Method for performing random access procedure in next generation wireless communication system and apparatus therefor

A user equipment configured to operate in a wireless communication system, the user equipment comprising:

• a wireless communication module;
• and a processor connected to the wireless communication module and configured to perform operations comprising:
• obtaining, from a higher layer of the user equipment, an indication to perform a simplified random access procedure;
• transmitting a random access signal to a base station in a transmission interval;
• and receiving, from the base station, a random access response (RAR) signal including a timing advance (TA) command in response to the random access signal;
• and transmitting, to the base station, only a physical uplink control channel (PUCCH) including ACK information after detecting the RAR signal which is in response to the random access signal, wherein the random access signal includes a transmission of a random access preamble in a physical random access channel (PRACH), a transmission of physical uplink shared channel (PUSCH), and a contention resolution ID, wherein a beam direction for the transmission of the random access preamble in the PRACH and a beam direction for the transmission of the PUSCH are equal to each other, wherein a TA value of the transmission of the random access preamble in the PRACH is configured to zero and a TA value of the transmission of the PUSCH is configured to zero, and wherein the RAR signal further includes the contention resolution ID and a physical uplink control channel (PUCCH) resource indicator.