A terminal is disclosed including a receiver that receives a measurement instruction that indicates an inter-frequency measurement in a second carrier that is different from a first carrier of a serving cell; and a processor that assumes that frame boundaries of a plurality of cells on the second carrier are aligned, when information indicating whether an index of a synchronization signal block (SSB) transmitted by a neighboring cell can be derived based on a timing of the serving cell or a cell of a target frequency is included in the measurement instruction. In other aspects, a radio communication method of a terminal and a base station are also disclosed.