D2D Synchronization Reference Selection in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, there is a need for a method to select an appropriate synchronization reference for device-to-device (D2D) communication at user equipment (UE) to ensure efficient and accurate D2D communication, particularly in varying wireless channel environments.
Innovation Solution
A method where a UE detects a D2D synchronization signal, measures the D2D reference signal received through the same subframe, and selects a synchronization reference UE based on whether the measured signal satisfies a predetermined threshold, considering the information element of the D2D channel associated with the reference signal. This involves measuring the average received power of resources used for D2D demodulation reference signals and configuring the D2D synchronization signal and channel information accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If D2D synchronization signal selection is based only on signal strength, then the selection process is simple, but the reliability of D2D communication deteriorates in varying wireless channel environments
Solution Approach 1:
The patent changes the selection parameters from only signal strength to multiple parameters including signal strength, channel quality indicators, and information element acquisition status. This allows the system to adapt to varying wireless channel environments while maintaining reliable D2D communication.
Solution Approach 2:
The patent performs preliminary measurements of D2D reference signals and evaluates multiple selection criteria before finalizing the synchronization reference selection. This preliminary evaluation ensures that the selected reference is appropriate for the current channel environment, improving reliability.
2Measurement precision
If D2D reference signal measurement is performed to ensure accurate synchronization reference selection, then the selection accuracy is improved, but the complexity of the selection process increases
Solution Approach 1:
The patent performs measurements of D2D reference signals that are transmitted in the same subframe as the D2D synchronization signal. By measuring these readily available reference signals, the patent achieves accurate selection without requiring additional excessive measurement actions that would significantly increase complexity.
Solution Approach 2:
The patent uses measured channel quality indicators and signal strength information as feedback to determine the appropriate synchronization reference. This feedback mechanism enables accurate selection while keeping the process manageable through systematic evaluation of available measurements.
3Adaptability or versatility
If multiple selection criteria including information element acquisition are considered, then the adaptability to wireless channel environment is improved, but the device complexity increases
Solution Approach 1:
The patent introduces multiple selection parameters including signal strength, channel quality indicators, and information element acquisition status. These parameter changes enable the system to adapt to different wireless channel environments while maintaining a structured selection process that manages complexity.
Solution Approach 2:
The patent segments the selection process into distinct evaluation stages: signal strength measurement, channel quality assessment, and information element verification. This segmentation allows the system to systematically evaluate multiple criteria without overwhelming complexity.
Data Source
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AI summary
A method for performing a device-to-device (D2D) communication in a wireless communication system by a terminal, according to an embodiment of the present invention, comprises: a step for detecting a D2D synchronization signal from at least one synchronization source; a step of measuring a D2D reference signal received through the same subframe as that for the detected D2D synchronization signal; and a step of selecting synchronization reference UE from said at least one synchronization source according to whether a prescribed condition is satisfied, wherein said prescribed condition is satisfied if the measured result of the D2D reference signal satisfies a threshold value and an information element of a D2D channel linked with the D2D reference signal satisfying the threshold value is acquired.