Abstract
Multiple low earth orbit (LEO) satellites form a constellation that can construct the network to achieve full coverage of the ground. However, the topology of the LEO satellite network is highly dynamic, and end-to-end transmission is a huge challenge for the LEO satellite network. As an important technology to solve the network dynamic management, the software defined network (SDN) has been introduced into the LEO satellite network. To manage the LEO network efficiently, the controllers of the SDN-based LEO satellite network can be deployed on some satellites and directly controlled by the ground base stations (GBSs). Since GBSs are static, so the controller should be migrated from one LEO satellite to another LEO satellite. Controller migration as an elastic control method plays an important role in the SDN-based LEO satellite network. Aiming at the problems of low migration efficiency and high migration cost in existing migration schemes, we propose a dynamic migration strategy of the controller. First, we analyze the load composition of the controller, and construct a load function, set the trigger factor to determine the load imbalance. Then, we determine the migration target and establish a migration efficiency model, and consider the load balancing rate and migration cost to determine the migration switch and the migration controller. Finally, by setting migration triplets to complete the migration mapping, to achieve efficient controller migration in the LEO satellite network. Simulation results show that this strategy can effectively reduce the controller response time, reduce the migration cost, and improve the controller throughput.
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Acknowledgments
This work was supported in part by the National Natural Science Foundation of China (No. 61571104), the Sichuan Science and Technology Program (No. 2018JY0539), the Key projects of the Sichuan Provincial Education Department (No. 18ZA0219), the Fundamental Research Funds for the Central Universities (No. ZYGX2017KYQD170), the CERNET Innovation Project (No. NGII20190111), the Fund Projects (Nos. 2020-JCJQ-ZD-016–11, 61403110405, 315075802, JZX6Y202001010161), and the Innovation Funding (No. 2018510007000134). The authors wish to thank the reviewers for their helpful comments.
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Huo, L., Jiang, D., Yang, W., Chen, J. (2022). A Dynamic Migration Strategy of SDN Controllers in LEO Networks. In: Jiang, D., Song, H. (eds) Simulation Tools and Techniques. SIMUtools 2021. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 424. Springer, Cham. https://doi.org/10.1007/978-3-030-97124-3_2
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DOI: https://doi.org/10.1007/978-3-030-97124-3_2
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