Method for managing beam performed by terminal in wireless communication system, and terminal using same

1. A beam management method performed by a user equipment (UE) in a wireless communication system, the method comprising:

performing a power saving operation on a first cell;

receiving request information through a physical downlink control channel (PDCCH) of a second cell, wherein the request information requests a measurement of a reference signal aperiodically transmitted from the first cell; and

measuring the reference signal in the first cell; and

generate beam-related information for the first cell based on the measured reference signal,

wherein the reference signal is received at a start point of a discontinuous reception (DRX) ON duration or before a specific time from the start point for a DRX cycle including the DRX ON duration and a DRX OFF duration, and

wherein based on a length of the DRX cycle being greater than or equal to a specific value, the reference signal measured by the UE is a first reference signal for the beam-related information and based on the length of the DRX cycle being less than the specific value, the reference signal measured by the UE is a second reference signal for the beam-related information.

2. The method of claim 1 , wherein the PDCCH indicates any one of reference signal sets configured by a higher layer signal.

3. The method of claim 1 , wherein a configuration for at least one of whether to perform PDCCH monitoring, a PDCCH monitoring period, and whether to apply a power saving mode for the first cell is received through the second cell.

4. The method of claim 1 , wherein the power saving operation is an operation of not performing a beam management operation in the DRX OFF duration of the DRX cycle including the DRX ON duration and the DRX OFF duration.

5. The method of claim 1 , wherein the first cell is a secondary cell configured for the UE and the second cell is a primary cell or another secondary cell configured for the UE.

6. The method of claim 1 , wherein the reference signal is received at the start point of the DRX ON duration or before the specific time from the start point, only when a length of the DRX cycle is a predetermined value or greater.

7. The method of claim 1 , wherein another reference signal is further received at a time point after the lapse of a predetermined time from a time point at which the DRX ON duration is terminated in the DRX cycle including the DRX ON duration and the DRX OFF duration.

8. The method of claim 1 , wherein the reference signal is a reference signal for beam management, a reference signal for beam failure detection, or a reference signal for beam recovery.

9. The method of claim 8 , wherein a higher layer signal indicating a type of the reference signal is further received.

10. The method of claim 1 , wherein the beam-related information is reported to a base station.

11. The method of claim 1 , wherein the PDCCH is monitored in the first cell based on the beam-related information.

12. The method of claim 1 , wherein the power saving operation is not performed on the second cell.

13. The method of claim 1 , wherein the PDCCH includes information indicating the specific time.

14. A user equipment (UE) comprising:

a transceiver configured to transmit and receive a wireless signal; and

a processor operably coupled with the transceiver,

wherein the processor is configured to perform a power saving operation on a first cell,

to receive request information through a physical downlink control channel (PDCCH) of a second cell, wherein the request information requests a measurement of a reference signal aperiodically transmitted from the first cell, and

to measure the reference signal in the first cell, and

to generate beam-related information for the first cell based on the measured reference signal,

wherein the reference signal is received at a start point of a discontinuous reception (DRX) ON duration or before a specific time from the start point for a DRX cycle including the DRX ON duration and a DRX OFF duration, and

wherein based on a length of the DRX cycle being greater than or equal to a specific value, the reference signal measured by the UE is a first reference signal f or the beam-related information and based on the length of the DRX cycle being less than the specific value, the reference signal measured by the UE is a second reference signal for the beam-related information.