Département Réseau, Sécurité et Multimédia Rapport d'Activités 2008
Département Réseau, Sécurité et Multimédia Rapport d'Activités 2008
Département Réseau, Sécurité et Multimédia Rapport d'Activités 2008
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One of the most difficult aspects ofguaranteeing QoS from end-to-end during amultimedia session is to obtain an interdomainpath with the appropriate QoSguarantees. This implies a negotiation b<strong>et</strong>weenthe chain of domains and the allocation of theresources for the flow. The traditional interdomainrouting protocol BGP (Border GatewayProtocol) is a solution to find an inter-domainpath but it is not able to provide any QoSindication, nor guarantee. The IETF is currentlyworking on the definition of a new element inthe n<strong>et</strong>work to solve the problem of finding aninter-domain path with constrains. Thiselement, called PCE (Path ComputationElement) can be seen as an overlay, eachdomain having one or several PCE,communicating tog<strong>et</strong>her in order to compute apath with required properties. These propertiescan be related to QoS, to n<strong>et</strong>workoptimization, to traffic engineering issues, …[2] BERTRAND Gilles, TEXIER Géraldine. AdhocRecursive PCE Based Inter-domain PathComputation (ARPC) M<strong>et</strong>hods. FifthInternational Working Conference onPerformance Modeling and Evaluation ofH<strong>et</strong>erogeneous N<strong>et</strong>works (HET-NETs), 18-20of February, Karlskrona, Sweden, <strong>2008</strong>[3] BERTRAND Gilles, TEXIER Géraldine.Intégration du routage PCE aux réseaux deprochaine génération avec IMS. . 9èmesJournées Doctorales en Informatique <strong>et</strong>Réseaux (JDIR'08), 17-18 January <strong>2008</strong>,Villeneuve d'Ascq, France, <strong>2008</strong>[4] BERTRAND Gilles, The IP MultimediaSubsystem in Next Generation N<strong>et</strong>works.http://www.rennes.enstbr<strong>et</strong>agne.fr/~gbertran/files/IMS_an_overview.pdfConclusionThis project has given the opportunity to studyand immerge ourselves in the IMS and NGNarchitecture. These subjects are especiallyactive and mobilize the main operators andactors of the n<strong>et</strong>work community as well asthe content delivery community. TELECOMBr<strong>et</strong>agne focused on the interaction of the IMScore with the transport layer, especially in aninter-domain context, to guarantee QoS forsome very important flows. The consortiumhas been very active and the dynamicgenerated has led to the submission of theNextTV4all project by DGE. NextTV4all is aproject that aims at constructing high-valueservice offers The objective is to develop anaudio-video content delivery system based onIMS and the fix-mobile convergence forn<strong>et</strong>work and services and following theanywhere/anytime concept. The activity oninter-domain n<strong>et</strong>working with QoS, developedat TELECOM Br<strong>et</strong>agne, will be continued in theNextTV4All project within the multi-X axis(multi-AS, multi-devices, multi-users, multiproviders).References[1] BERTRAND Gilles, TEXIER Géraldine.DiffServ-Aware Flow Admission Control andResource Allocation Modeling. Workshop on IPQoS and Traffic Control, 6-7 December 2007,Lisbon, Portugal, IST Press, 200716 Extract of Pracom’s Annual Report <strong>2008</strong>
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