中文摘要：

MPLS网络中的服务质量组播面临着组播路由状态的可扩展性、服务质量支持困难等瓶颈.针对这些问题,提出一种基于子树共享的新型MPLS服务质量组播方案.本文的贡献有：提出一种组播组到组播分发子树的映射算法,将多个组映射到同一颗子树,以共享的子树为基础构造完整的组播分发树,从而有效地减少MPLS核心网络中的路由状态;将服务质量的考量引入组播分发树的构造过程中,使新的方案能够支持服务质量组播;提出一种简单方便的子树共享实现机制.模拟结果表明,基于子树共享的新型MPLS服务质量组播方案能够有效地减少组播路由状态并提供多种服务质量控制的能力.

英文摘要：

It is hard to provide QoS multicast service in MPLS network because of the state scalability problem,lack of label resources and the difficulty of supporting QoS.In this paper,we provide a new QoS multicast solution based on SubTree sharing.The contribution of this paper contains： a Goup to SubTree Matching algorithm.In this algorithm,multiple groups are mapped into one subtree and the new multicast distribution tree is built based on this subtree.We take QoS into consideration when we build the multicast distribution tree.We provide a new mechanism to implement subtree sharing.By evaluation,our solution can greatly reduce the multicast routing states and provide QoS.