Method and device for transmitting and receiving wireless signals in wireless communication system

A user equipment (UE) used in a wireless communication system supporting an unlicensed band, comprising:

• at least one processor;
• and
• at least one computer memory operably coupled to the at least one processor and configured to cause, when executed, the at least one processor to perform an operation, the operation comprising:
• receiving Downlink Control Information (DCI) including a field used for indicating whether a plurality of resource block (RB) sets in a serving cell are available,
• wherein, based on that a first mode is configured for the serving cell, the field is 1-bit used for indicating whether the serving cell is available, and
• wherein, based on that a second mode is configured for the serving cell, the field is a bitmap and each bit of the bitmap is used for indicating whether each of the plurality of RB sets in the serving cell is available;
• and
• receiving a downlink data based on the field.

A base station (BS) used in a wireless communication system supporting an unlicensed band, comprising:

• at least one processor;
• and
• at least one computer memory operably coupled to the at least one processor and configured to cause, when executed, the at least one processor to perform an operation, the operation comprising:
• transmitting Downlink Control Information (DCI) including a field used for indicating whether a plurality of resource block (RB) sets in a serving cell are available,
• wherein, based on that a first mode is configured for the serving cell, the field is 1-bit used for indicating whether the serving cell is available, and
• wherein, based on that a second mode is configured for the serving cell, the field is a bitmap and each bit of the bitmap is used for indicating whether each of the plurality of RB sets in the serving cell are available;
• and
• transmitting a downlink data based on the field.