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Local-Traffic-Redirection-Based Dynamic

Bandwidth Assignment Scheme for EPON

With Active Forwarding Remote Repeater Node

Chien Aun Chan, Manik Attygalle, and Ampalavanapillai Nirmalathas

Optical Communications and Networking IEEEOSA Journal of (2011)

Volume: 3, Issue: 3, Publisher: IEEE, Pages: 245–253

Presenter Chia-Cheng Chen

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Introduction EPON with an action RN LT-DBA Algorithm Simulation Results Conclusions

Outline

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Active forwarding RN(remote repeater node)◦ Increase the downstream performances using a

traffic-redirecting technique.

LT-DBA mechanism◦ Increasing the upstream utilization and reduces

the packet delay in the ONU.

Introduction

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EPON with an action RN Active RN(remote

repeater node)◦ Upstream◦ Downstream

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EPON with an action RN(cont.)

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In the first phase◦ The OLT will run the normal DBA algorithm to

allocate timeslots to corresponding ONUs.

In the second phase◦ The LT-DBA algorithm will make the decision to

excess grant a particular ONU’s assigned timeslot based on its previous upstream transmission.

LT-DBA Algorithm

LT-DBA Algorithm(cont.)

{_ ,

maxmin,

UG

kiDBAGki

Ui,k :ONU I request slot.

Gmax:Max slot can assigned for each ONU.

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LT-DBA Algorithm(cont.)

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LT-DBA Algorithm(cont.) OLT will assume that all

ONUs are within the same subnet.

Empty timeslot received on a particular time interval that is assigned to ONU x.

Empty upstream timeslot occurred for ONU x and receives frames from ONU x with destination to ONU y.

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Simulation Results

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Simulation Results(cont.)

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Simulation Results(cont.)

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Simulation Results(cont.)

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Simulation Results(cont.)

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LT-DBA mechanism incorporated with repeater-based active RNs, which is improve the upstream transmission performance from ONU to OLT.

Conclusions