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

A user equipment (UE) operating in a wireless communication system, the UE comprising:

• at least one radio frequency (RF) unit;
• 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 perform operations comprising:
• monitoring a plurality of physical downlink control channel (PDCCH) candidate sets within a search space (SS) set on a scheduling cell, thereby detecting a PDCCH including scheduling information for at least one cell,
• wherein:
• each PDCCH candidate set is associated with only one corresponding cell index, and
• based on the at least one cell corresponding to a plurality of cells, PDCCH candidates for the PDCCH are configured in a PDCCH candidate set associated with a minimum cell index from among cell indexes of the plurality of cells;
• and
• performing data communication on the at least one cell, based on the PDCCH.

A method of performing communication by a base station (BS) in a wireless communication system, the method comprising:

• transmitting a physical downlink control channel (PDCCH) including scheduling information for at least one cell through a plurality of physical downlink control channel (PDCCH) candidate sets within a search space (SS) set on a scheduling cell,
• wherein:
• each PDCCH candidate set is associated with one corresponding cell index, and
• based on the at least one cell corresponding to a plurality of cells, PDCCH candidates for the PDCCH are configured in a PDCCH candidate set associated with a minimum cell index from among cell indexes of the plurality of cells;
• and
• performing data communication on the at least one cell, based on the PDCCH.

A base station (BS) operating in a wireless communication system, the BS comprising:

• at least one radio frequency (RF) unit;
• 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 perform operations comprising:
• transmitting a physical downlink control channel (PDCCH) including scheduling information for at least one cell through a plurality of physical downlink control channel (PDCCH) candidate sets within a search space (SS) set on a scheduling cell,
• wherein:
• each PDCCH candidate set is associated with one corresponding cell index, and
• based on the at least one cell corresponding to a plurality of cells, PDCCH candidates for the PDCCH are configured in a PDCCH candidate set associated with a minimum cell index from among cell indexes of the plurality of cells;
• and
• performing data communication on the at least one cell, based on the PDCCH.