D2D Synchronization Signal Selection Using Quality Metrics
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Solution Overview
Problem
In device-to-device (D2D) communication, existing methods lack an efficient method for measuring user equipment and selecting a synchronization signal, which affects the synchronization process and overall communication efficiency.
Innovation Solution
A method for measuring user equipment in D2D communication that involves calculating the D2D synchronization signal reception quality (DSSRQ) and reception power (DSSRP) to select an optimal synchronization signal, allowing UEs to synchronize effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If D2D UEs perform measurement and select synchronization signal without efficient methods, then synchronization process becomes inefficient, but implementing measurement and selection methods increases system complexity
Solution Approach 1:
The patent applies preliminary action by having UEs perform measurements on synchronization signals from multiple source UEs before selecting a synchronization source. The measuring unit calculates D2D synchronization signal reception quality (DSSRQ) and reception power (DSSRP) in advance, allowing the selecting unit to choose the optimal synchronization source based on pre-collected measurement data, thereby improving synchronization efficiency without requiring complex real-time decision mechanisms
Solution Approach 2:
The patent replaces complex mechanical selection mechanisms with signal quality-based selection. Instead of using complicated algorithms or multiple criteria for synchronization source selection, the system substitutes this with a streamlined approach where UEs automatically select synchronization sources based on measured DSSRQ and DSSRP values, simplifying the selection mechanism while maintaining reliability
2Measurement precision
If D2D UEs use existing synchronization methods without measurement, then system complexity is reduced, but synchronization accuracy and communication efficiency deteriorate
Solution Approach 1:
The patent applies self-service by enabling UEs to autonomously perform measurements and select synchronization sources without network assistance or complex external coordination. Each UE independently measures DSSRQ and DSSRP of received synchronization signals and autonomously selects the best synchronization source, achieving high measurement precision through self-powered measurement mechanisms without requiring additional network infrastructure
Solution Approach 2:
The patent uses parameter changes by introducing two key measurement parameters - D2D synchronization signal reception quality (DSSRQ) and reception power (DSSRP). These parameters are calculated from received synchronization signals and used to dynamically select synchronization sources. By changing from static synchronization assignment to dynamic parameter-based selection, the system achieves higher synchronization accuracy while keeping the measurement mechanism relatively simple
Data Source
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Figure 2
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AI summary
Disclosed is a method for acquiring a synchronization by a device to device (D2D) terminal in a wireless communication system, according to an embodiment of the present invention, the method comprising the steps of: measuring D2D synchronization signal reception power and/or D2D synchronization signal reception quality from a D2D synchronization signal; selecting a D2D synchronization signal to be used for synchronization acquisition on the basis of the measurement result; and acquiring a synchronization from the selected D2D synchronization signal, wherein the D2D synchronization signal reception quality is a value obtained by dividing the D2D synchronization signal reception power by the differential between total reception power and the D2D synchronization signal reception power.