Abstract: Multimedia routing technology with its advantage of saving bandwidth，has received a great deal interest in the field of wireless multimedia network QoS.PIM-SM is currently the preferred intra-domain multicast routing protocol.In this paper，IEEE802.11 LAN experiments are made by using OPNET simulation environment.Firstly，by comparing unicast routing with multicast routing on throughput，it shows the advantage of multicast on bandwidth; then the models of four multimedia services，including database，file transfer，VoIP and video conference，are respectively established with unicast routing and PIM-SM，and the analysis of simulation result on delay，jitter and loss ratio are given.The experiments give a good reference for building real wireless multimedia network.

摘要： 多播路由技术凭借其有效节省网络带宽的优势，已成为研究无线多媒体网络服务质量（QoS）的热点内容。其中协议独立多播稀疏模式（PIM-SM）是域内多播路由协议中常见的协议。使用OPNET平台进行基于IEEE802.11无线局域网的仿真实验，首先对单播路由和PIM-SM多播路由在吞吐量上进行比较，实验结果表明多播路由在带宽的利用率上具有明显的优势。然后对文件传输、数据库访问、网络电话和视频会议等多媒体业务，进行单播路由和PIM-SM多播路由对比仿真实验，并且从延迟、延迟抖动和丢包率等方面给出结论，为真实无线多媒体网络环境的搭建提供一个很好的参考。