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Research on Construct, Maintenance and Forwarding Policy of Minimum Delay Tree for Application Level Multicast

Author: DuZhengJun
Tutor: ShaJiChang
School: National University of Defense Science and Technology
Course: Management Science and Engineering
Keywords: Application Layer Multicast Minimum delay multicast tree Multicast tree generation Multicast tree maintenance Forwarding policy
CLC: TP393.02
Type: Master's thesis
Year: 2008
Downloads: 82
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Abstract


IP Multicast difficult to deploy on the Internet , researchers proposed application layer multicast . The application layer multicast multicast related functions at the end hosts , to achieve multicast services at the application layer . Copy forwarding work time consumed due to the limited processing power and bandwidth of end hosts , multicast process is relatively long, resulting in application layer multicast delay ; and end hosts are likely to fail or leave a multicast group , resulting in a multicast tree split , affecting downstream node receives data . Application layer multicast delay multicast tree divisive issue paper in order to optimize the delay for the goal of application layer multicast tree formation , maintenance, and forwarding of multicast nodes strategy . The main contents of this article and innovations are as follows : First, the analysis of the factors that affect the delay in the application layer multicast , including the link communication delay , node degree and node forwarding capability . Propose a new model DNMD, improved on the basis of minimum delay in the application layer multicast tree model DCMD DCMD model does not consider the lack of the nodes forwarding capacity differences , and genetic algorithm to solve the model . Programming algorithm in MATLAB environment simulation test and verify the effectiveness of the algorithm and rationality of the model . Secondly, the application layer multicast tree maintenance issues , including the splitting of multicast tree recovery and new nodes join . Learn ROT recovery algorithm thinking a mixed recovery strategy to optimize the delay as the goal to restore the multicast tree , take a different recovery strategies based on node status differences ; problems for the new node to add a node to the root delay minimum target finding the right add location . Finally, a multicast data node forwarding policy , its child nodes forwarding by reasonable arrangements multicast node delay data in order to optimize the multicast tree . Derived proved the multicast nodes forwarding data in accordance with the policy , the minimum delay of the multicast tree . With an instance of the specific application of the strategy , and simulation , to verify the effectiveness of the strategy in the MATLAB environment .

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