A Sender-Driven Clustering Algorithm of Layer Rate Dynamic Allocating in Layered Multicast

Layered multicast has been proposed as a solution to video multicast over Internet. Existing multicast protocols usually perform layer adaptation at the receiver´s side, using static layer rate allocation techniques at the sender´s side. In this paper, the basic theory of layered multicast was introduced firstly. The technology of dynamic sender-driven rate allocation was discussed. Especially, a clustering algorithm of layer rate allocation based on different receiver´s bandwidth, SCRA, was brought forward. Subsequently, the implement of SCRA algorithm was presented. Finally, SCRA algorithm was simulated in specific network environment. The results of simulation were compared with other algorithms, such as GAU and SLM. The results show the multimedia multicast system adopting SCRA algorithm can gain high throughput with more simple algorithm framework.