Normalized Queueing Delay: Congestion Control Jointly Utilizing Delay and Marking

doi:10.1109/TNET.2008.926508

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Normalized Queueing Delay: Congestion Control Jointly Utilizing Delay and Marking

2009-04-01

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Mingyu Chen *

Xingzhe Fan

Manohar N. Murthi

Thamali Dilusha N. Wickramarathna

Kamal Premaratne

DOI：10.1109/TNET.2008.926508

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Abstract

En 中文

Depending upon the type of feedback that is primarily used as a congestion measure, congestion control methods can be generally classified into two categories: marking/loss-based or delay-based. While both marking and queueing delay provide information about the congestion state of a network, they have been largely treated with separate control strategies. In this paper, we propose the notion of the normalized queueing delay, which serves as a congestion measure by combining both delay and marking information. Utilizing normalized queueing delay (NQD), we propose an approach to congestion control that allows a source to scale its rate dynamically to prevailing network conditions through the use of a time-variant set-point. In ns-2 simulation studies, an NQD-enabled FAST TCP demonstrates a significant link utilization improvement over FAST TCP under certain conditions. In addition, we propose another NQD-based controller D + M TCP (Delay+Marking TCP) that achieves quick convergence to fair and stable rates with nearly full link utilization. Therefore, NQD is a suitable candidate as a congestion measure for practical congestion control.

Keywords:

Congestion control

Explicit Congestion Notification (ECN)

high-speed networks

TCP

transport protocols

window flow control

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