These latest years, the evolutions of computer science and telecommunications led to a radical modification of the communication landscape, and consequently of the Internet and its services: applications are now multimedia, multi users and co-operatives; networks now provide high transmission rates, at local scale or long distance, and make it possible to be connected to the Internet via various types of terminals and wire/wireless access points. In spite of these advances, the Internet communication services are still insufficient, in this way that they provide no guarantee on the performances, particularly as far as the end-to-end transit delay is concerned. This problem is targeted by our work, which addresses the need of new services, p...