车载网中基于分段与协作的MAC协议  

Segmentation and Cooperation Based Media Access Control Protocol in VANETs

作　　者：于明鹭 刘南杰[1,2] 赵海涛[1,2] 

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]南京邮电大学网络基因工程研究所,江苏南京210003

出　　处：《计算机技术与发展》2016年第3期80-84,共5页Computer Technology and Development

基　　金：国家"973"重点基础研究发展计划项目(2013CB329005);国家自然科学基金资助项目(61302100);教育部博士点基金资助项目(20133223120002);南京邮电大学科研基金(NY211006)

摘　　要：车载自组织网络中采用的是基于竞争的MAC协议。该协议在车辆密度很大时会导致很高的包碰撞率,严重影响安全消息的传输可靠性和时延。针对该问题,提出车载自组织网络中基于分段与协作的MAC协议。首先创新性提出一种对道路进行分段的思想,再通过段首分配时隙给每辆车传输安全消息,最后通过选择辅助节点在空闲时隙重传紧急消息给接收失败的节点。该协议有助于提高安全消息的传输可靠性并降低消息传输时延。Vehicular Ad-hoc NETworks （VANETs） employs contention-based Medium Access Control （MAC）. Under high-density situation, it leads to a great number of packet collision, and as a result, the reliability and latency of safety messages are severely affected. A segmentation and cooperation based MAC protocol in VANETs is proposed. It first introduces a road segmentation strategy, then the selected segment header is responsible to decide slots allocation which is used to transmit safety message by every car. Finally, helpers are selected to forward the packet to nodes that don＇ t receive the packet in idle slots. The protocol can help to improve safety message＇ s transmission reliability and reduce transmission delay.

关 键 词：车载自组织网络 协作 安全消息 介质访问控制协议 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]