基于SDN架构的WLAN组网技术研究

发布时间：2018-04-26 06:11

本文选题：软件定义网络 + WLAN　；参考：《北京邮电大学》2014年硕士论文

【摘要】：随着智能终端的不断发展,人们对无线资源的需求与日俱增,运营商也在积极部署WLAN网络。WLAN有多种组网方案,主要包括分布式组网方案以和集中式组网方案。但是传统的WLAN组网方案都还存在一些问题,例如分布式组网方案中设备统一管理问题,集中式组网方案中无线接入控制器节点压力问题,同时网络设备受制于提供厂商,在可扩展性方面受限。本文研究内容主要在分析传统WLAN组网方案问题的基础上,结合软件定义网络(Software-Defined Network, SDN),提出两种SDN架构下的WLAN组网方案。由于SDN网络的转发和控制分离,能够充分发挥网络设备的转发能力,解决无线接入控制器节点压力问题,同时通过软件编程实现设备统一管理,网络功能扩展灵活,不再受限于设备厂商。 WLAN网络由运营商部署,在覆盖范围内所有用户都可以连接到无线接入点,接入认证是WLAN网络应用中的一个重要部分,本论文在SDN控制器上实现了无线接入控制中的接入认证功能,验证SDN架构的WLAN组网方案可行性。在SDN控制器上实现RADIUS客户端,SDN控制器在用户接入网络之前掌握用户信息,将用户信息作为接入认证的验证信息,完成用户的接入认证功能。搭建了实验环境,进行了接入认证的实验验证。在此基础上,进一步实现多接入认证服务器的支持,可以根据用户信息将用户分组,根据用户所属组将接入认证信息发送到对应的接入认证服务器,实现多接入认证服务器支持,优化接入认证效率问题。同时使用排队论分析了多接入认证服务器对用户接入认证效率方面的提升。最后对本文所做工作进行了总结并对未来WLAN网络的发展进行了展望。
[Abstract]:With the continuous development of intelligent terminals, the demand for wireless resources is increasing day by day. Operators are also actively deploying WLAN network. WLANs have many networking schemes, including distributed networking schemes and centralized networking schemes. However, there are still some problems in traditional WLAN networking schemes, such as unified device management in distributed networking schemes, node pressure problems of wireless access controllers in centralized networking schemes, and network equipment being constrained by suppliers. Limited in scalability. In this paper, based on the analysis of the traditional WLAN networking scheme, combining with the software definition of Network Software defined Network (SDN), two WLAN networking schemes under the SDN architecture are proposed. Because of the separation of forwarding and control in SDN network, it can give full play to the forwarding ability of network equipment, solve the problem of node pressure of wireless access controller, realize the unified management of equipment through software programming, and expand the network function flexibly. No longer limited to the equipment manufacturer. The WLAN network is deployed by the operator, and all users can connect to the wireless access point within the coverage area. Access authentication is an important part of the WLAN network application. In this paper, the access authentication function of wireless access control is realized on SDN controller, and the feasibility of WLAN networking scheme based on SDN architecture is verified. The RADIUS client controller is implemented on the SDN controller to master the user information before the user accesses the network. The user information is regarded as the authentication information of the access authentication, and the access authentication function of the user is completed. The experimental environment is built, and the experimental verification of access authentication is carried out. On this basis, the support of multi-access authentication server is further realized, the user can be grouped according to the user information, and the access authentication information can be sent to the corresponding access authentication server according to the user group. To realize the support of multiple access authentication server and optimize the efficiency of access authentication. At the same time, the queue theory is used to analyze the efficiency of multiple access authentication server. Finally, the work done in this paper is summarized and the future development of WLAN network is prospected.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN925.93

【共引文献】