A method for transmitting data by a UE in a wireless communication system, according to an embodiment of the present invention, comprises the steps of: transmitting a first message through time-frequency resources; and, if a UE must transmit a second message which is related to the first message, transmitting the second message through a frequency resource region which is the same as a frequency resource region in the time-frequency resources after predetermined time from the time-frequency resources, wherein the predetermined time is determined on the basis of bits selected from a plurality of bits by means of the UE, wherein the bits which can be selected from the plurality of bits by means of the UE are permitted by a period-related parameter transferred by means of upper layer signaling.