It is possible to provide a radio communication base station device, a radio communication terminal device, and a radio communication method which reduce a signaling load and perform flexible gap allocation. A target gap length generation unit (120) uses gap parameter configuration information acquired from a gap parameter generation unit (110) to subtract a gap offset from a maximum permissible gap length so as to calculate a minimum gap length. Moreover, when a new gap offset is reported from a network, a target gap length generation unit (120) re-calculates the minimum gap length according to the maximum permissible gap length which can be used.