IEICE Communications Express
Online ISSN : 2187-0136
ISSN-L : 2187-0136
Sleep period randomization for networked control systems over energy-efficient EPONs
Yoshiaki ManeyamaMasashi TadokoroDaisuke MurayamaManabu YoshinoKen-Ichi SuzukiRyogo Kubo
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2015 Volume 4 Issue 4 Pages 130-135

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Abstract

In recent years, with the popularization of factory automation and large-scale sensor-actuator networks, networked control systems (NCSs) over optical networks have been attracting considerable research interest. In NCSs, a delay compensator, which includes an average round-trip time (RTT) model, is implemented to improve stability and performance. However, energy-efficient networks based on cyclic sleep techniques can induce rate-dependent fluctuations in the average downstream queuing delay or the average RTT for periodically generated NCS traffic. The fluctuations result in a mismatch between the average RTT model and the actual RTT, which in turn results in destabilization and performance degradation. This letter proposes sleep period randomization methods for energy-efficient Ethernet passive optical networks (EPONs) to prevent rate-dependent fluctuations in the low-rate range. Simulation results are presented to verify the effectiveness of the proposed methods.

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© 2015 The Institute of Electronics, Information and Communication Engineers
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