Dynamic Mapping between the Controlled-Load IntServ Service and the Assured Forward DiffServ PHB

This work addresses the interconnection of the IntServ and DiffServ models. In particular, new mapping mechanisms between the Controlled-Load service (CL) of the IntServ model and the Assured Forward (AF) Per-HopBehaviours group of the DiffServ model, are proposed and analysed by simulation. The proposed mechanisms have a dynamic nature and they are associated to an admission control such that the state of the network is reflected in the new admission decisions of the new IntServ flows into the DiffServ network. For the same IntServ destination network, the behaviour of the previous flows is taken into account. The results show that the functionality of IntServ networks can be extended through DiffServ regions without perceptible degradation of QoS. Moreover the dynamic mapping mechanisms take into account the state of the network, improve the use of the available resources for each AF class and guarantee the AF class QoS even when congestion rises.