The present invention relates to a wireless communication system. Particularly, the present invention relates to a method for controlling a UL transmission by a terminal in a wireless communication system, and an apparatus therefor, the method comprising the steps of: configuring a first cell of a first UL-DL configuration and a second cell of a second UL-DL configuration, wherein SF # n is a UL SF or an S SF and SF # n+1 is a UL SF in the first cell, and SF # n is a DL SF in the second cell; and controlling a UL transmission in SF # n+1 of the first cell, wherein, when the priority of the first cell is higher than the second cell in SF # n, the UL transmission in SF # n+1 of the first cell is normally performed, and when the priority of the first cell is lower than the second cell in the SF # n, at least a part of the UL transmission in the SF # n+1 of the first cell is limited.