Synchronization Signal Block Subcarrier Mapping for Initial Access
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently transmitting synchronization signals, particularly in terms of cost reduction, increased service availability, flexible frequency use, and simplified structures, which are essential for future technological advancements.
Innovation Solution
A method and apparatus for transmitting a synchronization signal block in a wireless communication system, where a primary synchronization signal (PSS), secondary synchronization signal (SSS), and physical broadcasting channel (PBCH) are mapped to multiple symbols, with the PBCH mapped to more subcarriers than PSS and SSS, and DMRSs are arranged with equal intervals, ensuring efficient initial access by optimizing subcarrier spacing and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If synchronization signals (PSS, SSS, PBCH) are transmitted using traditional LTE methods, then system compatibility is maintained, but transmission efficiency and initial access speed are insufficient
Solution Approach 1:
The synchronization signal block is segmented into distinct components (PSS, SSS, PBCH) with specific mapping to different symbols. The PSS is mapped to one symbol, SSS to another symbol, and PBCH to multiple symbols, allowing parallel transmission and reducing total access time while maintaining efficiency
Solution Approach 2:
The synchronization signal block is prepared and mapped in advance with optimized subcarrier spacing and positioning. The PBCH is mapped to multiple symbols with DMRS arranged at equal intervals, enabling the UE to perform initial access more rapidly without waiting for sequential signal transmission
2Area of stationary object
If PBCH is mapped to more subcarriers than PSS and SSS, then spectral coverage is improved, but signal complexity increases
Solution Approach 1:
Different subcarrier mappings are applied to different signals based on their specific requirements. PSS and SSS use a subset of subcarriers optimized for synchronization, while PBCH uses additional subcarriers optimized for broadcast information, with DMRS placed at specific locations for channel estimation
Solution Approach 2:
The signal mapping transitions from a single-dimensional approach to a multi-dimensional arrangement where PSS, SSS, and PBCH are distributed across multiple symbols and subcarriers in a two-dimensional time-frequency grid, optimizing both spectral coverage and decoding efficiency
Data Source
AI summary
A method of transmitting a synchronization signal block, which is transmitted by a base station in a wireless communication system, is disclosed in the present invention. The method includes the steps of mapping a synchronization signal block including a PSS (primary synchronization signal), an SSS (secondary synchronization signal), and a PBCH (physical broadcasting channel) to a plurality of symbols, and transmitting the synchronization signal block mapped to a plurality of the symbols to a user equipment. In this case, in a symbol mapped the PSS, in a symbol mapped the SSS, and in a symbol mapped the PBCH, centers of subcarriers to which the PSS, the SSS, and the PBCH are mapped are the same and the number of subcarriers to which the PBCH is mapped is greater than the number of subcarriers to which the PSS and the SSS are mapped.