A terminal is disclosed including a receiver that monitors physical downlink control channel (PDCCH) candidates within a control resource set (CORESET); and a processor that determines control resource element (CCE) indexes for a plurality of PDCCH candidates corresponding to an aggregation level and a carrier indicator field (CIF) value, wherein when a CIF for a serving cell that is monitored by the plurality of PDCCH candidates is not configured, the CIF value is 0, and an interval of starting CCE indexes of two neighboring PDCCH candidates of the plurality of PDCCH candidates is calculated by a value based on a number of the plurality of PDCCH candidates. In other aspects, a radio communication method for a terminal and a base station are also disclosed.