Method for transmitting harq-ack signal in wireless communication system, and apparatus therefor

A user equipment (UE) for receiving retransmitted data in a wireless communication system, the UE comprising:

• a radio frequency (RF) module configured to transmit and receive a radio signal to and from a base station (BS);
• and
• a processor connected to the RF module and configured to
• receive a plurality of transport blocks including a plurality of code block groups from the BS,
• map a plurality of code block groups to first hybrid automatic request (HARQ)-acknowledgement (ACK) signals, based on an order of reception of each of the plural transport blocks and an order of the code block groups included in each of the plural transport blocks, and transmit the first HARQ-ACK signals, and
• receive one or more code block groups retransmitted based on the transmitted first HARQ-ACK signals.