Conditional Handover Sequencing for High-Speed Cell Transitions
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Solution Overview
Problem
High-speed mobility scenarios, such as in hyperloop systems, pose challenges for reliable user equipment (UE) handovers due to high speeds and small cell coverage areas, leading to inefficiencies and increased signaling overhead in existing Conditional Handover (CHO) techniques.
Innovation Solution
Enhancements to CHO by utilizing path information to proactively prepare candidate target cells and optimize data forwarding, reducing unnecessary signaling overhead and ensuring seamless handovers by indicating the order of CHO execution conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple candidate target cells are prepared in advance for Conditional Handover, then handover reliability is improved and radio link failures are reduced, but signaling overhead increases due to extensive preparation and coordination messages between network nodes
Solution Approach 1:
The patent applies preliminary action by preparing multiple candidate target cells in advance before handover is actually needed. The source network node identifies and prepares candidate target cells based on predicted UE movement paths, so that when handover becomes necessary, the UE can immediately connect to a pre-prepared target cell without extensive real-time signaling coordination.
Solution Approach 2:
The patent segments the handover process by dividing it into distinct phases: candidate cell identification, candidate cell preparation, and actual handover execution. This segmentation allows the network to prepare multiple candidate cells in advance during low-traffic periods, reducing the signaling burden during critical handover moments while maintaining high reliability.
2Reliability
If the UE stores the handover command and waits for condition satisfaction before executing handover, then handover timing is optimized and connectivity is maintained, but handover execution delay increases compared to immediate execution
Solution Approach 1:
The patent applies dynamics by making the handover execution timing adaptive rather than static. The UE dynamically evaluates whether to execute handover immediately or store the command based on real-time condition satisfaction. This dynamic approach allows the system to optimize between immediate execution (when conditions are favorable) and delayed execution (when conditions require waiting), thereby reducing overall handover execution delay while maintaining connectivity.
3Productivity
If path information is utilized to proactively prepare candidate target cells, then handover efficiency is improved and session continuity is ensured, but device complexity increases due to path prediction and proactive preparation mechanisms
Solution Approach 1:
The patent introduces an intermediary element in the form of a path prediction module that acts as a mediator between the UE movement patterns and the candidate target cell selection. This intermediary analyzes UE trajectory and predicts future positions, enabling proactive preparation of candidate cells without requiring complex real-time decision-making at the UE itself. The path prediction intermediary simplifies the overall system complexity by centralizing the analytical functions.
Data Source
AI summary
Methods, apparatuses, and computer program products provided herein improve upon conditional handover (CHO) techniques that handle continuous network connectivity when a user equipment (UE) moves between network cells. The disclosed techniques can be utilized in scenarios in which a path of a user equipment (UE) between 5 various network nodes is known, such as in a high-speed train use case. According to disclosed methods, a source network node triggers CHO preparation toward a plurality of target network nodes. A last prepared network node receives an indication to trigger further CHO preparation toward additional target network nodes. Since the path of the UE is known by the UE and/or in the network, the UE evaluates the CHO condition for 10 only the next target network node in the path. CHO techniques may therefore be enhanced by improving the efficiency of CHO according to the disclosed methods.