一种延时约束费用最小分布式动态组播路由算法

多媒体应用一般包含多个组播成员,它消耗大量的网络资源且有严格的端端延时约束.针对这个问题,提出了一种延时约束费用最小的分布式动态组播路由启发算法DDDDCLCMR(distributeddynamicdelay-constrainedleast-costmulticastroutingalgorithm).在DDDDCLCMR算法中,组播源点很少或根本不参与路由计算;即使组播成员发生改变,组播树变化也很小,算法扩展性好.实验结果表明，无论组播成员改变与否,DDDCLCMR算法都能获得满足延时约束且费用很低的组播树.

A Distributed Dynamic Delay-Constrained Lea st-Cost Multicast Routing Heuristic

Many new distributed multimedia applications involve dynamic multiple participan ts, have stringent end-to-end delay requirement and consume large amount of ne twork resources. In this paper, a new DDDCLCMR (distributed dynamic delay-const rained least-cost multicast routing algorithm) is proposed to support these app lications. DDDCLCMR scales well because the source of the multicast tree needs o nly limited computation or may even not be involved in the route computation. Wh en group membership changes, the existing multicast tree is perturbed as little as possible. Simulation results show that DDDCLCMR performs very well in terms o f delay and cost for both static and dynamic multicast groups, compared with the best multicast algorithms known.