Method for performing random access in wireless communication system using mmWave band

A user equipment performing a random access in a wireless communication system using a mmWave band, the user equipment comprising:

• a transmitter;
• a receiver;
• and
• a processor operates by being connected to the transmitter and the receiver,
• wherein the processor:
• obtains information on a sequence set and a phase pattern vector set to use for a random access procedure,
• selects a phase pattern vector corresponding to a repetitive transmission count of a random access channel (RACH) signal among a plurality of phase pattern vectors included in the phase pattern vector set,
• controls the transmitter to transmit the RACH signal generated using a sequence selected among a plurality of sequences included in the sequence set and the selected phase pattern vector to a base station for time intervals amounting to the repetitive transmission count, and
• controls the receiver to receive a RACH response signal indicating an estimated sequence and an estimated phase pattern vector from the base station,
• wherein the RACH signal is generated by multiplying elements configuring the selected phase pattern vector by the selected sequence in each of the time intervals amounting to the repetitive transmission count.