The present specification relates to a method for performing uplink transmission in a wireless communication system. More specifically, a method performed by a terminal comprises the steps of: transmitting, to a base station, a plurality of PRACH preambles related to a plurality of transmission units indicating a physical layer resource set; receiving, from the base station, a plurality of random access responses (RARs) corresponding to the plurality of PRACH preambles, wherein each of the plurality of RARs comprises a temporary cell (TC)-RNTI; and transmitting, to the base station, a plurality of uplink signals on the basis of the plurality of RARs, wherein the uplink signals comprise information on overlapped TC-RNTIs.