ROGR:基于定向道路的地理位置路由

ROGR: Road-oriented Geographic Routing in Vehicle Ad Hoc Networks

地理位置路由协议被广泛应用于车载网络VANETs(vehicle Ad Hoc networks),然而在真实的城市场景中,由于复杂的道路拓扑和车辆移动,网络拓扑呈动态变化,给地理位置路由协议提出了挑战。传统的基于定向节点地理位置路由遭受可达性和可扩展性的折衷问题。为此,提出面向VANETs城市场景基于定向道路的地理位置路由ROGR(road-oriented geographic routing)协议。ROGR协议利用道路数字地图信息,并结合了基于源节点转发和基于接收节点转发机制。在每一跳中,利用数字地图信息和周期的beacon包,源节点计算各路段的权值;并选择具有最大权值的路段作为数据包传输路段,再将该路段上的车辆作为下一跳转发节点的候选节点。然后,这些候选节点利用基于退避时延机制竞争转发数据包。仿真结果表明,提出的ROGR协议具有好的可达性和可扩展性。

Geographic routing protocols have been developed in vehicular Ad Hoc networks( VANETs). However,in more realistic urban environments,vehicular networks are highly dynamic due to the complicated road topology and vehicular mobility,and existing approaches tackle challenges in urban environments such as dynamic vehicular network topology. Therefore,traditional protocols based on the node oriented approach could not be robust in such environments and suffer the trade-off between reachability and scalability. A road-oriented geographic routing( ROGR) protocol Urban VANETs was proposed. It integrates the sender based forwarder suppression and receiver-based opportunistic forwarding by exploiting road map information as well as vehicular connectivity. At each hop,a sender roughly assigns a group of next-hop forwarders by selecting a next-hop road segment with help of road map information and periodical beacon messages. Each receiver located on the selected road segment contends for the right to forward the received packet with a delay-based contention algorithm. The simulation results show that the proposed ROGR has good routing performance in terms of reachability and scalability.