中文摘要：

车栽网中车辆的高速移动导致链路的生命期短，为了提高数据包的投递率，设计了一种基于分簇和多播树的地理多播路由协议。该协议将整个车载网中的车辆进行分簇，以多个车辆组成的簇为数据包中转站，簇内车辆协同转发一个数据包，数据包再由一个簇转发到另一个簇，最后到达目的区域。由于簇的稳定性，这个数据包投递成功的概率将显著增加。通过仿真实验与现有协议进行比较，验证了该协议具有更高的数据包投递率。

英文摘要：

The high speed of mobile vehicles in vehicular ad-hoc networks leads to a short life span link between two vehicles. In order to improve the packet delivery rate, a geoeast routing protocol is proposed based on cluster and tree. This protocol divides vehicles in vehicular ad-hoc networks into clusters. A cluster which consists of several vehicles becomes a data packet transfer station. Vehicles in a cluster coordinate with each other to forward a packet. Then packets are forwarded from one cluster to another cluster and finally reach the destination region. Due to the stability of the cluster, the packet delivery rate will be increased significantly. Compared with existing agreements now through simulation experiment, this protocol shows a higher packet delivery ratio.