Synchronization Signal Subcarrier Spacing Detection in 5G Initial Access
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Solution Overview
Problem
In 5G wireless communication systems, terminals face challenges in efficiently detecting subcarrier spacings during initial access, which affects the efficiency of initial access processes and increases complexity and time required for terminal implementation.
Innovation Solution
A method and device where a base station generates and transmits a synchronization signal based on the subcarrier spacing, allowing terminals to detect the subcarrier spacing used by the system, enabling efficient initial access and resource allocation for various services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple subcarrier spacings are supported in one 5G system to provide various services, then service versatility and system adaptability are improved, but terminal complexity and initial access time increase because terminals cannot know the subcarrier spacing used during initial access
Solution Approach 1:
The patent introduces a synchronization signal as an intermediary carrier that conveys subcarrier spacing information from the base station to the terminal. This mediator resolves the information asymmetry during initial access, allowing terminals to efficiently determine the system's subcarrier spacing without increasing their complexity or access time.
Solution Approach 2:
The base station performs preliminary action by transmitting synchronization signals containing subcarrier spacing information before the terminal attempts initial access. This advance provision of critical system parameters enables terminals to quickly configure themselves appropriately without trial-and-error approaches.
2Productivity
If terminals detect subcarrier spacing through synchronization signals, then initial access efficiency is improved, but system complexity increases due to the need for generating and transmitting multiple synchronization signals with different subcarrier spacings
Solution Approach 1:
The synchronization signal is designed with multi-functionality, serving both as a timing reference and as a carrier of subcarrier spacing information. This universal approach allows a single signal structure to accomplish multiple tasks, avoiding the need for separate signaling mechanisms and reducing overall base station complexity despite supporting multiple subcarrier spacings.
Solution Approach 2:
The patent utilizes parameter changes in the synchronization signal's time-domain repeat pattern to encode different subcarrier spacing values. By varying this observable parameter, the base station can indicate different subcarrier spacings without changing the fundamental signal structure, thereby managing complexity while providing versatile service support.
3Adaptability or versatility
If synchronization signals are transmitted with different subcarrier spacings, then forward compatibility for future services is improved, but the time and resources required for terminal detection and access increase
Solution Approach 1:
The synchronization signal employs periodic repetition patterns in the time domain, where the repeat period encodes subcarrier spacing information. This periodic structure allows terminals to efficiently detect the signal and determine subcarrier spacing through correlation-based methods, reducing detection time while maintaining forward compatibility through standardized signal designs that can accommodate future service requirements.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present invention is a method by which a base station transmits a signal in a wireless communication system for efficiently performing an initial access procedure of a terminal, the method comprising the steps of: generating the synchronization signal on a basis of subcarrier spacing used in the synchronization signal; and transmitting the synchronization signal to the terminal.