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High-rate satellite communications among hundreds and even thousands ofsatellites deployed at low-Earth orbits (LEO) will be an important element ofthe forthcoming sixth-generation (6G) of wireless systems beyond 2030. Withmillimeter wave communications (mmWave, ~30GHz-100GHz) completely integratedinto 5G terrestrial networks, exploration of its potential, along withsub-terahertz (sub-THz, 100GHz-300GHz), and even THz (300GHz-3THz) frequencies,is underway for space-based networks. However, the interference problem betweenLEO mmWave/THz satellite cross-links in the same or different constellations isundeservedly forgotten. This article presents a comprehensive mathematicalframework for modeling directional interference in all key possible scenariogeometries. The framework description is followed by an in-depth numericalstudy on the impact of cross-link interference on various performanceindicators, where the delivered analytical results are cross-verified viacomputer simulations. The study reveals that, while highly directional mmWaveand, especially, THz beams minimize interference in many cases, there arenumerous practical configurations where the impact of cross-link interferencecannot be neglected and must be accounted for.

Modeling Interference from Millimeter Wave and Terahertz Bans Cross-links in Low Earth Orbit Satellite Networks for 6G and Beyond