Synchronization Block Selection for Long-Distance Wireless Links
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Solution Overview
Problem
Wireless communication channels in long-distance scenarios, such as air-to-ground communications, face challenges due to terrain, altitude, velocity, large inter-site distances, interference, and dynamic Doppler effects, which degrade connection quality and require improved synchronization methods.
Innovation Solution
Transmission of multiple synchronization signal blocks (SSBs) with different numerologies and waveforms, allowing user equipment to select and decode the appropriate SSB for establishing a reliable connection with the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple synchronization signal blocks with different numerologies and waveforms are transmitted, then adaptability to varying propagation conditions is improved, but device complexity increases
Solution Approach 1:
The synchronization signal block is segmented into multiple versions with different numerologies and waveforms. Each segment (SSB) is optimized for specific propagation conditions, allowing the system to transmit diverse synchronization signals that can be selectively received based on channel characteristics without requiring the entire system to handle all complexity simultaneously.
Solution Approach 2:
The base station is designed with multi-functionality to transmit multiple types of synchronization signal blocks with different numerologies and waveforms. This universal capability allows the system to adapt to various propagation conditions (line-of-sair, non-line-of-sight, different velocities) using a single multi-functional transmission mechanism rather than separate specialized systems.
2Reliability
If multiple synchronization signal blocks with different numerologies are transmitted, then communication reliability in long-distance scenarios is improved, but loss of information increases
Solution Approach 1:
Different synchronization signal blocks are transmitted with locally optimized qualities suited for specific propagation conditions. SSBs with different numerologies (subcarrier spacings, cyclic prefix lengths) are tailored for specific scenarios (e.g., larger SCS for high velocity, extended CP for long delay spread), ensuring each local transmission condition receives the most appropriate signal characteristics to minimize information loss.
3Adaptability or versatility
If synchronization signal blocks with different waveforms are transmitted, then adaptability to terrain and velocity conditions is improved, but ease of operation decreases
Solution Approach 1:
The system dynamically selects and transmits synchronization signal blocks with different waveforms (CP-OFDM, DFT-s-OFDM) based on current propagation conditions including terrain characteristics and UE velocity. This dynamic adaptation allows the system to optimize performance for each specific scenario while maintaining operational simplicity through automated selection rather than manual configuration.
Data Source
AI summary
Aspects of the present disclosure include methods, apparatuses, and computer readable media for receiving a synchronization signal block (SSB) burst set having a plurality of SSBs that are time division multiplexed, wherein a first SSB of the plurality of SSBs and a second SSB of the plurality of SSBs have different numerologies or different waveforms, selecting a SSB of the plurality of SSBs, identifying cell information associated with a cell based on the SSB of the plurality of SSBs, and establishing a connection with the cell based on the cell information.