基于城市车载自组织网络中传输质量的自适应地理路由协议

An Adaptive Quality of Transmission Based Geographic Routing Protocol under Urban VANETs

车载自组织网络(VANET)一直以来受到越来越多的关注。然而,VANET的固有特性,如节点的高移动性、频繁变化的拓扑,在复杂的城市环境中为设计高效的路由协议提出了许多挑战。提出基于城市车辆网络(AGQOT)传输质量的自适应地理路由协议,作为道路路段的选择指导,一种称为传输质量(QOT)的度量被设计用来测量每个路段的性能,将路由连通性与分组传送率(PDR)相结合。在这种度量的帮助下,道路段可以逐个动态地选择,以构成最佳路由路径,避免局部最大和数据拥塞问题。提出一种改进的贪婪转发策略,使数据包沿着选定的路段转发,保证数据包传输的快速可靠。仿真结果表明,提出的协议可以提高网络在分组传输率和端到端延迟方面的性能。

Vehicular Ad Hoc Networks(VANETs)have been attracting more and more attention.However,due to high mobility of nodes,frequent changing topology,there are many challenges for designing an efficient routing protocol in complex urban vehicular environment.In this paper,we propose an adaptive quality of transmission based geographical routing for urban vehicular networks(AGQOT).As the selection guidance of road segments,we first devise a novel metric named as quality of transmission(QOT)to measure the performance of road segments with the combination of the connectivity and packet delivery ratio(PDR).By using the metric,each road segment can be dynamically selected one by one to comprise the best routing path,alleviating the local maximum and data congestion.An improved forwarding scheme is further proposed to forward the packet along the selected road segment,guaranteeing the fast and reliable data transmission.A series of extensive simulation results show that the protocol proposed can improve the network in terms of packet delivery ratio and end-to-end delay.