A radio terminal comprising: a transceiver; and at least one processor configured to control the transceiver when the radio terminal is located in one or more cells associated with a radio access network, RAN, wherein the at least one processor is configured to control state transitions of the radio terminal between Radio Resource Control, RRC, _Connected state, RRC_Inactive state and RRC_Idle state, the RRC_Connected state is a state in which the radio terminal and the RAN maintain an access stratum, AS, context and in which a location of the radio terminal is known to the RAN at cell level, the RRC_Inactive state is a state in which the radio terminal and the RAN maintain at least part of the AS context and in which the location of the radio terminal is known to the RAN at RAN notification area level configured by the RAN, the RRC_Idle state is a state in which the radio terminal and the RAN have released the AS context and in which the location of the radio terminal is not known to the RAN, the at least one processor is further configured to, if the radio terminal is in the RRC_Inactive state, if a current cell that the radio terminal has camped on is different from a first cell in which a state transition from the RRC_Connected state to the RRC_Inactive state was performed, and if the current cell satisfies a predetermined condition, transmit uplink data in the current cell without entering the RRC_Connected state, and the radio terminal is characterized in that the at least one processor is configured to: when the radio terminal is in the RRC_Inactive state, if the current cell is not included in the RAN notification area, and if an update procedure of the RAN notification area has not yet been performed, transmit RRC Resume Request message to the RAN; if the radio terminal is instructed in the update procedure by the RAN to remain in the RRC_Inactive state, transmit the uplink data after the update procedure while staying in the RRC_Inactive state without entering the RRC_Connected state; and if the radio terminal is instructed in the update procedure by the RAN to enter in the RRC_Connected state, transmit the uplink data after the update procedure and after transitioning from the RRC_Inactive state to the RRC_Connected state. a transceiver; and at least one processor configured to control the transceiver when the radio terminal is located in one or more cells associated with a radio access network, RAN, wherein the at least one processor is configured to control state transitions of the radio terminal between Radio Resource Control, RRC, _Connected state, RRC_Inactive state and RRC_Idle state, the RRC_Connected state is a state in which the radio terminal and the RAN maintain an access stratum, AS, context and in which a location of the radio terminal is known to the RAN at cell level, the RRC_Inactive state is a state in which the radio terminal and the RAN maintain at least part of the AS context and in which the location of the radio terminal is known to the RAN at RAN notification area level configured by the RAN, the RRC_Idle state is a state in which the radio terminal and the RAN have released the AS context and in which the location of the radio terminal is not known to the RAN, the at least one processor is further configured to, if the radio terminal is in the RRC_Inactive state, if a current cell that the radio terminal has camped on is different from a first cell in which a state transition from the RRC_Connected state to the RRC_Inactive state was performed, and if the current cell satisfies a predetermined condition, transmit uplink data in the current cell without entering the RRC_Connected state, and the radio terminal is characterized in that the at least one processor is configured to: when the radio terminal is in the RRC_Inactive state, if the current cell is not included in the RAN notification area, and if an update procedure of the RAN notification area has not yet been performed, transmit RRC Resume Request message to the RAN; if the radio terminal is instructed in the update procedure by the RAN to remain in the RRC_Inactive state, transmit the uplink data after the update procedure while staying in the RRC_Inactive state without entering the RRC_Connected state; and if the radio terminal is instructed in the update procedure by the RAN to enter in the RRC_Connected state, transmit the uplink data after the update procedure and after transitioning from the RRC_Inactive state to the RRC_Connected state. when the radio terminal is in the RRC_Inactive state, if the current cell is not included in the RAN notification area, and if an update procedure of the RAN notification area has not yet been performed, transmit RRC Resume Request message to the RAN; if the radio terminal is instructed in the update procedure by the RAN to remain in the RRC_Inactive state, transmit the uplink data after the update procedure while staying in the RRC_Inactive state without entering the RRC_Connected state; and if the radio terminal is instructed in the update procedure by the RAN to enter in the RRC_Connected state, transmit the uplink data after the update procedure and after transitioning from the RRC_Inactive state to the RRC_Connected state.