城市车联网中公交VANET的连通性估算方法  

A connectivity estimation method for bus-VANET of urban connected vehicle

作　　者：林盈盈 董红召[1] 郝伟娜[1] LIN Yingying;DONG Hongzhao;HAO Weina(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310014;Department of Engineering,Zhejiang Open University,Hangzhou 310014)

机构地区：[1]浙江工业大学机械工程学院,杭州310014 [2]浙江开放大学工程教研部,杭州310014

出　　处：《高技术通讯》2022年第10期1017-1024,共8页Chinese High Technology Letters

基　　金：国家自然科学基金(61773347);浙江省基础公益研究计划项目(LGF20F030001);浙江省自然科学基金(LY19E050008)资助项目。

摘　　要：针对城市车联网中以公交车作为辅助中继节点的公交车载自组织网络(VANET)通信性能估算问题,提出了公交VANET网络连通概率模型来估算VANET的连通性、传输延时和连通延续时间。该模型根据区域车辆密度表征城市车流的间歇性中断特点,在分析天线高度和公交专用道对公交车通信能力和行驶规律的影响基础上,采用双斜率路径损耗模型和概率分析方法,按是否含有公交车节点分别建立道路上任意两车的直接连通关系,然后对公交专用道措施和公交车借助异构网络构成移动骨干网策略下公交VANET的通信性能进行估算分析。仿真结果显示公交VANET在低区域车流密度和远距离传输时的网络连通概率明显高于无公交车场景,且在车道数量较少以及公交车发车间隔较小时,改善效果更显著,此外,公交VANET传输延时和网络拓扑稳定性也有改善。To estimate the communication performance including connectivity,transmission delay and communication duration of vehicular ad-hoc network(VANET)with bus as auxiliary relay node in urban connected vehicle,a connection probability model of bus-VANET is presented.The regional vehicle density is used to represent the intermittent interruption characteristics of urban traffic flow,the influence of antenna height and dedicated bus lane strategy on bus communication ability and driving law is considered,the dual-slope path loss model and probability analysis method are cited,the direct connection relationship between any two vehicles is established according to whether a bus node is included.Then,the communication performance under the strategy of dedicated bus lane and the measure that uses buses to construct the mobile backbone network with the help of heterogeneous network is analyzed.The simulation results show that the connection probability of bus-VANET under low regional traffic density and longnode-distance is significantly higher than that in no bus scenario,especially when the number of lanes is small or the bus departure interval is small,and the transmission delay and topology stability have also been improved.

关 键 词：智能交通 连通性 双斜率路径损耗模型 间歇性车流 公交车载自组织网络(VANET) 公交专用道 

分 类 号：TN929.5[电子电信—通信与信息系统] U495[电子电信—信息与通信工程]