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Article

A QoS-Aware Dynamic Bandwidth Allocation Algorithm for Passive Optical Networks with Non-Zero Laser Tuning Time

1
Department of Network Engineering, Universitat Politècnica de Catalunya (UPC), 08860 Castelldefels, Spain
2
Department of Computer and Communication Engineering, Lebanese International University (LIU), Beirut 14404, Lebanon
*
Author to whom correspondence should be addressed.
Photonics 2021, 8(5), 159; https://doi.org/10.3390/photonics8050159
Received: 30 March 2021 / Revised: 29 April 2021 / Accepted: 30 April 2021 / Published: 10 May 2021
The deployment of new 5G services and future demands for 6G make it necessary to increase the performance of access networks. This challenge has prompted the development of new standardization proposals for Passive Optical access Networks (PONs) that offer greater bandwidth, greater reach and a higher rate of aggregation of users per fiber, being Time- and Wavelength-Division Multiplexing (TWDM) a promising technological solution for increasing the capacity by up to 40 Gbps by using several wavelengths. This solution introduces tunable transceivers into the Optical Network Units (ONUs) for switching from one wavelength to the other, thus addressing the ever-increasing bandwidth demands in residential broadband and mobile fronthaul networks based on Fiber to the Home (FTTH) technology. This adds complexity and sources of inefficiency, such as the laser tuning time (LTT) delay, which is often ignored when evaluating the performance of Dynamic Bandwidth Allocation (DBA) mechanisms. We present a novel DBA algorithm that dynamically handles the allocation of bandwidth and switches the ONUs’ lasers from one wavelength to the other while taking LTT into consideration. To optimize the packet delay, we introduce a scheduling mechanism that follows the Longest Processing Time first (LPT) scheduling discipline, which is implemented over the Interleaved Polling with Adaptive Cycle Time (IPACT) DBA. We also provide quality of service (QoS) differentiation by introducing the Max-Min Weighted Fair Share Queuing principle (WFQ) into the algorithm. The performance of our algorithm is evaluated through simulations against the original IPACT algorithm, which we have extended to support multi-wavelengths. With the introduction of LPT, we obtain an improved performance of up to 73% reduction in queue delay over IPACT while achieving QoS differentiation with WFQ. View Full-Text
Keywords: passive optical networks; laser tuning time; TWDM; Dynamic Bandwidth Allocation; optical access networks; scheduling passive optical networks; laser tuning time; TWDM; Dynamic Bandwidth Allocation; optical access networks; scheduling
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MDPI and ACS Style

Zehri, M.; Haastrup, A.; Rincón, D.; Piney, J.R.; Sallent, S.; Bazzi, A. A QoS-Aware Dynamic Bandwidth Allocation Algorithm for Passive Optical Networks with Non-Zero Laser Tuning Time. Photonics 2021, 8, 159. https://doi.org/10.3390/photonics8050159

AMA Style

Zehri M, Haastrup A, Rincón D, Piney JR, Sallent S, Bazzi A. A QoS-Aware Dynamic Bandwidth Allocation Algorithm for Passive Optical Networks with Non-Zero Laser Tuning Time. Photonics. 2021; 8(5):159. https://doi.org/10.3390/photonics8050159

Chicago/Turabian Style

Zehri, Mohammad, Adebanjo Haastrup, David Rincón, José R. Piney, Sebastià Sallent, and Ali Bazzi. 2021. "A QoS-Aware Dynamic Bandwidth Allocation Algorithm for Passive Optical Networks with Non-Zero Laser Tuning Time" Photonics 8, no. 5: 159. https://doi.org/10.3390/photonics8050159

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