Research Of Application Layer Multicast Model Based On Hybrid Ring-bus Architecture

With the coming of Internet era, the demand for online multimedia applications from people is increasing day by day. And more multicast technologies will be required to meet the demand of this kind of applications. The realization of traditional IP multicast technology is due to the convenience provided by routing equipments on the network layer. Faced with a series of technical and commercial problems, IP multicast cannot be widely used on Internet even though it has a history of more than 20 years. So Application Layer Multicast (ALM) was raised against the defects of IP multicast. Compared with IP multicast, ALM can realize its function just through collaboration between terminals, so it has a brilliant prospect.At the same time, a lot of domestic and foreign relevant research shows that there are still many problems in ALM need to be resolved. For example, how to reduce the control overhead, and how to improve the efficiency of multicast data transmission, etc. It’s important to study and solve these above problems, because it helps to promote the development of ALM technology.On the basis of relevant research results at home and abroad, compared with the existing ALM model, this paper proposed a new multicast model named MHRB (Model based on Hybrid Ring-bus Architecture). The unique hybrid Ring-bus structure adopted by MHRB, can effectively integrate the advantages of the above two topology structure. As a result, it not only reduces the overhead but also improves the data transfer rate; The introduction of dynamic priority can adjust every node’s position in system according to the real-time priority. As a result it improves the resource utilization; The diff-service data transmission mechanism adopted by MHRB, can automatically choose different data transfer strategies for different services. Simulation results show that not only in real-time but also in non real-time scenario, MHRB has a higher average data transfer ratio and a lower control overhead. So in a word, MHRB has a good application prospect.