Radio terminal, base station, and method therefor

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, wherein
• the radio transceiver is adapted to receive from an eNB, System Information Block (SIB) comprising Application specific Congestion control for Data Communication (ACDC) control information per Public Land Mobile Network (PLMN), the ACDC control information comprising at least one ACDC category and barring information per ACDC category,
• the NAS layer is adapted to:
• determine, based on ACDC configuration information, an ACDC category to which an application that triggers a session establishment belongs;
• and
• pass the determined ACDC category to the AS layer,
• the AS layer is adapted to:
• select a lowest ACDC category in the ACDC control information if the determined ACDC category is not presented in the ACDC control information;
• and
• control whether to allow an access attempt based on barring information corresponding to the lowest ACDC category.

A method in a radio terminal, the method comprising:

• receiving, by a transceiver, from an eNB, System Information Block (SIB) comprising Application specific Congestion control for Data Communication (ACDC) control information per Public Land Mobile Network (PLMN), the ACDC control information comprising at least one ACDC category and barring information per ACDC category;
• determining, by a non-access stratum (NAS) layer, based on ACDC configuration information, an ACDC category to which an application that triggers a session establishment belongs;
• passing the determined ACDC category from the NAS layer to an access stratum (AS) layer;
• selecting by the AS layer a lowest ACDC category in the ACDC control information if the determined ACDC category is not presented in the ACDC control information;
• and
• controlling, by the AS layer, whether to allow an access attempt triggered by the NAS layer based on barring information corresponding to the lowest ACDC category.

An eNB comprising:

• a radio transceiver configured to communicate with a radio terminal located within a cell;
• and
• at least one processor coupled to the radio transceiver and configured to broadcast, in the cell, System Information Block (SIB) comprising Application specific Congestion control for Data Communication (ACDC) control information per Public Land Mobile Network (PLMN), the ACDC control information comprising at least one ACDC category and barring information per ACDC category,
• wherein the ACDC control information is used by an access stratum (AS) layer of the radio terminal to select a lowest ACDC category in the ACDC control information if an ACDC category determined by the radio terminal is not presented in the ACDC control information.

A method in an eNB, the method comprising:

• a radio transceiver configured to communicate with a radio terminal located within a cell;
• and
• at least one processor coupled to the radio transceiver and configured to
• broadcasting, in a cell, System Information Block (SIB) comprising Application specific Congestion control for Data Communication (ACDC) control information per Public Land Mobile Network (PLMN), the ACDC control information comprising at least one ACDC category and barring information per ACDC category,
• wherein the ACDC control information is used by an access stratum (AS) layer of a radio terminal to select a lowest ACDC category in the ACDC control information if an ACDC category determined by the radio terminal is not presented in the ACDC control information.