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Multiple controllers sleeping management in green software defined wireless networking

Software Defined Networking (SDN) promises the formidable configuration, vigorous evolution, and satisfactory performance, which are helpful to network operators. Hence, researchers in the field of wireless are increasing their attentions in SDN-related orientation. SDN is still in its initial period. Some essential issues still remain not completely resolved, and the scalability of control plane is the most intractable one with the explosive increase of wireless network traffic. To address this issue, many researchers have proposed multiple controllers to realize logically centralized control layer. Along with the number of controllers increasing, the other problem appears, which is the energy consumption in SDN. Especially the energy consumption in the wireless network has been greatly serious. In this paper, taking advantage of multi-controller architecture called Hybridflow, we propose an M-N policy multiple controllers sleeping mode by switching off redundant controllers when system is in the light traffic condition. Simulation results reveal that the proposed M-N policy multiple controllers sleeping mode achieves superior energy efficiency compared to no sleeping mode.