基于随机定时Petri网的DQDB协议建模与评价

Proceedings of International Workshop on Modeling, Analysis and Simulation of Computer and Telecommunication Systems Pub Date : 1994-01-31 DOI:10.1109/MASCOT.1994.284411

R. L. R. Carmo, G. Juanole

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引用次数: 5

摘要

作者的目标是提出一种基于随机定时Petri网的建模方法，允许对协议DQDB进行详尽的分析。该方法以结构化模型和抽象概念为基础。对队列仲裁(QA)机制分析的一个新贡献是通过建模过程确定到达节点的空槽的时间分布函数(我们考虑了请求到达过程和空槽到达过程之间的相关性)。研究还指出:质量保证机制的不公平;通过引入BWB机制及其对应机制来控制这种不公平(可能出现带宽浪费);当考虑PA访问时，QA机制的不公平性增加。

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Modeling and evaluating the DQDB protocol with stochastic timed Petri nets

The goal of the authors is to present a modeling methodology based on the stochastic timed Petri nets that allows an exhaustive analysis of the protocol DQDB. This methodology is based on structured models and abstraction concept. A new contribution to the analysis of the queue arbitrated (QA) mechanism is the determination by the modeling process of the time distribution function of the empty slots which arrive at a node (we take into account the correlation between the request arrival process and the empty slot arrival process). The study also points out: the unfairness of the QA mechanism; the control of this unfairness by introducing the BWB mechanism and also a counterpart of this mechanism (the bandwidth wastage can appear); and the increase of unfairness of the QA mechanism when the PA access is considered.<>

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Proceedings of International Workshop on Modeling, Analysis and Simulation of Computer and Telecommunication Systems

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