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In this work we investigate a new solution dealing with the increase of IP networks energy efficiency. The starting point of this work is Table Lookup Bypass (TLB), a new mechanism to reduce the energy consumption of a linecard overcoming the simple switch-off of network elements: TLB consists in bypassing the lookup operation performed by a router linecard and forwarding the incoming packets on a...
It is our great pleasure to welcome all participants in this 24th edition of the Tyrrhenian International Workshop on Digital Communications (TIWDC 2013), dedicated to Green Information and Communications Technology (Green ICT). The TIWDC series of Workshops started as an annual international forum on Digital Communications, located in Tirrenia, near Pisa. Since the late '90s, the Workshop has become...
We describe the new European project E-CROPS which was ranked first in the 2012 CHIST-ERA competition. This project has begun its work in February 2013 to develop a system-wide approach to using energy harvesting and smart energy management technologies in communication and mobile devices. The project will examine energy-dependent fundamental limits of communications, together with the timely harvesting,...
While reducing the power consumption of cellular systems is an important objective, the field lacks a good power model in order to evaluate the different power-saving options. This paper motivates the need for such a model by looking at the requirements in flexibility as well as the shortcomings of existing models. A new power model structure is proposed in order to assess the power consumption of...
In this paper, we assess the energy efficiency of various optical access solutions including both the telecom operator and the end user side. We compare different next-generation passive optical networks (NG-PONs) to a baseline GPON deployment offering similar bandwidths and Quality of Service (QoS) for best-effort high speed connectivity services. For the operator side, we follow two approaches:...
As a consequence of the massive utilization of Online Social Networks (OSNs) they must exploit a huge amount of hardware and network appliances. Therefore, optimizing their energy consumption could lead to major benefits both from the environmental and economical viewpoints. In this perspective, this paper defines a general OSN model based on homogenous aggregates of machineries concurring for a common...
Webserver farms and datacenters currently use workload consolidation to match the dynamic workload with the available resources since switching off unused machines has been shown to save energy. The workload is placed on the active servers until the servers are saturated. The idea of workload consolidation can be brought also to chip level by the OS scheduler to pack as much workload to as few cores...
Energy-efficient traffic engineering for wired network poses a number of difficulties due to equipment and protocols diversity and complexity. If emerging optimization are to be formulated exactly, they are intractable. This is why numerous heuristics for approximate solutions are proposed. They differ in assumptions on the routing scheme in the network, and also on the availability (and usefulness)...
The aim of this paper is to experimentally evaluate how the enabling of the TCP segmentation offload impacts on the energy consumption of a networked device. To this purpose, we set up a complete testbed that allowed us to perform measurements on energy on a state-of-the-art PC with power management capabilities, and the Linux operating system. From the results we observed that the decrease of the...
A network connected host generates/responds to routine applications and protocols heart-beat messages and is considered as disconnected when it fails to do this. Past studies have revealed that about 60–70% people leave their computers powered up 24/7 in the offices and at homes just to maintain the network connectivity. Huge amount of energy savings are possible if these computers can sleep during...
Energy efficiency is one of the main challenges to be faced by mobile communications in the near future. The growth of the mobile communications market which is boosted by the increasing penetration of smartphones and laptops requires an increase of the network capacity and, consequently, a great leap forward also for the infrastructures. In this scenario, in order to reduce the operative expenditures,...
The ICT (Information and Communication Technology) sector has recently been identified as a growing contributor to worldwide greenhouse gases emissions and power consumption. This has triggered interest for more energy efficient ways to design and operate telecommunication networks. We present an overview of the solutions proposed within the European network of excellence TREND focusing on core and...
Mobile devices, in particular smartphones, are battery powered. As their small size limits their energy capacity, an intelligent and energy-saving use of resources is crucial for the mobile user experience. Especially energy saving while sending and receiving data becomes important due to the always-on nature of smartphones. One solution for a sophisticated resource usage in wireless access networks...
In this paper we investigate the impact of caching content on Content Centric Networking (CCN) taking into account the energy efficiency of the caching strategy. We analyse the different threshold levels from which caching content starts to be beneficial based on two metrics, and take into consideration the used storage technologies and the location of the CCN router. Based on the presented analytical...
A simple model of service rate control system is presented that may be used to design energy-aware control rules for the processors capable of adjusting their operating capabilities to the observed workload. The model exploits a bi-objective processing performance index aggregating the cost of energy consumption and the cost of service delivery. An approximate solution to the related stochastic optimal...
The conventional power grid has several drawbacks and a new powerful Smart Grid perspective has been recently introduced. The Smart Grid principle, allowing to efficiently manage an electrical grid network, needs to exploit a communication network for interconnecting the Smart Grid devices. An increasing interest is toward wireless communications due to their higher flexibility. Within this context...
Reduction of energy consumption in the current Internet is one of the main challenges today. For this reason the target of this paper is to propose an analytical tool that allows router manufacturers to design a Governor with the aim of achieving the best trade-off between quality of service and energy saving in respect of a given target on the working temperature.
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