Method for reporting channel state information in wireless communication system, and device therefor
The present disclosure provides a method for reporting channel state information (CSI) in a wireless communication system, and a device therefor. Specifically, the present invention provides a method for reporting CSI via a physical uplink shared channel (PUSCH) by a user equipment (UE) in a wireless communication system, the method comprising the steps of: receiving configuration information from a base station (BS), wherein the configuration information comprises (i) a CSI-related configuration and (ii) a configuration related to a transmission power control of the PUSCH; receiving a CSI-reference signal (CSI-RS) from the base station on the basis of the CSI-related configuration; calculating the CSI on the basis of the CSI-RS, wherein the CSI comprises information related with coefficients, elements of the information related with coefficients are classified into multiple groups on the basis of priority values thereof, and the priority values have an ascending sequence in which, with reference to a predefined particular index, a higher index and a lower index of frequency-domain indices related to the elements sequentially alternate; and on the basis of predetermined priorities of the multiple groups, transmitting a CSI report configured by omitting a portion of the multiple groups, to the base station via the PUSCH, wherein transmission power of the PUSCH is determined on the basis of the configuration information.
1. A method of reporting channel state information (CSI) through physical uplink shared channel (PUSCH), by a user equipment (UE), in a wireless communication system, the method comprising:
receiving, from a base station, configuration information,
wherein the configuration information includes (i) a CSI related configuration and (ii) a configuration related to transmission power control of the PUSCH;
receiving, from the base station, a CSI-reference signal (CSI-RS) based on the CSI related configuration;
obtaining CSI based on the CSI-RS,
wherein the CSI includes information related to coefficients,
wherein each of elements of the information related to the coefficients is classified as a plurality of groups based on a priority value,
wherein the priority value is determined based on i) a layer index, ii) an index of a spatial domain related to each of the element and iii) an index of a frequency domain related to each of the elements, and
wherein the priority value increases as an order in which a higher index and a lower index of indexes of a frequency domain related to the elements are sequentially crossed based on a predefined specific index; and
transmitting, to the base station, a CSI report configured by omitting, among the plurality of groups, a portion of the plurality of groups based on a pre-defined priority of the plurality of groups, through the PUSCH,
wherein a transmission power of the PUSCH is determined based on the configuration information.
2. The method of claim 1 ,
wherein the smaller the priority value, the higher the priority of each element.
3. The method of claim 1 ,
wherein the priority value increases in an ascending order of the index of the spatial domain.
4. The method of claim 1 ,
wherein a priority of i) the index of the spatial domain of a strongest coefficient and ii) an index of the spatial domain corresponding to a beam having an opposite polarization with respect to a beam corresponding to the strongest coefficient is the highest.
5. The method of claim 1 ,
wherein the predefined specific index is related to an index in the frequency domain of a strongest coefficient among the coefficients.
6. The method of claim 1 ,
wherein the predefined specific index is 0.
7. The method of claim 1 ,
wherein the CSI report consists of a first part and a second part, and
wherein the CSI report is omitted in the second part.
8. The method of claim 1 ,
wherein the CSI report further includes information related to omission of the portion among the plurality of groups.
9. The method of claim 8 ,
wherein the information related to the omission includes at least one of (i) information on whether to omit, (ii) information on an object to be omitted or (iii) information on a quantity to be omitted.
10. The method of claim 1 ,
wherein the information related with coefficients includes at least one of information on an amplitude coefficient, ii) information on a phase coefficient, or iii) bitmap information related to the amplitude coefficient and the phase coefficient.
11. The method of claim 1 ,
wherein a resource region for transmitting the PUSCH is allocated based on the CSI related configuration, and
wherein a payload size of the computed CSI exceeds the resource region.
12. A user equipment (UE) to report channel state information (CSI) through physical uplink shared channel (PUSCH) in a wireless communication system, the UE comprising:
one or more transceivers;
one or more processors; and
one or more memories storing instructions for operations executed by the one or more processors and coupled to the one or more processors,
wherein the operations comprise:
receiving, from a base station, configuration information,
wherein the configuration information includes (i) a CSI related configuration and (ii) a configuration related to transmission power control of the PUSCH;
receiving, from the base station, a CSI-reference signal (CSI-RS) based on the CSI related configuration;
obtaining CSI based on the CSI-RS,
wherein the CSI includes information related to coefficients,
wherein each of elements of the information related to the coefficients is classified as a plurality of groups based on a priority value,
wherein the priority value is determined based on i) a layer index, ii) an index of a spatial domain related to each of the element and iii) an index of a frequency domain related to each of the elements, and
wherein the priority value increases as an order in which a higher index and a lower index of indexes of a frequency domain related to the elements are sequentially crossed based on a predefined specific index; and
transmitting, to the base station, a CSI report configured by omitting, among the plurality of groups, a portion of the plurality of groups based on a pre-defined priority of the plurality of groups, through the PUSCH,
wherein a transmission power of the PUSCH is determined based on the configuration information.
13. A method of receiving channel state information (CSI) through physical uplink shared channel (PUSCH), by a base station, in a wireless communication system, the method comprising:
transmitting, to a user equipment (UE), configuration information,
wherein the configuration information includes (i) a CSI related configuration and (ii) a configuration related to transmission power control of the PUSCH;
transmitting, to the UE, a CSI-reference signal (CSI-RS) based on the CSI related configuration; and
receiving, from the UE, a CSI report including CSI measured based on the CSI-RS, through the PUSCH,
wherein the CSI includes information related to coefficients,
wherein each of elements of the information related to the coefficients is classified as a plurality of groups based on a priority value,
wherein the priority value is determined based on i) a layer index, ii) an index of a spatial domain related to each of the element and iii) an index of a frequency domain related to each of the elements, and
wherein the priority value increases as an order in which a higher index and a lower index of indexes of a frequency domain related to the elements are sequentially crossed based on a predefined specific index,
wherein the CSI report is configured by omitting, among the plurality of groups, a portion of the plurality of groups based on a pre-defined priority of the plurality of groups, and
wherein a transmission power of the PUSCH is determined based on the configuration information.