Research Of Open Control Mechanism And Virtualization Technology For Software Defined Cloud Access Networks

With the rapid growth of IT industry,OTT service has gained great development and been widely accepted by users.With the rapid growth of Internet data traffic,OTT services occupy a large amount of bandwidth,making the basic network into a simple transmission pipeline.Therefore,the optical access network technology is becoming more and more important in the open,intelligent and virtualized direction.Taking advantage of access network proximity to users,SDN and NFV technologies are introduced to build an edge-access network that can be flexibly deployed by an open programmable interface.The edge access network is further integrated with an edge data center to provide personalized service for users by virtualized network function service chains,meet the requirements of flexible resources scheduling,rapid applications deployment,network bandwidth and network capabilities on-demand provisioning.In this paper,we mainly researches on the reconstruction and open control mechanism of cloud access network.In detail,this paper launches research work around the design and implementation of bandwidth reservation system,the access control technology of dynamic price and technology of providing virtualized service chain.The outcomes are expressed as follows:(1)The current optical access network can only support single type of services,and lack the refined bandwidth management and differentiated service capabilities,so that it limits the innovation of new service and improvement of QoS.This paper develops a user-oriented bandwidth reservation system based on software-defined cloud access network.Through a user-friendly northbound interface and open control network function,application-driven bandwidth services are customized on demand so that network resources can be flexibly allocated according to applications and users.Additionally,it not only provides differentiated access bandwidth and quality of service guarantee,but improves customer service satisfaction and network resource utilization.(2)Aiming at the problem that the fixed charging method of monthly or annual subscription is difficult to provide differentiated value-added services,this paper proposes a traffic-aware dynamic pricing strategy.Based on the user utility function and the operation cost function,an optimization equation is constructed,and the benefits of users and operators are balanced by the price so as to maximize the benefit of the entire system during the billing period.Through the analysis of the simulation results,the total system efficiency can increase up to 20%compared with fixed pricing plan.Therefore,a reasonable dynamic pricing mechanism can make the whole network system operate normally and steadily,and enhance the customer satisfaction while gaining the added value for the operator.Besides,the approach adjusts the network traffic and shift peak load.(3)Network function virtualization transforms the network function into software and deployed in a standard server,so the network service chain can be dynamically provided and flexibly expanded through centralized control and scheduling based on software defined networks.In this paper,we propose a delay-aware routing optimization scheme of service chain based on software-defined cloud access network.Considering the layered network diagram and the delay cost of links and nodes,we adopt the shortest path algorithm to reduce the cost of providing service chain under the premise of guaranteeing service order.