D2D Terminal Synchronization Source Switching
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Solution Overview
Problem
In wireless communication systems supporting device-to-device (D2D) communication, existing technologies face challenges in ensuring synchronization, particularly when the quality of synchronization reference signals fails to meet prescribed standards, leading to potential disruptions and inefficiencies.
Innovation Solution
A method for D2D UEs to perform synchronization by receiving a synchronization reference signal from a first source and switching to a second source if the quality falls below a threshold, using a processor to manage this process, with hysteresis levels and timers to ensure reliable synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single synchronization source is used, then the synchronization process is simple, but the reliability deteriorates when the source quality deteriorates
Solution Approach 1:
The patent combines multiple synchronization sources (first synchronization source and second synchronization source) into a unified synchronization system. The D2D UE can select between these sources based on quality metrics, ensuring continuous reliable synchronization even when one source deteriorates. This merging approach resolves the contradiction by providing redundancy without requiring completely separate synchronization systems.
Solution Approach 2:
The patent implements dynamic synchronization source selection where the D2D UE can switch between the first and second synchronization sources based on real-time quality assessment. The UE evaluates synchronization reference signal quality from multiple sources and dynamically selects the optimal source, transforming a static single-source system into a flexible multi-source system that adapts to changing conditions.
2Reliability
If synchronization source switching is implemented, then the reliability improves, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple synchronization sources (first and second synchronization sources) before switching is needed. The D2D UE is equipped with the capability to receive and evaluate synchronization reference signals from multiple sources in advance, so when quality deterioration occurs, the switching can be performed smoothly without complex real-time decision-making under stress.
Solution Approach 2:
The patent implements feedback mechanisms where the D2D UE continuously monitors the quality of synchronization reference signals from the current synchronization source. Based on this feedback, the UE determines whether to switch to an alternative source. This feedback-driven approach simplifies the switching logic compared to exhaustive evaluation methods, resolving the contradiction between reliability and complexity.
3Stability of the object's composition
If quality threshold checking is performed, then the synchronization stability improves, but the response time to quality deterioration increases
Solution Approach 1:
The patent utilizes parameter changes by evaluating multiple quality metrics (such as RSRP, RSRQ, SINR) of synchronization reference signals to determine when switching is necessary. By monitoring these parameters continuously and comparing them against thresholds, the system achieves both stability (through threshold-based decision making) and timely response (through continuous parameter monitoring). The patent may also adjust threshold values dynamically based on channel conditions.
Data Source
AI summary
Disclosed is a method for performing a synchronization by a device-to-device (D2D) terminal in a wireless communication system supporting D2D communication. More particularly, a method for performing a synchronization by a D2D terminal comprises the steps of: receiving a synchronization reference signal from a first synchronization source and performing a synchronization; and, if the quality of the synchronization reference signal does not meet a predetermined standard, changing the synchronization source into a second synchronization source.