Method for transmitting uplink control channel in wireless communication system and device therefor

A terminal configured to support multiple TTI (transmission time interval) lengths in a wireless communication system, the terminal comprising:

• a transmitter and a receiver;
• and
• a processor, operatively coupled to the transmitter and the receiver, configured to:
• control the receiver to receive a first PDSCH (physical downlink shared channel) based on a first TTI length at first timing, control the receiver to receive a second PDSCH based on a second TTI length different from the first TTI length at second timing, wherein when a TTI for transmitting an uplink control channel for the first PDSCH overlaps a TTI for transmitting an uplink control channel for the second PDSCH, the processor controls the transmitter to transmit uplink control information for the first PDSCH and the second PDSCH on a PUCCH (physical uplink control channel) based on the first TTI length or the second TTI length, whichever is the shorter TTI length.