ISABEL - Experiment Distributed Cooperative Work Application over Broadband Networks
IWACA '94 Proceedings of the Second International Workshop on Multimedia: Advanced Teleservices and High-Speed Communication Architectures
High-definition multimedia for multiparty low-latency interactive communication
Future Generation Computer Systems - IGrid 2005: The global lambda integrated facility
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ICN'05 Proceedings of the 4th international conference on Networking - Volume Part II
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In this paper, we present a framework called CoUniverse, designed for building real-time user-empowered collaborative environments to work primarily on high-speed networks with true high-bandwidth applications such as uncompressed high-definition video. The system is designed for unreliable experimental infrastructures and therefore its operation relies heavily on self-organizing principles--this is also useful approach for extending it to larger infrastructures. When media stream bitrate is comparable to a capacity of the links, the additive assumption no longer holds and the system needs to have a sophisticated scheduling. The scheduler is conceived as a flexible plug-in for the CoUniverse framework. In this paper, we present a formal scheduling model based on constraint programming including evaluation of its prototype implementation. CoUniverse is designed to utilize external media applications, so that a wide variety of existing tools can be used. The whole system has been prototyped and demonstrated, e. g., during international demonstration on the GLIF 2007 workshop.