DiffServ-Aware Flow Admission Control and Resource Allocation Modeling

International audienceThe emergence of multimedia applications like IPTV or games, underlines the need for QoS in networks. Among several approaches, the DiffServ architecture appears to be a promising solution, widely implemented, and included from the early phases in the specification of new architectures like IMS (IP Multimedia Subsystem). The complexity of DiffServ lies in the dimensioning and the parameterization. We propose a model to study network dimensioning and route provisioning for classes of service as multicommodity flow problems, addressing the offline optimization of bandwidth allocation for every class of traffic. This leads to the allocation of all demands for EF, a maximum concurrent flow problem for AF and BE and a maximum multicommodity flow problem for out-of-profile AF traffic. The result is an optimal routing for EF, AF and BE demands. The AFOUT allocation rate indicates the possible extension of the SLAs and highlights the links to consider in priority for network evolutions