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Energy-efficiently collaborative data downloading in optical satellite networks

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Abstract

Optical satellite networks (OSNs) play an important role in space applications since it has some merits such as high data rate and low power. Increasing space applications generate a large amount of data on satellite so that satellites have difficulty in downloading these data to ground station timely under the limited contact window. Thus, we investigate the problem of collaborative data downloading in this paper. The problem lies on how to energy-efficiently offload data by optical inter-satellite links (ISLs) to balance data load and downlink capacity of each satellite so as to improve the performance of data downloading in OSN. Firstly, we develop the Cost Time-evolving Graph (CTEG) to describe optical transmission cost and the time-varying topology of OSN. Secondly, the problem of collaborative data downloading is formulated as Multi-objective Mixed-integer Linear Programming (MOMILP) which is proven to be NP-hard. For reducing computational complexity, we divide the scheduling time into multiple stages and propose the Multi-stage Collaborative Scheduling Algorithm (MCSA) which operates on a slot-by-slot basis. Simulations are conducted in the joint platform and results demonstrate that, compared with CoDld and No-ISLs, the MCSA provides a relatively high data throughput meanwhile drastically reducing energy consumption generated by data offloading.

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Acknowledgement

This paper is supported by program ‘National Key R&D Program of China’ (2016YFB0502402)

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Authors and Affiliations

  1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, China

    Xianfeng Liu, Lei Yang, Yong Zhao & Chengguang Fan

  2. National Innovation Institute of Defense Technology, Chinese Academy of Military Science, Beijing, 100000, China

    Xiaoqian Chen

  3. School of Electronic Science and Engineering, Nanjing University, Nanjing, China

    Kanglian Zhao

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  1. Xianfeng Liu
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  2. Xiaoqian Chen
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Correspondence to Xianfeng Liu.

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Liu, X., Chen, X., Zhao, K. et al. Energy-efficiently collaborative data downloading in optical satellite networks. Wireless Netw (2019). https://doi.org/10.1007/s11276-019-02120-5

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