Method for transmitting or receiving downlink control channel and device using same

An operation method of a terminal in a communication system, the operation method comprising:

• receiving, from a base station, first configuration information for a first search space (SS) set and a second SS set;
• receiving, from the base station, second configuration information indicating that a first physical downlink control channel (PDCCH) candidate belonging to the first SS set is associated with a second PDCCH candidate belonging to the second SS set, and identifying that the first PDCCH candidate is associated with the second PDCCH candidate based on the second configuration information;
• performing monitoring of at least one of the first PDCCH candidate and the second candidate;
• performing reception of downlink control information (DCI(s)) in at least one of the first PDCCH candidate and the second PDCCH candidate;
• and
• receiving, from the base station, a physical downlink shared channel (PDSCH) scheduled by the received DCI(s),
• wherein the first SS set and the second SS set are associated with a first control resource set (CORESET) and a second CORESET, respectively, the monitoring of the first PDCCH candidate is performed based on a first quasi-co-location (QCL) assumption, and the monitoring of the second PDCCH candidate is performed based on a second QCL assumption.