Method by which terminal performs frequency measurement, and device

A user equipment (UE) for performing frequency measurement in a wireless communication system, the UE comprising:

• a memory;
• a transceiver;
• and
• a processor to connect the memory and the transceiver,
• wherein the processor is configured to:
• control the transceiver to receive an intra-frequency measurement threshold value and an inter-frequency measurement threshold value for a reduced performance measurement group;
• measure a signal level of a serving cell;
• and
• perform frequency measurement on the basis of the measured signal level of the serving cell and the received threshold values, and
• the intra-frequency measurement threshold value is greater than the inter-frequency measurement threshold value for the reduced performance measurement group.