Showing papers by "Bernard Cousin published in 2004"
28 Jun 2004
TL;DR: A generalized version of the Xcast protocol, called GXcast, intended to permit the X cast packets fragmentation and to support the increasing number of members in a multicast group is proposed.
Abstract: Recently several multicast mechanisms were proposed that scale better with the number of multicast groups than traditional multicast. These proposals are known as small group multicast (SCM) or explicit multicast (Xcast). Explicit multicast protocols, such as the Xcast protocol, encode the list of group members in the Xcast header of every packet. If the number of members in a group increases, routers may need to fragment an Xcast packet. Fragmented packets may not be identified as Xcast packets by routers. In this paper, we show that the Xcast protocol does not support the IP fragmentation. We show also that avoiding fragmentation limits the group size that can be handled by the Xcast protocol. First, we describe the Xcast protocol, the Xcast+ protocol (which is an extension of Xcast) and we compare these two protocols with traditional multicast protocols. We propose then a generalized version of the Xcast protocol, called GXcast, intended to permit the Xcast packets fragmentation and to support the increasing number of members in a multicast group. The behavior of the GXcast protocol is analyzed according to several criteria. Finally, we present and evaluate with simulations an improvement to GXcast and we conclude that GXcast is a feasible and promising protocol.
23 citations
TL;DR: The Architectural Solutions for Services Enhancing digital Television (ASSET) project as discussed by the authors aims to overcome the limitations of custom specific implementations in a digital system for TV content creation, such as the misfit of interfaces between software layers, proprietary application program interfaces (APIs) of equipment from different vendors, and the lack of a generalized middleware for multimedia content management with openly defined interfaces.
Abstract: Applications and products currently available for the broadcasting market are vertically integrated or proprietary. They are based on components requiring specific and costly development to interoperate and typically rely on a single manufacturer or system integrator. Hence, they are not fully compliant with broadcasters' requirements. Architectural Solutions for Services Enhancing digital Television (ASSET) is a European-funded project. Its main goal is to overcome the limitations of custom specific implementations in a digital system for TV content creation. These limitations are generally due to the misfit of interfaces between software layers, proprietary application program interfaces (APIs) of equipment from different vendors, and the lack of a generalized middleware for multimedia content management with openly defined interfaces. Besides presenting the ASSET-proposed architecture and concepts, this paper describes the prototype under development to test and demonstrate the project proposals.
2 citations
29 Nov 2004
TL;DR: In LaidaNet, the distribution of labels is assuree par un controleur, who is en charge of configuring the reseau. And the presence of a controllable label distribution permet de reduire le recours a la diffusion, and simplifying les fonctions des commutateurs.
Abstract: L'evolution des reseaux est marquee aujourd'hui par deux grandes tendances : l'utilisation d'Ethernet pour le transport des donnees sur la couche 2 et l'utilisation de la commutation de labels pour la gestion du trafic (MPLS s'est impose comme le standard). Avec LaidaNet, nous avons voulu combiner ces deux techniques afin d'ameliorer les services fournis dans les reseaux locaux, notamment les VLAN. Les commutateurs dans un reseau LaidaNet redirigent les trames grâce aux labels qu'elles contiennent, tandis que les stations ont un comportement standard. La distribution des labels est assuree par un controleur, qui a en charge la configuration du reseau. La commutation de labels permet d'offrir dans LaidaNet des fonctionnalites avancees de gestion de trafic, telles que l'agregation de flux et le routage explicite. La presence du controleur permet de reduire le recours a la diffusion, et de simplifier les fonctions des commutateurs. L'implementation des VLAN dans LaidaNet est particulierement interessante, car elle permet une grande flexibilite dans la definition des VLAN, sans toutefois modifier le fonctionnement des commutateurs. Par consequent, leurs performances ne sont pas degradees par la presence des VLAN.