快速检测非对称链路的Ad Hoc网络路由协议

发布时间：2018-07-11 21:12

本文选题：Ad + Hoc网络　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：移动Ad Hoc网络是一种没有固定网络拓扑结构、不需要网络管理中心、由移动终端通过无线链路连接而成的自组织、分布式网络。无线网络环境的复杂性和网络设备本身的特性促使非对称链路的产生。在Ad Hoc网络中,按需路由协议大多以链路对称为假设条件,实际的网络中无线设备间的链路会因网络节点的高移动性、网络环境的干扰和传输功率的不同而出现不对称,此时传统的路由协议将不再适用。那么,如何在多跳链路、节点自由移动和无线信号脆弱的情况下为AdHoc网络建立高效路由具有深远的研究意义。本文针对传统的Ad Hoc路由协议不能应用于非对称链路的不足,提出了一种基于路径损耗估计机制来快速检测和高效处理非对称链路的路由协议-AODV-PL。研究的目标是如何在较短的时间内用较低的代价来快速的检测出非对称链路,进而寻找链路稳定度高的传输路径,在兼顾路由性能和网络代价的前提下,提高路径的连通性和稳定性。该协议是对传统的AODV协议的改进,在路由发现阶段利用路径损耗模型预测出链路的非对称特性,同时节点依据链路度量因子选择出稳定性较高的路径。其中链路度量因子综合考虑了节点的接收信号强度、链路维持时间和接收信噪比。网络节点的移动性极有可能导致断链的节点就在断链处的附近或者周边,在路由维护中,将源路由修复与本地节点修复相结合,在一定程度上缩短断链的修复时间,提高链路修复的成功率。最后,对AODV-PL路由协议的性能进行了仿真验证与分析。首先通过调节低功率节点的数目来比较AODV-PL与AODV-Black在数据包的投递率、端到端的时延以及标准化的负载上的不同,得出两种协议在处理非对称链路问题的性能差异。其次,随着网络中节点的数目的增加,比较传统的AODV路由协议与AODV-PL、 AODV-Black路由性能的差异。仿真结果表明,AODV-PL能够很好的解决网络中非对称链路的问题,提高了网络数据的传输率,并且有很强的网络适用性。
[Abstract]:Mobile Ad Hoc networks are self-organized and distributed networks with no fixed network topology, no network management center, and mobile terminals connected by wireless links. The complexity of wireless network environment and the characteristics of network equipment promote asymmetric links. In Ad Hoc networks, the on-demand routing protocols are mostly referred to as link pairs as hypothetical conditions. In actual networks, the links between wireless devices will be asymmetric due to the high mobility of network nodes, the interference of network environment and the difference of transmission power. At this point, the traditional routing protocol will no longer apply. Therefore, how to establish efficient routing for Ad Hoc networks with multi-hop links, free mobility of nodes and fragile wireless signals has profound significance. Aiming at the disadvantage that the traditional Ad Hoc routing protocol can not be applied to asymmetric links, this paper proposes a routing protocol, AODV-PLV-PLV, which is based on path loss estimation mechanism to detect and process asymmetric links quickly and efficiently. The goal of the research is how to quickly detect asymmetric links in a short time at a lower cost, and then find the transmission path with high link stability, taking into account both routing performance and network cost. Improve the connectivity and stability of the path. This protocol is an improvement on the traditional AODV protocol. In the phase of route discovery, the path loss model is used to predict the asymmetric characteristics of the link, and the node selects the stable path according to the link metric factor. The link metric factor takes into account the received signal strength, link maintenance time and reception signal to noise ratio (SNR). The mobility of the network node is likely to lead to the broken node near or around the broken chain. In the route maintenance, the source route repair and the local node repair are combined to shorten the repair time of the broken chain to a certain extent. Improve the success rate of link repair. Finally, the performance of AODV-PL routing protocol is simulated and analyzed. First, by adjusting the number of low-power nodes, the differences between AODV-PL and AODV-Black in packet delivery rate, end-to-end delay and standardized load are compared, and the performance differences between the two protocols in dealing with asymmetric link problems are obtained. Secondly, with the increase of the number of nodes in the network, the performance differences between the traditional AODV routing protocol and AODV-PLand AODV-Black routing protocol are compared. The simulation results show that AODV-PL can solve the problem of asymmetric link in the network, improve the transmission rate of network data, and have strong applicability.
【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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