车载通信的网络连通性建模

Connectivity Modeling for Vehicular Communication Networks

车载通信网络是一种高速移动的自组织网络.车辆快速移动导致的网络拓扑结构快速改变和网络的频繁断开,使多跳通信成为挑战,因此车辆的连通性对于研究多跳通信至关重要.为此,从车间时距出发,在合理分析道路交通的情况下,假设车间时距服从爱尔朗分布,速度服从正态分布,从而分析出单位时间内车辆到达数目与平均车辆密度的关系,以及通信距离与车辆连通性之间的关系,建立了一种基于车间时距的车载通信网络连通模型.仿真结果表明,单位时间内车辆到达数目越多,平均车辆密度越大,车辆连通性越好,由此得到车辆的最佳通信距离,从而为今后研究车载通信网络中的数据传输提供一个网络连通模型.

Vehicular communication network is a high-speed mobile Ad-Hoc network（MANET）.Vehicle connectivity is important in studying multi-hop communications,and is a challenge due to rapid changes of topology caused by fast moving of vehicles and frequent disconnection of the network.In this paper,a connectivity model of vehicular communication network based on headway is established based on the point of headway.It is done by reasonably analyzing the traffic,and assuming that the headway follows the Erlang distribution and the speed of vehicles follows normal distribution.The relation between the numbers of arriving vehicles per unit time period and the average vehicle density,that between the range of communication and vehicle connectivity are analyzed.Simulation results show that the more vehicles arrive in a unit time period,the higher the average vehicle density.Consequently,an optimum range of communication can be obtained for good connectivity.The proposed network connectivity model is useful for transmitting data in vehicular communication networks.