D2D Synchronization Source Selection Using Signal Power Thresholds
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Solution Overview
Problem
Device-to-device (D2D) synchronization in wireless communication systems faces challenges such as timing misalignment and confusion when multiple synchronization sources are present, particularly for UEs outside the network coverage, leading to unreliable network timing and potential communication disruptions.
Innovation Solution
A D2D synchronization method that involves detecting synchronization signals from multiple sources, selecting a synchronization source based on power thresholds and relative distance, and determining whether to forward timing information or act as an independent synchronization source, ensuring reliable network timing alignment and minimizing timing confusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a D2D device receives multiple synchronization signals simultaneously, then the device can potentially synchronize with different sources, but timing misalignment and confusion occur when the wrong device is selected
Solution Approach 1:
The patent changes the parameter of synchronization signal power level to determine the selection criterion. The UE compares the power levels of received synchronization signals from different sources and selects the source with the highest power, thereby resolving the timing alignment reliability issue while maintaining selection flexibility
Solution Approach 2:
The patent applies different selection criteria based on the local situation - whether the UE is in network coverage or out of coverage. When in coverage, the UE prioritizes network synchronization signals; when out of coverage, it selects from peer device signals, thus resolving the contradiction between adaptability and reliability
2Ease of operation
If a D2D device blindly searches for another device in asynchronous communication, then device autonomy is improved, but timing confusion increases due to lack of network coordination
Solution Approach 1:
The patent implements preliminary action by having the UE perform power level comparison and synchronization source selection before establishing D2D communication. This preliminary evaluation ensures that the device autonomously selects the most reliable timing reference, maintaining both device autonomy and timing reference consistency
3Area of stationary object
If D2D UEs outside network coverage select peer devices as synchronization sources, then communication range is extended, but timing confusion increases due to multiple different timing references
Solution Approach 1:
The patent uses power level as a selection parameter to choose the best peer device synchronization source. By selecting the peer device with the strongest signal, the UE extends communication range to out-of-coverage areas while minimizing timing confusion through consistent selection criteria
Solution Approach 2:
The patent implements feedback mechanisms where UEs monitor the quality and consistency of received synchronization signals. This feedback allows the system to adaptively maintain timing reference reliability even when operating outside network coverage with multiple potential sources
Data Source
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AI summary
The present disclosure provides a device to device (D2D) synchronization method that is applicable to a user equipment and a user equipment (UE) using the same method. In one of the exemplary embodiments, the D2D synchronization method includes receiving detected signals from a receiver, obtaining from the detected signals a first signal having a first timing information and a second signal having a second timing information, determining whether to forward the first timing information or the second timing information based on an upper bound power restriction of the first signal and the second signal and a power difference between the first signal and the second signal, and determining whether to transmit a third timing information that is inherent of the UE based on whether the first signal and the second signal are below power thresholds.