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The Internet comprises access segments with wired and wireless technologies. In\ud the future, we can expect wireless mesh infrastructures (WMIs) to proliferate in this\ud context. Due to the relatively low energy efficiency of wireless transmission, as\ud compared to wired transmission, energy consumption of WMIs can represent a significant\ud part of the energy consumption of the Internet as a whole. We explore different\ud approaches to reduce energy consumption in WMIs, taking into account the\ud heterogeneity of the technologies and the interaction with wired networks. Finally,\ud we present an example scenario where the application of these methods is discussed.Postprint (published version

This article presents a new version of the Dynamic Source Routing (DSR) protocol that favours the selection of a route containing nodes with high battery levels, in order to maximize the lifetime of the ad hoc mobile network as a whole. This proposal implies little modifications to the original algorithm. After a quantitative analysis, we see simulation results that indicate that the proposed scheme, SEADSR (Simple Energy Aware DSR), outperforms the standard DSR in terms of network survivability and network capacity. GLOBECOM 2003 -718 -0-7803-7974-8/03/$17.00

In this paper, we present new adaptive importance sampling techniques based on stochastic Newton recursions. Their applicability to the performance evaluation of communication systems is studied. Besides bit-error rate (BER) estimation, the techniques are used for system parameter optimization. Two system models that are analytically tractable are employed to demonstrate the validity of the techniques. As an application to situations that are analytically intractable and numerically intensive, the influence of crosstalk in a wavelength-division multiplexing (WDM) crossconnect is assessed. In order to consider a realistic system model, optimal setting of thresholds in the detector is carried out while estimating error rate performances. Resulting BER estimates indicate that the tolerable crosstalk levels are significantly higher than predicted in the literature. This finding has a strong impact on the design of WDM networks. Power penalties induced by the addition of channels can also be accurately predicted in short run-times.

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