Terminal SSB Index Mapping for High-Frequency Beam Management
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Solution Overview
Problem
In high-frequency bands exceeding 52.6 GHz, existing technologies face challenges with increased phase noise, propagation loss, and sensitivity to peak-to-average power ratio (PAPR) and power amplifier nonlinearity, requiring a larger number of synchronization signal blocks (SSBs) to support a large number of beams, while maintaining efficient data scheduling and reducing power consumption.
Innovation Solution
A terminal capable of receiving synchronization signal blocks in different frequency bands, such as FR4, with an expanded SSB index range, uses a control unit to determine the transmission opportunity of a random access channel preamble based on the received SSBs, allowing for simultaneous transmission of multiple SSBs with different pseudo-co-location assumptions, and adjusts the mapping of SSBs to PRACH occasions using i mod M, where i is the SSB index and M is the number of SSBs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of SSBs is increased to support a large number of beams in high-frequency bands, then beam coverage is improved, but overhead related to SSB signaling increases
Solution Approach 1:
The patent combines multiple SSBs with different QCL assumptions into the same time-frequency resources. Specifically, multiple SSBs are transmitted simultaneously using the same time position or frequency position, thereby reducing signaling overhead while maintaining the ability to support multiple beams for comprehensive coverage.
Solution Approach 2:
The patent enables SSB resources to serve multiple functions by allowing different SSBs with different QCL assumptions to share the same resources. This multi-functionality approach allows the system to support beam diversity and multiple transmission scenarios without proportionally increasing the total resource allocation.
2Adaptability or versatility
If the number of SSBs is increased to support a large number of beams, then beam diversity is improved, but data scheduling delay increases
Solution Approach 1:
The patent merges multiple SSB detection processes by allowing simultaneous transmission of multiple SSBs in the same time-frequency resources. This reduces the time required for SSB detection and measurement, thereby decreasing data scheduling delay while maintaining beam diversity through different QCL assumptions.
3Adaptability or versatility
If the number of SSBs is increased to support a large number of beams, then coverage is improved, but power consumption increases
Solution Approach 1:
The patent combines multiple SSB transmissions into the same time-frequency resources by utilizing different QCL assumptions. This approach maintains comprehensive coverage through beam diversity while reducing the total number of separate SSB transmissions required, thereby lowering power consumption.
4Adaptability or versatility
If the SSB index range is expanded to support more beams, then beam capacity is improved, but mapping to PRACH occasions becomes complex
Solution Approach 1:
The patent changes the mapping parameter from direct SSB index mapping to modulo-based mapping (i mod M). This parameter transformation simplifies the mapping process by creating a cyclic pattern that automatically handles expanded SSB index ranges, reducing mapping complexity while maintaining expanded beam capacity.
Data Source
AI summary
A terminal receives a synchronization signal block (SSB) in a different frequency band different from the frequency band that includes one or a plurality of frequency ranges, and based on the synchronization signal block, determines a transmission opportunity of a preamble via a random access channel based on the synchronization signal block. The terminal receives the synchronization signal block with an expanded index range determines the transmission opportunity of the preamble via the random access channel based on i mod M where i is a synchronization signal block index and M is number of synchronization signal blocks.