Robust Beam-to-Satellite Routing Strategies for Megaconstellations

Robust routing strategies for satellite constellations are crucial for mitigating outage probability amidst satellite failures. While existing literature primarily addresses robust routing within the satellite network, this letter introduces innovative strategies to enhance robustness in ground-satellite links. Leveraging established heuristic and optimization methods, these strategies are tailored to incorporate redundancy. Using the Starlink constellation with 200,000 users as an example, our findings illustrate a significant reduction in outage probability for end-users, albeit with a trade-off of reduced capacity. Specific approaches demonstrate the capability to sustain a substantial portion of throughput, maintaining 96% while reducing the outage probability up to 66% and 10% for internal and external failures, respectively.