The present invention relates to a wireless communication system. More particularly, the present invention relates to a method and apparatus for a terminal to receive a downlink signal in a wireless communication system. The method includes the steps of: receiving a downlink signal through a downlink period in a subframe including the downlink period, a gap period, and an uplink period; and demodulating the downlink signal, wherein the length of the downlink period is less than or equal to half of the subframe. When the downlink signal is received on a first type of carrier, the downlink signal is demodulated using a first cell-common reference signal. When the downlink signal is received on a second type of carrier, the downlink signal is demodulated using a terminal-specific reference signal.