关键词: 车载自组织网络, 贪婪的周边无状态路由, 方向转发

Abstract: This paper proposes a routing protocol that incorporates greedy forwarding and directional forwarding based on geographical position called，GDGP.The position information of the destination nodes stored on every node could be updated through two independent message interactive mechanisms，which makes sure of the consistency of the position information recorded on every node.This further ensures the reliability of the routing algorithm.The performance of GPSR and GDGP is compared by using network simulator NS-2 with the actual node movement model.The simulation results show that the improved routing protocol has a better performance in city scenes.

Key words: vehicular Ad hoc networks, greedy perimeter stateless routing, directional forward