Sidelink Primary Synchronization Signal Sequence Generation
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Solution Overview
Problem
The existing methods for transmitting synchronization signals in New Radio (NR) vehicle-to-everything (V2X) communication suffer from false alarms and false detections due to the use of new m-sequences, leading to reduced synchronization detection probability and increased synchronization delay.
Innovation Solution
The proposed method involves generating a Sidelink Primary Synchronization Signal (S-PSS) sequence based on specific polynomials, such as dPSS(n) = 1 - 2x(m), where x(m) is generated using polynomials like x(i+7) = (x(i+4) + x(i))mod 2, and transmitting the S-PSS on a frequency resource different from that occupied by the air-interface downlink-primary synchronization signal (DL-PSS).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a new m-sequence is employed for S-PSS, then synchronization signal transmission is enabled, but false alarms or false detections occur leading to reduced synchronization detection probability
Solution Approach 1:
The patent changes the fundamental parameters of the synchronization signal by using Zadoff-Zhu sequences with specific root indices instead of m-sequences. This parameter change in sequence type and generation method fundamentally alters the correlation properties, eliminating false detections while maintaining synchronization detection capability. The specific root indices are selected to ensure low cross-correlation with downlink synchronization signals.
Solution Approach 2:
The patent converts the potential harm of sequence correlation into a benefit by carefully selecting Zadoff-Zhu sequence parameters. The mathematical properties of Zadoff-Zhu sequences provide zero auto-correlation and low cross-correlation characteristics, which transform what would be a problematic correlation issue into a reliable synchronization mechanism that actively prevents false detections.
2Loss of time
If a new m-sequence is employed for S-PSS, then synchronization signal transmission is enabled, but synchronization delay increases
Solution Approach 1:
The patent changes the sequence generation parameters from m-sequences to Zadoff-Zhu sequences with specific root indices. This parameter change improves the detection probability, which directly reduces the time required for successful synchronization detection. The enhanced correlation properties enable faster and more reliable synchronization establishment.
3Device complexity
If S-PSS is transmitted on the same frequency resource as DL-PSS, then resource utilization is simplified, but correlation between sidelink and downlink synchronization signals increases
Solution Approach 1:
The patent changes the frequency resource parameter for S-PSS transmission, allocating it to different frequency resources than DL-PSS. This parameter separation in the frequency domain directly reduces the correlation between sidelink and downlink synchronization signals, preventing false detections while maintaining clear signal distinction.
Solution Approach 2:
The patent segments the frequency resources by assigning different frequency allocations to DL-PSS and S-PSS. This segmentation separates the downlink and sidelink synchronization signals in the frequency domain, eliminating interference and correlation issues while maintaining organized resource management.
Data Source
AI summary
A method of transmitting a synchronization signal, a terminal, an apparatus for transmitting a synchronization signal, and a storage medium are provided. The method includes: generating a sidelink-primary synchronization signal sequence according to a formula dPSS(n)=1−2x(m) or dPSS(n)=du(n), and generating a sidelink-primary synchronization signal according to the sidelink-primary synchronization signal sequence; transmitting the sidelink-primary synchronization signal; or transmitting the sidelink-primary synchronization signal on a frequency resource different from a frequency resource occupied by an air-interface downlink-primary synchronization signal.