5G SSB Frequency Positioning and Raster Configuration
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Solution Overview
Problem
In 5G NR, the synchronization signal block (SSB) is not at the center of the channel bandwidth, requiring a different synchronization raster to improve UE operation for efficient SSB reception, as opposed to the equal handling of synchronization and channel rasters in existing LTE/LTE-A systems.
Innovation Solution
A method for determining frequency positions of multiple SSBs with a predetermined offset, positioning them 1.2 MHz apart on the frequency axis, and configuring the UE to receive at least one SSB, with the synchronization raster differing from the channel raster, including primary and secondary synchronization signals and physical broadcast channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the SSB is positioned at the center of channel bandwidth as in LTE, then the synchronization raster and channel raster can be equally handled, but in 5G NR the SSB is not at the center requiring different raster handling
Solution Approach 1:
The patent changes the frequency position parameter of the SSB from the channel bandwidth center (LTE) to a configurable offset position (5G NR). This allows the synchronization raster to be independently configured from the channel raster, providing flexibility in raster design while maintaining clear UE procedures through standardized offset values and raster spacing.
2Reliability
If multiple SSBs are positioned with predetermined offsets, then orthogonality between data and synchronization signals is maintained, but frequency positioning complexity increases
Solution Approach 1:
The patent segments the SSB positioning into discrete frequency locations defined by the synchronization raster, where multiple SSBs are placed at predetermined offset intervals (e.g., 100 kHz, 1.2 MHz). This segmentation ensures orthogonality between synchronization signals and data subcarriers while providing a manageable set of frequency positions for UE search and reception.
3Object-affected harmful factors
If the synchronization raster is aligned with data subcarrier, then inter-channel interference is avoided, but the synchronization raster must differ from channel raster
Solution Approach 1:
The patent introduces the synchronization raster as an intermediary frequency grid that mediates between the channel raster and the data subcarrier structure. By aligning the synchronization raster with data subcarrier boundaries through configurable offsets, it prevents inter-channel interference while maintaining a distinct raster structure for synchronization signal positioning.
Data Source
AI summary
One disclosure of this specification provides a method for receiving a synchronization signal block (SSB) by a user equipment (UE). The method may include: determining frequency locations of multiple SSBs; and receiving at least one SSB among the multiple SSBs. The multiple SSBs may be configured to be arranged spaced apart from each other by a predetermined offset. The at least one SSB may be located at an interval of 1.2 MHz on a frequency axis.