Backup SSB Selection for Low-Noise Cell Coverage
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Solution Overview
Problem
The coverage area of a cell in mobile communication systems is limited by the use of a single cell-defining synchronization signal block (CD-SSB), which restricts data transmission and reception quality due to noise interference.
Innovation Solution
A method and apparatus that enable a terminal device to determine a second synchronization signal block (SSB) as a backup for the first SSB, within a preset bandwidth or a specific frequency domain position difference, allowing combination of SSBs to improve signal-to-noise ratio and expand coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single cell-defining synchronization signal block (CD-SSB) is used for data transmission, then the system structure is simple, but the coverage area of the cell is limited and signal-to-noise ratio is insufficient
Solution Approach 1:
The patent segments the synchronization signal block function by introducing two distinct types: CD-SSB for cell definition and NCD-SSB for data transmission. This segmentation allows multiple NCD-SSBs to be deployed within a cell's coverage area without complicating the cell definition structure, thereby expanding coverage while maintaining systematic simplicity.
Solution Approach 2:
The NCD-SSB is designed with multi-functionality, serving both as a data transmission carrier and as a coverage extension mechanism. By making NCD-SSB universally applicable for data transmission across multiple frequency domain positions, the system expands coverage area without requiring additional cell definitions.
2Productivity
If multiple SSBs are supported in one frequency domain bandwidth, then coverage area can be expanded, but the system can support only one CD-SSB which limits data transmission
Solution Approach 1:
The patent segments SSB functions into CD-SSB (single instance for cell definition) and NCD-SSB (multiple instances for data transmission). This allows the system to support one CD-SSB while simultaneously supporting multiple NCD-SSBs for enhanced data transmission and coverage, resolving the limitation of single-SSB systems.
Solution Approach 2:
The patent introduces a new dimension by allowing NCD-SSBs to be positioned at multiple frequency domain locations (different GSCN values) while maintaining association with a single CD-SSB. This dimensional expansion in frequency domain enables multiple data transmission paths without creating multiple cells, thereby improving productivity and coverage simultaneously.
3Reliability
If a single SSB is used for synchronization, then the system is simple to operate, but the signal-to-noise ratio is low and transmission reliability is insufficient
Solution Approach 1:
The patent merges multiple NCD-SSBs associated with the same CD-SSB into a unified data transmission system. The terminal device operates simply by identifying one CD-SSB and then utilizing multiple associated NCD-SSBs for data transmission, combining their signals to improve signal-to-noise ratio and reliability without complicating the operation process.
Solution Approach 2:
The patent creates copies of the synchronization function through NCD-SSBs that are linked to the primary CD-SSB. These NCD-SSB copies enable redundant data transmission paths, improving reliability through signal combining while maintaining operational simplicity as the terminal still references the original CD-SSB for cell identification.
Data Source
AI summary
Embodiments of this application disclose a synchronization signal block determining method and a related apparatus. The method includes: A terminal device detects a first synchronization signal block (SSB); the terminal device determines a second SSB based on the first SSB, where a frequency domain position of the first SSB and a frequency domain position of the second SSB are within a preset bandwidth, or a difference between frequency domain positions of the first SSB and the second SSB is a preset value. The second SSB may be considered as a backup SSB for the first SSB.