Conditional Secondary Node Change for Low-Latency 5G Handover

The patent applies preliminary action by pre-configuring multiple candidate secondary nodes and their corresponding execution criteria before handover is needed. The UE receives conditional handover configuration information including candidate SCG configurations and execution criteria from the master node, preparing multiple potential target nodes in advance. When the execution criteria is met, the UE can immediately execute handover to the appropriate candidate node without delay, ensuring service continuity and reducing handover latency.

The patent applies self-service by enabling the UE to autonomously evaluate execution criteria and select appropriate candidate secondary nodes based on pre-configured conditions. The UE independently monitors whether the execution criteria for each candidate cell is met and autonomously executes handover to the suitable candidate node without requiring continuous network control, thereby reducing device complexity while maintaining service continuity and reliability.

The patent reduces signaling overhead by applying preliminary action - all necessary handover configuration information, including multiple candidate SCG configurations and execution criteria, is transmitted in advance from the master node to the UE before handover execution. This allows the UE to have all required information locally stored and ready, eliminating the need for extensive real-time signaling during actual handover execution, thus reducing both latency and signaling overhead.