The present invention relates to a wireless communication system and, specifically, to a method and a device therefor, the method comprising the steps of: transmitting a physical signal via one or more symbols; and performing a procedure for transmitting an SRS through each symbol over a plurality of symbols for beam alignment with a base station, wherein when the physical signal and the SRS overlap in a time domain and the physical signal has a higher priority than a priority of the SRS, an SRS transmission power of each symbol is equally reduced in all the plurality of symbols.