Synchronization Signal Subcarrier Spacing for 5G Numerology Adaptation
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Solution Overview
Problem
Future radio communication systems, such as 5G and NR, face challenges in transmitting and receiving synchronization signals when using numerologies different from those of legacy LTE systems, leading to potential signal transmission issues and decreased communication quality.
Innovation Solution
A user terminal equipped with a reception section for receiving synchronization signals mapped on predetermined resources and a control section that manages synchronization processing based on these signals, with varying subcarrier spacings for the first and second synchronization signals, allowing for enhanced frequency offset tolerance and improved detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If legacy LTE control methods are used for synchronization signals with different numerologies, then device complexity is reduced, but signal transmission reliability deteriorates
Solution Approach 1:
The patent applies parameter changes by introducing different subcarrier spacings for different types of synchronization signals. Specifically, the primary synchronization signal uses a first subcarrier spacing while the secondary synchronization signal uses a second subcarrier spacing, allowing the system to adapt to different numerologies and maintain reliable signal transmission in 5G/NR environments with flexible frame configurations.
2Adaptability or versatility
If different numerologies are used for synchronization signals, then system adaptability is improved, but signal detection precision worsens
Solution Approach 1:
The patent applies local quality by assigning different subcarrier spacings to different synchronization signals based on their specific requirements. The primary synchronization signal uses one subcarrier spacing optimized for initial detection, while the secondary synchronization signal uses another subcarrier spacing optimized for its specific function, allowing each signal to be detected with high precision despite using different numerologies.
Data Source
AI summary
Even when different numerologies from those of legacy LTE systems are used, synchronization signals are appropriately transmitted and/or received. A user terminal includes: a reception section that receives a first synchronization signal and a second synchronization signal mapped on predetermined resources; and a control section that controls synchronization processing based on the first synchronization signal and the second synchronization signal, and spacings of the first synchronization signal and the second synchronization signal at which the first synchronization signal and the second synchronization signal are mapped on subcarriers are different.