Method and apparatus for transreceiving wireless signal in wireless communication system

The present invention relates to a wireless communication system, and particularly, to a method and an apparatus for same, the method comprising the steps of: generating a UCI; mapping the UCI on an L number of uplink control channel units; and transmitting the mapped UCI, wherein each of the uplink control channel units comprises an Nc number of REs in a single OFDMA symbol, and the plurality of REs include an Nr number of RS transmission REs and an Nd number of UCI transmission REs, wherein Nc is the sum of Nr and Nd, and wherein L is an integer greater than or equal to one and is variable.