Method for receiving reference signal in wireless communication system and apparatus therefor

1. A method for receiving a channel state information (CSI)-reference signal (RS) by a user equipment (UE) in a wireless communication system, the method comprising:

receiving synchronization signal blocks (SSBs) based on a plurality of SSB indexes;

receiving CSI-RS configuration information;

receiving a CSI-RS based on the CSI-RS configuration information and the SSBs,

wherein the CSI-RS configuration information includes i) information for a plurality of CSI-RS resources and ii) QCL information for each of the plurality of CSI-RS resources,

wherein a spatial property of a beam related to transmission of the CSI-RS is independent for each of the plurality of CSI-RS resources, and

wherein based on i) the CSI-RS is related to a specific CSI-RS resource among the plurality of CSI-RS resources and ii) the QCL information related to the specific CSI-RS resource represents a specific SSB index among the plurality of SSB indexes:

the CSI-RS is assumed to be quasi co-located (QCL) with an SSB based on the specific SSB index, with respect to a spatial reception parameter.

2. The method of claim 1 , wherein the SSB includes at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), or a physical broadcast channel (PBCH).

3. The method of claim 1 , wherein the CSI-RS configuration information is received through radio resource control (RRC) signaling.

4. The method of claim 1 , wherein the QCL information includes a QCL type for a QCL parameter set to which the QCL assumption is applied.

5. The method of claim 4 , wherein the QCL type is defined to indicate different QCL parameter sets for each QCL type.

6. The method of claim 5 , wherein the QCL parameter set includes at least one of a delay spread, a Doppler spread, a Doppler shift, an average delay or the spatial reception parameter.

7. The method of claim 1 , wherein the spatial reception parameter includes at least one of a reception beam direction parameter or a reception beam width related parameter.

8. The method of claim 4 , wherein the QCL type related to the QCL assumption is based on a specific QCL type.

9. The method of claim 8 , wherein a QCL parameter set related to the specific QCL type includes the spatial reception parameter.

10. The method of claim 1 , wherein the CSI-RS is based on a periodic CSI-RS.

11. A method for transmitting a channel state information (CSI)-reference signal (RS) by a base station in a wireless communication system, the method comprising:

transmitting synchronization signal blocks (SSBs) based on a plurality of SSB indexes;

transmitting CSI-RS configuration information;

transmitting a CSI-RS based on the CSI-RS configuration information and the SSBs,

wherein the CSI-RS configuration information includes i) information for a plurality of CSI-RS resources and ii) QCL information for each of the plurality of CSI-RS resources,

wherein a spatial property of a beam related to transmission of the CSI-RS is independent for each of the plurality of CSI-RS resources, and

wherein based on i) the CSI-RS is related to a specific CSI-RS resource among the plurality of CSI-RS resources and ii) the QCL information related to the specific CSI-RS resource represents a specific SSB index among the plurality of SSB indexes:

the CSI-RS is assumed to be quasi co-located (QCL) with an SSB based on the specific SSB index, with respect to a spatial reception parameter.

12. The method of claim 11 , wherein the SSB includes at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), or a physical broadcast channel (PBCH).

13. The method of claim 11 , wherein the CSI-RS configuration information is transmitted through radio resource control (RRC) signaling.

14. The method of claim 11 , wherein the QCL information includes a QCL type for a QCL parameter set to which the QCL assumption is applied.

15. The method of claim 14 , wherein the QCL type is defined to indicate different QCL parameter sets for each QCL type.

16. The method of claim 15 , wherein the QCL parameter set includes at least one of a delay spread, a Doppler spread, a Doppler shift, an average delay or the spatial reception parameter.

17. The method of claim 11 , wherein the spatial reception parameter includes at least one of a reception beam direction parameter or a reception beam width related parameter.

18. The method of claim 14 , wherein the QCL type related to the QCL assumption is based on a specific QCL type.

19. The method of claim 11 , wherein the CSI-RS is based on a periodic CSI-RS.

20. A base station for transmitting a channel state information (CSI)-reference signal (RS) in a wireless communication system, the base station comprising:

a radio frequency (RF) unit transmitting and receiving a radio signal; and

a processor controlling the RF unit,

wherein the processor is configured to:

transmit synchronization signal blocks (SSBs) based on a plurality of SSB indexes,

transmit CSI-RS configuration information,

transmit a CSI-RS based on the CSI-RS configuration information and the SSBs,

wherein the CSI-RS configuration information includes i) information for a plurality of CSI-RS resources and ii) QCL information for each of the plurality of CSI-RS resources,

wherein a spatial property of a beam related to transmission of the CSI-RS is independent for each of the plurality of CSI-RS resources, and

wherein based on i) the CSI-RS is related to a specific CSI-RS resource among the plurality of CSI-RS resources and ii) the QCL information related to the specific CSI-RS resource represents a specific SSB index among the plurality of SSB indexes:

the CSI-RS is assumed to be quasi co-located (QCL) with an SSB based on the specific SSB index, with respect to a spatial reception parameter.