Quality of service of internet service provider networks: State of the art and new trends

These ten last years, the emergences of new applications through Internet such as multimedia applications (VoIP, video broadcasting ...) or networked control application, users need more and more quality of service (QoS) when using Internet. However, the requested QoS is not the same depending on the application. Some of them request a lot of bandwidth like video broadcasting others need short guaranteed delays. Several new models to manage internet traffic have been proposed. Most of them focus on specific QoS criteria that they want to optimize. This paper focus on approaches based on MPLS that are more adapted to the configuration of ISP networks. The paper first introduces the different mechanisms that can be used to improve the QoS of a network such as the models of traffic classification (IntServ or DiffServ) or multipath routing. It also justifies the choice of MPLS technology versus a simple use of IP. After that, the paper presents main MPLS approaches such as MATE, LDM or LBWDP that try to guaranty a certain quality with respect to specific criteria. In the last part, it presents new models such as PEMS that try to adapt the offered quality depending on the class of the routed traffic.