Collusions entre fournisseurs de services et de contenus dans les réseaux

International audienceCet article traite d'un modèle de jeu de routage destiné à étudier les relations entre utilisateurs, fournisseurs de services et fournisseurs de contenus dans l'Internet. Nous nous intéressons notamment aux relations économiques entre les fournisseurs. Notre principal résultat porte sur l'impact, sur les utilisateurs finaux, d'une collusion (relation contractuelle privilégiée) entre certains fournisseurs de services et certains fournisseurs de contenus. Particulièrement, nous montrons qu'un système complètement ouvert (sans collusions) est moins intéressant pour les utilisateurs finaux qu'un système avec des collusions entre fournisseurs

Competition in Access to Content

Part 5: Cooperation and CollaborationInternational audienceWe study competition between users over access to content in a telecom market that includes several access providers and several content providers. We focus situations where exclusive agreements exist between content and access providers, which allows access providers to offer content services for free for their subscribers. We call access providers having such agreements ”super” providers or ”enhanced” service providers. We show that the competition between the users results in a paradoxical phenomenon in which subscribers of enhanced providers prefer to defer part of their demand to other content providers whose content is costly. We show how this phenomena can be exploited by the content providers so as to maximize their benefits

Symmetric Games with networking applications

In their seminal paper [1], Orda, Rom and Shimkin have already studied fully symmetric routing games, i.e. games in which all players have the same sources, destinations, demands and costs. They established the uniqueness of an equilibrium in these games. We extend their result to weaker forms of symmetry, which does not require a common source or destination. Considering routing games, we provide conditions under which whenever there is some symmetry between some players, then any equilibrium necessarily has these symmetry property as well. We then extend the symmetry result to general games