Research On Software-defined Optical Network For Streaming Media Service

With the rapid development of Internet and streaming media transmission and storage technology,streaming media has been rapidly developed in the Internet,and has gradually become the main business of network service providers.In order to provide stable network environment for streaming transmission and enhance users' quality of experience,operators should combine existing network infrastructure resources,select corresponding network structure according to business development and traffic load.Based on the extensive research of streaming media and optical network,a thorough research and study is carried out in this paper.First of all,from the perspective of intelligent management and efficient utilization of optical network resources,this paper deeply studied the SDON service architecture networking scheme,resource abstraction and routing strategy,including SDON centralized control mechanism design,OPS optical node control,and virtual network mapping algorithm.Furthermore,the shortest path selection algorithm in link mapping is improved.The optimized algorithm chooses the shortest path according to the current link bandwidth status,which greatly enhance the network link resource utilization and users' video experience.Secondly,based on the optimized SDON architecture,this paper designs a resource allocation and management for DASH system to improve each client's network source configuration and monitoring.Furthermore,in multi-user scenario,a optimal design of adaptive bit rate selection algorithm is proposed to provide a good video stability for all clients and maximize the per user's quality of experience in a fair way.Finally,this paper uses RYU as the SDON centralized controller,and uses Mininet platform to build the network topology,DASH video client and server to complete the simulation of the video transmission process,and the feasibility of the proposed architecture and algorithm is verified by simulation experiments.