WMN中节点部署算法和网关自适应的设计与实现

发布时间：2018-05-08 06:21

本文选题：无线Mesh网络 + 节点设备部署　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：无线Mesh网络(Wireless Mesh Network)是一种典型的拥有自组织、自愈合特点的宽带无线分布式多跳网络。作为一种新型的网络架构,WMN在可靠性、扩展性以及灵活性等多方面相比较传统网络而言具备很大的优势。面对日益广泛的无线形式网络需求,在WMN的规划部署阶段中面对无线链路复杂多变的特性,节点部署位置的选择对网络拓扑结构、性能和建造成本等有着直接且重要的影响。但是目前却缺少一种与LQMP(Link Quality Mesh Protocol)路由协议相结合的WMN工程节点部署选择的指导方法。因此迫切需求一种实际可靠的链路质量评价机制及其质量显示方案来指导工程部署中节点位置的选择。另外,当某一网关设备节点出现故障时节点还需及时做出自适应故障处理,以保证整个部署网络的健壮性,从而提升用户网络体验。为此,本文从测试部署之中遇到的实际问题出发,主要研究无线Mesh网络中节点部署的位置选择问题和网关节点设备容错性问题。文中首先提出了一种基于LQMP路由协议的改进的无线链路质量评价机制,该机制结合了路由协议理论研究和实际测试经验,通过提取节点缓存队列长度、数据传输平均延迟、丢包率以及邻居节点信号强度等参数传递给路由协议形成补充的路由判据,为不同的数据传输需求选择对应的最佳下一跳无线链路,从而更快更好地指导WMN部署工程中节点位置的选择；然后,本文针对网关节点故障(如网线断线)修复的问题,结合了路由协议的研究,实现了一种节点自适应切换工作模式的机制。该机制通过定时检测自身实际工作能力,根据检测结果自适应地切换自身工作模式为ServerNode模式或者NormalNode模式,保证终端用户不因网关设备故障问题而失去网络连接。本文完成了工程部署暴露问题的改进方案的详细设计与实现,并进行了实际测试。测试结果表明,文中提出的链路质量评价机制能够在不明显增加背景数据流的前提下,在一定程度上提高无线链路的可信度,能够为无线Mesh网络的测试部署提供更高效、更直接的节点位置选择指导。文中提出的自适应工作模式切换机制能够在设计考虑的故障因素发生时自动完成模式切换,提升了部署的无线Mesh网络的健壮性。
[Abstract]:Wireless Mesh Network (Wireless Mesh Network) is a typical wideband wireless distributed multi-hop network with the characteristics of self-organization and self-healing. As a new network architecture, WMN has great advantages over traditional networks in many aspects, such as reliability, expansibility and flexibility. In the face of the increasingly extensive demands of wireless networks and the complex and changeable characteristics of wireless links in the planning and deployment phase of WMN, the selection of node deployment locations has a direct and important impact on the network topology, performance and construction costs. However, there is a lack of a method to guide the deployment of WMN project nodes combined with LQMP(Link Quality Mesh protocol. Therefore, a practical and reliable link quality evaluation mechanism and its quality display scheme are urgently needed to guide the selection of node positions in engineering deployment. In addition, when a gateway device node fails, the node also needs to make adaptive fault processing in time to ensure the robustness of the entire deployment network, thereby improving the user network experience. Therefore, starting from the practical problems encountered in the test deployment, this paper mainly studies the location selection problem of node deployment in wireless Mesh network and the fault tolerance problem of gateway node equipment. In this paper, an improved wireless link quality evaluation mechanism based on LQMP routing protocol is proposed. The mechanism combines the theoretical research of routing protocol and practical testing experience. By extracting the queue length of the node cache, the average delay of data transmission is obtained. The parameters such as packet loss rate and neighbor node signal intensity are passed to the routing protocol to form a supplementary routing criterion, and the optimal next-hop wireless link is selected for different data transmission requirements. In order to guide the selection of node location in WMN deployment project faster and better. Then, this paper combines the research of routing protocol to solve the problem of node fault repair (such as network wire breakage). A mechanism of node adaptive switching operation mode is implemented. According to the detection results, the mechanism adaptively switches its working mode to ServerNode mode or NormalNode mode, so as to ensure that the end user does not lose the network connection due to the failure of the gateway equipment. In this paper, the detailed design and implementation of the improved scheme of engineering deployment exposure problem are completed, and the actual test is carried out. The test results show that the proposed link quality evaluation mechanism can improve the reliability of wireless link to a certain extent without significantly increasing the background data flow, and can provide more efficient test deployment for wireless Mesh networks. More direct node location selection guide. The adaptive mode switching mechanism proposed in this paper can automatically complete the mode switching when the fault factors are considered in the design, which improves the robustness of the deployed wireless Mesh networks.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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