Design And Implementation Of Network Traffic Scheduling Method Based On SDN

In recent years,the mobile Internet has developed rapidly.At the same time,traffic scheduling technology,as an important means to optimize network performance,has attracted more and more attention of researchers.Currently due to the limitations of traditional IP networks forwarding mechanism,it is difficult to use the network resources flexibly and efficiently,making traffic scheduling technology face many challenges.SDN has brought new ideas to the research of traffic scheduling technology.Through the separation of control and forwarding,the controller can sense the global network status information and develop a more optimized scheduling policy based on real-time network status and business needs.Therefore,applying SDN to the network traffic scheduling technology is an effective method to improve the transmission quality of the applications.This paper introduces the research status of traffic scheduling techniques in WLAN and analyzes the assurance issues of transmission quality about the online multicast video in WLAN.Then this paper designs an optimized method of wireless multicast based on SDN,including three core modules:packet optimization module,bandwidth allocation module and path selection module.By dynamically maintaining the mappings of multicast,this method can map a multicast packet into multiple unicast packets.This ensures the transmission quality of packet and reduces the loss of business packet.After mapping a multicast packet into multiple unicast packets,this may make wireless resources insufficient,resulting in resource competition.By introducing virtual slice of bandwidth based on user needs,this method can isolate bandwidth and guarantee bandwidth requirements of a specific unicast stream.At the same time,in order to avoid the loss of multicast packet during packet transmission in WLAN,this method perceives data as multi-attribute decision algorithm factor and chooses the right path for the packet forwarding,improving the reliability of data transmission.This paper set up a test environment for traffic scheduling method in WLAN based on SDN/OpenFlow,verifying the functionality and performance of the optimized method of wireless multicast.