Research On Wireless Network Control Mechanism Based On Intelligent SDN

Software-Defined Networking(SDN)is a new networking paradigm,offers flexible control of network by decoupling of data plane and control plane,centralized management and programmable interface.The application of SDN in wireless network has been getting more and more attention.The thesis researches wireless network control mechanism based on intelligent SDN.On the basis of comparison and analysis of existing research results,the thesis proposes intelligent SDN based management solution for WLANs.APs and switches are controlled by SDN controller in an united way by extending OpenFlow protocol,and the managements problems of centralized access,mobility and interference are solved in the large scale WLANs.We propose layer 3 seamless handoff mechanism for solving handoff problem.A channel allocation algorithm based on interference graph and traffic prediction is also proposed to solve interference problem in the system.The solutions prove to be effective in the simulation by using Mininet.To satisfy the requirements of evolution to heterogeneous,fusion and multi-tenant of wireless network,the thesis also proposes an intelligent SDN based management architecture for heterogeneous network.Wireless access network and core network are controlled and coordinated in the same framework.The dynamic allocation of wireless access network resources is implemented by using intelligent policy center in the proposed architecture.We analyse forwarding path allocation problem of traffic flow in the multi virtual tenants scenario and propose network slicing algorithm and path allocation algorithm based on reinforcement learning.In the simulation,we validate the effectiveness of the proposed solution.