Showing papers by "Frank Hartung published in 2005"

Media aware overlay routing in Ambient Networks

Abstract: With the increasing heterogeneity of Internet enabled devices and Internet access technologies, media content may often need to be adapted to best meet the user or application needs. However, server-side adaptation has shown its limitations, leading to the development of network-side adaptation techniques. Overlay networks have emerged as a possible solution to enable data processing between users and the content server, as it allows to transparently include media processing nodes into the end-to-end media path. Nevertheless, to deal with multimedia streams in an efficient way, current proposals lack application awareness when k comes to routing decisions. Typically overlay networks only consider IP header information when routing packets. In this paper we introduce a new concept that shall enable media aware routing via the use of overlay networks. The proposed routing approach considers service and application information to improve routing decisions based on the user/application requirements. In our proposal, service-specific overlay networks (SSONs) are created for every service, which allows customisation of the network resources. SSONs include overlay nodes with adaptation capability. The data routing in the SSON is performed using the media aware overlay routing logic. This paper presents the concept, along with a proposed architecture designed to provide a media aware routing service. The advantage of the proposed functionality is illustrated based on a mobile user scenario

Media Aware OverlayRouting in Ambient Networks

Abstract: Withtheincreasing heterogeneity ofInternet enabled devices andInternet access technologies, mediacontent mayoften needtobeadapted tobest meettheuserorapplication needs.However, server-side adaptation hasshownits limitations, leading to thedevelopment of netvork-side adaptation techniques. Overlay Networks haveemerged asa possible solution toenable dataprocessing between usersand thecontent server, asitallows totransparently include media processing nodes into theend-to-end mediapath. Nevertheless, todealwithmultimedia streams inanefficient way,current proposals lackapplication awareness whenitcomestorouting decisions. Typically overlay networks onlyconsider IPheader information whenrouting packets. Inthis paper weintroduce a newconcept that shall enable mediaawarerouting viatheuseof overlay networks. Theproposed routing approach considers service andapplication information toimprove routing decisions basedontheuser/application requirements. Inourproposal, service-specific overlay networks (SSONs) arecreated forevery service, whichallows customisation ofthenetwork resources. SSONsinclude overlay nodeswithadaptation capability. The datarouting intheSSONisperformed using themediaaware overlay routing logic. Thispaperpresents theconcept, along withaproposed architecture designed toprovide amedia aware routing service. Theadvantage oftheproposed functionality is illustrated based onamobile userscenario. IndexTerms-Overlay networks, ContentAdaptation. NetworkProcessing, Adaptive NetworkTechnologies, Media Awareness, MediaRouting.