reference signal (CSI-RS) based CSI reporting and (ii) one or more codebook configurations, supported by the UE,
wherein the one or more codebook configurations are related to the non-precoded CSI-RS based CSI reporting,
wherein each of the one or more codebook configurations is associated with information for subset of a codebook,
wherein the information for subset of the codebook is configured differently based on an oversampling parameter and the number of antenna ports, for each of the one or more codebook configurations;
receiving CSI-RS configuration information,
wherein the non-precoded CSI-RS based CSI reporting is configured based on the CSI-RS configuration information,
wherein a specific codebook configuration among the one or more codebook configurations is indicated based on the CSI-RS configuration information;
receiving a CSI-RS based on the CSI-RS configuration information;
measuring a CSI based on the CSI-RS and the specific codebook configuration; and
reporting the CSI.
9. A method for receiving, by a base station (BS), channel state information (CSI) in a wireless communication system, the method comprising:
receiving, from a user equipment (UE), UE capability information,
wherein the UE capability information includes (i) information for whether the UE supports a non-precoded channel state information-reference signal (CSI-RS) based CSI reporting and (ii) one or more codebook configurations supported by the UE,
wherein the one or more codebook configurations are related to the non-precoded CSI-RS based CSI reporting,
wherein each of the one or more codebook configurations is associated with information for subset of a codebook,
wherein the information for subset of the codebook is configured differently based on an oversampling parameter and the number of antenna ports, for each of the one or more codebook configurations;
transmitting CSI-RS configuration information,
wherein the non-precoded CSI-RS based CSI reporting is configured based on the CSI-RS configuration information,
wherein a specific codebook configuration among the one or more codebook configurations is indicated based on the CSI-RS configuration information;
transmitting a CSI-RS; and
receiving the CSI measured based on the CSI-RS and the specific codebook configuration.
10. The method of claim 9 , wherein the oversampling parameter comprises a horizontal oversampling value and a vertical oversampling value, and
wherein the number of antenna ports comprises the number of horizontal antenna ports and the number of vertical antenna ports.
11. The method of claim 1 , wherein each of the one or more codebook configurations is indexed by one of 1 to 4.