On methodologies to estimate optical-layer power consumption and cost for long-haul WDM networks with optical reach constraint

Abstract

This paper deals with the methodologies to obtain the estimates of optical-layer power consumption and cost for long-haul optical networks using wavelengthdivision multiplexing (WDM) with IP-over-WDM and IPover-MPLS-over-WDM network settings. Such optical networks generally employ wavelength routing at intermediate nodes and are known as wavelength-routed optical networks (WRONs). In WRON-based long-haul networks, optical reach (OR) of a transponder represents the maximum distance over which its optical signal can travel without any optical/electrical/optical regeneration and plays a significant role in deciding the power consumption and cost of the optical layer. In IP-over-WDM network setting, IP routers are directly interfaced with WRON and bandwidth requests are equal to the lightpath capacity. In IP-over-MPLS-over-WDM network setting, IP routers are interfaced with WRON via MPLS routers and bandwidth requests arrive as labelswitched paths, which are generally lower than the lightpath capacity. We examine the above networks with mixed-OR nodes (transponders in each WRON node having different OR values but all transmitting at 10 Gbps) and fixed-OR nodes (transponders in each WRON node having same OR value and 10 Gbps transmission rate). In this investigation, two types of control planes are considered, namely unified control plane and isolated control plane. The network with unified control plane supports automated and dynamic resource provisioning for both short-term and longterm bandwidth requests. The study on nonautomated network using isolated control plane considers resource provisioning only for long-term bandwidth requests. Simulationbased network provisioning is carried out using C++, considering appropriate traffic models, OR constraints, node configurations and network architectures. The results of our simulations indicate in general how OR of the transponders can influence the total network cost and power consumption in optical layer. Overall, the nonautomated networks with mixed-OR configuration are found to save power and offer lower cost with respect to fixed-OR configuration, while the automated networks with mixed-OR configuration can save power while the cost increases with respect to fixed-OR option.Keywords IP-over-WDM · IP-over-MPLS-over-WDM · Label-switched path · Optical reach · Unified control plane · Isolated control plane · Fixed-OR · Mixed-OR

Comparison of router testbeds: embedded system-based, software-based, and multiprotocol label switching (MPLS)

“…This section presents studies that have been conducted to develop a software-based router testbed. The main simulators in the literature are Click [16][17], Minos and Data Plane Development Kit (DPDK) [18], MATLAB [19] and C++ [20].…”

“…The software router by Goswami et al [20] studied how to achieve the estimation of optical-layer power consumption and cost for a long distance optical networks using Wavelength Division Multiplexing (WDM). The test is implemented on two different networks which are IP-over-WDM and IP-over-MPLSover-WDM networks.…”

Operation algorithms for energy-efficient backbone networks

“…In [200], the authors investigated the impact of optical reach (OR) of transponders on the total network cost and power consumption in IP-over-WDM and IPover-MPLS-over-WDM networks. Therefore, mixed optical reach nodes and fixed optical reach nodes were examined for the scenarios of automated dynamic resource provisioning and non-automated provisioning.…”