TDMA Mesh Satellite Network Synchronization via Timing Error Reversal
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Solution Overview
Problem
Current satellite communication networks face limitations in providing network synchronization between terminals in a time division multiple access (TDMA)-based mesh network satellite communication system, particularly due to distance constraints that restrict the correctability of delay errors, limiting the range of mesh network communication.
Innovation Solution
The method involves receiving timing error information from a central station, generating a mesh superframe start time (SST') by reversing the sign of the timing error, and using this SST' to transmit and receive traffic information between terminals, allowing for network synchronization without the need for auxiliary devices like GPS, even at increased distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals are placed within a limited distance range to ensure correctable delay errors by the central station, then timing synchronization can be maintained, but the communication range is restricted
Solution Approach 1:
The patent introduces an intermediary timing error correction mechanism where the central station calculates timing errors for each terminal based on their respective superframe start times, then provides correction values to enable terminals to adjust their timing independently. This mediator approach allows terminals at various distances to maintain synchronization without being constrained by the original distance limitation.
Solution Approach 2:
The patent changes the timing parameter dynamically by calculating specific timing error values for each terminal based on their distance and transmission characteristics. Each terminal adjusts its superframe start time by adding or subtracting the calculated timing error, enabling flexible adaptation to different transmission distances while maintaining network synchronization.
2Measurement precision
If auxiliary devices like GPS are used for network synchronization, then timing accuracy is improved, but system complexity and cost increase
Solution Approach 1:
The patent implements a self-service synchronization mechanism where each terminal independently calculates its own timing error based on the superframe start time information received from the central station. The central station computes timing errors for each terminal and provides correction values, enabling the system to self-correct timing deviations without external auxiliary devices like GPS, thereby reducing system complexity and cost.
Data Source
AI summary
Disclosed is a network synchronization apparatus and method of a time division multiple access (TDMA)-based mesh network satellite communication system, the network synchronization method of a terminal in a satellite communication system including receiving timing error information from a central station, generating a mesh superframe start time (SST′) by reversing a sign of the timing error information, and receiving traffic information transmitted by a transmission terminal using the mesh SST′.