Upstream traffic capacity of a WDM EPON under online GATE-driven scheduling

TL;DR

This paper introduces a novel dynamic bandwidth allocation algorithm for WDM EPONs that improves upstream traffic capacity and delay performance, especially in long-reach networks with high propagation delays.

Contribution

It proposes a simple, efficient DBA algorithm that emulates a multi-server polling system and derives capacity formulas applicable to general traffic.

Findings

The new scheduler outperforms classical approaches in delay performance.

The algorithm is particularly effective in long-reach networks with high propagation delays.

Simulation results confirm the superiority of the proposed method.

Abstract

Passive optical networks are increasingly used for access to the Internet and it is important to understand the performance of future long-reach, multi-channel variants. In this paper we discuss requirements on the dynamic bandwidth allocation (DBA) algorithm used to manage the upstream resource in a WDM EPON and propose a simple novel DBA algorithm that is considerably more efficient than classical approaches. We demonstrate that the algorithm emulates a multi-server polling system and derive capacity formulas that are valid for general traffic processes. We evaluate delay performance by simulation demonstrating the superiority of the proposed scheduler. The proposed scheduler offers considerable flexibility and is particularly efficient in long-reach access networks where propagation times are high.