无线移动自组织网络中用户接入管理方案的设计与实现

【作者】 王琰；

【导师】 毛玉明；

【作者基本信息】 电子科技大学 ， 通信与信息系统， 2004， 硕士

【摘要】 通信的最终目的是使任何人在任何地点、任何时间都能与任何人进行任何方式的通信,但是在传统网络中,其绝大多数网络设备被网络连线所禁锢,无法实现可移动的网络通信,因此无线网络应运而生。我们结合无线移动通信网络、IP网络、Ad Hoc网络三者的优势设计了无线移动自组织网络,网络由移动路由器(Wireless Router)和移动主机(Wireless Host)组成,可以在没有预先布设的基础设施的条件下方便地迅速组网。由于无线自组织网络中的通信节点都是可移动的,所以对该网络中用户接入管理不同于传统网络。只有该网络允许接入的特定用户才能接入网络使用网络提供的通信服务,而且虽然网络中的WR和WH位置会改变,已接入网络的WH通信的连续性却必须保证。这是无线移动自组织网络用户接入管理的关键。为了研究问题的方便,本文中把无线移动自组织互联网络划分为多个管理域,每个管理域都是一个单独的IP子网,管理域之间可以直接互联,也可以通过其他网络如有线网络来实现互联。这样网络的用户接入管理就分为域内用户接入管理和域间用户接入管理。本文中只研究了域内用户接入管理。如何在此基础上发展域间管理,这是未来需要继续研究的问题。本论文首先介绍无线移动自组织网络,然后针对无线移动自组织网络的特性分析了用户接入管理涉及的关键技术,并阐述了用户接入管理设计方案。论文的第三章简单介绍了目前常用的实现用户接入管理的RADIUS协议,这个协议也是本系统用户接入管理技术的基础。在第四章中首先分析了WH和WR之间在用户接入管理之间的通信细节,然后又讨论了在WR和用户接入管理服务器RADIUS Server之间如何基于RADIUS协议通信、如何扩展RADIUS协议以适应无线移动自组织网络的特点。第五章给出了在WR上实现RADIUS客户端软件的方案。第六章分析了在freeradius server的基础上如何设计扩展RAIUS服务器。最后,介绍了在实际环境中的实验结果,并由此引发了对安全性的一些思考。更多还原

【Abstract】 What is the perfect personal communication? As we know, it should look like this: anyone can communicate with any other one at any place at any time, transporting any data, such as voice, image and file. In traditional network, these devices, just like routers and hosts, are fixed with cables. How can a mobile host logins in Internet when it is moving from one place to other place? The answer is WMSN. WMSN, Wireless Mobile Self-organization Network, adopts the advantages of three popular networks: Mobile Wireless Communication network, IP network, and Ad Hoc network. WMSN is a new type of multi-hop network, which can combine with Internet by wire cables, or connect with other WMSN by wireless channel. WMSN, whose name tell us its characters: its all communication points(Wireless Hosts and Wireless Routers) are movable, these points communicate by wireless channels, these points can form a network by themselves rapidly without any infrastructural network devices installed in advance. Hence, there are more demands on the subscriber access management in the network than in the traditional network. It is very important to ensure the subscribers’ benefits and permit them enjoy the network service. Then, how to prohibit illegal users accessing the network? How to maintain subscribers’ communication during handoff? How to avoid hostile users to access the network with data spied on the wireless channels used by the network? The aid of the thesis does be providing effective solutions for these ‘how to’.To simplify these matters, we divide the network to some management realms. So, the subscriber access management includes two parts: in one realm, and among realms. The subscriber access management in one realm is primary and key. The paper mainly deals with the subscriber access management in one realm.The paper puts forward a centralized subscriber access management scheme in one realm. The scheme makes use of the three-section (WH-WR-RADIUS Server) model. As we know, the communication between WR and RADIUS Server is based on the RADIUS protocol, but the communication protocol between WH and WR is undefined yet. The protocol is designed in the fourth chapter. On the other hand, the standard RADIUS protocol only provided the AAA functions for the subscriber access management, but in WMSN, the subscribers is moving frequently, the AAA management have to accompany the subscriber location management. This is mean <WP=6>that the RADIUS protocol has to be extended to achieve location management function. Additionally, except to authenticate the license of the user when one user tries to access the network, it is also necessary to authenticate the license of the user during handoff. The arithmetic and protocol are designed for achieve the license authentication during handoff.After programming and testing the whole software system of the subscriber access management, I find some unsolved problems about the communication security. These are the pity of this paper; however, the further research on these problems is still necessary.更多还原