Sebastià Sallent

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The Wi-Fi technology, driven by its tremendous success, is expanding into a wide variety of devices and applications. However, many of these new devices, like handheld devices, pose new challenges in terms of QoS and energy efficiency. In order to address these challenges, in this paper we study how the novel MAC aggregation mechanisms developed in the(More)
The Wi-Fi technology is quickly being adopted by new types of devices that pose stringent requirements in terms of energy efficiency. In order to address these requirements the IEEE 802.11 group developed in the recent years several power saving protocols, that are today widely used among devices like smartphones. In this paper we study, by means of(More)
Even if Passive Optical Networks (PONs) have proven to be more energy-efficient that other access solutions, energy consumption minimization is becoming an important research target also in PON. In particular, to sustain the increased bandwidth demand of emerging applications in the access section of the network, new hybrid PON solutions employing WDM/TDM(More)
1389-1286/$ see front matter 2011 Elsevier B.V doi:10.1016/j.comnet.2011.06.012 ⇑ Corresponding author. E-mail addresses: camps@netlab.nec.de perez@netlab.nec.de (X. Pérez-Costa), seba (S. Sallent-Ribes). 1 In this paper we refer indistinctly to the set of from the work of the IEEE 802.11 group as Wi-Fi or Wi-Fi Direct is a new technology defined by the(More)
The current trend to incorporate the Wireless LAN technology in increasingly smaller mobile devices poses new challenges, in terms of QoS and power consumption requirements, for the design of such devices. IEEE 802.11 and 802.11e define mechanisms to address these challenges but do not provide any guidance about how to design the algorithms required to make(More)
We present an algorithm, <i>Shared-State Sampling (S<sup>3</sup>)</i>, for the problem of detecting large flows in high-speed networks. While devised with different principles in mind, <i>(S<sup>3</sup>)</i> turns out to be a generalization of two existing algorithms tackling the same problem: <i>Sample-and-Hold</i> and <i>Multistage Filters.(More)
We present two algorithms to the problem of identifying and measuring heavy-hitters. Our schemes report, with high probability, those flows that exceed a prescribed share of the traffic observed so far; along with an estimate of their sizes. One of the biggest advantages of our schemes is that they entirely rely on sampling. This makes them flexible and(More)
In October 2011 a new, ambitious project was launched, named FIBRE (Future Internet testbeds experimentation between Brazil and Europe). Its main goal is to create common space between Brazil and EU for Future Internet experimental research into network infrastructure and distributed applications, by building and operating a federated EU-Brazil Future(More)