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Mécanismes d'optimisation de l'utilisation des technologies dans le Home Network

Hanane El Abdellaouy 1, 2
1 OCIF - Objets communicants pour l'Internet du futur
Abstract : The recent improvements in communication technologies and products in terms of services' diversification have a direct effect on home environment. Nowadays, homes host increasingly sophisticated devices providing a wide range of services such as HDTV, VoIP, multimedia storage, gaming, music and so on. This extension does not come for free. Indeed, Information and Communication Technology-enabled (ICT) devices consume about the quarter of the total power consumption within a typical home network, which puts forward the issue of energy e_ciency in the home network. In addition, electromagnetic radiation emissions are increasing within homes and may create fear likely to slow down future innovations for certain community of people. Nevertheless the increasing connectivity may help to solve these problems by disabling redundant devices or select more appropriate paths in the network. The problem can be viewed as a multi-criteria routing protocol generalization with the introduction of new metrics. A home network routing solution has therefore to support additional constraints in conjunction with QoS criteria. It has been a challenging goal to make path selection based on ecological criteria that are closely linked to the external environment (e.g. EM radiation); instead of the conventional routing metrics inherently dependent on network state (e.g. delay). In this thesis, we develop a new concept of radiation-aware routing algorithm for heterogeneous home networks in order to reduce radiated emissions level within a given area. The first contribution is the proposal of two models of electromagnetic radiated emissions stemming from Wi-Fi and PLC links based on a set of assumptions and mathematical approximation methods. We have then formulated a link-adaptive radiation-aware routing metric. The second contribution is the proposal of the Radiant Exposure (RE), which is a new routing metric for finding minimum radiated emissions paths in multi-hop heterogeneous network. The RE of a path is the expected radiated energy in units of W.s/m^2, within the radiation-sensitive area, while transmitting a packet along that path. The RE metric incorporates the effects of the distance between the radiating sources and the radiation-sensitive area as well as the asymmetry of this radiated energy regarding the two directions of each link. We describe the design and implementation of RE as routing metric that can _t any shortest path algorithm. For practical networks, using RE metric also maximizes the network throughput. We show by simulations that using RE metric reduces significantly radiated energy compared to the widely used minimum-hop count metric. The third contribution consists of proposing a mutli-criteria routing algorithm built upon the well-known normalized weighting function. Such method transforms a multi-objective problem into a mono-objective problem by multiplying each objective function by a weighting factor and summing up all the weighted criteria. We involve the user in the process of selecting weights in line with their preferences. The three criteria considered here are radiant exposure (RE), expected energy consumption and bandwidth.
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Submitted on : Wednesday, October 7, 2015 - 1:13:41 PM
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Hanane El Abdellaouy. Mécanismes d'optimisation de l'utilisation des technologies dans le Home Network. Computer science. Télécom Bretagne; Université de Rennes 1, 2015. English. ⟨tel-01212832⟩



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