Based On The Degree Constraint Application Level Multicast System

In recent years, in order to ease the bottleneck of network bandwidth, application-level multicast technology is receiving increasing attention. However, in order to design cost-effective application-level multicast system is also facing new challenges, researchers need to consider many different network layer. In previous studies, a neglected but it is equally important factor is the host of capacity constraints, previous studies did not consider the basic host of limited capacity, that the hosts have sufficient capacity (that is, with any number of host connectivity) . But this is not the case, the host can be connected directly to the number of neighbors is always limited. If we do not consider the host's capacity constraints, it is possible to make a node to connect too many neighbors, in order to host the Department have a bottleneck, resulting in performance Multicast as a whole has dropped drastically.To that end, this paper proposes a new application layer multicast algorithm with degree-constrain function. Using the available bandwidth, the percentage of CPU occupied, the available memory and the number of processes of an end system, we define a function to compute the connection capacity of it. The capacity is defined as the degree of the end system. Then, we integrate the function into a specific-source tree application layer multicast algorithm to create a new algorithm with degree-constrain function. By means of the new algorithm, we can produce a multicast overlay network with better performance. That is to say the multicast traffic load can be more easily balanced within the tree. With Java kit, we also develop a multicast communication prototype using the proposed algorithm and have tested its performance.We are in the local area network system for the repeated tests, experiments show restraint and excessive compared with the same multicast algorithm. The experimental results demonstrate that the new algorithm can reduce the impact of the end systems to the multicast tree, make the average transmission delay shorter and increase the throughput of the multicast tree.