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Analysis of Impact of TXOP Allocation on IEEE 802.11e EDCA under Variable Network Load

机译:可变网络负载下TXOP分配对IEEE 802.11e EDCA的影响分析

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摘要

In this paper, we investigate the impact of transmission opportunity (TXOP), arbitration interframe space (AIFS), and contention window on the performance of an IEEE 802.11e cluster with four traffic classes under Poisson frame arrivals. We derive an analytical model of the cluster using queuing model of individual nodes, discrete time Markov chain, and probabilistic modeling of the backoff process. The analytical model demonstrates the complex interaction between TXOP, on one side, and AIFS and contention window, on the other. We derive saturation and stability points for all traffic classes and discuss their dependency on TXOP allocations. Our results indicate that use of nonzero TXOP parameter under Poisson frame arrivals improves performance slightly by separating points of saturation and instability. More substantial performance improvements should be expected by deploying TXOP differentiation under bursty traffic. Since all traffic classes need to operate in stable, nonsaturated regime, this work has important implications for the design of congestion control and admission control schemes in IEEE 802.11e clusters.
机译:在本文中,我们研究了传输机会(TXOP),仲裁帧间间隔(AIFS)和争用窗口对在Poisson帧到达下具有四个流量类别的IEEE 802.11e群集性能的影响。我们使用单个节点的排队模型,离散时间马尔可夫链和退避过程的概率模型来导出集群的分析模型。该分析模型演示了一侧的TXOP与另一侧的AIFS和竞争窗口之间的复杂交互。我们导出所有流量类别的饱和度和稳定性点,并讨论它们对TXOP分配的依赖性。我们的结果表明,在Poisson帧到达下使用非零TXOP参数可以通过分离饱和点和不稳定点来稍微改善性能。通过在突发流量下部署TXOP差异,可以期望实现更大的性能改进。由于所有流量类别都需要在稳定的非饱和状态下运行,因此这项工作对IEEE 802.11e群集中的拥塞控制和准入控制方案的设计具有重要意义。

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