一种新型节能在线调度协议TWDM-OLT设计
A novel online scheduling protocol for energy-efficient TWDM-OLT design
摘要：
由于接入网络消耗整个互联网功耗的$80-90\%$，因此节能接入网络的设计已经成为重要的研究领域。TWDM-PON被设想为被广泛接受的未来接入技术之一。TWDM-PON提供了一个额外的机会，以节省能源在OLT以及现有的节能ONU设计。在本文中，我们专注于节能的光线路终端设计在一个波分复用无源光网络。虽然大多数传统的方法采用的波长的数量最小化，我们提出了一种新的方法，其目的是在最大限度地减少由于调度所创建的空隙的数量。在这个过程中，我们首次提出了一个低复杂度的在线调度算法的上游业务考虑延迟约束。我们广泛的模拟表明，在OLT接收器的高负载的$\sim 25\%$的能量效率的显着改善。此外，我们提供了一个分析上限的OLT接收机的能量效率，并证明该协议实现了能量效率非常接近的界限与最大偏差$\sim 2\%$为$64$ ONU。
英文摘要：
Design of energy-efficient access networks has emerged as an important area of research, since access networks consume $80-90\%$ of the overall Internet power consumption. TWDM-PON is envisaged to be one of the widely accepted future access technologies. TWDM-PON offers an additional opportunity to save energy at the OLT along with the existing energy-efficient ONU design. In this paper, we focus on the energy-efficient OLT design in a TWDM-PON. While most of the conventional methods employ a minimization of the number of wavelengths, we propose a novel approach which aims at minimizing the number of voids created due to scheduling. In the process, for the first time, we present a low-complexity on-line scheduling algorithm for the upstream traffic considering delay constraints. Our extensive simulations demonstrate a significant improvement in energy efficiency of $\sim 25\%$ for high load at the OLT receivers. Furthermore, we provide an analytical upper-bound on the energy-efficiency of the OLT receivers and demonstrate that the proposed protocol achieves an energy efficiency very close to the bound with a maximum deviation $\sim 2\%$ for $64$ ONUs.
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