5G User Terminal Synchronization via Adjustable Numerologies
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Solution Overview
Problem
Existing radio communication systems, such as LTE Rel. 8 to 12, face challenges in efficiently utilizing frequency spectrum and achieving low latency in next-generation communication systems, particularly when handling a large number of devices and high-frequency bands, leading to potential communication failures and reduced frequency usage efficiency.
Innovation Solution
The proposed solution involves a new radio communication method for 5G systems that uses a different radio frame and sub-frame structure with adjustable numerologies, including varying subcarrier spacing, symbol length, and system bandwidth, along with beam forming techniques for synchronization and reference signals to enhance communication efficiency and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing radio communication methods (LTE Rel. 8 to 12) are applied to next-generation systems, then system compatibility is maintained, but frequency usage efficiency deteriorates and communication delays increase
Solution Approach 1:
The patent introduces a new radio frame structure with configurable parameters including subcarrier spacing (15kHz or 30kHz), cyclic prefix lengths (normal and extended), and symbol durations that can be dynamically selected based on channel conditions and service requirements. This allows optimization for high-frequency bands and massive device connections while maintaining backward compatibility through parameter selection rather than structural overhaul
2Reliability
If existing radio communication methods (LTE Rel. 8 to 12) are applied to next-generation systems, then system compatibility is maintained, but communication delay increases
Solution Approach 1:
The patent implements dynamic parameter adjustment where the base station can switch between different subcarrier spacings (15kHz for coverage, 30kHz for capacity), cyclic prefix types (normal for AWGN channels, extended for multipath channels), and frame structures based on real-time channel conditions and service requirements. This dynamic adaptation reduces communication delay by selecting optimal parameters for each transmission scenario while maintaining compatibility with existing systems
3Productivity
If beam forming techniques are implemented, then synchronization efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the synchronization process into distinct phases: initial cell search using synchronization signals, beam identification using reference signals with beam-specific scrambling, and connection establishment. Each phase uses simplified processing appropriate to its purpose, with beam forming applied selectively rather than uniformly across all signal types, thereby improving synchronization efficiency while controlling device complexity
Data Source
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AI summary
It is one of the objects to achieve an appropriate communication in a next generation communication system. The user terminal according to one aspect of the present invention includes a receiving section that receives a synchronization signal and a transmitting section that uses a sequence and/or a radio resource determined based on the synchronization signal to transmit a random access preamble.