A 2-LAYER QUEUING MODEL TO PREDICT PERFORMANCE OF PACKET TRANSFER IN BROAD-BAND NETWORKS

In this paper, we propose an approximate analytical method to predict the performance of packet transfer in broadband networks. Since the AT M is a promising way to achieve a multimedia data transmission in broa dband networks, the underlying network is assumed to be an ATM network . To represent the packet-level and the cell-level data transfers, we introduce a two-layer queueing network model. In the higher layer of t he model, the source node (the sender) generates packets and then segm ents the packets into cells, while the destination node (the receiver) reassembles the arriving cells into the packets. The lower layer mode l is a tandem queueing network in which each queue corresponds to an A TM switch. We employ a discrete-time analysis of the queueing network model to obtain the packet-level performance measures, such as the end -to-end packet transfer delay, the packet loss probability, and the th roughput. In numerical examples, we show some packet transfer delay di stributions and effects of the packet size on the packet loss probabil ity.