Study The Performance Of Video Streaming Media Transmission Based On SDN Network

With the booming development of the Internet industry and multimedia technology,video streaming media applications on the Internet shine brilliantly.there strict QoS performance brings convenience to people's life and work,but at the same time they also bring a great challenge to the network transmission.The best effort forwarding mode and distributed control form of the traditional network often lead to the hysteresis of traffic scheduling in the network,which will cause the instability of video transmission and seriously affect the service quality of video transmission.Software Defined Network(SDN)is a kind of network architecture which is different from the traditional network structure,its characteristics of transfer control separation,centralized control and programmability provide a unique solution to the problems of traffic engineering and QoS routing in the network.The purpose of this paper is to improve the transmission performance of video streaming media by utilizing the characteristics of SDN,the main contributions of our work are as follows:Firstly,this paper divides the businesses in the network into four types,and according to the different needs of businesses for QoS,the paper classifies the priority of businesses and sets different priority values for them,and proposes the QoS control strategy for video streaming media.Secondly,the QoS routing based on genetic algorithm computes the transmission path for the video streaming media(the highest priority business),and calculates the transmission path for other priority services at the cost of the jump number based on the Dijkstra algorithm.And when the controller monitors congestion in the transmission path of video streaming media,dynamic routing measures are adopted to better protect the QoS of video streaming media.Thirdly,the HTB queue rules are used to implement the differentiated scheduling of different priority services on the OpenFlow switchs,which gives priority to guaranteeing the QoS of video streaming media services.At the same time,it provides the borrowing bandwidth mechanism when bandwidth is sufficient,so as to guarantee the transmission requirements of each service flow as much as possible.Finally,the topology management module,link information measurement module,routing management module and queue scheduling module in QoS control strategy are designed and fulfilled separately,and the QoS control strategy is simulated and tested in the SDN network transmission environment built by Mninet,Ryu controller,camera and other software and hardware.the test results show that compared with the path selected by the Dijstra algorithm based on the number of jumps,the QoS control strategy can select a path for video streaming media that conforms to its delay within 10 s and the packet loss rate is 20 × 10.When the transmission path is congested,compared with no dynamic routing mechanism,QoS control strategy can reduce the time of video stream throughput returning to stability by about 63.5%.QoS control strategy can guarantee the QoS of different priority services at the data forwarding layer,so as to ensure the QoS requirement of the video streaming media service end-to-end.