D2D Synchronization via Offset Information and Reference Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In Device to Device (D2D) communication systems, existing synchronization methods rely on access to a synchronous base station or GPS, which can be unreliable, especially in areas without coverage, leading to difficulties in establishing synchronization and initiating D2D communication.
Innovation Solution
A method and apparatus for efficiently synchronizing devices in D2D communication systems by transmitting and receiving synchronization signals with offset information, allowing devices to match synchronization reference times and system frame numbers without relying on a synchronous base station or GPS, using a synchronization transmission device and a synchronization reception device to adjust and relay synchronization signals and channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronization is set up using a synchronous base station or GPS receiver module, then synchronization can be established reliably, but the device cannot operate in areas without base station coverage or GPS signal
Solution Approach 1:
The patent introduces a synchronization reference device as an intermediary between devices needing synchronization. Instead of directly relying on base stations or GPS, devices obtain synchronization information through this reference device, which can be any device in the network equipped with synchronization capabilities. This mediator enables synchronization in areas without base station coverage while maintaining reliability through the reference device mechanism
Solution Approach 2:
The patent enables devices to perform self-synchronization by selecting and following synchronization reference devices from within the D2D network itself. Devices autonomously identify suitable reference devices and adjust their timing based on received synchronization signals, without requiring external base station control. This self-service approach expands operational coverage to areas without infrastructure while maintaining synchronization reliability through peer-to-peer reference establishment
2Productivity
If devices directly exchange data via D2D link without going through eNB, then eNB overload is reduced and traffic capacity increases, but synchronization setup becomes more complex and unreliable
Solution Approach 1:
The synchronization reference device acts as an intermediary that simplifies the synchronization process for direct D2D communication. Instead of complex peer-to-peer synchronization negotiations, devices simply follow the reference device's synchronization signals, reducing the setup complexity while enabling direct data exchange that relieves eNB overload
Solution Approach 2:
Devices autonomously perform synchronization by independently selecting reference devices and adjusting their timing based on received signals. This self-service synchronization mechanism eliminates the need for complex eNB-coordinated setup procedures, reducing both device complexity and eNB processing requirements while maintaining reliable synchronization for direct communication
Data Source
AI summary
A method for performing synchronization by a device in a device to device (D2D) communication system is provided. The method includes transmitting a first synchronization signal, and transmitting offset information indicating a time difference between a synchronization reference time of the first synchronization signal and a transmission time of the first synchronization signal.