摘要
Ad Hoc网络节点的移动导致网络拓扑结构的变化.为了评估网络拓扑结构的变化特性,需要引入合适的衡量指标.基于此,定义了网络拓扑生存时间,并提出一种计算网络拓扑生存时间的方法.介绍了Random Direction运动模型,并在NS2中对该模型进行仿真,通过多次实验得到其拓扑生存时间的数据.通过对仿真数据的拟合,发现网络拓扑生存时间服从对数正态分布,并分别分析了其分布与节点最大运动速度、最接近通信半径节点对之间的距离的关系.这些结论为实际的Ad Hoc网络性能的评价以及路由协议的改进提供了一定的参考.
The Topology of Ad Hoc network changes with the moving of nodes.To evaluate the variation of the network Topology,appropriate measure should be introduced.In this paper,Topology Lifetime(TLT) is defined as a measure to evluate the variation of the network Topology,and a method for calculating the Topology Lifetime(TLT) is proposed for Random Direction model.Moreover,simulation is conducted for this model by NS2,its Topology Lifetime is obtained by multiple experiments.By curve fitting,the results show that probability density function of Topology Lifetime obey Lognormal distribution.Then the relationships of the distribution with maximum node velocity,and the nearest distance to the communication radius,are analyzed respectively.The conclusions in this paper can provide some guidelines for performance evaluation and improving routing protocol of Ad Hoc network.
出处
《小型微型计算机系统》
CSCD
北大核心
2013年第3期563-566,共4页
Journal of Chinese Computer Systems
