Quality of experience vs. quality of service : Application for a CDN Architecture

We are witnessing in recent years a rapid development of interconnecting applications. In addition to those that contributed to the popularity of the early Internet (email, file transfer, etc.), there are now applications that rely on network data more sensitive. They include sound applications (voice, music programs, etc.), image applications (television programs, videoconferencing, video on demand, etc.) and urgent information applications (market orders). However, it is important for the operators and providers not to forget sight of the reason for this new infrastructure: to provide network service that user wants to use. Accomplishing this idea means assuring positive experience of end users. Therefore, service providers are switching the focus from traditional Quality-of-Service (QoS) to user satisfaction, which is the overall success of a network from the user perspective. The perceived end-to-end quality becomes one of the main goals required by users that must be guaranteed by the network operators and the Internet service providers, through manufacturer equipment. This is referred to as the quality of experience (QoE) notion that becomes commonly used to represent user perception. This paper will focus on a vision of a new paradigm which make interactions first-class objects from the perspective of the user, the application and the network components. This is achieved by analyzing the interaction between the user and the application with quality perception metrics which are used to fix the control/command chain in network components. The idea here is how to integrate these metrics into a control/command chain in order to construct a network system? In this paper, we focus on one main mechanism for a Content Delivery Network Architecture: the server selection function.