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 among first to third Radio Resource Control, RRC, states, the first RRC 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 second RRC 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 third RRC 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 second RRC 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 first RRC state to the second RRC state was performed, and if the current cell satisfies a predetermined condition, allow the radio terminal to transmit data to be transmitted in the current cell by a first transmission procedure in which the radio terminal transmits uplink data before entering the first RRC state, and the radio terminal is characterized in that the at least one processor is configured to: if the radio terminal is in the second RRC 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, allow the radio terminal to perform the update procedure with the RAN; if the radio terminal is instructed by the RAN to remain in the second RRC state in the update procedure, allow the radio terminal to transmit the data by the first transmission procedure; and if the radio terminal is instructed by the RAN to enter in the first RRC state in the update procedure, allow the radio terminal to transmit the data by a second transmission procedure in which the radio terminal is configured to transmit the uplink data after transitioning from the second RRC state to the first RRC 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 among first to third Radio Resource Control, RRC, states, the first RRC 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 second RRC 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 third RRC 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 second RRC 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 first RRC state to the second RRC state was performed, and if the current cell satisfies a predetermined condition, allow the radio terminal to transmit data to be transmitted in the current cell by a first transmission procedure in which the radio terminal transmits uplink data before entering the first RRC state, and the radio terminal is characterized in that the at least one processor is configured to: if the radio terminal is in the second RRC 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, allow the radio terminal to perform the update procedure with the RAN; if the radio terminal is instructed by the RAN to remain in the second RRC state in the update procedure, allow the radio terminal to transmit the data by the first transmission procedure; and if the radio terminal is instructed by the RAN to enter in the first RRC state in the update procedure, allow the radio terminal to transmit the data by a second transmission procedure in which the radio terminal is configured to transmit the uplink data after transitioning from the second RRC state to the first RRC state. if the radio terminal is in the second RRC 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, allow the radio terminal to perform the update procedure with the RAN; if the radio terminal is instructed by the RAN to remain in the second RRC state in the update procedure, allow the radio terminal to transmit the data by the first transmission procedure; and if the radio terminal is instructed by the RAN to enter in the first RRC state in the update procedure, allow the radio terminal to transmit the data by a second transmission procedure in which the radio terminal is configured to transmit the uplink data after transitioning from the second RRC state to the first RRC state.