【作者】 李建波；

【导师】 杨庚；

【作者基本信息】 南京邮电大学 ， 计算机应用技术， 2011， 硕士

【摘要】 无线传感器网络(Wireless Sensor Networks,简称WSNs)是由部署在一定区域的传感器节点组成，通过无线通信的方式形成的一个多跳的网络系统，并综合了分布式处理、无线通信、嵌入式等技术，具有广泛的应用前景。由于WSNs通常工作在无人值守的环境中，因此容易遭受到各种拒绝服务(Denial of Service,简称DoS)攻击。如何避开受攻击的网络区域而将数据安全传输至目的地对于减少拒绝服务攻击的危害和维护网络可用性有着至关重要的意义。本文通过研究已有的多路径切换协议，从网络拓扑结构方面对现有的协议进行了分类，重点分析了协议的多路径切换性能，并比较了各自的优缺点。根据这些研究成果，本文提出了一种新的多路径切换协议——双树型多路径切换协议(Double-Tree Multi-PathSwitch,简称DTMPS)，协议采用了双树型的网络节点拓扑结构，在WSNs遭受到DoS攻击的情况下，网络中的节点通过在下（上）行父节点和上行子节点之间进行下一跳节点的选择，能快速、实时地切换到新的、可靠的传输路径上，以此来避开遭受攻击的网络区域，保障网络的可用性。最后，在OPNET Modeler仿真平台上实现了DTMPS协议，并将其与现有的DM(Disjoint Multi-path)协议和MTR(Multiple Tree-based Routing)协议做了切换性能和能量消耗两方面的比较，实验结果表明DTMPS具有可行性和实效性。文章最后也对研究成果做了总结和展望。更多还原

【Abstract】 Wireless Sensor Networks (WSNs) are a multi-hop network formed by way of wirelesscommunication, and consist of sensor nodes deployed in a certain region. With great wide rangeof applications, WSNs combine the technologies of distributed processing, wirelesscommunications, embedded and so on. Due to working in the unattended environment, WSNsare vulnerable to all kinds of denial of service (DoS) attacks. How to avoid the areas underattack and transmit the data to the destination safely has a crucial importance in reducing thehazards caused by DoS attacks and maintaining the availability of the network.By studying the existing multi-path switiching protocols, this paper classifies these protocolsin network topology, analyzes the multi-path switching performance of these protocols, andcompares their respective advantages and disadvantages. The paper presents a new multi-pathswitching protocol, called DTMPS(Double-Tree Multi-Path Switch) base on the research results.The protocol uses the double-tree network topology. When WSNs are attacked by DoS, sensornodes can switch to a new, reliable transmitting path by choosing the next-hop node indescending(ascending) parent node or ascending child nodes. So the availability of WSNs isguaranteed by avoiding the area attacked.Finally, the paper implements DTMPS protocol in OPNET Modeler Simulation platform, andcompares DTMPS with DM(Disjoint Multi-path) and MTR(Multiple Tree-based Routing) inSwitching performance and energy consumption. The results of the experiment demonstrateDTMPS is a feasible and effective protocol. Conclusion and outlook are made in the end of thepaper as well.更多还原