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- W2912116565 abstract "Data flow control is commonly based on window protocols and control mechanisms distributed throughout a network. Previous investigations of flow control mechanisms have focused on steady state behavior using Poisson arrivals, exponential service times, and packet independence assumptions. These assumptions limit applicability of the results by ignoring dynamic behavior due to physical path dependencies, inherent deterministic behavior of the protocols, and the protocol behavior under load. Dynamic behavior of these protocols is much more difficult to characterize and has not received much attention to date.This dissertation presents an analysis technique that allows a precise description of the dynamic behavior of window protocols. This analysis technique allows both the deterministic behavior of the protocol and the deterministic influence of the physical path characteristics to be explicitly considered during steady state and transient protocol operation. Also, an insightful characterization of fundamental cyclic window protocol activity is developed.Analysis shows that when unencumbered by control algorithms, the feedback mechanisms associated with window protocols make them inherently cyclic. This surfaces as deterministic behavior when they are operating under load over a fixed path. Results reveal that cyclic window protocol activity, along with physical path delays and the value of the window size, impact both transfer time and queue sizes. Transfer times are found to be erratic for some window schemes because of packet bunching due to greedy sender transmission activity. Queues often appear near a protocol sender then migrate farther downstream as data transfer continues. This queue migration continues until, often, a permanent queue forms at the bottleneck. Surprisingly, total packet queue time is an invariant during the queue migration process.We conclude this research by allowing a control function to influence the window size. The focus here, is on the application of our deterministic analysis technique to a current virtual circuit flow control implementation. Queue size feedback to the virtual circuit sender results in compensating window size changes. Window size activity, because of the decentralized nature of flow control implementations, exhibits complicated dynamic behavior. This behavior can be reproduced, analyzed, and matched to empirical data using our deterministic analysis technique." @default.
- W2912116565 created "2019-02-21" @default.
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- W2912116565 date "1989-01-01" @default.
- W2912116565 modified "2023-09-26" @default.
- W2912116565 title "Window dynamics" @default.
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