NR V2X Sidelink Synchronization Signals With Reduced Ambiguity Peaks
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Solution Overview
Problem
Existing LTE V2X sidelink synchronization signals face issues with ambiguity peaks and poor cross-correlation properties, leading to challenges in robust and reliable synchronization for vehicle-to-everything (V2X) communication.
Innovation Solution
A novel design for NR V2X sidelink synchronization signals, including differentiated S-PSS and S-SSS sequences, time reversal mapping, and optimized S-SSB structure to enhance synchronization performance and reduce receiver complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LTE V2X sidelink synchronization signals are used, then device complexity is reduced, but synchronization accuracy and reliability deteriorate due to ambiguity peaks and poor cross-correlation properties
Solution Approach 1:
The patent changes the sequence parameters by introducing differentiated S-PSS and S-SSS sequences with specific cross-correlation properties. The S-PSS sequence uses a first set of parameters while S-SSS uses a second set, creating optimized correlation characteristics that eliminate ambiguity peaks and improve synchronization reliability without requiring complex receiver processing.
2Measurement precision
If differentiated S-PSS and S-SSS sequences are implemented, then synchronization accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the synchronization signal into distinct S-PSS and S-SSS components, each with specialized sequence parameters. This segmentation allows each component to be optimized independently for correlation properties, improving synchronization accuracy while maintaining manageable receiver complexity through structured signal design.
Solution Approach 2:
The patent employs sequence copying and differentiation techniques where S-PSS and S-SSS sequences are derived from standardized patterns with specific parameter variations. This copying approach enables improved synchronization accuracy through optimized correlation characteristics while avoiding the need for entirely new complex sequence generation mechanisms.
3Device complexity
If optimized S-SSB structure with maximum 11 PRBs is used, then receiver processing is simplified, but signal coverage area is reduced
Solution Approach 1:
The patent optimizes the S-SSB structure by setting the maximum PRB allocation to 11 PRBs and configuring appropriate subcarrier spacing values. This parameter optimization simplifies receiver processing by defining clear structural constraints while maintaining adequate signal coverage through efficient resource utilization and optimized signal distribution patterns.
Data Source
AI summary
Systems, apparatuses, methods, and computer-readable media are provided for a user equipment (UE) for a wireless communication system. The UE determines at least one sidelink primary synchronization signal (S-PSS) sequence of at least one S-PSS signal. The at least one S-PSS sequence is different from a primary synchronization signal (PSS) sequence. The UE also determines at least one sidelink secondary synchronization signal (S-SSS) sequence of at least one SSSS signal. The UE determines a plurality of S-PSS symbols and a plurality of SSSS symbols corresponding to a sub carrier spacing (SCS). The UE transmits to another UE the determined plurality of S-SSS symbols after the determined plurality of S-PSS symbols. The SCS may be associated with a physical resource block (PRE) allocation size. A maximum of 11 PRBs for a sidelink synchronization signal block (S-SSB) may be set based on the SCS.