HARQ performing method for shortened TTI support in wireless communication system, and apparatus therefor

A base station (BS) configured to operate in a wireless communication system, the BS comprising:

• a transceiver;
• at least one processor;
• and
• at least one computer memory operably connected to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:
• transmitting, to a user equipment (UE), a downlink signal on a downlink resource based on a first type of transmission time interval (TTI);
• and
• receiving, from the UE, an uplink signal related to the downlink signal on an uplink resource based on a second type of TTI,
• wherein the first type of TTI is shorter than the second type of TTI, and
• wherein the uplink resource, which is based on the second type of TTI, is determined based on the downlink resource, which is based on the first type of TTI,
• wherein a single uplink resource based on the second type of TTI corresponds to a plurality of downlink resources based on the first type of TTI, and
• wherein a length of the second type of TTI is greater than a twice of a length of the first type of TTI.

A communication apparatus comprising:

• at least one processor;
• and
• at least one computer memory operably connected to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:
• transmitting, to a user equipment (UE), a downlink signal on a downlink resource based on a first type of transmission time interval (TTI);
• and
• receiving, from the UE, an uplink signal related to the downlink signal on an uplink resource based on a second type of TTI,
• wherein the first type of TTI is shorter than the second type of TTI,
• wherein the uplink resource, which is based on the second type of TTI, is determined based on the downlink resource, which is based on the first type of TTI,
• wherein a single uplink resource based on the second type of TTI corresponds to a plurality of downlink resources based on the first type of TTI, and
• wherein a length of the second type of TTI is greater than twice a length of the first type of TTI.