基于SDN发布订阅系统中多媒体传输质量保证方案的设计与实现

With the continuous development of the Internet, network bandwidth is no longer the bottleneck of restricting data transmission, multimedia data transmission has increasingly become the norm in people\'s production and life. In traditional networks, the transmission mode of storage and forwarding has no control over the overall situation of the link, and has no guarantee on the data delay and packet loss rate, so it can not be done. To guarantee the quality of multimedia transmission, a new network transmission mode with high efficiency and classification is urgently needed to enhance users\'service experience. This topic is based on the publish/subscribe system of SDN network, providing multimedia transmission services for users. Using SDN switch to speed up transmission speed, the switch is only responsible for matching and forwarding, while the controller uses improved routing algorithm to calculate new paths according to the network load, which enhances the delay and jitter guarantee for multimedia data transmission; using publishing and subscribing system to simulate message transmission between users in real network environment Behavior, thus adapting to dynamic network needs. On the basis of queue adjustment and traffic management of the original system, the original function modules are migrated and a new design concept is adopted to support multimedia data transmission, routing algorithm and multi-port registration. At the same time, multimedia data transmission is realized by coding, and queue adjustment strategy and routing algorithm are used. For transmission quality assurance.