A method for receiving a downlink signal at a user equipment, UE, in a wireless communication system, comprising: receiving downlink control information from a base station, BS, in a prescribed number of symbols starting from a first symbol of a plurality of symbols included in a subframe; receiving downlink data from the base station in the subframe according to the downlink control information; and receiving information indicating a specific subframe in which relay backhaul transmission is performed and information indicating available symbols for the user equipment in the specific subframe from the base station, wherein the downlink data is received on a frequency band in symbols corresponding to the available symbols among the plurality of symbols of the subframe when the subframe corresponds to the specific subframe, wherein the available symbols are not used for the downlink control information transmission from the base station and are not used for transmission from the base station to a relay node, RN, and wherein the method is characterized in that: the information indicating the available symbols includes a bitmap indicating positions of the available symbols by using a one-to-one correspondence to the plurality of symbols of the subframe, and a transport block size of the downlink data is determined by using a number of physical resource blocks, N PRB, determined by the following equation, when the subframe corresponds to the specific subframe: Np RB = max floor N ′ PRB * k / N sym, 1 where N' PRB is a number of physical resource blocks allocated to the user equipment, UE, Nsym is a number of symbols other than the prescribed number of symbols in the subframe, and k is a number of the available symbols for the user equipment in the subframe. receiving downlink control information from a base station, BS, in a prescribed number of symbols starting from a first symbol of a plurality of symbols included in a subframe; receiving downlink data from the base station in the subframe according to the downlink control information; and receiving information indicating a specific subframe in which relay backhaul transmission is performed and information indicating available symbols for the user equipment in the specific subframe from the base station, wherein the downlink data is received on a frequency band in symbols corresponding to the available symbols among the plurality of symbols of the subframe when the subframe corresponds to the specific subframe, wherein the available symbols are not used for the downlink control information transmission from the base station and are not used for transmission from the base station to a relay node, RN, and the information indicating the available symbols includes a bitmap indicating positions of the available symbols by using a one-to-one correspondence to the plurality of symbols of the subframe, and a transport block size of the downlink data is determined by using a number of physical resource blocks, N PRB, determined by the following equation, when the subframe corresponds to the specific subframe: Np RB = max floor N ′ PRB * k / N sym, 1 where N' PRB is a number of physical resource blocks allocated to the user equipment, UE, Nsym is a number of symbols other than the prescribed number of symbols in the subframe, and k is a number of the available symbols for the user equipment in the subframe.