D2D Synchronization Using Pulse-Coupled Oscillator Grouping
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Solution Overview
Problem
Current D2D communication systems face challenges in synchronization between devices, especially when they cannot access a synchronous evolved Node B or GPS, leading to incomplete synchronization and disrupted communication.
Innovation Solution
A method and apparatus that dynamically switch devices into groups for synchronization, using a Pulse-Coupled Oscillator (PCO) algorithm to output synchronization signals at specific times, applying time offsets based on group relations, enabling synchronization without relying on external time information sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If devices use time information from synchronous evolved Node B or GPS for synchronization, then synchronization accuracy is improved, but device accessibility and communication coverage are reduced
Solution Approach 1:
The patent introduces a mediator device that receives synchronization signals from external sources (evolved Node B or GPS) and redistributes them to other devices in the network. This intermediary approach allows devices in GPS-shaded areas or without direct access to synchronous evolved Node B to achieve synchronization indirectly through the mediator, thereby improving adaptability while maintaining synchronization accuracy.
Solution Approach 2:
The patent segments the synchronization network into multiple groups, where each group can independently establish synchronization relationships. This segmentation allows different devices to use different synchronization sources (some using GPS, others using evolved Node B, and some using intermediary devices), thereby improving overall system adaptability and coverage while maintaining synchronization accuracy within each segment.
2Adaptability or versatility
If devices perform D2D communication without access to synchronous evolved Node B or GPS, then communication coverage is improved, but synchronization reliability deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where devices continuously monitor synchronization signal quality and automatically adjust their synchronization sources. When direct access to synchronous evolved Node B or GPS is unavailable, devices can switch to using intermediary devices or other D2D devices as synchronization sources, thereby maintaining synchronization reliability while expanding communication coverage to GPS-shaded areas.
Solution Approach 2:
The patent enables dynamic switching between different synchronization sources (evolved Node B, GPS, intermediary devices, and other D2D devices) based on real-time availability and signal quality. This dynamic approach allows the system to adapt to changing environmental conditions, maintaining synchronization reliability whether devices have access to traditional sources or must rely on D2D-based synchronization.
3Productivity
If multiple devices transmit synchronization signals simultaneously, then communication capacity is improved, but signal convergence and synchronization precision worsen
Solution Approach 1:
The patent implements periodic transmission of synchronization signals at predetermined time intervals rather than continuous or simultaneous transmission. This periodic approach allows devices to transmit synchronization signals in organized cycles, reducing signal interference and collision while maintaining high communication capacity. The periodic structure enables reliable signal convergence and precise synchronization timing.
Solution Approach 2:
The patent establishes predetermined time offsets and transmission schedules for synchronization signals before actual D2D communication begins. This preliminary arrangement of signal transmission timing prevents simultaneous transmission conflicts, ensuring that synchronization signals from multiple devices converge properly without interference, thereby maintaining synchronization precision while supporting multiple active devices.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for robust synchronization between devices, even in areas with poor GPS reception or without access to a synchronous evolved Node B, enhancing communication reliability and capacity by dispersing synchronization signal reception and reducing errors.
Implementation Method 1
using a Pulse-Coupled Oscillator (PCO) algorithm to output synchronization signals at specific times, applying time offsets based on group relations
Data Source
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AI summary
A method performed by a device for performing synchronization between devices for a Device-to-Device (D2D) communication is provided. The method includes setting, according to a process of the device, the device to a group of devices for performing a dynamic switching; outputting a synchronization signal corresponding to the set group as a signal for setting synchronization in a physical layer; controlling, upon receiving another synchronization signal from another device, the outputting of the synchronization signal by applying a time offset according to a relation between the set group that includes the device and the group that includes the another device; and setting, if the synchronization signal and the another synchronization signal are converged, synchronization of the device based on a time point where the synchronization signal is output.