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Dynamic bandwidth allocation in heterogeneous WDM EPONs

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Abstract

Several dynamic bandwidth allocation algorithms have been introduced to schedule upstream wavelength channels in wavelength division multiplexing Ethernet passive optical networks (WDM EPONs), but mostly for homogenous WDM EPON networks with the same distance between each optical network unit (ONU) and the optical line terminal. For WDM EPON with heterogeneous round trip times (RTTs), we propose two algorithms for ONU scheduling, called nearest first and early allocation (EA); and a wavelength assignment algorithm, called best fit (BF). Both ONU scheduling algorithms take RTT dissimilarities into account, thus minimizing packet delay and packet drop ratio at ONUs. Additionally, EA can relive the common drawback of offline scheduling, i.e., channel idle time. On the other hand, the BF wavelength assignment is proposed that assigns the best wavelength to each ONU in order to improve network performances in terms of packet queuing delay and packet drop ratio at ONU sides.

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Authors and Affiliations

  1. Computer Networks Research Lab, Electrical Engineering Technologies Research Center, Sahand University of Technology, Sahand New Town, Tabriz, Iran

    Ali Razmkhah & Akbar Ghaffarpour Rahbar

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  1. Ali Razmkhah
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  2. Akbar Ghaffarpour Rahbar
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Correspondence to Akbar Ghaffarpour Rahbar.

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Razmkhah, A., Rahbar, A.G. Dynamic bandwidth allocation in heterogeneous WDM EPONs. Telecommun Syst 60, 393–403 (2015). https://doi.org/10.1007/s11235-015-0053-2

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