Method and device for transmitting/receiving wireless signal in wireless communication system

A communication device for use in a wireless communication system, the communication device comprising:

• a memory;
• and
• a processor, the processor is configured to:
• receive scheduling information including listen-before-talk (LBT) type information and physical uplink control channel (PUCCH) resource indication information;
• receive data based on the scheduling information;
• and
• transmit acknowledgement/negative-acknowledgement (ACK/NACK) information for the data on a PUCCH resource after performing an LBT procedure based on the LBT type information,
• wherein one PUCCH resource set is selected from among a plurality of PUCCH resource sets based on a value of the LBT type information, and
• wherein the PUCCH resource is indicated by the PUCCH resource indication information within the selected PUCCH resource set.