1. A method for a wireless communication system, the method comprising:receiving resource information indicating a resource for an enhanced physical downlink control channel (EPDCCH);
identifying a set of antenna ports of a reference signal for the resource based on a transmission mode applied to the resource;
identifying an antenna port of the reference signal for the resource among the set of antenna ports of the reference signal based on an identifier of a terminal; and
receiving downlink control information on the EPDCCH using the antenna port of the reference signal.