In the radio communication system 1, a physical downlink shared channel (PDSCH) shared by the respective user terminals 20, a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH), and the like may be used as downlink channels.

Further, a physical uplink shared channel (PUSCH) shared by the respective user terminals 20, a physical uplink control channel (PUCCH), a physical random access channel (PRACH), and the like may be used as uplink channels in the radio communication system 1.

User data, higher layer control information, a system information block (SIB) are transmitted by PDSCH. PUSCH may transmit user data, higher layer control information, and the like. Further, the PBCH may transmit a master information block (MIB).

PDCCH may transmit lower layer control information. The lower layer control information may include, for example, downlink control information (DCI) including scheduling information of at least one of PDSCH and PUSCH.

Note that DCI that schedules PDSCH may be referred to as DL assignment, DL DCI, or the like, and DCI scheduling PUSCH may be referred to as UL grant, UL DCI, or the like. Note that PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

A control resource set (CORESET) and a search space may be used to detect PDCCH. CORESET corresponds to a resource that searches for DCI. The search space corresponds to a search area and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. UE may monitor CORESET associated with a certain search space based on search space configuration.