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The authors compute the throughput obtained by a TCP connection in a UMTS environment. For downloading data at a mobile terminal, the packets of each TCP connection are stored in separate queues at the base station (node B). Also due to fragmentation of the TCP packets into Protocol Data Units (PDU) and link layer retransmissions of PDUs there can be significant delays at the queue of the node B. In such a scenario the existing models of TCP may not be sufficient. Thus, they provide a new approximate TCP model and also obtain new closed-form expressions of mean window size. Using these they obtain the throughput of a TCP connection which matches with simulations quite well.
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