This paper presents the results of analytical and simulation study of flow and congestion control in packet-switched networks. The novel result of this study presents a unified flow and congestion control technique for virtual circuit-type packet transport networks with prioritized service on trunks. The technique is based on queue length observations,propagation of congestion information, and source rate reduction using the existing flow control. Comparative evaluation between this method and those currently in operation are made and its advantages are highlighted. Suggestions for further research are described. The performance of this control scheme was evaluated by simulating a queueing model of a packet-swltched network with flow and congestion control. The model represents a typical subnet of N-cascaded nodes carrying prioritozed traffic.It is shown that this suggested scheme is an effective control mechanism for the adaptive nature of congestion phenomena. Finally, its applicability in practical networks is discussed.
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