Method for performing harq operation in noma-based system and apparatus therefor

A user equipment (UE) for performing a hybrid automatic repeat request (HARQ) operation in a non-orthogonal multiple access (NoMA) based system, the UE comprising:

• a receiver;
• a transmitter;
• and
• a processor,
• wherein the processor is configured to:
• control the receiver to receive a downlink control information (DCI) format including a multiple access (MA) signature field for supporting NoMA transmission and receive downlink data based on a value of an MA signature indicated by the MA signature field;
• and
• perform control to transmit an acknowledgement/negative acknowledgement (ACK/NACK) signal for the downlink data based on a subframe offset value, a frequency offset value, or a sequence index value tied to the value of the indicated MA signature according to a predetermined rule,
• wherein the subframe offset value comprises a subframe offset value between a subframe in which the downlink data is received and a subframe in which the downlink HARQ feedback for the downlink data is transmitted, and
• wherein the frequency offset value indicates a frequency band for transmitting the ACK/NACK signal.