INVESTIGATION OF OVERLOAD CONTROL ALGORITHMS FOR SCPS IN THE INTELLIGENT NETWORK

All nodes in the intelligent network (IN) must have an overload contro l mechanism which protects the node by rejecting calls when the load o n the node is too high. Two examples of IN nodes are the service contr ol point (SCP), which contains the service logic that is used to provi de IN services, and the service switching point (SSP) which detects re quests for IN services. The authors investigate overload control mecha nisms for the SCPs. To achieve an efficient control, the rejecting mec hanisms are placed in the SSPs instead of the SCPs. It is stressed tha t the algorithms should be both efficient and show fairness among a nu mber of SSPs logically connected to the SCP. The results show that, to have fairness among the SSPs, the SCPs must control the acceptance ra te.