Modeling the DOCSIS 1.1/2.0 MAC protocol

Proceedings. 12th International Conference on Computer Communications and Networks (IEEE Cat. No.03EX712) Pub Date : 2003-10-20 DOI:10.1109/ICCCN.2003.1284171

Jim Martin, Nitin Shrivastav

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引用次数: 18

Abstract

A model of the data over cable (DOCSIS) version 1.1/2.0 MAC and physical layers using the ns simulation package is developed. In this paper we present the results of a performance analysis that we have conducted using the model. The main objective of our study is to examine the performance impact of several key MAC layer system parameters as traffic loads are varied. We focus on the DOCSIS best effort service. We measure the level of ACK compression experienced by a downstream TCP connection and show that even under moderate load levels DOCSIS can cause TCP acknowledgement packets to compress in the upstream direction leading to bursty (and lossy) downstream dynamics. We explore the use of downstream rate control on network performance and find that it does reduce the level of ACK compression for moderate load levels compared to an equivalent network scenario without rate control. However, as the number of active subscribers on a given channel increase, the level of ACK compression grows implying that other mechanisms should be looked at to improve performance during periods of high usage.

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DOCSIS 1.1/2.0 MAC协议建模

利用ns仿真包建立了DOCSIS 1.1/2.0 MAC和物理层模型。在本文中，我们介绍了我们使用该模型进行的性能分析的结果。我们研究的主要目的是检查几个关键的MAC层系统参数随着流量负载的变化对性能的影响。我们专注于DOCSIS的最佳服务。我们测量了下游TCP连接所经历的ACK压缩水平，并表明即使在中等负载水平下，DOCSIS也会导致TCP确认数据包在上游方向压缩，从而导致突发(和有损)下游动态。我们探索了在网络性能上使用下行速率控制，并发现与没有速率控制的等效网络场景相比，它确实降低了中等负载水平下的ACK压缩水平。但是，随着给定通道上活动订阅者数量的增加，ACK压缩的级别也会增加，这意味着应该考虑其他机制，以便在高使用率期间提高性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings. 12th International Conference on Computer Communications and Networks (IEEE Cat. No.03EX712)

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