A global control system for integrated admission control and routing in ATM networks

In this paper a global control system for admission control, routing and bandwidth allocation in the ATM environment is presented. The traffic is divided into classes, characterized by statistical parameters and by quality of service (QoS) requirements, as the rates of lost and delayed cells. At connection set-up, a strategy decides if a connection request has to be accepted or rejected and which is the best route that all the cells of that connection have to follow. The decision about acceptance guarantees the QoS requirements for each class, while the routing strategy is aimed at minimizing the number of blocked calls in the network. The whole system provides also a mechanism to achieve a fair and adaptive bandwidth allocation for each traffic class; the bandwidth allocation control has a longer intervention period than the admission and routing control. In fact, the global strategy can be regarded as a hierarchical one. Several simulation results are reported, to verify the effectiveness both of the admission and routing mechanism and of the allocation strategy.