A simulation study of advanced routing methods in a multipriority telephone network

Traffic and load control in multipriority telephone networks using advanced routing methods are analyzed using a special-purpose simulation program. Nonadaptive schemes as well as local and centralized adaptive schemes are studied, and a new centralized adaptive method is proposed. The grade of service, probability of preemption, and average number of trunks used per call serve as performance criteria and are compared for different load conditions and routing methods. It is shown that the centralized adaptive methods are superior to all others, with the newly proposed centralized adaptive method allowing for greater flexibility in network management without degradation in performance.