V2X Synchronization Signal Zero Insertion for Frequency Offset
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Solution Overview
Problem
Wireless communication systems face challenges in achieving synchronization in environments with significant frequency offset, particularly in vehicle-to-everything (V2X) communication, where high mobility and carrier frequency lead to difficulties in maintaining optimal synchronization performance.
Innovation Solution
A method is introduced to generate and transmit a synchronization signal by puncturing a sequence of length 63, inserting 0s between elements, and mapping it to resource elements, with the number of inserted 0s corresponding to the repetition factor minus one, which helps maintain symmetry and effectively handle high frequency errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional synchronization signal is used in V2X communication, then the system can operate with standard sequence mapping, but synchronization performance deteriorates in high frequency offset environments
Solution Approach 1:
The patent applies asymmetry by intentionally inserting zero values at specific positions within the synchronization sequence to create an asymmetric pattern that is optimized for frequency offset detection. The zero insertion creates a distinctive correlation pattern that enables receivers to accurately detect synchronization signals even when frequency offsets are present, transforming the harmful frequency offset into a detectable feature through asymmetric sequence design
Solution Approach 2:
The patent changes the parameters of the synchronization sequence by inserting zero values at specific positions, thereby modifying the sequence structure from a conventional continuous pattern to one with intentional gaps. This parameter change creates a sequence that is specifically designed to maintain correlation properties under frequency offset conditions, improving synchronization reliability in high mobility V2X environments
2Reliability
If synchronization signals are transmitted with high robustness to frequency offset, then synchronization detection improves, but sequence complexity and implementation complexity increase
Solution Approach 1:
The patent segments the synchronization sequence by inserting zero values that divide the continuous sequence into distinct segments. This segmentation creates a structured pattern where non-zero elements are separated by zero elements, enabling the receiver to detect synchronization through correlation at specific intervals. The segmentation approach maintains detection robustness while providing a systematic and implementable sequence structure
Solution Approach 2:
The patent uses a base sequence and creates modified versions by inserting zero values at predetermined positions. This copying approach allows the system to generate multiple synchronization sequences from a single base sequence, reducing the need to store and process entirely different sequences while maintaining the ability to detect synchronization under various frequency offset conditions
3Ease of manufacture
If standard sequence mapping is used, then implementation is straightforward, but the system cannot effectively handle wide subcarrier spacing required for high frequency offset compensation
Solution Approach 1:
The patent introduces dynamic adaptability by designing a sequence structure that can be configured with different zero insertion patterns depending on the subcarrier spacing and frequency offset conditions. The sequence mapping is made dynamic through configurable zero insertion positions and counts, allowing the system to adapt to different V2X operating scenarios while maintaining a unified implementation framework that builds upon standard mapping procedures
Data Source
AI summary
A method of transmitting a synchronization by a V-UE (vehicle user equipment) signal in a wireless communication system, includes generating a secondary synchronization signal for the V-UE, and transmitting the generated secondary synchronization signal for the V-UE only in subframe 5 among subframe 0 to subframe 9, wherein a secondary synchronization signal for a D2D (device-to-device) UE is transmitted only in the subframe 0 among the subframe 0 to the subframe 9.