Disclosed is a method for a wireless device for transmitting a random-access preamble. The method may comprise the steps of: generating a sequence of a random-access preamble; and mapping the sequence of a random-access preamble to one sub-carrier wave from among 12 sub-carrier waves of a frequency domain. The mapping step may comprise the step for carrying out a first hop between a plurality of sub-regions. Each sub-region may comprise a previously set number of sub-carrier waves. The mapping step may additionally comprise the step for carrying out a second hop from among the sub-carrier waves within any one sub-region.