PBCH Information Mapping for NR High-Frequency Initial Access
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Solution Overview
Problem
The challenge in the New Radio (NR) system is determining the meaning of information transmitted in the Physical Broadcast Channel (PBCH) and System Information Block 1 (SIB1) during initial access procedures, particularly in high frequency ranges where SSB transmission may require multiple candidate positions and new subcarrier spacing, necessitating further research and discussion.
Innovation Solution
An information determination method and apparatus that sends Synchronization Signal Blocks (SSBs) via a first frequency band, allowing terminal devices to determine information used in initial access procedures based on high frequency bands, including subcarrier spacing, subcarrier offset indication, and QCL hypothesis indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SSB transmission is performed on unlicensed spectrum at high frequency, then multiple candidate positions are required to enable Listen Before Talk (LBT) success, but this increases the complexity of determining PBCH information meaning and initial access procedure parameters
Solution Approach 1:
The patent applies parameter changes by introducing frequency-range-specific parameters to differentiate PBCH information meaning across different frequency ranges. Specifically, it uses the higherFrequencyRangeIndicator parameter to indicate whether the cell operates in FR1 or FR2, and the subcarrierOffset parameter to indicate the subcarrier offset for PDSCH in initial access. These parameter changes allow the terminal to correctly interpret PBCH information based on the detected frequency range, resolving the complexity issue while maintaining LBT functionality on unlicensed spectrum.
2Productivity
If new subcarrier spacing is introduced in high frequency for SSB or SIB1 transmission, then initial access procedure efficiency is improved, but the difficulty of detecting and measuring PBCH information increases
Solution Approach 1:
The patent introduces new parameters specifically for high frequency operation: subcarrierOffset to indicate the subcarrier offset for PDSCH in initial access, and higherFrequencyRangeIndicator to distinguish between FR1 and FR2. These parameters enable the terminal to correctly detect and measure PBCH information by providing frequency-range-specific configuration, thereby improving initial access efficiency while reducing detection difficulty through explicit parameter indication.
3Reliability
If multiple SSB candidate positions are used in high frequency, then coverage and access reliability are improved, but the quantity of information that needs to be determined by the terminal increases
Solution Approach 1:
The patent applies universality by creating a unified parameter structure that works across both FR1 and FR2. The subcarrierOffset parameter and higherFrequencyRangeIndicator together provide a universal mechanism that handles both frequency ranges with a single parameter set, rather than requiring separate information sets for each frequency range. This reduces the total information quantity the terminal must process while maintaining access reliability through multiple SSB candidate positions.
Data Source
AI summary
Provided are an information determination method and apparatus. The information determination method includes: based on a first frequency range, determining information used by the terminal device in an initial access procedure.