Improving Availability through Energy-Saving Optimization in LEO Satellite Networks
Recently, satellite networks are widely used for communication in areas lack of network infrastructures, and will act as the backbones in the next generation internet. Therefore, the availability of satellite networks is very important. In space, the ener
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Abstract. Recently, satellite networks are widely used for communication in areas lack of network infrastructures, and will act as the backbones in the next generation internet. Therefore, the availability of satellite networks is very important. In space, the energy is always limited for satellites, and highly efficient energy utilization would certainly improve the availability of satellite systems. In this paper, we consider the energy-saving optimization for the LEO satellite network instead of a single satellite. We modify and extend the multicommodity flow model [3] to switch off satellite nodes and links as much as possible in LEO satellite networks. Taking advantage of the multi-coverage scheme and traffic distribution patents in satellite networks, we improve the heuristic algorithms in [3] to turn off the unnecessary satellites, up-down links and inter-satellite links respectively up to 59%, 61% and 72% under the constraints of link utilization and routing hops increase ratio, and the total energy saving ratio can be up to 65%. Finally, the availability of LEO satellite networks has been deeply developed. Keywords: Reliability, energy-aware, low earth orbit (LEO) satellite network, snapshot routing algorithm, minimal cost multi-commodity flow model.
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Introduction
Since the inherent large range broadcast and rapid deployment property of satellites, satellite networks are widely applied in the emergent communication regions, oceans, desserts, and many other places lack of network infrastructures. Besides, satellite network will become an integral part of next generation internet in the future, so the availability of satellite networks is becoming more and more important. In space, satellites can only convert the solar power or nuclear power into electricity to support the control, maintaining and communication system as well as charging the battery. For the energy limitation of satellites, decreasing the energy consumption would certainly improve the availability of the satellite systems. There are some researches focusing on the satellite energy-saving problems [7] [8], however, most of them aim at the energy and resource allocation of the single satellite, not the whole satellite network or satellite constellation. Compared to the durative solar-coverage of geostationary orbit (GEO) satellite, the low earth orbit (LEO) satellite would move into the shadow behind earth almost in every orbit cycle, and Linawati et al. (Eds.): ICT-EurAsia 2014, LNCS 8407, pp. 680–689, 2014. © IFIP International Federation for Information Processing 2014
Improving Availability through Energy-Saving Optimization in LEO Satellite Networks
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then only the battery can be available, which is the same condition as the wireless sensor networks [2]. For the satellite moving problem, we use the classic snapshot routing algorithm [9] to keep the network topology changing stably. The idea of switching off devices as many as possible in terrestrial networks is provided in [3]. The network energy saving problem is concluded as a
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