Method for performing uplink synchronization in wireless communication system and apparatus therefor

Abstract

A method for performing uplink synchronization by a terminal in a millimeter wave (mmWave)-based wireless communication system according to an embodiment of the present invention comprises the steps of: repeatedly transmitting a first type random access preamble through a plurality of coarse beams that are sequentially formed for different directions; performing a first timing advance (TA) adjustment on the basis of a response of a base station with respect to a repeated transmission of the first type random access preamble; and transmitting a second type random access preamble through at least one fine beam having a smaller beam width than the coarse beams, wherein the sequence of the second type random access preamble transmitted after the first TA adjustment is configured to be shorter than the sequence of the first type random access preamble on the time axis.

Dependencies are inferred from the claim text.