Handover Threshold Control via Secondary RAT Spectral Efficiency
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Solution Overview
Problem
In dual-connectivity wireless communication systems, handover decisions between access nodes operating under different radio access technologies (RATs) often prioritize primary connections without considering the spectral efficiency of secondary connections, which can lead to suboptimal data transmission rates due to varying channel quality and spectral efficiency across different RATs.
Innovation Solution
A computing system compares the spectral efficiency of secondary RAT access nodes to control handover decisions, adjusting measurement thresholds for user equipment (UE) to favor access nodes with higher spectral efficiency, ensuring optimal data transmission by prioritizing connections with better spectral performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If handover decisions prioritize primary RAT connections without considering secondary RAT spectral efficiency, then handover control is simplified, but data transmission rate deteriorates due to suboptimal spectral efficiency
Solution Approach 1:
The patent modifies handover decision parameters by introducing spectral efficiency metrics from secondary RAT connections into the handover evaluation criteria. This involves changing the parameters considered in handover decisions from only primary RAT signal strength to include secondary RAT spectral efficiency, thereby optimizing data transmission rate while maintaining manageable complexity through structured parameter integration
2Productivity
If handover decisions consider spectral efficiency of secondary RAT connections, then data transmission rate is optimized, but handover control complexity increases
Solution Approach 1:
The patent segments the handover decision-making process into distinct evaluation stages: primary RAT signal strength assessment, secondary RAT spectral efficiency measurement, and combined metric calculation. This segmentation allows the system to consider multiple factors including secondary RAT performance while maintaining organized control logic and manageable complexity through structured decision layers
Solution Approach 2:
The patent introduces an intermediary evaluation mechanism that mediates between primary RAT connection stability and secondary RAT spectral efficiency. This intermediary layer processes both factors and produces a综合 handover recommendation, enabling optimized data transmission rate while preventing direct complexity conflicts between multiple decision criteria
3Productivity
If measurement thresholds are adjusted to favor high spectral efficiency access nodes, then spectral efficiency is optimized, but measurement precision requirements increase
Solution Approach 1:
The patent changes the measurement threshold parameters by incorporating spectral efficiency metrics into the threshold calculation formulae. This allows the system to optimize spectral efficiency through adaptive thresholds that account for secondary RAT performance while maintaining measurement precision through mathematically structured threshold adjustments rather than arbitrary changes
Data Source
AI summary
A method and system for controlling handover of a user equipment device (UE) in a system including RAT1 access nodes and RAT2 access nodes. An example method includes, while the UE is served with dual-connectivity cooperatively by a first RAT1 access node and a first RAT2 access node, (i) using a comparison between spectral efficiency of the first RAT2 access node and spectral efficiency of the second RAT2 access node as a basis to set a measurement threshold to be applied by the UE for evaluating coverage of a second RAT1 access node for possible handover of the UE from the first RAT1 access node to the second RAT1 access node, and (ii) causing the UE to apply the measurement threshold for evaluating the coverage of the second RAT1 access node for the possible handover of the UE from the first RAT1 access node to the second RAT1 access node.