Method and apparatus for transceiving wireless signal in wireless communication system

An apparatus for use in a wireless communication system, the apparatus comprising:

• a memory;
• and
• a processor connected to the memory,
• wherein the processor is configured to:
• transmit a downlink control information (DCI) for a plurality of unlicensed frequency bands,
• wherein the DCI includes a plurality of information related with channel occupancies of the plurality of unlicensed frequency bands, and
• perform a communication in a contiguous time period of one of the plurality of unlicensed frequency bands, associated with the DCI,
• wherein the plurality of information have a one-to-one mapping with the plurality of unlicensed frequency bands, and each of the plurality of information indicates whether a corresponding one of the plurality of unlicensed frequency bands is available or not until an end of the contiguous time period.