自适应无线Mesh网络组网技术的研究

发布时间：2018-03-30 15:40

本文选题：Mesh网络　切入点：农业物联网　出处：《哈尔滨工业大学》2017年硕士论文

【摘要】：无线Mesh网络(Wireless Mesh Network)也称WMN网络,WMN可以在没有固定的基础设施情况下提供灵活快速的无线数据通讯。WMN不仅对军事战争有重大意义,对农业的应用也是非常广泛,WMN能够快速组建网络实现通讯。而无线Mesh的组网技术和路由协议是当今的两大研究热点。本课题首先从应用环境出发,研究分析了农业物联网的特点和无线Mesh网络的特点,并结合两者之间的联系,提出了基于自适应的农业物联网Mesh拓扑架构。这种结构具有组网灵活,可扩展性高,维护费用低,传输速率高等各方面的良好特点,两者的紧密结合会不断推动农业物联网技术的发展。根据农业物联网的特点,分析了无线Mesh网络常用的路由协议AOMDV,OLSR,HWMP等几种典型协议类型,并选择使用比较适合农业使用的OLSR路由协议,OLSR协议也是比较稳定,使用最广的路由协议,而此协议重点就是对多点中继技术(MPR)的使用,协议在节点数量较大,节点移动速度不高,节点分布分簇化的情况下,在端到端延时,网络负载,传输速率,分组达到率各方面都有很好的性能表现。但同样存在冗余过大,无用消息负载比例过高等缺点,因此本文对MPR算法存在冗余的问题进行了改进,同传统的OLSR路由协议相比较,本文改进了的路由协议能够高效的计算出最小中继节点集,产生更少的无用网络负载,且具有更好的路由能力。NS2仿真结果表明,改进的OLSR协议对网络建立时间,端到端时延,分组到达率,HELLO消息发送数量,TC消息转发数量都有相较大幅度的改进,且达到了更好的网络性能。硬件平台测试结果也证明了改进算法的组网稳定性和组网拓扑的灵活性。
[Abstract]:Wireless Mesh Network, also known as the WMN Network, can provide flexible and fast wireless data communications without a fixed infrastructure. WMN is not only important for military warfare. The application of WMN to agriculture is also very extensive. WMN can set up network quickly to realize communication. However, the networking technology and routing protocol of wireless Mesh are two hot research topics. In this paper, the characteristics of agricultural Internet of things and wireless Mesh network are studied and analyzed. Combined with the relationship between the two, an adaptive topology architecture of agricultural Internet of things (Mesh) is proposed, which has the advantages of flexible networking, high expansibility and low maintenance cost. According to the characteristics of agricultural Internet of things, some typical routing protocols such as AOMDV / OLSR / HWMP, which are commonly used in wireless Mesh network, are analyzed. The OLSR routing protocol, which is more suitable for agricultural use, is also relatively stable and the most widely used routing protocol. The emphasis of this protocol is the use of multi-point relay technology, which has a large number of nodes. In the case of node mobility speed is not high, node distribution clustering, in end-to-end delay, network load, transmission rate, packet achievement rate, all aspects have good performance, but there is also too much redundancy, Therefore, this paper improves the redundancy of MPR algorithm. Compared with the traditional OLSR routing protocol, the improved routing protocol can calculate the minimum relay node set efficiently. The simulation results show that the improved OLSR protocol can improve the network setup time and end-to-end delay. The packet arrival rate and the number of HELLO messages sent and the number of TC messages forwarded have been greatly improved, and better network performance has been achieved. The hardware platform test results also prove the stability of the improved algorithm and the flexibility of the network topology.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5

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