Construction of sabotage-resistant and efficient overlay topologies for IPTV distribution infrastructures
Continuation of the project "Design of sabotageresistant and efficient overlay topologies for live streaming applications" (DoSResistantStreaming) (February 2008 to January 2010) Funding since February 2010 over 24 months by DFG
Department of Telematics/Computer Networks (TM/RN), TU Ilmenau Department of Automata and Formal Languages (AFS), TU Ilmenau
FG TM/RN Dipl.-Inf. Mathias Fischer (technical) Prof. Dr.-Ing. Günter Schäfer (administrative)
FG AFS Dipl.-Inf. Sascha Grau (technical) Prof. Dr. Manfred Kunde (administrative)
In the previous project "Construction of sabotageresistant and efficient overlay topologies for live streaming applications", attack- and sabotageresistant topologies for push-based Application Layer Multicast (ALM) streaming systems were investigated and basic steps for their decentralized construction by the streaming participants were taken. The increased practical use of peer-to-peer streaming systems, in combination with new developments in the research environment, gives rise to new issues and optimization problems that have not been considered so far. For example, streaming systems on the market are not limited to the delivery of a single stream, but typically broadcast a wide range of programs that may be fed from different sources. In addition, there is an increasing heterogeneity in both the demands and the resources of the participants. A practical streaming system should therefore be able to simultaneously supply households connected via fiber optic line with HDTV content as well as mobile clients with content in reduced quality and to make optimal use of the available resources in each case. In addition, temporal fluctuations in viewer behavior must be taken into account. Furthermore, the logical embedding of the overlay network, including efficiency and robustness criteria, into the underlying infrastructure network should be considered. Finally, current research on the future of the Internet based on increasing network virtualization offers the possibility of moving application-specific routing logic to intelligent routers in the form of migratable virtualized machines. Using these means to establish relocatable ALM routers in the service provider's core network promises in turn a significant increase in delivery efficiency, as well as stability, for a peer-to-peer streaming system. Thus, in a first step, the goals of this project are to transfer the previous findings on sabotage-resistant ALM streaming to the now significantly extended scenario. Based on this, a number of central further questions are to be identified and solved. In particular, the consideration of strong heterogeneity in demands and equipment of the peers as well as the embedding in the infrastructure network results in new challenges and questions regarding topology stability and topology efficiency, which are to be clarified. The solutions developed in this context will be evaluated in detail in simulation studies.