Dynamic Wavelength and Bandwidth Allocation in Hybrid TDM/WDM EPON Networks

Dhaini, Ahmad R.; Assi, Chadi; Maier, Martin; Shami, Abdallah

doi:10.1109/jlt.2006.886683

Cited by 176 publications

(83 citation statements)

References 13 publications

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“…10G-EPON [6], [7] and XG-PON [8], [9], in which the bandwidth of entire existing GE-PON and G-PON networks is upgraded from 1 Gbps to 10 Gbps, are expected to be introduced, and the standardization of 10G-EPON technology by IEEE802.3av is progressing and is expected to be completed by 2009 [18], [19]. On the other hand, as another next-generation PON, WDM GE-PON [22], in which WDM functions have been added to transmitters/receivers in conventional GE-PON using couplers, has been attracting attention and discussed in ITU-T as a next-generation access (NGA) [18], [19]. WDM GE-PON can increase the number of wavelengths or capacity by using WDM with practically no changes to the existing optical infrastructure or protocols.…”

Section: G-epon Xg-pon and Wdm-ponmentioning

confidence: 99%

Optical Access Architecture Designs Based on WDM-Direct toward New Generation Networks

Miyazawa

Harai

2010

IEICE Trans. Commun.

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SUMMARYWe present our proposed designs of optical access architecture based on WDM technology toward new-generation networks for two types of topologies: Single-star (SS) and passive-double-star (PDS). We adopt the concept of WDM-direct which links multiple wavelengths to each optical network unit (ONU). Our proposed architecture based on WDM-direct can achieve more than 10 Gbps access per ONU. Moreover, our architecture can provide not only conventional bandwidth-shared services but also bandwidth-guaranteed services requiring more than 10 Gbps bandwidth by establishing end-to-end lightpaths directly to each ONU, and thus meet high requirements of QoS in new-generation networks. Firstly, we show our proposed designs of SS-type architecture, and experimentally demonstrate the system. We confirm that the optical line terminal (OLT) successfully switches between packet/lightpath data transmissions for each ONU. In addition, we measure and evaluate optical power loss in upstream/downstream transmissions between the OLT and ONUs. Secondly, we show our proposed designs of PDS-type architecture, and theoretically analyze and evaluate the bit-rate capacity of the system.

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Section: G-epon Xg-pon and Wdm-ponmentioning

confidence: 99%

Optical Access Architecture Designs Based on WDM-Direct toward New Generation Networks

Miyazawa

Harai

2010

IEICE Trans. Commun.

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“…More recently, some excess bandwidth distribution techniques originally proposed for single-channel EPONs have been investigated in the context of Wavelength Division Multiplexing (WDM) EPONs with several upstream transmission channels [13]. The performance evaluation in [13] includes comparisons of excess bandwidth distribution with some form of IPACT, namely the Single Table extension of IPACT to WDM [14].…”

Section: Related Workmentioning

confidence: 99%

“…The performance evaluation in [13] includes comparisons of excess bandwidth distribution with some form of IPACT, namely the Single Table extension of IPACT to WDM [14]. Specifically, the Gated allocation of IPACT, where the grant is set equal to the ONU request, without any upper limit, was considered.…”

Section: Related Workmentioning

confidence: 99%

“…We refer to this combined excess bandwidth distribution scheme as Iterative. We consider this Iterative scheme in conjunction with (a) the offline scheduling framework, whereby all ONU Reports need to be received at the OLT before commencing the dynamic bandwidth allocation, as well as (b) the ONU load status hybrid scheduling framework (referred to as DWBA-2 in [13]), whereby underloaded ONUs receive their grant (online) immediately and the excess bandwidth distribution is executed for the overloaded ONUs (offline), once all the Report messages have been received. Note that in both cases, the excess bandwidth distribution operates in offline fashion, in that the excess is allocated only after all ONU Reports for the present cycle have been received.…”

Section: Comparison Of Ipact-limited and Offline Excess Bandwidth Dismentioning

confidence: 99%

“…Note that in both cases, the excess bandwidth distribution operates in offline fashion, in that the excess is allocated only after all ONU Reports for the present cycle have been received. We note that we do not consider DBA-3 from [13], which allocates overloaded ONUs (online) immediately the maximum grant size, and then additional excess bandwidth in offline fashion, because of its increased complexity, limited delay reductions, and increased wasted bandwidth, as evaluated in [13].…”

Section: Comparison Of Ipact-limited and Offline Excess Bandwidth Dismentioning

confidence: 99%

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When Are Online and Offline Excess Bandwidth Distribution Useful in EPONs?

Ferguson

McGarry

Reisslein

2009

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

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Abstract. Excess bandwidth distribution techniques have recently been proposed to improve the dynamic bandwidth allocation in EPONs. We compare existing offline excess bandwidth distribution with conventional IPACT Limited in terms of packet delay performance. We identify the factors that result in packet delay reduction with excess bandwidth distribution compared to IPACT-Limited and discover that existing offline excess distribution mechanisms become unstable at moderate to high loads in long-range EPONs with large round trip propagation delays. We propose and evaluate a novel Online Excess Bandwidth Distribution (OEBD) mechanism to provide stable excess bandwidth distribution even at high loads in long-range EPONs.

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