Research Of Future Access Network Model And Networking

As one of the two major components of modern communication network,the global access network market continues to grow.The initial target of the access network design is mainly to solve the communication problems between the core network and the user,but the increasing number of equipment and various access network services bring new challenges to the future access network.At the same time,more and more social requirements are being embedded into the access network as services.These require the future access network to support complex applications and have service oriented capability such as low latency,high availability,reliability and security,high bandwidth,energy efficiency which far exceeds physical network capability.The access network is also faced with the problem of rigid architecture,relatively independent network and low utilization.Network virtualization can be seen as an effective way of solving this problem.The current access network is a network with relatively fixed topology,that is,nodes,links,and routing remain unchanged in a certain period of time.But with the application of network virtualization technology,it is possible to construct a future access network dynamically.In order to provide flexible services,network functions gradually extend to the edge of the network and the service layer with the development of a variety of access network technologies and the service requests.Thus,these bring new challenges to the access network virtualization technology.Therefore,in response to the above challenges,it needs further study for the future access network model and networking technology.Aiming to solve these problems,with the support of the National Natural Science Foundation of China,based on the basic principles of network virtualization,future access network model and networking are conducted in this thesis.The main works and innovations are listed as follows:1)To solve the rigid problem of traditional network architecture,a novel framework and indicator for modeling the future access network are proposed.The framework frames the future access network in four dimensions:High-level Physical Capability,Softwarization&Virtualization,Service Oriented Dynamic Networking and Deep Coupling with Social Elements.Based on this framework,an indicator is given which is used to optimize access network capability based on the study of four dimensions and their relationship.High-level Physical Capability extends the traditional network resources to the computing,storage and networking resources,making the future access network can provide more services;Softwarization&Virtualization technology improves the efficiency of resources and acceptance ratio by abstracting the resources;multiplexing services not only brings more revenue but also reduces costs/revenue.The integrated indicator measuring the future access network capabilities is proposed aiming to obtain higher network capacity by adjusting strategies which not only consider the access physical technology,networking technology,cloud computing,virtualization,software and other factors but also consider the complex and interaction of social elements.2)To satisfy the requirements of low latency dynamic networking for future access networks,a cost-effective free scale coupling network construction method model is proposed.This method not only fits for physical network construction but also fits for virtual network construction,which is evaluated by simulation and experiments.A layered coupling network model is established in which network is divided into several networks based on link property.Based on continuum,links are added in upper layer network with a certain probability by two continuous processes and thus network evolves into a scale free network.Network topology evolution and dynamic traffic performance are evaluated.The result shows this method can effectively reduce the network latency within cost-effective requirement and initial network characteristics are maintained.It combines the advantages of layered network and cost-effective.3)To satisfy the requirement of service-oriented dynamic networking of the future access network,service-oriented dynamic network architecture-service entity network virtualization architecture is proposed based on the virtualization research of the future access network.Service is treated as a network composed of functional entities which can be abstracted as virtualization entities of the network.Service entity network is proposed as a network with public virtualization entities,private virtualization entities and links.The entity is abstracted as a virtual element of the network.Functional equivalent virtualization entity and link can be used for different services at the same time.Compared to NFV,the architecture we propose takes decomposed service network as a new virtualization layer to consider and gives a novel Top Down design by introducing entity concept.It makes it possible to form a global view of information service request which is important to service provider and service developer.We extend traditional network model to a new model whose nodes have private and public properties.It makes it possible to form entity pooling and facilitate multiplex service entity networks.The evaluation results demonstrate the superiority of the proposed architecture for infrastructure provider.