Research For QoE Routing Model In Software Defined Networks

With the rapid development of the Internet,the size of internet continues to expand,the number of user increases a lot,the types of flows are no longer single,multimedia audio and video gradually occupy the dominant position,which led to the explosion of network traffic,but limited network resource has been difficult to afford various types of flows,the end users experience quality are difficult to be guaranteed.How to optimize the quality of the user experience has become a hotspot.The traditional network has been difficult to make progress in this area because of its structural limitations.In recent years,software defined network,a new generation network architecture is proposed and it finds a new way to optimize the network performance,which control layer and forwarding layer is separated,network's global view can be obtain and routing strategy is programmable.In this regard,we take quality of experience as standard under SDN network environment,through the optimization of the routing algorithm,to optimize the network performance and the quality of the user experience.Because of this routing problem is multi constrained and feasible solution is not only,the paper makes ant colony algorithm as the core algorithm of routing algorithm,and constructs a routing model based on QoE-ACO routing model in SDN network environment.The model mainly includes the topology aware module,ant colony routing module and terminal information exchange module.In the process of transmission services,networks global link information and users' parameters are all obtained by controller.According to the MOS utility function,the QoE values will be obtained,which is ant colony routing's constraint condition so that users can select from the current network environment in a path which can guarantee the quality of experience.Simulation experiments were carried out in the Floodlight and Mininet.With the different types of flows transfer,QoE-ACO routing,QoS-ACO routing and Dijkstra routing will be compared.The main parameters which are compared in the transmission are delay,packet loss rate,QoE values with different flows and the change trend of QoE value under multi-request.The experiments result shows that the model proposed in this paper will provide better user experience in the transmission of audio and video than the traditional routing model when network traffic is busy.