智能城市车载网络分层分区协作通信模型研究

城市车载网络能为解决城市交通问题提供有效的方法.大多数已存在的传输模型由于不能解决车辆的高速移动、复杂城市交通环境和多变的交通密度问题,导致传输效率低、可靠性能差.该文紧紧围绕城市环境信号传输衰减、红灯等停、固定和周期的公交运行模式,提出分层分区的通信模型.该模型充分利用公交的固定路线运行和普通车辆与公交之间的簇首节点转发策略进行优化,将车辆之间复杂的不确定的传输协议转换成协作的、稳定的3层模型.设计了有限时延内的单跳转发机制,以保证公交协助转发的可靠性和有效性; 设计了簇首触发转发机制以适应不同的车辆密度.仿真实验表明,整体模型具有较高的传输效率和较低的时延,且对于具有高移动性和复杂道路环境的城市车载网络具有较好的适应性.

Research on Layered-Partition Communication Model on Intelligent Urban VANET

Urban VANETs as an important part of intelligent transportation in the future,provides an effective solution to solve the city traffic problem.Most of the existing transmission schemes have low performance on efficiency and reliability,because they can’t solve the problems of high speed mobile vehicle,complex urban traffic environment and different traffic density.The text follows the urban environment of signal propagation,stopped on red,fixed and cycled bus movement,proposing layered-partition communication model.The model transfers the complex and uncertain transmission protocol between the vehicles to collaborative and certain three layered,which taking advantages of the fixed trace of bus and using the cluster head strategy to optimize communication between ordinary vehicles and buses.single hop selection mechanism according to the signal propagation attenuation model and vehicle mobility model is designed,and mechanism of multi hop forwarding in delay probability,which can ensure the reliable and efficiency on bus-assistant forwarding.On the other hand,cluster head trigger strategy which can adapt to the vehicle density is designed.The simulation results show that,the whole scheme can achieve good data delivery and low delay,which has good adaptability on high dynamic and special road situation of urban VANET.