Functioning and management of MPLS/QOS in the IMS architecture

The appearance of new uses underlines the need for a greater quality of service (QoS) not only for conveying accurately or increasing a certain traffic, but also conveying it as soon as possible while holding management account of the resources networks (band-width), which implies a network management even more complex. These are the needs which gave birth to MPLS technology. Admittedly, the growth of the flows of access and the convergence of the services known as “triple play” (Internet, voice/videoconference, television video on demand) on an infrastructure IP federator involve a considerable increase of volumes of IP traffic as well as new constraints in terms of QoS and reliability for IP networks. Mechanisms of engineering of traffic, QoS and security become necessary to support this evolution (in terms of volume and nature) of the transported traffics. Various methods of engineering of traffic for IP networks have been specified for several years. Among these methods, we find one based on the use of MPLS technology. This technology adapted particularly well to the engineering of traffic because it allows the creation of ways that are explicit and independent of IP road. In this article we tried to deduce principal operation from MPLS protocol in IMS architecture. We propose to associate the mechanisms of management of QoS in the architecture of the Next Generation Networks (NGN) with plan of IP Multi-media Subsystem session (IMS). We will strongly highlight the importance of the MPLS used for the transport of the IP datagram and the traffic. We underline the advantages of MPLS utility in the IMS platforms to provide guarantees of QoS from beginning to end. We conclude our article by a simulation from an MPLS network.