Alaeddine El Fawal

Biography

In June 2010, Alaeddine El Fawal joined EPFL Middle East, where he is the Director of the IT Department and of Strategic ICT Development. In February 2013, he was elected as an executive committee member for the UAE Higher Education CIO Council. Previously, he was a senior researcher at EPFL (Ecole Polytechnique Fédérale de Lausanne) in Switzerland. He earned his PhD in communication systems in July 2009 from EPFL, where he worked with Prof. Jean-Yves Le Boudec. He received his M.A.S. in networking in 2002 and his MSc degree in Telecommunications in 2001, both from the Lebanese University. He carried out his M.A.S. thesis in the Planète team, INRIA, Sophia Antipolis France, and the master thesis at LCST (Laboratoire des Composants et des Systèmes de Télécommunications), INSA, Rennes France.

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https://people.epfl.ch/alaeddine.elfawal

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Empirical Performance Evaluation of Data Dissemination Mechanisms for Spot Applications

Adel Aziz, Alaeddine El Fawal, Jean-Yves Le Boudec

We evaluate, by measurements on a real testbed, the performance of networking services required for spot applications. We call a “spot application” an application for smartphones (such as “Ad-hoc Flash Sales”) that disseminates information in a local neighborhood through hop-by-hop wireless forwarding. The dissemination environment is challenging. It is open-ended, and highly dynamic with very limiting resource constraints. We define five success criteria that are required by a spot application to ensure a sustainable dissemination. They cover issues such as adaptability, resource conserving and co-existence with TCP applications. We evaluate a package of mechanisms and we identify how those, through their interaction, can altogether meet these criteria. This package includes flow control, forwarding factor control and buffer management. Our measurements are carried out on a realistic testbed composed of 50 wireless devices. Our metrics include spread, application rate, forwarding factor and delay. Some findings are: blind mechanisms can interact among each other to meet the success criteria; aging entails intolerable processing complexity for smartphones; and TTL-based buffer management performs poorly with large buffer size.

2012

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HomePlug AV (HPAV) was designed to provide high speed in-home communication with 200Mbps PHY rate, with the goal to overcome various noises over power wires and to jump from one phase to a neighboring one. A HomePlug AV Logical Networks (AVLN) is defined by cryptographic means, i.e. stations that share the same key and hear each other are in the same AVLN; however, AVLNs which coexist in a neighborhood cannot communicate but share the same physical layer. These points imply that people using HomePlug AV may share system throughput with neighbors without being aware of it. In order to assess the reality of this potential problem, we performed measurements on an experimental testbed with several AVLNs and equipment from different manufacturers. Our results are: 1. we verified that HomePlug AV stations can communicate even over physically separated wires, and thus neighboring stations in the same AVLN or in different AVLNs may share the same throughput; 2. when stations are placed in two different AVLNs, system performance is noticeably less compared to having the same stations at the same locations but in one single AVLN; 3. HPAV stations from different manufacturers do interoperate but experience heavy per-pair throughput outages. Our findings suggest that HPAV does not perform satisfactorily in large deployments. A possible solution to the problem would be to make different AVLNs quasi-orthogonal at the physical layer, perhaps using the cryptographic key to seed an OFDM hopping sequence.

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2011

Aziala-net: Deploying a Scalable Multi-hop Wireless Testbed Platform for Research Purposes

Adel Aziz, Alaeddine El Fawal, Jean-Yves Le Boudec, Patrick Thiran

Aziala-net is a flexible and scalable experimental testbed for wireless multi-hop networks based on simple off-the-shelf hardware that is able to adapt to various research purposes. It is composed of more than 50 Asus wireless routers that have been adapted to either work as fixed base station or as mobile nodes. After describing the technical details of Aziala-net, we illustrate the potential of the testbed by showing two samples of works that are currently under study in the testbed. The first example focus on the use of the IEEE 802.11 MAC layer protocol for multi-hop networks and the stability problem that it faces in the case of wireless mesh networks. The second example focus on epidemic forwarding protocols and their performance in a real testbed deployment.

2009