Sync Raster Ambiguity Resolution in 5G RMSI Reception
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Solution Overview
Problem
In 5G wireless communication systems, ambiguity in sync raster size can occur when multiple sync raster sizes coexist in the same frequency band, leading to inefficiencies in system information transmission and reception, particularly affecting user equipment (UE) operations during initial access and synchronization.
Innovation Solution
A method and apparatus that allow user equipment (UE) to determine the size of the sync raster by analyzing the synchronization signal/physical broadcast channel (SS/PBCH) block, using reserved bits, sequence, scrambling sequence, or demodulation reference signal (DMRS) mapping patterns, enabling accurate reception of remaining minimum system information (RMSI) and resolving sync raster size ambiguity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple sync raster sizes are defined in the same frequency band to support different 5G scenarios, then the system's adaptability and versatility are improved, but ambiguity occurs in determining the correct sync raster size, leading to inefficiencies in system information transmission and reception
Solution Approach 1:
The patent introduces an intermediary mechanism (sync raster indication information) that mediates between the multiple sync raster sizes and the UE. This indication information, carried in downlink messages from the network device, explicitly tells the UE which sync raster size to use, thereby resolving the ambiguity without limiting the system's ability to support multiple scenarios
Solution Approach 2:
The patent changes the parameter state by introducing dynamic sync raster indication information that can take different values to represent different sync raster sizes. This allows the system to adapt the sync raster size parameter based on the specific scenario and network conditions, resolving the ambiguity while maintaining versatility
2Reliability
If the UE attempts to detect RMSI on both 900 kHz and 1.44 MHz sync rasters to ensure coverage, then the reliability of system information reception is improved, but the complexity of the detection process and resource consumption increase
Solution Approach 1:
The patent applies preliminary action by having the network device provide sync raster indication information before the UE performs RMSI detection. This advance information allows the UE to directly detect RMSI on the correct sync raster without needing to attempt detection on multiple rasters, thereby maintaining reliability while reducing complexity
Solution Approach 2:
The patent implements feedback by using downlink messages from the network device to provide sync raster indication information back to the UE. This feedback mechanism guides the UE's detection process, ensuring it targets the correct sync raster and avoiding unnecessary detection attempts that would increase complexity
Data Source
AI summary
A method of receiving remaining minimum system information (RMSI) by a user equipment (UE) in a wireless communication system is disclosed. The method includes receiving a synchronization signal/physical broadcast channel (SS/PBCH) block in a specific band, obtaining a size of a synchronization raster for the specific band based on the SS/PBCH block, and receiving the RMSI based on the size of the synchronization raster.