An efficient scheme for congestion control in broadband ISDNs

The technique presented belongs to the category of preventive congestion avoidance techniques. To minimize the overhead, a separate threshold for different types of services is not maintained. 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 is blocked. Otherwise, the call is accepted. This scheme is very simple and effective. Simulation results are presented in terms of call blocking probabilities for several different cases