D2D Synchronization Subframe With Frequency Stability Feedback
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Solution Overview
Problem
In device-to-device (D2D) communication, achieving synchronization is challenging due to frequency offset issues, particularly when UEs obtain synchronization from different sources or have varying stratum levels, leading to increased frequency offset and reduced synchronization stability.
Innovation Solution
A method where a subframe containing a D2D synchronization signal includes information on frequency stability, allowing UEs to estimate and match synchronization based on this information, which can be transmitted through a physical D2D synchronization channel, and adjust their reception periods or synchronization signal formats accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UEs obtain synchronization from different sources or have varying stratum levels, then D2D communication can operate with flexible synchronization sources, but frequency offset increases and synchronization stability deteriorates
Solution Approach 1:
The patent applies feedback by having the synchronization signal transmit frequency stability information about the reference UE back to other UEs. This feedback mechanism allows receiving UEs to adjust their synchronization parameters based on the actual frequency stability characteristics of the reference UE, thereby maintaining synchronization stability despite using different synchronization sources with varying stratum levels.
Solution Approach 2:
The patent changes the parameters of the synchronization signal by incorporating frequency stability information directly into the synchronization signal structure. This allows the system to adapt to different synchronization sources by modifying the signal parameters to include stability characteristics, enabling UEs to compensate for frequency offsets caused by different stratum levels while maintaining reliable synchronization.
2Reliability
If frequency stability information is included in the subframe, then frequency offset can be reduced and synchronization can be improved, but the subframe structure becomes more complex
Solution Approach 1:
The patent applies universality by making the synchronization signal serve multiple functions: it provides both time synchronization and frequency stability information simultaneously. By embedding frequency stability information into the existing synchronization signal structure rather than creating a separate signaling mechanism, the patent avoids increasing subframe structure complexity while still achieving frequency offset reduction and improved synchronization reliability.
Data Source
AI summary
One embodiment of the present invention relates to a method for a terminal attaining device-to-device (D2D) synchronization in a wireless communication system, the method comprising the steps of: receiving a sub-frame containing a D2D synchronization signal; and attaining time/frequency synchronization on the basis of the sub-frame, wherein if an apparatus for transmitting the D2D synchronization signal is a D2D terminal, then the sub-frame may include information regarding the frequency stability.