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We develop a method of dimensioning and managing the bandwidth of a link on which TCP flows from access links are aggregated. To do this, we extend the application of the processor-sharing queue model to TCP performance evaluation by using flow statistics. To handle various factors that affect actual TCP behavior, besides the access-link bandwidth, such as round-trip time, window-size, and other bottlenecks, we extend the model by replacing the access-link bandwidth with the actual file-transfer speed of a flow under a low utilization of the aggregation link. We only use the number of active flows and the link utilization to estimate the file-transfer speed. Unlike previous studies, the extended model based on the actual transfer speed does not require any assumptions/predeterminations about file-size, packet-size, and round-trip times, etc. Using the extended model, we predict the TCP performance when the link utilization increases. We also show a method of dimensioning the bandwidth needed to maintain TCP performance. We show the effectiveness of our method through simulation analysis.
Global Telecommunications Conference, 2004. GLOBECOM '04. IEEE (Volume:2 )
Date of Conference: 29 Nov.-3 Dec. 2004