Flow-Level Fair Queue Management Scheme Stabilizing Buffer Utilization
Flow-Level Fair Queue Management Scheme Stabilizing Buffer Utilization
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DOI：
10.1587/transcom.e92.b.2838
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发表时间：
2009-09
期刊：
影响因子：
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通讯作者：
Y. Shinohara;Norio Yamagaki;H. Tode;K. Murakami
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文献类型：
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作者：
Y. Shinohara;Norio Yamagaki;H. Tode;K. Murakami
随着宽带网络的出现，互联网上的多媒体流量正在迅速增加。然而，与互联网协议（IP）网络一起使用的Best-Effort （BE）服务从未打算保证每个用户的服务质量（QoS）。因此，QoS保证的实现成为一个非常重要的问题。之前，我们提出了一种队列管理方案，称为双指标公平排队（DMFQ），以提高公平性和保证QoS。DMFQ通过考虑每个流所消耗的瞬时和历史网络资源的数量来提高公平性和吞吐量。此外，由于DMFQ是面向硬件的，因此具有高速和高可扩展性的特点。然而，由于DMFQ的设置参数是静态的，因此可能无法适应网络的波动。此外，DMFQ无法支持多类环境。本文提出了一种新的基于DMFQ的缓冲区管理方案，该方案能够灵活地适应网络条件并提供分类服务。该方案通过控制缓冲区阈值，将缓冲区利用率稳定在一个固定的范围内，而缓冲区阈值会影响计算出的丢包概率。此外，将该方案应用于差分服务（DiffServ），实现了缓冲区的优先级管理。
Multimedia traffic on the Internet is rapidly increasing with the advent of broadband networks. However, the Best-Effort (BE) service used with Internet Protocol (IP) networking was never intended to guarantee Quality of Service (QoS) for each user. Therefore, the realization of QoS guarantees has become a very important issue. Previously, we have proposed a queue management scheme, called Dual Metrics Fair Queuing (DMFQ), to improve fairness and to guarantee QoS. DMFQ improves fairness and throughput by considering the amount of instantaneous and historical network resources consumed per flow. In addition, DMFQ has characteristics of high speed and high scalability because it is hardware oriented. However, DMFQ may be unable to adapt to network fluctuations, given that it has static setup parameters. Moreover, DMFQ is unable to support a multiclass environment. In this paper, we propose a new buffer management scheme based on DMFQ that can adapt flexibly to network conditions and can provide classified services. The proposed scheme stabilizes buffer utilization within a fixed range by controlling the buffer threshold, which affects the calculated packet discard probability. Moreover, by applying the proposed scheme to Differentiated Services (DiffServ), we achieve prioritized buffer management.