A method of configuring a measurement for a mobile terminal configured with a plurality of component carriers in a wireless communication system is discussed. The method is performed by a base station and includes transmitting, by the base station, configuration information to the mobile terminal. Further, when the transmitted configuration information includes an indication information for the measurement in an extension component carrier among the plurality of component carriers, the measurement in the extension component carrier is based on a channel state information reference signal (CSI-RS), and when the transmitted configuration information does not include the indication information for the measurement in the extension component carrier among the plurality of component carriers, the measurement in the extension component carrier is based on a common reference signal (CRS).