Nested Conditional Handover Configuration for Low-Overhead Mobility
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Solution Overview
Problem
Conditional mobility approaches in New Radio (NR) systems, while improving mobility robustness, can increase signaling overhead and delay mobility, particularly in multi-connectivity scenarios.
Innovation Solution
Implementing a nested conditional configuration where a wireless device applies both outer and inner conditional configurations only upon fulfillment of both the outer and inner trigger conditions, reducing signaling overhead and delay through a single control message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conditional mobility approach is implemented, then mobility robustness is improved, but signaling overhead increases
Solution Approach 1:
The configuration is segmented into outer conditional configuration and inner conditional configuration. The outer configuration contains conditional configurations for multiple target cells, while each inner configuration contains specific measurement and execution conditions. This segmentation allows the device to process only relevant inner configurations when outer conditions are met, reducing overall signaling overhead.
Solution Approach 2:
The patent implements nested conditional configuration where inner conditional configurations are embedded within outer conditional configurations. The outer configuration specifies target cells and basic parameters, while inner configurations nest additional conditions and measurement requirements. This nested structure enables hierarchical processing where devices only evaluate inner configurations when outer conditions are satisfied, optimizing signaling efficiency.
2Reliability
If conditional mobility approach is implemented, then mobility robustness is improved, but mobility delay increases
Solution Approach 1:
The network pre-configures conditional mobility parameters including multiple target cells, measurement conditions, and execution thresholds before the device needs to perform handover. This preliminary configuration allows the device to immediately execute handover when conditions are met without waiting for additional network signaling, thereby reducing mobility delay while maintaining robustness.
Solution Approach 2:
The conditional configuration enables dynamic handover execution based on real-time radio conditions. The device continuously monitors measurement conditions against configured thresholds and dynamically triggers handover to different target cells based on current network state, optimizing both robustness and timing flexibility.
3Measurement precision
If inner conditional configuration is continuously monitored, then mobility accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies local quality by making the monitoring of inner conditional configurations conditional upon the satisfaction of outer trigger conditions. Instead of continuously monitoring all inner configurations, the device only activates monitoring for inner configurations associated with target cells whose outer conditions are met. This selective monitoring reduces processing complexity while maintaining measurement accuracy for relevant targets.
Data Source
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AI summary
A wireless device (16) receives a control message (26) that indicates a nested conditional configuration (28). The nested conditional configuration (28)includes an outer conditional configuration (28-1) and an inner conditional configuration (28-2). The wireless device (16) is to apply the outer conditional configuration (28-1) if the wireless device (16) detects fulfillment of an outer trigger condition. The wireless device (16) is to apply the inner conditional configuration (28-2) if the wireless device (16) detects fulfillment of both the outer trigger condition and an inner trigger condition.