Threshold-based congestion control in ATM networks

In this paper, we present the simulation of a call oriented congestion avoidance technique in ATM networks for B-ISDN. This technique belongs to the category of preventive congestion avoidance techniques. To keep things simple and minimize the overhead, we do not maintain a separate threshold for different types of services. We assume that an incoming call is accepted if its resource requirement is not more than X percentage of the remaining resources at any of the points along the route of this call. The resource requirements include the bandwidth and buffer requirements. Therefore, if a call is to use more than X percentage of the available resources, the call will be blocked. Otherwise the call will be accepted. This scheme is very simple and is effective at the same time.