Terminal Mobility Control via Session Identification Parameters

The patent applies parameter changes by introducing identification information parameters (first and second identification information) in the session establishment accept message. These parameters indicate whether the core network includes handover function and whether the terminal is allowed to initiate handover, respectively. By changing the state of these parameters, the system can support multiple mobility types (network-initiated, terminal-initiated, or neither) without requiring complex procedural changes, thus resolving the contradiction between adaptability and device complexity.

The patent applies preliminary action by including identification information about core network handover capability in the session establishment accept message during the initial attach procedure. This allows the terminal to know in advance whether the core network includes handover function, enabling the terminal to prepare appropriate handover procedures beforehand. This preliminary information exchange improves reliability by ensuring both sides are aware of handover capabilities before actual handover occurs, while avoiding the need for complex real-time capability negotiation.

The patent applies self-service by enabling the terminal to autonomously initiate handover procedures when the second identification information indicates permission is granted. The terminal can independently determine when handover is needed based on its mobility state and initiate the procedure without complex network control, improving productivity by reducing handover initiation delay. The identification information acts as a simple permission flag that the terminal uses to make autonomous decisions, avoiding the need for complex handover control logic in both terminal and network.