SSB-to-PDSCH Signaling for SIB1 Outside NR Sync Raster
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Solution Overview
Problem
The existing NR system does not support operation on unlicensed frequency bands, and terminal equipment cannot receive SIB1 from synchronization signals not located on synchronization rasters, which are required for cell selection and reselection in advanced NR systems.
Innovation Solution
A method and apparatus for transmitting a synchronization signal/physical broadcast channel block not on a synchronization raster, associated with a control resource set to schedule a physical downlink shared channel for carrying remaining minimum system information, enabling terminal equipment to receive this information despite the signal's location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the synchronization signal is located on a predefined synchronization raster, then the terminal equipment can easily acquire system information, but the NR system cannot support operation on unlicensed frequency bands
Solution Approach 1:
The patent introduces dynamic indication information in the PBCH to convey the frequency domain position of the synchronization signal relative to the synchronization raster. This allows the system to adapt between fixed raster positioning and flexible positioning scenarios, enabling support for unlicensed bands while maintaining terminal equipment capability to handle both cases
Solution Approach 2:
The patent uses indication information as an intermediary mechanism between the synchronization signal and the terminal equipment. This indication information carries the relative frequency domain position, allowing the terminal to locate the PDSCH carrying SIB1 without requiring the synchronization signal to be on a predefined raster, thus enabling unlicensed band operation
2Adaptability or versatility
If the synchronization signal is not located on a synchronization raster, then the NR system can operate on unlicensed frequency bands, but the terminal equipment cannot receive SIB1 for cell selection and reselection
Solution Approach 1:
The patent shifts from direct raster-based positioning to a two-dimensional positioning approach: first locating the synchronization signal frequency, then using indication information to determine the offset to the synchronization raster, and finally using another offset to locate the PDSCH. This dimensional transformation enables SIB1 reception without requiring the synchronization signal to be on a predefined raster
Solution Approach 2:
The patent introduces indication information as an intermediary that bridges the gap between the synchronization signal position and the SIB1 delivery mechanism. This intermediary carries the necessary positioning information to enable terminal equipment to receive SIB1 even when the synchronization signal is not on a standard raster, preventing information loss
3Ease of operation
If the terminal equipment uses predefined synchronization raster for signal acquisition, then the acquisition process is simple, but the system cannot support advanced features requiring signals outside predefined rasters
Solution Approach 1:
The patent makes the synchronization system dynamic by introducing configurable indication information in the PBCH. The terminal equipment can operate in a simplified mode using predefined rasters when available, or switch to the flexible indication-based mode when unlicensed bands or advanced features are required, thus maintaining ease of operation while enabling adaptability
Data Source
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Figure 1C~2
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AI summary
Embodiments of this disclosure provide a method and apparatus for transmitting a signal and a communication system. The apparatus includes a first transmitting unit, the first transmitting unit being configured to: receive a first synchronization signal/physical broadcast channel block (SS/PBCH block, SSB), the first synchronization signal/physical broadcast channel block being not located on a first synchronization raster; and receive physical downlink control channel (PDCCH), the physical downlink control channel (PDCCH) being used to schedule a physical downlink shared channel (PDSCH) for carrying remaining minimum system information/system information block 1 (RMSI/SIB 1).