Research And SDN-based Technology Realization On Construction For Virtual Converged Network

With the continuous development of communication technology and Internet technology, the demand for the network is greatly improved, and various types of communication networks are emerging. The intercommunication and integration of network services become the general direction of network development. Future network will designed as user-centered, which will bring cooperation and integration of different types, different structures and different scale network. Among them, the optical fiber and wireless converged network is one of the most concerned technology. Optical fiber transmission has the advantages of wide bandwidth, high reliability and strong anti-electromagnetic interference ability, but its transmission path is fixed and the flexibility is poor; however,the wireless transmission mode can provide users flexible, fast network access. Through integration of optical network and wireless network, we can obtain higher quality network services. In this paper, we propose a converged network model of Fiber-Wireless (FiWi) and the rapidly developing information and communication technology. At the same time,a converged network virtualization construction scheme is designed.Researchers at home and abroad have done a lot of research on the FiWi convergence network, including network topology, node location selection,network deployment scheme, routing mechanism and so on. However, the existing research work mostly adopts the traditional networking idea. The networking scheme can not get rid of the specific technical details, and it is difficult to guarantee the quality of service, and the resource utilization rate is low. In this paper, we propose a construction method for virtual converged network, which shields the differences of heterogeneous underlying network. Software Defined Network (SDN) is used to implement network virtualization and we design corresponding networking platform to make experiments. The main work of this paper is as follows.1. We propose a limited scale-free construction model for virtual networks. The BA model adds long-range links to the network according to the rules of growth and preferential attachment, which reduces average path length of the network. Based on that, we make improvement and introduce the cost-effective parameter to limit the process of construction, to achieve a flexible, on-demand virtual network construction. Cost-effective is defined as the ratio between cost and revenue. Users can set a threshold value (denoted as beta) for cost-effective, which can control the progress of construction in a reasonable range. Only when a link has lower cost-effective value than preset threshold, can it be added to the network.2. The convergence network model of FiWi and ICT is proposed, and the network construction platform based on SDN is designed as the realization way of virtual network. SDN is an emerging network architecture, whose idea is decoupling control plane and forwarding plane.The characteristics of software interface and open programming greatly improve the flexibility of network control and service deployment. It create a new road for network virtualization. In contrast to existing SDN routing algorithms, which aim at finding a single shortest path, this paper provides an innovative approach to network construction to achieve global network optimization.3. Build SDN experimental platform based on OpenDayLight controller and give experimental verification and analysis. The main process is: the underlying network building, topology discovery, network construction calculation and send down flow table according to construction results. The experimental results show that the proposed algorithm can effectively improve the network performance and reduce the network transmission delay.At the end, the paper summarizes the whole work of this paper, and show prospect of network virtualization construction based on the SDN.