Mobile communication system, MME, terminals and method for communication

A method of a User Equipment (UE) comprising:

• sending, to a mobility management node, a registration request message including first capability information indicating that the UE supports Cellular Internet of Things (CIoT) data transfer using a Control plane (C-plane);
• receiving from the mobility management node, a registration accept message including second capability information indicating that the mobility management node supports the CIoT data transfer using the C-plane;
• and
• after completion of a registration procedure, sending, to a base station, a Radio Resource Control (RRC) connection setup complete message including a Non-Access Stratum (NAS) message carrying data and further including third capability information indicating that the UE supports the CIoT data transfer using the C-plane.

A mobility management node comprising:

• a processor;
• and
• a memory having stored thereon a set of instructions executable by the processor, wherein upon execution of the instructions the processor causes the mobility management node to:
• receive, from a User Equipment (UE), a registration request message including first capability information indicating that the UC supports Cellular Internet of Things (CIoT) data transfer using a Control plane (C-plane);
• send, to the UE, a registration accept message including second capability information indicating that the mobility management node can support the CIoT data transfer using the C-plane;
• and
• after completion of a registration procedure, receive, from a base station, an Initial UE message including data wherein the base station receives, from the UE, a Radio Resource Control (RRC) connection setup complete message including a Non-Access Stratum (NAS) message carrying the data and further including the third capability information indicating that the UE supports the CIoT data transfer using the C-plane.

A method of a mobility management node comprising:

• receiving, from a UE (User Equipment), a registration request message including first capability information indicating that the UE supports Cellular Internet of Things (CIoT) data transfer using a Control Plane (C-plane);
• sending, to the UE, a registration accept message including second capability information indicating that the mobility management node supports the CIoT data transfer using the C-plane;
• and
• after completion of a registration procedure, receiving, from a base station, an Initial UE message including data wherein the base station receives, from the UE, a Radio Resource Control (RRC) connection setup complete message including a Non-Access Stratum (NAS) message carrying the data and further including third capability information indicating that the UE supports the CIoT data transfer using the C-plane.