中文摘要：

车辆自组织网络是传统自组织网络派生出的一个分支,其与应用场景高度相关.传统路由协议不能有效的适用于车辆自组织网络,因此,针对车辆自组织网络提出了许多新的路由协议.首先在总结车辆自组织网络的特性后,分别介绍了单播路由、广播路由和地域性多播路由的概念,然后着重分析和总结了近年来具有代表性的路由协议的核心路由机制及其优缺点,并从路由协议的应用场景、分类、特性和前提条件四个方面对这些路由协议进行全面的比较.最后,指出了理想的路由协议应具有的特性以及未来可能的研究策略与突破方向.

英文摘要：

Vehicle ad hoc networks（VANETs） which depend on special application scenarios are different from mobile ad hoc networks（MANETs）.The existing routing protocols of MANETs cannot be applied to VANETs effectively.Many new routing protocols are presented for VANETs.Firstly,we describe the characteristic features of VANETs,then introduce the conceptions of unicast routing,broadcast routing and geocast routing.Moreover,we classify and characterize the existing representative routing protocols for VANETs,and also discuss their advantages and disadvantages.We give a qualitative comparison of these routing protocols with respect to application scenarios,classification methodology,characteristic features and assumptions involved.Finally,the important features that ideal routing protocols possess are summarized,and open research issues and possible directions of future research related to VANETs routing are proposed.