Handling radio link failure in a narrow bandwidth internet of things control plane

A method of operating a user equipment, UE, comprising:

• establishing a radio resource control, RRC, connection with a base station;
• following establishment of the RRC connection, sending an indication of a security capability of the UE to the base station;
• receiving a non-access stratum, NAS, message, from the base station, wherein the NAS message identifies a selected security algorithm;
• and
• generating the access stratum security key to be used with the selected security algorithm.

A UE comprising:

• a transceiver;
• at least one processor coupled to the transceiver;
• and
• at least one memory coupled to the at least one processor and storing program code that when executed by the at least one processor causes the at least one processor to perform operations comprising:
• establishing a radio resource control, RRC, connection with a base station;
• following establishment of the RRC connection, sending an indication of a security capability of the UE to the base station;
• receiving a non-access stratum, NAS, message, from the base station, wherein the NAS message identifies a selected security algorithm;
• and
• generating the access stratum security key to be used with the selected security algorithm.

A method of operating a network node of a cellular radio access network, RAN, the method comprising:

• establishing a radio resource control, RRC, connection with a user equipment, UE;
• following establishment of the RRC connection, receiving an indication of a security capability of the UE from the UE;
• generating a list of security algorithms supported by the network node;
• transmitting the list of supported security algorithms to a core network node;
• receiving, from the core network node, a selected security algorithm;
• and
• sending the selected security algorithm to the UE.

A network node comprising:

• a transceiver;
• at least one processor coupled to the transceiver;
• and
• at least one memory coupled to the at least one processor and storing program code that when executed by the at least one processor causes the at least one processor to perform operations comprising:
• establishing a radio resource control, RRC, connection with a user equipment, UE;
• following establishment of the RRC connection, receiving an indication of a security capability of the UE from the UE;
• generating a list of security algorithms supported by the network node;
• transmitting the list of supported security algorithms to a core network node;
• receiving, from the core network node, a selected security algorithm;
• and
• sending the selected security algorithm to the UE.