Adaptive D2D Synchronization Signal Configuration for Frequency Offset
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving signals during D2D communication due to performance degradation caused by frequency offset and the need for low latency, particularly in scenarios like V2V communication where frequency offsets can be significant.
Innovation Solution
The method involves adaptively changing the physical format of synchronization signals and demodulation reference signals based on the wireless communication environment, using additional synchronization symbols with different Zadoff-Chu sequences and configuring the number of DMRS symbols in a subframe to enhance robustness against frequency offset and meet latency requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional synchronization symbols with different Zadoff-Chu sequences are introduced to compensate for frequency offset, then robustness against frequency offset is improved, but device complexity increases
Solution Approach 1:
The patent changes the parameters of synchronization signals by introducing multiple Zadoff-Chu sequences with different root indices (e.g., first, second, third root indices) and configuring them in specific patterns within subframes. This allows the system to adapt to different frequency offset conditions by selecting appropriate sequences and configurations, thereby improving robustness while managing complexity through parameter variation rather than structural overhaul
Solution Approach 2:
The synchronization signal is segmented into multiple parts with different Zadoff-Chu sequences arranged in specific patterns (e.g., first pattern, second pattern) within subframes. This segmentation allows the receiver to process different segments with different frequency offset characteristics independently, improving overall robustness while enabling selective processing that manages device complexity
2Reliability
If the number of DMRS symbols is increased to improve channel estimation accuracy, then signal reception reliability is improved, but latency increases
Solution Approach 1:
The patent applies partial action by configuring a specific number of DMRS symbols (e.g., 2 or 3 symbols) rather than using the maximum available symbols. This partial configuration provides sufficient channel estimation accuracy for D2D communication while avoiding the excessive latency that would result from using more symbols, thus resolving the contradiction between reliability and time loss
3Reliability
If synchronization signals are transmitted with higher power to overcome frequency offset effects, then signal robustness is improved, but energy consumption increases
Solution Approach 1:
Instead of uniformly increasing transmission power, the patent changes the parameter configuration of synchronization signals by using multiple Zadoff-Chu sequences with different root indices and configuring them in specific patterns. This parameter-based approach provides frequency offset robustness through signal structure rather than power increase, thereby maintaining signal robustness while avoiding excessive energy consumption
Data Source
AI summary
A method for receiving a signal through a physical format adaptable to a wireless communication environment by a device supporting D2D communication according to an embodiment of the present invention comprises the steps of: receiving a synchronization signal from a transmission node on the basis of one of a first physical format and a second physical format; and performing synchronization with the transmission node on the basis of the synchronization signal, wherein when the second physical format is used, M synchronization symbols in addition to N synchronization symbols used in the first physical format are set in the same sub-frame, and a total of (N+M) synchronization symbols included in the same sub-frame may include a first synchronization symbol to which a first Zadoff-Chu sequence generated through first root indexes is mapped, and a second synchronization symbol to which a second Zadoff-Chu sequence generated through second root indexes is mapped.