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arXiv · 2605.02001

Throughput Analysis and On-Board Buffer Sizing for Hybrid RF and Optical LEO Satellites

Cao-Vien Phung·Thomas Röthig·Admela Jukan
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Abstract

Low Earth Orbit (LEO) satellite networks are increasingly adopting laser communications based on Free Space Optics (FSO). Although laser inter-satellite links offer high throughput and low latency, RF up- and downlinks remain necessary to maintain connectivity during optical outages caused by adverse atmospheric conditions. The hybrid RF/FSO up- and downlinks require an efficient transmission scheduling and buffer sizing in satellite network nodes, due to traffic asymmetry and variable capacity. This paper analyzes throughput performance and buffer sizing in hybrid RF/laser satellite networks with finite buffer capacity, interference-aware scheduling, and weather-dependent laser link outage probabilities. Numerical results indicate that laser communications bring significant performance gains. Instead of increasing the transmission power of the satellite to maximize the throughput, we can select a suitable transmission scheduling priority to achieve a maximum throughput, while minimizing the buffer requirement, and lowering packet loss probability under varying weather conditions and constraints.

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Cao-Vien Phung, Thomas Röthig, Admela Jukan. 2026-09-13. Throughput Analysis and On-Board Buffer Sizing for Hybrid RF and Optical LEO Satellites. https://arxiv.org/abs/2605.02001

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