Trunk congestion control in heterogeneous circuit switched networks

Several types of routing and controls for heterogeneous circuit switched networks with two classes of traffic of unequal arrival times and holding times were introduced. A performance evaluation was made, based on a fully connected symmetrical network model. It was shown that the trunk reservation technique can be applied to alleviate trunk congestion caused by excessive alternate routing at heavy loads. It was further shown that restricted access and preemptive priority control can be used to enforce routing priority ordering over the two classes of traffic, keeping the call-blocking probability of one class of traffic at a certain level while minimizing that of the other class. It is concluded that these findings are significant in applications of integrated communications services where various classes of services have different traffic characteristics and service requirements.<>