Low-Latency Polling Schemes for Long-Reach Passive Optical Networks

• Published in: IEEE transactions on communications Vol. 61; no. 7; pp. 2936 - 2945
• Main Authors: Kiaei, M., Fouli, K., Scheutzow, M., Maier, M., Reisslein, M., Assi, C.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.07.2013; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Allocations; Applied sciences; Bandwidth; Bandwidths; Business and industry local networks; Delay; Delay analysis; Delays; Dynamic tests; ethernet PON; Exact sciences and technology; Frames; Logic gates; long-reach PON; Mathematical analysis; Message systems; multi-thread polling; Networks and services in france and abroad; Optical communication; Optical fiber communications; Optical network units; Optical telecommunications; Organization, operation and development plans; Passive optical networks; Propagation delay; Radiocommunications; real-time polling; Real-time systems; Simulation; Studies; Telecommunications; Telecommunications and information theory; Teleprocessing networks. Isdn; Performance evaluation; Polling; Scheduling; Passive optical network; ethernet PON; Bandwidth allocation; Delay analysis; Optical fiber network; real-time polling; Dynamic allocation; Simulation; Just in time; Idle time; Ethernet; Analytical method; long-reach PON; Optical fiber communication; Delay time; Resource management; multi-thread polling
• ISSN: 0090-6778; 1558-0857
• DOI: 10.1109/TCOMM.2013.061013.120097

The increased propagation delay of future long-reach passive optical networks (LR-PONs) may lead to a significantly increased idle time and delay if optical network units (ONUs) use conventional report-grant mechanisms. Sophisticated and efficient bandwidth allocation mechanisms are required to cope with the imposed propagation delay in LR-PONs. In this study, we evaluate three dynamic bandwidth allocation (DBA) frameworks in terms of frame (packet) delay; namely, we consider conventional (interleaved) polling for traditional PON and two recently introduced scheduling paradigms for next generation LR-PON, i.e., multi-thread polling (MT-P) and real-time polling (RT-P). We enhance MT-P and RT-P by applying the just-in-time framework. Next, we provide an analytical framework for evaluating the end-to-end frame delay in our enhanced MT-P and RT-P frameworks. We compare their performance with conventional polling and double-phase polling and investigate their shortcomings and advantages in an LR-PON setting. The simulation results closely match the analysis for this framework. Also, our results indicate that RT-P significantly reduces frame delay in LR-PONs compared to MT-P and conventional polling frameworks.