Apparatus, system, and method for mobile communication

A UE (User Equipment) in a mobile communication system, the UE comprising:

• a controller configured to control a transceiver;
• and
• the transceiver configured to attach to a second network node for mobility management, and receive small data via the second network node using a secure connection from a first network node that is connected to a SCS (Service Capability Server) and establishes the secure connection, wherein
• the first network node sends a release connection message to the second network node which deletes information on the small data when the first network node determines a release of the secure connection between the first network node and the second network node.

A method of a mobile communication system, the method comprising:

• attaching, by a UE (User Equipment), to a second network node for mobility management;
• establishing, by a first network node that is connected to a SCS (Service Capability Server), a secure connection;
• and
• sending small data, by the first network node, to the UE via the second network node using the secure connection, wherein
• the first network node sends a release connection message to the second network node which deletes information on the small data when the first network node determines a release of the secure connection between the first network node and the second network node.

A method of a first network node that is connected to a SCS (Service Capability Server) in a mobile communication system, the method comprising:

• establishing a secure connection;
• sending small data via a second network node using the secure connection to a UE (User Equipment) which attaches to the second network node;
• and
• sending a release connection message to the second network node which deletes information on the small data when the first network node determines a release of the secure connection between the first network node and the second network node.

A method of a UE (User Equipment) in a mobile communication system, the method comprising:

• attaching to a second network node for mobility management;
• and
• receiving small data via the second network node using a secure connection from a first network node that is connected to a SCS (Service Capability Server) and establishes the secure connection, wherein
• the first network node sends a release connection message to the second network node which deletes information on the small data when the first network node determines a release of the secure connection between the first network node and the second network node.