Congestion control is required in ATM (Asynchronous Transfer Mode) networks to fairly allocate network resources to the various service types and mixes carried out by the high speed wide area networks. Admission control is one of the congestion control mechanisms to be executed at the virtual call set-up. Access nodes decide to accept or reject a connection request based on a description of the traflc anticipated by the bursty source and of the traflc load encountered by the connection along the network route. To each new connection an appropriate bandwidth is assigned in order to ensure that the cell transport performance (cell losses and delay) remains at a satisfactory level for all users.This paper reports some simulation results for mixes of bursty traffic on a network employing a proposed mechanism for bandwidth assignment called "Class Related Rule". The allocation of virtual calls into a trunk group of ATM links using this bandwidth assignment mechanism is further investigated via simulation in order to ensure given virtual call blocking objectives (call losses).
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