Fast Frequency Hopping Spectrum Sharing in Non-Terrestrial Networks
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Solution Overview
Problem
Existing non-terrestrial networks face challenges in frequency hopping to prevent eavesdropping and ensure stable tactical data transmission, particularly in military operational environments, due to the infeasibility of ultra-wideband spectrum hopping without secure frequency sharing among multiple communication entities.
Innovation Solution
A spectrum sharing method through fast frequency hopping (FFH) in non-terrestrial networks, where communication units identify occupied frequencies and adjust their hopping patterns to avoid collisions, using a processor to determine optimal frequency changes based on available frequencies and jamming probabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple communication units operate simultaneously in non-terrestrial networks using fixed frequency assignment, then frequency collision and interference occur, but implementing frequency hopping requires ultra-wideband spectrum which is not practically available
Solution Approach 1:
The patent implements dynamic frequency selection where communication units continuously monitor occupied frequencies and adapt their hopping patterns in real-time. Instead of using fixed frequency assignments or requiring ultra-wideband spectrum for frequency hopping, the system dynamically identifies available frequencies and adjusts hopping sequences based on current spectrum occupancy, enabling multiple units to share the spectrum without collision
Solution Approach 2:
The patent changes the hopping pattern parameters (frequency sequences, hopping rates, and time slots) based on detected spectrum occupancy. When frequency collisions are detected, the system modifies the hopping parameters to select alternative frequencies, transforming the static frequency assignment problem into a dynamic parameter optimization problem that resolves conflicts without requiring additional spectrum resources
2Object-affected harmful factors
If frequency hopping is implemented to prevent eavesdropping and jamming, then communication security improves, but frequency collision between multiple units increases without proper coordination
Solution Approach 1:
The patent incorporates feedback mechanisms where each communication unit monitors the spectrum environment, detects occupied frequencies, and reports this information to coordinate hopping patterns. This feedback loop enables units to adjust their frequency hopping sequences to avoid collisions while maintaining the security benefits of frequency hopping, as the system continuously adapts based on real-time spectrum occupancy information
Solution Approach 2:
The patent performs preliminary frequency identification and collision detection before completing frequency hopping sequences. By proactively identifying occupied frequencies and adjusting hopping patterns in advance, the system prevents frequency collisions before they occur, rather than reacting after collisions have happened, thus maintaining both security and collision-free operation
Data Source
AI summary
The present disclosure relates to a spectrum sharing method that can prevent jamming attacks and frequency interference through frequency hopping when operating multiple units simultaneously in a non-terrestrial network. The spectrum sharing method through frequency hopping according to an embodiment of the present disclosure is a spectrum sharing method through fast frequency hopping (FFH) in a plurality of cells assigned with different frequencies, the spectrum sharing method including: identifying occupied frequencies assigned to a cell at which a communication unit is positioned and at least one adjacent cell, respectively; and changing collision frequencies matching the occupied frequencies in a preset hopping pattern in the communication unit to a frequency that is not the occupied frequencies.