Satellite 5G NR System Information Blocks for Scheduling Timing Alignment
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Solution Overview
Problem
The challenge in satellite communication systems using 5G NR is the introduction of large timing advance (TA) due to long propagation distances and Doppler shifts, leading to latency issues and increased signaling overhead when configuring UE-specific scheduling offsets.
Innovation Solution
The method involves broadcasting a system information block (SIB) that includes multiple values of scheduling offsets (Koffset) and beam-related parameters, allowing UEs to determine appropriate timing relationships and reduce latency while minimizing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UE-specific scheduling offsets are configured for each satellite beam, then timing accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the scheduling offset configuration into beam-specific parameters (Koffset, Krap) that are individually configured for each satellite beam. This allows precise timing control per beam while managing signaling overhead through structured parameter organization in system information blocks.
Solution Approach 2:
Different timing offset parameters are applied locally to each satellite beam based on its specific propagation characteristics. Each beam receives customized Koffset and Krap values tailored to its distance and Doppler shift properties, achieving local timing optimization without uniformly increasing overhead across all beams.
2Adaptability or versatility
If multiple scheduling offset values are broadcasted, then adaptability to different satellite beams is improved, but system information block size increases
Solution Approach 1:
Multiple scheduling offset values are segmented into distinct parameter groups (Koffset, Krap, Kta) that can be independently configured and broadcast. This structured segmentation allows the system to provide comprehensive beam adaptability while controlling SIB size through efficient parameter organization and optional broadcasting of only necessary subsets.
Solution Approach 2:
The scheduled offset parameters serve multiple functions simultaneously: they provide timing adjustment for different satellite beams, compensate for Doppler shifts, and enable flexible resource allocation. This multi-functionality reduces the need for separate parameter sets, thereby controlling SIB size while maintaining broad adaptability.
3Reliability
If timing advance is increased to compensate for satellite propagation delay, then synchronization is improved, but latency increases
Solution Approach 1:
The patent applies preliminary timing advance compensation through configured Koffset and Krap parameters before actual data transmission occurs. By pre-adjusting the timing based on satellite distance and propagation characteristics, the system achieves synchronization without introducing additional latency during the communication process.
Solution Approach 2:
The system dynamically adjusts timing parameters (Koffset, Krap, Kta) based on satellite position, velocity, and propagation conditions. These parameter changes enable precise synchronization control that compensates for variable propagation delays while minimizing the timing advance applied, thereby reducing latency.
Data Source
AI summary
A system and method for system information transmission. The system and method include broadcasting, by a wireless communication node to a wireless communication device, a system information block that indicates configuration of different resources.