Adaptive packet forwarding for relative differentiated services and categorized packet video

We explore a methodology to divide an application´s data into several categories and send them through different IP differentiated services vices (DiffServ) grades. The issues are motivated by a futuristic infrastructure wherein the Internet service provider charges different prices to packets going through different service grades. This paper discusses how a subscriber of the DiffServ can assign different grades to real-time video packets on the basis of the packets´ relative importance under the constraint of communication expenses. For relative DiffServ, we present an adaptive packet forwarding mechanism to preserve the performance ratio among service grades persistently over different time scales. Through experiments we observe how this packet forwarding mechanism improves the the quality of the application that maps the packets into the different service grades. In the experiment the end-to-end performance is evaluated by the error resilient packet video transmission using ITU-T H.263+ codec over a simulated Diffserv network