A method for performing mobility by a user equipment (UE) in a wireless communication system is provided. The method includes: receiving a report configuration from a serving cell, the report configuration including detection basis information; detecting whether a cell is present based on the detection basis information; transmitting, by the UE, a detection report reporting the detected cell is present to the serving cell; receiving a measurement configuration used for measuring the detected cell from the serving cell; measuring the cell based on the measurement configuration; and performing mobility with the cell.