A radio terminal , comprising: a radio transceiver ; and at least one processor coupled to the radio transceiver and configured to operate as a non-access stratum, NAS, layer providing mobility management and session management and as an access stratum, AS, layer providing radio resource control, the AS layer including a Radio Resource Control, RRC, layer , wherein the radio transceiver is adapted to receive Application specific Congestion control for Data Communication, ACDC, control information and a mapping rule broadcast by an eNB , the ACDC control information comprising one or more ACDC categories and barring information per ACDC category, the mapping rule defining mapping between the one or more ACDC categories in the ACDC control information and ACDC categories provisioned in the radio terminal the NAS layer is adapted to: determine , based on ACDC configuration information provisioned in the radio terminal , an ACDC category to which an application that triggers a session establishment belongs; and pass the determined ACDC category to the AS layer, and the AS layer is adapted to: if the determined ACDC category received from the NAS layer is not presented in the ACDC control information broadcast by the eNB , select a substitute ACDC category in accordance with the mapping rule; and control whether to allow an access attempt based on the barring information per ACDC category corresponding to the substitute ACDC category. a radio transceiver ; and at least one processor coupled to the radio transceiver and configured to operate as a non-access stratum, NAS, layer providing mobility management and session management and as an access stratum, AS, layer providing radio resource control, the AS layer including a Radio Resource Control, RRC, layer , wherein the radio transceiver is adapted to receive Application specific Congestion control for Data Communication, ACDC, control information and a mapping rule broadcast by an eNB , the ACDC control information comprising one or more ACDC categories and barring information per ACDC category, the mapping rule defining mapping between the one or more ACDC categories in the ACDC control information and ACDC categories provisioned in the radio terminal the NAS layer is adapted to: determine , based on ACDC configuration information provisioned in the radio terminal , an ACDC category to which an application that triggers a session establishment belongs; and pass the determined ACDC category to the AS layer, and determine , based on ACDC configuration information provisioned in the radio terminal , an ACDC category to which an application that triggers a session establishment belongs; and pass the determined ACDC category to the AS layer, and the AS layer is adapted to: if the determined ACDC category received from the NAS layer is not presented in the ACDC control information broadcast by the eNB , select a substitute ACDC category in accordance with the mapping rule; and control whether to allow an access attempt based on the barring information per ACDC category corresponding to the substitute ACDC category. if the determined ACDC category received from the NAS layer is not presented in the ACDC control information broadcast by the eNB , select a substitute ACDC category in accordance with the mapping rule; and control whether to allow an access attempt based on the barring information per ACDC category corresponding to the substitute ACDC category. <EOS>