交通密度自适应的VANET广播协议  

A traffic flow density adaptive broadcast protocol for VANETs

作　　者：周连科[1] 崔刚[1] 刘宏伟[1] 左德承[1] 

机构地区：[1]哈尔滨工业大学计算机科学与技术学院,哈尔滨150001

出　　处：《高技术通讯》2012年第4期355-362,共8页Chinese High Technology Letters

基　　金：863计划（2008AA01A204）资助项目.

摘　　要：为了实现车用自组织网络（VANET）在交通流实时变化的场景下对安全信息的快速、有效广播，提出了一种能够适应交通流密度变化的VANET广播协议——交通密度自适应广播协议（TDABP）。该协议针对VANET环境的特点，采用了基于节点覆盖信息的分布式广播策略，采取按需交换邻节点覆盖信息的方式来选择转发节点，有效地降低了更新邻节点信息的通信开销、减小了广播风暴的影响，使广播通信不受节点密度的影响，能够适应道路交通中交通流不断变化的VANET广播场景。理论分析和仿真实验结果表明，该VANET广播协议能够满足VANET广播的可靠性和实时性要求，能够适应交通流引起的节点密度变化，具有良好的可扩展性和较高的广播效率。A traffic density adaptive broadcast protocol（TDABP） for vehicular ad hoc networks （VANETs） is proposed to realize their fast, effective broadcasting of safety messages in a traffic environment with the variable traffic flow density to enhance the road traffic safety. The protocol is designed as a distributed scheme to cater with the characteristics of VANET environments, in which it is difficult for every node to master the topologies of whole networks. An on-demand mechanism is employed in exchanging connectivity information between neighbors to get their coverage information. Consequently, the additional overhead for updating neighbor knowledge is reduced and the effects of broadcast storm are relieved efficiently at different density scenarios. The theoretical analysis and simulation experi- ments show that this protocol can meet the real-time performance and reliability requirements of VANET broadcast- ing in variable density traffic flow conditions. The protocol gains good scalability and high efficiency.

关 键 词：移动自组网 车用自组织网络(VANET) 广播协议 节点覆盖 交通流密度 

分 类 号：TP273.2[自动化与计算机技术—检测技术与自动化装置]