One disclosure of the present specification provides a method for performing a measurement. The method may comprise: receiving, from a serving cell, a first measurement subframe pattern for the serving cell and assistance information on a cell-specific reference signal (CRS) of a first neighboring cell and a second neighboring cell; and receiving, from the serving cell, a second measurement subframe pattern for the first and second neighboring cells. Here, both the serving cell and the first neighboring cell are aggressor cells against a victim cell which is the second neighboring cell, and the received second measurement subframe pattern may be set based on an almost blank subframe (ABS) pattern, when a CRS of the serving cell collides with the CRS of the second neighboring cell but the CRS of the first neighboring cell does not collide with the CRS of the second neighboring cell.