Reducing power consumption in LEO satellite network

Mohammed Hussein, Abdellatif Abu-Issa, Iyad Tumar, Abdalkarim Awad


Current Low Earth Orbit (LEO) satellite network infrastructures display poor power efficiency, running network devices at full capacity all the time regardless of the traffic matrix and the distribution of the population over the Globe. Most of the research on energy efficiency of LEO satellites has focused on component level or link level. Therefore, this kind of reseach is not holistic to try to look at the satellite system as a single node. To enhance the energy efficiency, an integral solution can be followed. The solution should exploite multipath routig and load balancing. LEO satellite network is overprovisioned, and hence selectively shutting down some satellite nodes and links during off-peaks hours seems like a good way to reduce energy consumption. In this paper, we exploit the fact that due to geographical and climatic conditions, some satellite links are expected to be loaded with data packets while others remain unused. Our approach is to power down satellite nodes and links during period of low traffic load, while guaranteeing the connectivity and the Quality of Service (QoS). Finding the optimal solution is NP-Complete problem and therefore, we explore in this work two heuristic algorithms. We evaluate our heuristics on a realistic LEO topology and real traffic matrices, considering the day and night traffic variation. Simulation results show that the power saving can be significant, e.g., larger than 50%. This is done by trading off very little in end-to-end delay.


extended lifetime; LEO satellite; sleep mode; traffic matrix;

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ISSN 2088-8708, e-ISSN 2722-2578