Distributed Unit Dynamic Transmission Windows for Satellite Link Jitter
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The transmission delay and jitter in non-terrestrial networks cause buffer overflow and packet loss at the receiving terminal, disrupting the NR-Uu link in satellite communication systems.
Innovation Solution
A communication system and method that estimates distance information, converts it into transit time difference, and adjusts the transmission window accordingly to ensure packets arrive within the receiving window, mitigating buffer overflow and maintaining network continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission window is fixed, then the system structure is simple, but packet loss occurs due to transmission delay and jitter
Solution Approach 1:
The patent implements dynamic adjustment of the transmission window by the DU based on real-time distance information to transit time conversions. The window size and position are continuously adapted to match changing transmission conditions, transforming a static configuration into a dynamic system that responds to environmental changes, thereby resolving the contradiction between reliability and complexity.
Solution Approach 2:
The system establishes a feedback loop where the DU continuously monitors distance information, converts it to transit time differences, and uses this feedback to adjust the transmission window parameters. This closed-loop control mechanism ensures packets are transmitted with appropriate timing adjustments, improving delivery reliability while maintaining manageable system complexity through automated feedback-driven adaptation.
2Loss of time
If the transmission delay is reduced, then the packet arrival time is improved, but the buffer overflow problem worsens due to jitter
Solution Approach 1:
The patent changes the transmission window parameters (size and position) dynamically based on converted transit time differences. By adjusting these parameters in response to varying delay conditions, the system optimizes packet arrival timing while preventing buffer overflow, effectively resolving the contradiction between reducing transmission delay and preventing buffer overflow caused by jitter.
3Measurement precision
If the fronthaul interface is made delay-sensitive, then the packet timing precision is improved, but the network adaptability worsens when satellite distance changes
Solution Approach 1:
The system transforms the rigid, delay-sensitive fronthaul interface into a dynamic configuration where the transmission window is continuously adjusted based on satellite distance changes. This dynamic adaptation maintains precise packet timing while enabling the network to adapt to varying transmission conditions, resolving the contradiction between timing precision and network adaptability.
Data Source
AI summary
A communication system includes a distributed unit (DU). The DU estimates distance information, converts the distance information into a transit time difference, and adjusts a transmission window according to the transit time difference, in which start and end points of the transmission window move according to the transit time difference.