On virtualization-based network support for peer-assisted live-streaming applications

IPTV will be one of the main drivers of network innovation in the near future. Its bandwidth demands, especially if combined with HDTV, require smart algorithms for content distribution. One approach that is currently discussed intensively is Application Layer Multicast (ALM), which allows to scale to large node numbers by incorporating the resources of participating peers. In addition, locality-aware ALM approaches can distribute content close to the edges of the network and thus are able to relieve core networks from traffic. In this work, we propose to combine ALM with virtual routers that assist in content distribution, so-called ALM-Routers. They can be moved between distinct network positions and are inspired by current research towards a future Internet. Furthermore, we propose adaptation algorithms that operate solely on local knowledge and optimize ALM-Router positions as well as their overlay neighborhood. As our simulation results indicate, already a small fraction of such virtual nodes deployed on core network routers, decrease the overall traffic amount. Moreover, a subsequent optimization of the positions of ALM-Routers and the optimization of their overlay neighborhood induces additional considerable traffic savings compared to a static placement.