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Optical Wavelength Division Multiplexing (WDM) networks based on fixed grid technology have exposed some questions, including wasting of bandwidth resources in multi-domain heterogeneous networks. Flexible grid technologies can provide end-to-end optical path according to the client flexibly and effectively. However, it is unpractical to deploy a one-time green-field flexible grid technologies subjected...
Bandwidth-intensive applications and services are constantly and directly driving the requirement for enabling backbone networking infrastructures to support extremely high bandwidth demands due to diverse data traffic flows. Optical transmission bearers utilizing dense wavelength division multiplexing (DWDM) coupled with optical burst switching (OBS) have provided a sufficing transmission as well...
In this paper, a protection algorithm for elastic optical networks is proposed. The proposed algorithm takes into account the power consumption of the routes and the physical layer impairments to choose the working and protection routes. A performance evaluation study is carry out comparing the proposed algorithm with other algorithms presented in the literature. In general, the results show a good...
Energy consumption and the associated costs constitute a crucial issue concerning the design and operation of data networks and data centers. Energy-awareness is required in all levels, ranging from physical layer to algorithms, protocols and applications. Architecture-wise, a promising solution for tackling the increasing energy requirements is the deployment of optics at both long and shorter distances,...
In this paper, the novel shortest energy consumption Routing Spectrum Assignment (SEC-RSA) algorithm based on Distance Adaptive Modulation (DAM) is introduced. According to the distance between source and destination for a determinate lightpath the modulation pattern is modified. The energy consumption is computed for the k-shortest path, then the one with lowest energy consumption is adopted. The...
Energy aware routing schemes for wavelength division multiplexing (WDM) optical networks can significantly reduce the overall energy consumption compared to other technologies. Much of the recent work has concentrated on switching off unused network components during low utilization periods. In this study, we present a comprehensive heuristic algorithm that performs routing and wavelength assignment...
This work investigates different network design considerations with respect to energy-efficiency, under green-field resilient multi-layer network deployment. The problem of energy efficient, reliable multi-layer network design is known to result in different trade-offs between key performance measures. In this complex problem, considerations such as client traffic granularity, applied grooming policies...
The rise of big data and cloud computing applications is driving an explosion in the growth of data centers (DCs), and is already resulting in networking bottlenecks and performance degradation. The size and capacity of DCs are being constrained by the traditional packet-based switching architectures due to high energy consumption.
The evolution of novel access networks is dominated by two major changes: first, an increasing convergence of fixed optical and mobile wireless access networks (driven by the industry interested in mutualizing infrastructure); and secondly, a surge in video traffic (expected to represent 80 percent of all consumer Internet traffic in 2019). This motivates the introduction of video delivery optimization...
We investigated the cache allocation and replacement problems in CCN within a single ISP and propose the scheme called Tube Caching that can dynamically distribute contents across the forwarding paths based on the energy-related benefit. Through the preliminary evaluations, Tube Caching has been proven to be effective.
This paper studies energy-efficient protection for asymmetric traffic in Elastic Optical Networks (EONs). Directed pre-configured Cycles (p-Cycles) are designed to protect directional traffic with flexible spectrum allocation and adaptive modulation formats. A Mixed Integer Linear Programming (MILP) model is formulated to minimize total energy consumption while generating directed p-cycles without...
The paper focuses on dynamic resource provisioning in an all optical wide area Software Defined Network supporting energy-aware interplay between fog and cloud. The main contribution of this paper is a latencyAware policy for handling fog related traffic. The policy is combined with anycast strategies in order to form a complete approach able to handle fog and cloud traffic simultaneously. The proposed...
The growth of data traffic in telecommunication networks has increased the power consumption and its saving has become a key issue in planning and management of telecommunication networks. On the other hand, to guarantee availability and reliability, core optical networks have redundant resources to support extra traffic demand or infrastructure fault. The dedicated path protection (DPP) is an effective...
The continuous growth of the Internet in the last decade has contributed to an unprecedented increase of the total amount of energy consumed by telecommunication networks worldwide. In this context, Wavelengths Division Multiplexed networks, besides providing benefits in terms of high transport capacity, have been recognized as an effective solution to achieve substantial power savings in core transport...
With the emergence of the Future Internet and the dawning of new IT models such as cloud computing, the usage of data centers (DC), and consequently their power consumption, increase dramatically. Besides the ecological impact, the energy consumption is a predominant criteria for DC providers since it determines the daily cost of their infrastructure. As a consequence, power management becomes one...
We solve the problem of datacenter placement in optical cloud networks with the aim of jointly minimizing the non-renewable datacenter energy consumption and the number of DCs. Lexicographic optimization is utilized to balance the two objectives.
In this paper we present a software system that is being developed at the University of Leeds for simulating and optimizing energy efficient optical core networks. The system is called CORNETO, an acronym for CORe NETwork Optimization. The software implements many of the energy saving concepts, methods and computational heuristics that have been produced by the ongoing INTERNET, INTelligent Energy...
Optical switching technologies have been attracting much attention because of the potential to save the cost and energy consumption. However, optical switching technologies have not been extensively used in the networks so far, while optical transmission technologies have been deployed widely. This paper figures out that the energy consumption of communication networks is going to rapidly increase...
We propose a multi-layer energy saving technique for optical core networks that aims at reducing energy consumption by powering off components in different layers of the network After obtaining satisfactory results in saving energy by powering off ports in the IP layer in our previous work in this paper we target more savings by considering additional layers in the network. The model proposed in this...
Core networks offer high capacities by harvesting the high bandwidth-distance product of optical technologies. However they consume a non-negligible amount of power, while their traffic volume is forecasted to grow at very high rates for the 10 or 15 coming years. Thus, energy-efficiency in core and metro networks is mandatory for the sustainability of the future Internet. In this context, in this...
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