Interleaved polling versus multi-thread polling for bandwidth allocation in long-reach PONs

Long-reach passive optical networks (LR-PONs) suffer from extremely long propagation delays that degrade the performance of centralized algorithms proposed for upstream bandwidth allocation in traditional PONs. This is because these algorithms are based on bandwidth negotiation messages frequently exchanged between the optical line terminal in the central office and optical network units near the users, which become seriously delayed when the network is extended causing the performance to degrade. In this paper, we review and analyze two centralized dynamic bandwidth allocation algorithms, online interleaved polling and offline multi-thread polling that was recently proposed in the literature for LR-PONs. We investigate and compare their performances together in detail, by studying and observing their elemental delays. Unexpectedly, simulation results show that, although multi-thread polling succeeds in decreasing reporting and queueing delays, interleaved polling keeps a lower grant delay and therefore has better overall delay performance. The latter also achieves better throughput compared to multi-thread polling.

[1]  Biswanath Mukherjee,et al.  Long-reach optical access networks: A survey of research challenges, demonstrations, and bandwidth assignment mechanisms , 2010, IEEE Communications Surveys & Tutorials.

[2]  Biswanath Mukherjee,et al.  IPACT: A dynamic protocol for an Ethernet PON (EPON) , 2002, IEEE Commun. Mag..

[3]  Biswanath Mukherjee,et al.  Multi-Thread Polling: A Dynamic Bandwidth Distribution Scheme in Long-Reach PON , 2007, IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference.

[4]  Hussein T. Mouftah,et al.  A survey of dynamic bandwidth allocation algorithms for Ethernet Passive Optical Networks , 2009, Opt. Switch. Netw..

[5]  John E. Mitchell,et al.  Architecture to integrate multiple PONs with long reach DWDM backhaul , 2009, IEEE Journal on Selected Areas in Communications.

[6]  C.W. Chow,et al.  Long Reach Passive Optical Networks , 2007, LEOS 2007 - IEEE Lasers and Electro-Optics Society Annual Meeting Conference Proceedings.

[7]  Mário M. Freire,et al.  Ethernet Passive Optical Networks , 2005 .

[8]  Yoichi Maeda,et al.  Standardization trends and prospective views on the next generation of broadband optical access systems , 2010, IEEE Journal on Selected Areas in Communications.

[9]  Lei Shi.  Energy-Efficient Long-Reach Passive Optical Networks , 2012 .

[10]  M.A. Ali,et al.  A novel decentralized ethernet-based PON access architecture for provisioning differentiated QoS , 2004, Journal of Lightwave Technology.

[11]  Martin Reisslein,et al.  Ethernet passive optical network architectures and dynamic bandwidth allocation algorithms , 2008, IEEE Communications Surveys & Tutorials.