D2D Synchronization Signal Reselection via Power Threshold Comparison
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently selecting and reselecting synchronization signals in device-to-device (D2D) communication, particularly in managing increased mobile traffic and improving communication performance beyond initial synchronization conditions.
Innovation Solution
A method and device for reselecting synchronization signals in a wireless communication system supporting D2D direct communication, involving the comparison of reception power levels with threshold values and prioritization to optimize synchronization signal selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If initial synchronization signal selection is performed without reselection, then device complexity is reduced, but communication performance deteriorates under changing traffic conditions
Solution Approach 1:
The patent implements dynamic synchronization signal reselection by allowing UEs to periodically evaluate and switch between synchronization signals based on current reception conditions. The system transitions from static initial synchronization to dynamic reselection, where UEs can switch to alternative synchronization signals when traffic conditions change, thereby maintaining communication performance without excessive complexity increase through defined reselection criteria and thresholds.
Solution Approach 2:
The patent changes the parameter of synchronization signal selection by introducing reselection mechanisms that evaluate reception power levels, traffic conditions, and signal quality metrics. UEs can change their selected synchronization signal parameter based on measured conditions, allowing the system to adapt to varying traffic loads and maintain optimal communication performance without requiring complete system redesign.
2Reliability
If synchronization signal reselection with strict threshold comparison is implemented, then communication performance is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by introducing specific threshold parameters (e.g., reception power thresholds, signal quality thresholds) that govern synchronization signal reselection. UEs compare measured parameters against these thresholds to determine when reselection should occur, achieving accurate synchronization decisions through parameter-based criteria rather than complex algorithms, thus improving synchronization accuracy while controlling device complexity.
Solution Approach 2:
The patent implements feedback mechanisms where UEs continuously monitor reception power levels and signal quality of synchronization signals, compare these measurements against threshold parameters, and make reselection decisions based on the feedback. This closed-loop approach ensures accurate synchronization by continuously adapting to changing conditions while maintaining manageable device complexity through standardized feedback evaluation procedures.
3Productivity
If D2D communication is introduced to distribute traffic, then base station load is reduced, but synchronization management difficulty increases
Solution Approach 1:
The patent applies segmentation by dividing the synchronization management function into independent UE-level operations. Each UE independently performs synchronization signal measurement, threshold comparison, and reselection decisions without requiring centralized coordination for each action. This segmentation of synchronization management across multiple UEs enables D2D traffic distribution while reducing overall synchronization management difficulty through decentralized, autonomous UE behavior.
Solution Approach 2:
The patent implements self-service mechanisms where UEs autonomously perform synchronization signal selection and reselection based on their own measurements of reception power and signal quality. Each UE independently evaluates synchronization conditions and makes reselection decisions without requiring continuous base station intervention, thereby enabling traffic distribution across D2D links while reducing synchronization management difficulty through self-sufficient UE operations.
Data Source
AI summary
The present invention relates to a method and a device for reselecting a synchronization signal in a wireless communication system supporting device-to-device direct communication and the method includes: receiving a first synchronization signal from a second UE and receiving a second synchronization signal from a third UE; comparing a first reception power level indicating reception power of the first synchronization signal and a second reception power level indicating the reception power of a second synchronization signal with a first threshold value indicating minimum reception power; and selecting the first synchronization signal or the second synchronization signal according to the comparison result, and the synchronization signal is a synchronization signal selected in the previously synchronization procedure.