中文摘要：

研究了QoS覆盖多播路由问题，对度约束模型进行扩展，提出了一个新的支持QoS路南的覆盖多播网络模型．基于此模型，提出丁一个新的QoS覆盖多播路南协议QOS覆盖多播树协议（QOMTP）．该协议采用分布式和树优先的策略，使多播组成员之间能自组织地构建一棵基于源的、满足QoS约束的覆盖多播树．该协议采用了一种新的启发式局部优化算法，通过调节启发因子，能灵活地在延时和带宽之间进行均衡．仿真实验表明，采用按请求带宽转发媒体流，并选择适当的启发因子，QOMTP协议能减少多播树上节点的网络资源占用越，同时获得较高的节点接纳率和较好的动态适心性，从而证明了该协议机制及其算法的有效性．

英文摘要：

The QoS routing problem in overlay multicast is studied, by extending the degreeconstrained model, a new overlay multicast network model supporting QoS routing is presented. Based on this model, a new QoS overlay multicast routing protocol called QoS-aware Overlay Muhicast Tree Protocol （QOMTP） is proposed. Adopting distributed and tree-first strategies, the protocol enables members of a multicast group to self-organize into a sourced based overlay muhlcast tree satisfying QoS constraints. QOMTP used a new heuristic local optimum algorithm, which can make trade-off between delay and bandwidth of routing flexibly by adjusting a heuristic parameter. The simulation results show that QOMTP could reduce the network resource usage of members on the tree as well as achieve a higher admission rate of members and better dynamic adaptability efficiently, while distributing multimedia according to the required bandwidth and choosing a proper value of the heuristic parameter.