RM-AODV路径选择协议是IEEE 802.11s标准中HWMP路由选择协议的基础。不同于传统AODV协议在第3层使用IP地址路由和跳数作为路由metric,RM-AODV工作在第2层使用MAC地址和空时metric进行路径选择。为了适应无线mesh网络流量呈树状汇聚的特点,IEEE 802.11s标准还对RM-AODV进行树状先验式扩展。在典型无线mesh网络拓扑中通过仿真对RM-AODV的路径发现时间进行研究,进一步分析相对根节点的不同位置对路径发现时间的影响。 The RM-AODV Path Selection Protocol is the basis of the HWMP routing protocol in the IEEE 802.11s standard. Unlike traditional AODV protocols that use IP address routing and hop counts as route metric at Layer 3, RM-AODV works at Layer 2 using MAC address and space-time metric for path selection. In order to adapt to the wireless mesh network traffic is characterized by tree-like convergence, IEEE 802.11s standard RM-AODV tree priori expansion. In a typical wireless mesh network topology, the path-finding time of RM-AODV is studied by simulation, and further the influence of different relative root nodes on path discovery time is analyzed.