中文摘要：

低地球轨道（Low Earth Orbit，LEO）卫星系统因能够提供多媒体通信服务而成为卫星通信研究的热点．有效的路由算法设计是LEO卫星网络中的一个关键问题．为了满足多媒体应用的服务质量（Quality of Service，QoS）要求，卫星的路由算法应当考虑切换的影响．文章提出了一种基于启发式蚂蚁算法的分布式的QoS路由策略，可以满足延时限制，同时避免链路拥塞．仿真结果显示在不同的延时限制条件下，相对于最短路径优先算法，该算法具有较低的呼叫阻塞概率．

英文摘要：

Low Earth Orbit（LEO） satellites can provide multimedia service and are becoming increasingly important. One of the challenges in LEO satellite networks is the development of specialized and efficient routing algorithms. To satisfy the QoS requirements of multimedia applications, satellite routing protocols should consider handovers and minimize their effect on the active connections. A distributed QoS routing scheme based on heuristic ant algorithm is proposed for satisfying delay bound and avoiding link congestion. Simulation results show that the call blocking probabilities of this algorithm are less than that of shortest path first （SPF） with different delay bound.