Software-Defined Networking (SDN) has opened a promising and potential approach\nfor future networks, which mostly requires the low-level configuration to implement different\ncontrols. With the high advantages of SDN by decomposing the network control plane from the data\nplane, SDN has become a crucial platform to implement Internet of Things (IoT) services. However,\na static SDN controller placement cannot obtain an efficient solution in distributed and dynamic\nIoT networks. In this paper, we investigate an optimization framework under a well-known theory,\nnamely submodularity optimization, to formulate and address different aspects of the controller\nplacement problem in a distributed network, specifically in an IoT scenario. Concretely, we develop a\nframework that deals with a series of controller placement problems from basic to complicated use\ncases. Corresponding to each use case, we provide discussion and a heuristic algorithm based on\nthe submodularity concept. Finally, we present extensive simulations conducted on our framework.\nThe simulation results show that our proposed algorithms can outperform considered baseline\nmethods in terms of execution time, the number of controllers, and network latency.
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