A disclosure of the present specification provides a method of measuring a neighboring small cell. The method may include the steps of: receiving measurement configuration information from a serving cell; and measuring on the serving cell, the neighboring small cell, and a neighboring macro cell. The measurement configuration information may include one or more of a discovery signal measurement timing configuration (DMTC) and a measurement gap (MG) for the neighboring small cell. In addition, the DMTC may include DMTC periodicity information and information on the occasion section of a discovery signal. When a frequency band in which the serving cell operates, a frequency band in which the neighboring small cell operates, and a frequency band in which the neighboring macro cell operates are all the same, a measurement on the neighboring small cell may be performed for the time section by the DMTC and a measurement on the serving cell may be performed for sections other than the time section by the DMTC.