Dynamic Satellite Interference Coordination via I/N Ratios
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Solution Overview
Problem
Current methods for coordinating non-geostationary satellite systems impose strict and inflexible operational constraints due to fixed topocentric angle thresholds, leading to unnecessary interference reduction and increased complexity in managing radio resources.
Innovation Solution
A method that dynamically determines triplets of limit values for angles and interference-to-noise ratios to adapt transmission power, allowing for a distribution of signal-to-noise and interference ratios that exceed a reference distribution, thereby optimizing operational constraints for each specific situation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed topocentric angle thresholds are imposed for coordination, then interference protection is ensured, but operational flexibility and system capacity are reduced
Solution Approach 1:
The patent applies dynamics by replacing fixed topocentric angle thresholds with dynamic, adaptable constraints. The coordination mechanism now determines constraints based on actual interference-to-noise ratios and signal-to-noise ratios in real-time, allowing the system to adapt to varying operational conditions while maintaining interference protection. This transforms the rigid angular separation requirement into a flexible power and ratio-based coordination approach.
Solution Approach 2:
The patent changes the coordination parameters from fixed angular thresholds to variable interference-to-noise ratio thresholds. By determining triplets of limit values (two angles and an interference-to-noise ratio) that satisfy distribution requirements, the system dynamically adjusts operational constraints based on actual signal conditions, thereby maintaining reliability while improving adaptability.
2Reliability
If strict operational constraints are applied to protect against interference, then link quality is maintained, but transmission capacity and system productivity are reduced
Solution Approach 1:
The patent applies partial action by determining interference-to-noise ratio limits that are sufficient to maintain acceptable link quality distributions rather than eliminating all interference. The coordination mechanism identifies the minimum necessary constraints (triplets of limit values) that satisfy the distribution requirement, allowing transmissions to proceed when interference levels are acceptable, thus maintaining link quality while preserving transmission capacity.
Solution Approach 2:
The patent changes from binary constraint application (either constrained or unconstrained) to continuous parameter adjustment based on interference-to-noise ratios. By determining limit values that satisfy distribution requirements, the system allows operational flexibility within acceptable quality bounds, thereby maintaining link quality while maximizing transmission capacity.
3Device complexity
If fixed angular constraints are imposed on satellite transmissions, then interference coordination is simplified, but the number of operational constraints to manage increases
Solution Approach 1:
The patent applies universality by creating a multi-functional coordination mechanism that determines triplets of limit values applicable to multiple satellite constellations and terrestrial stations. This universal approach replaces numerous constellation-specific angular constraints with a unified interference-to-noise ratio-based framework, simplifying the coordination mechanism while improving resource management efficiency across diverse systems.
Solution Approach 2:
The patent changes from managing multiple fixed angular constraints to managing dynamic interference-to-noise ratio parameters. By determining limit values based on actual signal conditions rather than predetermined angles, the coordination mechanism becomes more efficient, reducing the number of constraints to manage while maintaining effective interference coordination.
Data Source
AI summary
A method for determining operational constraints for a first constellation of non-geostationary satellites (CONS_I) transmitting towards a terrestrial station (SV) with respect to a second constellation of non-geostationary satellites (CONS_V) linked with the station, the constraints comprising a maximum transmission power of the satellites of the first constellation, the method includes determining triplets of limit values (θ, φ, I/N) of two angles (θ, φ) and of an interference-to-noise ratio (I/N), the angles (θ, φ) defining a position of a satellite (NGSO_I) of the first constellation relative to the station and to a satellite (NGSO_V) of the second constellation and the interference-to-noise ratio being the ratio between interferences (I) transmitted by the first constellation on a link between the station and the satellite of the second constellation and the noise (N) of the link, the determination of the triplets being performed so that a distribution of signal-to-noise and interference ratios (R) aggregated over a time interval is greater than a reference distribution (REF); determining at least the maximum transmission power of at least one satellite of the first constellation from the triplets.