Satellite Beam Planning for Interference Mitigation
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Solution Overview
Problem
In non-terrestrial networks, the hexagonal grid-based satellite beam placement methodology leads to high inter-satellite interference at the edges of satellite coverage areas due to beam overlap, causing service area interference and reduced signal quality.
Innovation Solution
The method involves modifying satellite beam bore-sights using a hexagonal mapping, identifying and reducing the power of beams outside this mapping, and optimizing beam bore-sight locations to maximize the signal-to-interference ratio (SIR) by redistributing beam directions and applying power control, ensuring a convex beam footprint with a boundary where serving and interference beams have equal power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hexagonal grid-based beam placement is used, then beam coverage is simplified and systematic, but inter-satellite interference increases at coverage edges
Solution Approach 1:
The patent applies different beam placement strategies for different regions. Interior regions use standard hexagonal grid placement, while boundary regions have their beam bore-sights optimized separately to reduce interference. This local differentiation allows the system to maintain simplicity in most areas while addressing interference issues where they occur.
Solution Approach 2:
The patent dynamically adjusts beam bore-sight locations based on the specific coverage area and interference conditions. By optimizing bore-sight positions in boundary regions rather than using a fixed hexagonal grid, the system adapts to local requirements and reduces interference while maintaining coverage.
2Reliability
If beam bore-sight locations are optimized to reduce interference, then signal-to-interference ratio improves, but beam footprint shape becomes non-convex
Solution Approach 1:
The patent divides the coverage area into interior and boundary regions, applying different optimization strategies to each. This segmentation allows the beam footprint to be convex in interior regions while allowing more flexible, interference-optimized shapes in boundary regions, thus balancing geometric simplicity with interference reduction.
3Object-affected harmful factors
If power is reduced for beams outside hexagonal mapping, then inter-satellite interference decreases, but coverage area is reduced
Solution Approach 1:
The patent applies power control selectively to boundary beams that cause interference, while maintaining full power for interior beams. This localized power adjustment reduces interference at the cost of minimal coverage loss, as the optimized bore-sight locations in boundary regions compensate for the reduced power.
Data Source
AI summary
A method and system for mitigating inter-satellite interference are provided. The method includes modifying a beam bore-sight of a satellite according to a hexagonal mapping, identifying beams of the satellite positioned outside of the hexagonal mapping, and reducing power of the beams positioned outside of the hexagonal mapping.