Network Planning

Accepted paper for presentation in IFIP Networking 2018

An M:N Shared Regenerator Protection Scheme in Translucent WDM Networks by Elias A. Doumith and Sawsan Al Zahr.

Abstract: Most studies addressing translucent network design targeted a tradeoff between minimizing the number of deployed regenerators and minimizing the number of regeneration nodes. The latter highly depends on the carrier’s strategy and is motivated by various considerations such as power consumption, maintenance and supervision costs. However, concentrating regenerators into a small number of nodes exposes the network to a high risk of data loss in the eventual case of regenerator pool failure. In this paper, we address the problem of survivable translucent network design taking into account the simultaneous effect of four transmission impairments. We propose an exact approach based on a mathematical formulation to solve the problem of regenerator placement while ensuring the network survivability in the hazardous event of a regenerator pool failure. For this purpose, for each accepted request requiring regeneration, we determine several routing paths along with associated valid wavelengths going through different regeneration nodes. In doing so, we implement an M:N shared regenerator protection scheme. Simulation results highlight the gain obtained by reducing the number of regeneration nodes without sacrificing network survivability.

From Network Planning to Traffic Engineering in Multi-layer Networks

From Network Planning to Traffic Engineering in Multi-layer Networks
From Network Planning to Traffic Engineering in Multi-layer Networks
A Focus on Grooming and Rerouting Strategies
Elias A. Doumith
LAP Lambert Academic Publishing
ISBN-13: 978-3-8465-2777-1
ISBN-10: 3846527777
EAN: 9783846527771

Abstract: High-performance transport networks are expected to support applications with various types of traffic flows (permanent, scheduled, bursty, and noisy). Since high-performance networks usually employ optical network infrastructures and since most applications require sub-wavelength bandwidth, several streams are groomed on the same wavelength. It is therefore important that such networks are designed in an optimal way in terms of cost while efficiently supporting these types of traffic. This book deals with the design and analysis of optical networks allowing for traffic engineering including grooming and rerouting functionalities. Both deterministic and random traffic scenarios are considered. Under deterministic traffic conditions, optimal as well as accurate heuristic approaches are developed for network design and operation. Under random traffic conditions, the dynamic routing and grooming problem is considered subject to the availability of free network resources. Several algorithms are developed to facilitate this provisioning problem. At last, rerouting techniques and their implementation are addressed in order to enhance network efficiency under specific traffic scenarios.

Keywords: Traffic Engineering, Network Design, Routing and Wavelength Assignment, Optimization Techniques, Traffic Grooming, Rerouting Strategies, Multi-layer Network, ILP Formulation, Meta-heuristic Approaches, Scheduled Traffic Demands, Random Traffic Demands

Accepted paper for presentation in Globecom 2011

Power-Aware Multi-Rate WDM Network Design under Static/Dynamic Traffic by Mayssa Youssef, Elias A. Doumith, and Maurice Gagnaire.

Abstract: Power-awareness in carriers’ networks has become a major concern in the past few years due to the increasing power consumption required by high speed electronics. Today, the scalability of the Internet is not only limited by communication technology but also by operational expenditure induced by electrical power needed to feed and cool switching/routing and transmission equipment. Designing low power network equipment is certainly the most effective solution to reduce unnecessary power dissipation due to the Joule effect. In the short-term, alternative solutions targeting the existing infrastructures must be provided until the emergence of green-networking technologies. Recently, innovative approaches based on traffic rerouting and grooming have been proposed in the literature for core WDM networks. Transceivers used at the optical switching nodes for add-drop and grooming purposes are the key elements conditioning power consumption. In current networks, transceivers are powered-on permanently, whatever the activity of the data sources at the electrical layer. In this paper, we aim to minimize network’s power consumption assuming transceivers with fixed data rates. In this context, we propose an optimal mapping of a set of scheduled traffic demands at the electrical layer onto the optical network. The number of optical channels per optical fiber being upper-bounded, this mapping also minimizes connections’ rejection. This optimization problem is formulated as an Integer Linear Program.

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