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7th International Symposium on distributed simulation and Real-Time Applications

作者： Moen, DM Pullen, JM George Mason Univ Fairfax VA 22030 USA

ISBN: (纸本)0769520367

Many-to-many multicast transmission is an essential network capability for scalable distributed simulation. The many open issues that make network-layer multicast impractical over the Internet today are likely to continue to be insurmountable and to prevent deployment in a manner that will meet the Quality of Service (QoS) and many-to-many multicast needs of real-time distributed virtual simulation (RT-DVS). We propose an alternative approach, whereby the IP multicast function is relocated to the simulation host computer and also used to provide for QoS enabled services on a priority basis. This paper explores the concept of such a host-based multicast system with QoS and its suitability for RT-DVS. The paper defines the basic requirements of a host-based multicast protocol to support RT-DVS and proposes a quantitative model for evaluation of system alternatives.

关键词： distributed virtual simulation multicast networking overlay multicast

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Multiuser 3D virtual simulation environments support in the Gnutella peer-to-peer network

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JOURNAL OF PARALLEL AND distributed COMPUTING 2005年第11期65卷 1462-1469页

作者： Boukerche, A Araujo, RB Laffranchi, M Univ Ottawa SITE Ottawa ON K1N 6N5 Canada Univ Fed Sao Carlos DC BR-13560 Sao Carlos SP Brazil

One of the challenges for 3D multiuser virtual simulation environments (3DMUVEs) developers is to keep the shared virtual simulation environment synchronized among all the participating users' terminals. Support to 3DMUVEs through traditional client-server communication model offers simpler management but can lead to bottlenecks and higher latencies. Peer-to-peer communication model, on the other hand, offers no central coordination but are more complex to manage. Current peer-to-peer networks, such as KaZaA and Gnutella, provide multimedia sharing services but do not support multiuser 3D virtual environment (VE) applications. This paper describes a solution to support 3DMUVEs in a hybrid peer-to-peer Gnutella network, which provides session control and distributed shared VE synchronization. As a result of this work, two components specified by the ongoing multiuser extension to the MPEG-4 standard were implemented and integrated to the Gnutella network for control and synchronization. This solution minimizes the disadvantages of client-server and pure peer-to-peer models. The results show that this approach can be a feasible solution, specially for spontaneous 3DMUVEs that can emerge from any user, with no investment needed (apart from his own computer). The use of peer-to-peer networks such as the Gnutella could be used as a test environment for companies wishing to check both their multiuser 3DMUVEs software for correctness and their acceptance by the users community before making heavy investments. (c) 2005 Published by Elsevier Inc.

关键词： collaborative virtual environment distributed virtual simulation peer-to-peer networks synchronization Gnutella network

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