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An SSM-based communication architecture for large-scale virtual environments

Laurentiu Barza 1, 2
2 PLANETE - Protocols and applications for the Internet
Inria Grenoble - Rhône-Alpes, CRISAM - Inria Sophia Antipolis - Méditerranée
Abstract : The subject of this thesis is situated at the confluence of the virtual environments (VE) and the IP networking. It is about the possible existence over the Internet, in the near future, of heterogeneous, large-scale, distributed virtual environments, inhabited by millions of entities.
The thesis presents the development, the implementation and the experimentation of a communication architecture for a large-scale VE application. The goal of this architecture is to allow a large number of participants, located in a VE, to communicate between them, using various data flows (video, audio, text). In the design of this architecture we have considered the following objectives : to minimize the traffic in the network, to allow a large number of participants to be simultaneously connected in the VE, to accept participants with very different capabilities, to give to each participant the possibility to communicate according to its capacities and to take into account the real-time constraints specific to the Multimedia flows. We have chosen to use the multicast, as the group communication model, in particular for the aspects of congestion control, in order to reduce the traffic in the network .A simplified model of multicast have been proposed by the IETF, the SSM model (or Specific Source multicast). We have chosen to use it in our architecture, because it is better suited to express the various preferences of the participants. Our architecture is composed by two filtering levels. On the first level of filtering, the VE is dynamically partitioned into zones, according to the density of participants in the world. On the second level of filtering, the participant determines its neighbours in the VE and begins to communicates with them, according to their capacities. A participant may transmit different types of data flows. Each flow is sent over a different SSM channel. The experiments have proved the feasibility and the performances of our architecture compared with other architectures suggested in the literature. We have integrated our communication module in V-Eye, a VE application developed in the Planete Research Team.
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Contributor : Estelle Nivault <>
Submitted on : Thursday, August 21, 2008 - 3:16:21 PM
Last modification on : Thursday, March 5, 2020 - 6:50:28 PM
Long-term archiving on: : Thursday, June 3, 2010 - 5:29:18 PM


  • HAL Id : tel-00311830, version 1



Laurentiu Barza. An SSM-based communication architecture for large-scale virtual environments. Networking and Internet Architecture [cs.NI]. Université Nice Sophia Antipolis, 2004. English. ⟨tel-00311830⟩



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