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Towards a Bufferless Optical Internet
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DOI：10.1109/JLT.2009.2017211.png)
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Abstract
En 中文
This paper investigates the relationship between buffer size and long-term average TCP performance in dense wavelength division multiplexing (DWDM) networks. By investigating TCP NewReno, we demonstrate that buffer requirements are related to the number of wavelength channels at a bottleneck. With sufficient wavelengths, high throughput can be obtained with a buffer of one packet per channel; furthermore, there may be situations where an entirely bufferless optical packet switching (OPS) will become feasible. For this study, we develop new evaluation tools. First, we propose a method based on a two-part analytical model, with a new open loop component which approximates packet discarding in a bottleneck DWDM switch, and a closed loop fixed-point which reflects the impact of TCP. This analytical method provides accurate and scalable approximations of throughput and packet loss rate that can be used as part of a tool for DWDM network and switch design. Second, we propose an extrapolation technique to allow simulation of TCP over long ultra-high bit rate links, avoiding the intractable processing and memory requirements of direct simulation. This extrapolation technique enables us to validate the analytical model for arbitrarily high bit rate scenarios.
Keywords:
Bufferless optical packet switching (OPS)
dense wavelength division multiplexing (DWDM) network
TCP
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4.8
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