Conditional Handover for Wireless Mobility Reliability
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining mobility reliability and minimizing latency, especially for advanced services like Augmented Reality (AR) and Virtual Reality (VR) that require ultra-reliability and low latency.
Innovation Solution
The proposed method involves a master node transmitting an addition request message to a target secondary node, receiving identification information of a target primary secondary cell, and then sending a secondary node change type message to the user equipment (UE) with mobility triggering conditions, allowing the UE to perform a handover to the target secondary node when specific conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedures are used, then the handover process is simple, but the interruption time is too long and reliability is insufficient for ultra-reliable low latency services
Solution Approach 1:
The patent implements conditional handover by pre-configuring multiple candidate target cells and their corresponding execution conditions before handover is needed. When mobility triggering conditions are met, the UE can immediately execute handover to a pre-selected target cell, eliminating the need for real-time target cell selection and reducing interruption time while maintaining high reliability
2Reliability
If conditional handover with multiple candidate cells is implemented, then mobility reliability and low latency are improved, but the device complexity increases
Solution Approach 1:
The patent enables the UE to autonomously evaluate mobility triggering conditions and select appropriate target cells based on pre-configured criteria. This self-service approach transfers the handover decision-making burden from the network to the UE, reducing network control complexity while maintaining the benefits of conditional handover for reliability and latency
Data Source
AI summary
Method, systems and devices for a master node which is accessed by a user equipment, UE, the UE accessed a source secondary node are provided. The method comprises transmitting, to the target secondary node, an addition request message, receiving, from the target secondary node, an addition request acknowledge message with identification information of a target primary secondary cell in response to the addition request message, determining at least one mobility triggering condition of the target primary secondary cell, and transmitting, to the UE, a secondary node change type message having the at least one mobility triggering condition of the target primary secondary cell, to make the UE perform a handover from the source secondary node to the target secondary node when determining the target primary secondary cell meets at least one of the at least one mobility condition.