As 5G networks expand worldwide, concerns over aviation safety have sharpened. At the center is the risk that 5G signals may interfere with aircraft radio altimeters — instruments critical for determining altitude during landings and in low-visibility conditions. A research team at King Abdullah University of Science and Technology (KAUST) has now come up with a mathematical model to prevent such conflicts, aiming to protect aviation systems while preserving strong network performance.

The study, published in IEEE Transactions on Wireless Communications, introduces the idea of an ideal exclusion zone. These zones define areas near airports where higher-frequency 5G signals should be restricted to reduce interference. The approach offers regulators a framework for balancing passenger safety with mobile connectivity demands.

Led by Professor Mohamed-Slim Alouini, the KAUST team is the first to use stochastic geometry — a mathematical tool for modelling random network layouts — to forecast how 5G transmissions might overlap with radio altimeter signals. “5G operates near the same bandwidth as aircraft radio altimeters, which may cause signal interference,” explained Alouini. “This highlights the need to establish exclusion zones to reduce interference levels”.

The research suggests that triangular-shaped exclusion zones provide the best compromise, offering effective shielding for altimeters while limiting the impact on mobile networks. Within these areas, regulators could allow only lower-frequency signals, keeping higher-frequency bands that are more prone to interference outside the zone.

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Simulation results underscored the stakes. A single 5G tower placed inside the exclusion zone was shown to reduce overall efficiency by 20%, while three towers could slash performance by as much as 50%.

The project, supported by Saudi Arabia’s Communications, Space & Technology Commission (CST), positions the Kingdom at the forefront of a global debate. As countries refine their 5G rollout strategies, KAUST’s framework could help regulators worldwide protect aviation safety without stalling digital infrastructure progress.