Method for executing HARQ in wireless communication system and device therefor

A user equipment (UE) for performing a hybrid automatic request (HARQ) in a wireless communication system, the user equipment comprising:

• a transmitter and a receiver configured to respectively transmit and receive radio signals;
• and
• a processor functionally connected to the transmitter and the receiver,
• wherein the processor controls to:
• receive an initial HARQ packet corresponding to a specific HARQ Process ID (PID) through a first radio link from a first base station;
• receive a retransmission HARQ packet corresponding to the HARQ Process ID (PID) through a second radio link from a second base station;
• combine the initial HARQ packet and the retransmission HARQ packet;
• decode the combined HARQ packet;
• and
• determine whether to transmit HARQ feedback through the first radio link based on a result of the decoding,
• wherein if the decoding fails, the determining whether to transmit the HARQ feedback comprises checking whether a reception number of the initial HARQ packet and the retransmission HARQ packet exceeds an HARQ maximum retransmission number while an HARQ-related timer operates.