Satellite Network Time Synchronization for Delay Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge of maintaining efficient and interference-free communication in wireless networks with non-stationary satellite base stations arises from the varying distances and relative movements between satellites and end-user equipment, causing timing discrepancies and interference, particularly in time-division duplex systems.
Innovation Solution
Computing time compensation values to adjust transmission schedules and apply these values to satellite base stations and end-user equipment to synchronize communication, using methods such as cyclic prefix adjustments and clock synchronization to compensate for propagation delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If non-stationary satellite base stations are used to provide wide coverage, then the coverage area is improved, but timing discrepancies and interference occur due to varying distances and relative movements
Solution Approach 1:
The system performs preliminary actions by computing time compensation values in advance based on predicted satellite positions and user locations. Transmission schedules are pre-calculated with built-in time adjustments, and cyclic prefix lengths are predetermined based on expected propagation delays. This allows the system to proactively compensate for timing issues before they occur, maintaining communication reliability across wide coverage areas.
Solution Approach 2:
The system dynamically changes parameters including time compensation values, cyclic prefix lengths, and transmission timing based on real-time satellite positions and user locations. By adjusting these parameters adaptively, the system maintains synchronized communication despite varying distances and relative movements between non-stationary satellites and ground users.
2Object-generated harmful factors
If time compensation values are computed and applied to synchronize transmissions, then interference is reduced, but system complexity increases
Solution Approach 1:
The system introduces time compensation values as an intermediary mechanism to mediate between satellite transmissions and user receptions. These compensation values act as a buffer that absorbs timing discrepancies caused by propagation delays, allowing asynchronous satellite transmissions to appear synchronized at the user end without requiring complex real-time coordination protocols.
Solution Approach 2:
Time compensation values are computed in advance based on orbital mechanics and geometric relationships, rather than being calculated in real-time during communication. This preliminary computation simplifies the system architecture by moving the complex calculation burden to a pre-processing stage, leaving only simple application of predetermined values during actual communication.
3Reliability
If transmission schedules are adjusted based on time compensation values, then synchronized communication is achieved, but transmission efficiency decreases
Solution Approach 1:
The system employs dynamic transmission scheduling where time compensation values and cyclic prefix lengths are adapted based on current satellite-user geometry. Rather than using fixed conservative timing margins, the system dynamically optimizes parameters for each transmission opportunity, maximizing resource utilization while maintaining synchronization. This allows efficient packing of transmissions without causing interference.
Data Source
AI summary
In one embodiment, a method includes computing time compensation values to compensate for propagation distance delays between at least one non-stationary satellite base station and end-user equipment, and causing at least part of a satellite-based wireless network to operate according to the computed time compensation values.