Quality-of-Experience for Multimedia

Conclusion

Network services have grown increasingly over the past several years with a variety of high-quality applications such as IPTV, VoIP, videoconferencing, telepresence and online games. Facing such rapid development, the widely used Quality of Service (QoS) framework, which is defined as an aspect ensuring service quality of network traffic, is not suitable enough. In fact, the traditional QoS networking is based on the technical parameters (e.g. delay, jitter, bandwidth and loss rate), which are too trivial to be competitive factors between service providers in today’s Internet. Actually, a traffic flow delivered with excellent QoS metrics may risk delay experience of a videoconference client or an echo of the voice of a VoIP user. In addition, satisfying such a set of constraints risks meeting problems of complexity due to the fact that a QoS model with more than two non-correlate criteria meets an NP-complete problem. All service operators and providers gradually know that the most important goal is to satisfy end users who directly “pay” for these services. Ignoring user perception risks client dissatisfaction, churn and lost revenue. Therefore, satisfying end users today becomes a new trend for network management systems. Service providers need a new criterion that refers to the user experience in order to improve the traditional QoS parameters. In this book, we showed the inefficiency of QoS-based algorithms for user satisfaction optimization. As the latter is, by ...