Adaptive Admission Control for Quality of Service Guarantee in Differentiated Services Networks

For avoiding congestion, the amount of injected traffic into the network should be controlled. Differentiated services network can support the quality of service (QoS). For QoS guarantee, Admission control mechanism should be added to the edge routers of the network. The process of deciding to accept or reject a new request is called admission control. In this paper, parameter based admission control (PBAC) is compared with measurement based admission control (MBAC), as well to situation when no admission control is used. These methods are implemented in ingress nodes of differentiated services network. In proposed MBAC scheme, an adaptive method is used for estimating the required bandwidth. We use NS-2 simulator to demonstrate that the proposed admission control achieves the desired performance and possesses important attributes, e.g. high utilization with bounded loss together with low blocking.