spaper21_slides - Reliable Application Layer Multicast Over...

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Reliable Application Layer Multicast Over Combined Wired and Wireless Networks By Anuj Shroff Nahush Chaturvedi
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PROBLEM DESCRIPTION Providing reliable multimedia streaming services from a single server to multiple clients over heterogenous networks. A Heterogenous Network is a combination of both wired and wireless networks. Wireless networks are more susceptible to nodes leaving the network and noise, and thus data corruption than wired networks.
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EXISTING SOLUTIONS A number of tree-based solutions have been proposed, most notably: o IP Multicasting. o Application Layer Multicast (ALM).
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IP MULTICASTING In IP Multicasting, the multicast tree comprises the server at the root, the clients at the leaf nodes and all the intermediate routers at the remaining internal nodes. Disadvantage : cost – the routers at the internal nodes of the multicast tree need to have special capability and thus incur greater setup and deployment-costs than ordinary routers.
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APPLICATION-LAYER MULTICASTING (ALM) In Application-Layer Multicasting, the server creates an overlay network comprising all the interested clients. The clients are organised into one or more multicast trees. Each client is responsible for duplicating data and forwarding it to all the descendant clients.
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ALM – PROS AND CONS Advantage: The approach can be readily deployed using existing infrastructure.
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