【摘要】 为了支持组成员的异构性和动态性,满足组成员不同的带宽和时延约束要求,提出了支持QoS的流式分层数据传输的动态组播路由算法(简称:QDMR-LD).当新的组成员加入时,使用面向接收者的启发式搜索方法找到一条位于组播树和组成员之间的可行的并具有最小代价的路径.为了提高组成员的加入成功率,采用了以前工作中提出的RBMF 转发算法.当组成员离开时,位于组播树上多余的部分将被剪裁.仿真结果表明,与其他相关工作相比,QDMR-LD在提高了加入成功率的同时,降低了组播树的代价.更多还原

【Abstract】 To support different QoS requirements in terms of bandwidth and delay constraints imposed by heterogeneous and dynamic joining receivers, this paper proposes an algorithm named QDMR-LD (QoS-based dynamic multicast routing for streaming layered data). When a new receiver joins, receiver-oriented path searching heuristic is used to find a feasible path with minimum cost from the multicast tree to the receiver. RBMF (reverse best metric forwarding) mode proposed in our previous work is adopted in this paper to increase the joining success ratio. When a receiver leaves, corresponding part of the multicast tree is pruned. Simulation results show that QDMR-LD increases the success ratio and lowers the multicast tree cost compared with other related schemes.更多还原