Satellite Exclusion Zones for Terrestrial Interference Mitigation
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Solution Overview
Problem
Existing satellite-based networking technologies face challenges in managing interference between low earth orbit (LEO) satellite constellations and terrestrial networks, particularly in preventing unintended satellite broadcasts into prohibited geographic areas and sensitive transmission/radiation areas.
Innovation Solution
The implementation of satellite vehicle (SV)-based exclusion zones and device-based exclusion zones to control and restrict satellite spot beams and user equipment (UE) access, respectively, ensuring compliance with regulatory and service provider policies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If satellite spot beams are transmitted over geographic areas, then network coverage and connectivity are improved, but interference with terrestrial networks and unintended broadcasts into prohibited areas occur
Solution Approach 1:
The patent divides the geographic coverage area into multiple exclusion zones with different interference risk levels. Satellite spot beams are selectively enabled or disabled based on which exclusion zone they overlap with, allowing partial coverage in some areas while providing complete avoidance in others. This segmentation enables the system to maintain network coverage in safe areas while preventing interference in protected areas.
Solution Approach 2:
The patent implements dynamic control of satellite spot beams by continuously monitoring the position of satellites and calculating real-time overlaps with exclusion zones. The system adjusts beam transmission status dynamically as satellites move through different geographic areas, enabling coverage when safe and preventing interference when exclusion zones are entered. This dynamic approach maximizes coverage while ensuring compliance with interference constraints.
2Object-affected harmful factors
If satellite spot beams are disabled over prohibited areas, then interference with terrestrial networks is reduced, but network coverage is lost in those areas
Solution Approach 1:
The patent applies different quality levels of service by creating hierarchical exclusion zones with varying restrictions. Some zones require complete beam disablement while others allow conditional operation with modified parameters. This local differentiation enables the system to provide full coverage in areas with no interference risk, reduced coverage in areas with moderate risk, and no coverage only where absolutely necessary, thereby minimizing overall coverage loss.
3Reliability
If exclusion zones are implemented to prevent interference, then regulatory compliance is improved, but system complexity increases due to continuous monitoring and calculation requirements
Solution Approach 1:
The patent pre-calculates and stores exclusion zone boundaries and satellite orbital parameters before operations begin. By preparing this reference data in advance, the system avoids the need for complex real-time calculations during satellite operations. The monitoring process simply compares current satellite positions against pre-computed exclusion zone data, significantly reducing computational complexity while maintaining compliance accuracy.
Solution Approach 2:
The patent introduces an intermediary exclusion zone management system that acts as a mediator between satellite operations and regulatory requirements. This intermediary layer handles the complex tasks of monitoring satellite positions, calculating overlaps with exclusion zones, and making enable/disable decisions, thereby isolating the complexity from both the satellite control systems and the regulatory compliance requirements.
4Object-affected harmful factors
If device-based exclusion zones are implemented to restrict UE access, then interference is mitigated at the device level, but user connectivity and service availability are reduced
Solution Approach 1:
The patent implements device-based exclusion zones that preemptively prevent user equipment from attempting to connect to satellites when the UE is located within exclusion zones. By blocking access before connection attempts occur, the system eliminates potential interference sources while providing clear guidance to users about service availability. This approach reduces unnecessary interference attempts while maintaining user flexibility in areas where service is available.
Data Source
AI summary
Various approaches for the deployment and use of communication exclusion zones, defined for use with a satellite non-terrestrial network (including within a low-earth orbit satellite constellation), are discussed. In an example, defining and implementing a non-terrestrial communication exclusion zone includes: calculating based on a future orbital position of a low-earth orbit satellite vehicle, an exclusion condition for communications from the satellite vehicle; identifying, based on the exclusion condition and the future orbital position, a timing for implementing the exclusion condition for the communications from the satellite vehicle; and generating exclusion zone data for use by the satellite vehicle, the exclusion zone data indicating the timing for implementing the exclusion condition for the communications from the satellite vehicle.