Journal ArticleDOI
Dimensioning bandwidth for elastic traffic in high-speed data networks
Arthur W. Berger,Yaakov Kogan +1 more
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The model is compared with simulations, the accuracy of the asymptotic approximations are examined, the increase in bandwidth needed to satisfy the tail-probability performance objective as compared with the mean objective, and regimes where statistical gain can and cannot be realized are shown.Abstract:
Simple and robust engineering rules for dimensioning bandwidth for elastic data traffic are derived for a single bottleneck link via normal approximations for a closed-queueing network (CQN) model in heavy traffic. Elastic data applications adapt to available bandwidth via a feedback control such as the transmission control protocol (TCP) or the available bit rate transfer capability in asynchronous transfer mode. The dimensioning rules satisfy a performance objective based on the mean or tail probability of the per-flow bandwidth. For the mean objective, we obtain a simple expression for the effective bandwidth of an elastic source. We provide a new derivation of the normal approximation in CQNs using more accurate asymptotic expansions and give an explicit estimate of the error in the normal approximation. A CQN model was chosen to obtain the desirable property that the results depend on the distribution of the file sizes only via the mean, and not the heavy-tail characteristics. We view the exogenous "load" in terms of the file sizes and consider the resulting flow of packets as dependent on the presence of other flows and the closed-loop controls. We compare the model with simulations, examine the accuracy of the asymptotic approximations, quantify the increase in bandwidth needed to satisfy the tail-probability performance objective as compared with the mean objective, and show regimes where statistical gain can and cannot be realized.read more
Citations
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Journal ArticleDOI
Detection of TCP Performance Degradation Using Link Utilization Statistics
TL;DR: With this method, a network operator can determine whether or not the degradation originates from the congestion of his/her own network, and the cost of performance management can be greatly decreased compared with the conventional method, which requires dedicated equipment to measure the network performance.
Proceedings ArticleDOI
Two-Phase Modeling of QoS Routing in Communication Networks
Chia-Hung Wang,Hsing Luh +1 more
TL;DR: A precomputation-based scheme which offers Pareto optimal solutions to the network dimensioning problem and a bandwidth allocation model with nonlinear utility functions is proposed.
Journal ArticleDOI
A Method of Bandwidth Dimensioning and Management Using Flow Statistics
TL;DR: A method of dimensioning and manag- ing the bandwidth of a link on which TCP flows from access links are aggregated by replacing the access-link bandwidth with the actual file-transfer speed of a flow under a low utilization of the aggregation link is developed.
Proceedings ArticleDOI
Fundamental Studies on Ultra-High-Speed Optical LAN Using Optical Circuit Switching
Shigeo Shioda,Shu Namiki +1 more
TL;DR: Simulation results show that the hybrid configuration of OCS and EPS is very preferable especially when the variance of file size is very large, and can significantly outperform a network based on OCS only.
End-to-End Flow-Level Quality-of-Service Guarantees for Switched Networks
TL;DR: A flow-level evaluation framewok for TCP and UDP flows is developed to characterize statistical performance properties of infinite and short flows and the application layer is modeled to describe realistic protocols behavior.
References
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