中文摘要：

路由协议执行网络拓扑描述、路由选择和数据包转发的功能，影响整个网络的性能和存活时间。现有的路由协议需要发送大量数据包维护网络拓扑，以及大量的存储空间来存储路由条目。由于硬件的限制，无线传感器节点无论是能量，还是其处理能力、存储能力都受到极大的制约。因此，IETFRoLL工作组提出了一种针对低功耗有损网络的IPV6路由协议，即RPL路由协议。文中对RPL路由协议的拓扑构建过程、数据包路由过程和Trickle定时器的算法等进行了分析，通过使用COOJA仿真工具对其进行仿真，验证了RPL路由协议在低功耗有损网络中具有较高的性能。

英文摘要：

Roaring protocol implements the description of network topology, routing path selection and data packets forwarding, which influences the performance and alive time of the entire network. Existing routing protocols require a large amount of messages to maintain network topology, as well as large storage space to keep routing entries. Due to the constraints of hardware, the energy and the ability of processing, also the storing of wireless sensor network nodes has been dramatically limited. Hence, the IETF routing over low-power and lossy networks{ ROLL） working group has recently proposed the IPv6 routing protocol for low power and lossy networks, i.e. , the RPL protocol. In this paper, the topology building process and data packets routing process, also the Trickle timer algorithm of RPL rou- ting protocol is analyzed. It has been simulated by COOJA, which clearly shows that RPL routing protocol plays a beneficial and reward- ing role in low-power and lossy networks.