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

A method for transmitting a physical downlink control channel (PDCCH) by a base station (BS), the method comprising:

• transmitting information about a plurality of search space sets and a plurality of groups including some parts of the plurality of search space sets;
• transmitting information about one group for transmitting the PDCCH among the plurality of groups;
• and
• transmitting the PDCCH based on a search space set satisfying a predetermined condition among search space sets corresponding to the one group,
• wherein the predetermined condition includes a condition in which the number of PDCCH candidates and the number of non-overlapping control channel elements (CCEs) are less than or equal to a specific value.

A user equipment (UE) for monitoring a physical downlink control channel (PDCCH), the UE comprising:

• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• obtaining information about a plurality of search space sets and a plurality of groups including some parts of the plurality of search space sets;
• obtaining information about one group for monitoring the PDCCH among the plurality of groups;
• and
• monitoring the PDCCH based on a search space set satisfying a predetermined condition among search space sets corresponding to the one group,
• wherein the predetermined condition includes a condition in which the number of PDCCH candidates and the number of non-overlapping control channel elements (CCEs) are less than or equal to a specific value.