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About

About

My name is Helder Fontes and I have a PhD degree in Informatics Engineering from University of Porto, Portugal, in 2019. I'm an Assistant Researcher at the Wireless Networks area, part of CTM, in which I have been part since 2009. Since then I have participated in national and EU research projects, including SITMe, Hiperwireless, FP7 SUNNY, SIMBED, SIMBED+ and ResponDrone. My PhD focused on Simulation-Experimentation Synergy. My research interests include wireless networking simulation, emulation, and experimentation in the scope of emerging scenarios such as airborne and maritime, with special focus on repeatability and reproducibility of experiments.

Interest
Topics
Details

Details

008
Publications

2021

Reproducible MIMO operation in ns-3 using trace-based wi-fi rate adaptation

Authors
Lamela, V; Fontes, H; Ruela, J; Ricardo, M; Campos, R;

Publication
ACM International Conference Proceeding Series

Abstract
Today, wireless networks are operating in increasingly complex environments, impacting the evaluation and validation of new networking solutions. Simulation, although fully controllable and easily reproducible, depends on simplified physical layer and channel models, which often produce optimistic results. Experimentation is also influenced by external random phenomena and limited testbed scale and availability, resulting in hardly repeatable and reproducible results. Previously, we have proposed the Trace-based Simulation (TS) approach to address the problem. TS uses traces of radio link quality and position of nodes to accurately reproduce past experiments in ns-3. Yet, in its current version, TS is not compatible with scenarios where Multiple-In-Multiple-Out (MIMO) is used. This is especially relevant since ns-3 assumes perfectly independent MIMO radio streams. In this paper, we introduce the Trace-based Wi-Fi Station Manager Model, which is capable of reproducing the Rate Adaptation of past Wi-Fi experiments, including the number of effective radio streams used. To validate the proposed model, the network throughput was measured in different experiments performed in the w-iLab.t testbed, considering Single-In-Single-Out (SISO) and MIMO operation using IEEE 802.11a/n/ac standards. The experimental results were then compared with the network throughput achieved using the improved TS and Pure Simulation (PS) approaches, validating the new proposed model and confirming its relevance to reproduce experiments previously executed in real environments. © 2021 ACM.

2021

Traffic-aware Gateway Placement for High-capacity Flying Networks

Authors
Coelho, A; Fontes, H; Campos, R; Ricardo, M;

Publication
2021 IEEE 93rd Vehicular Technology Conference (VTC2021-Spring)

Abstract

2020

On the Reproduction of Real Wireless Channel Occupancy in ns-3

Authors
Cruz, R; Fontes, H; Ruela, J; Ricardo, M; Campos, R;

Publication
CoRR

Abstract

2019

Improving ns-3 Emulation Performance for Fast Prototyping of Routing and SDN Protocols: Moving Data Plane Operations to Outside of ns-3

Authors
Fontes, H; Cardoso, T; Campos, R; Ricardo, M;

Publication
Simulation Modelling Practice and Theory

Abstract

2019

ns-3 NEXT: Towards a reference platform for offline and augmented wireless networking experimentation

Authors
Fontes, H; Lamela, V; Campos, R; Ricardo, M;

Publication
ACM International Conference Proceeding Series

Abstract
In the past years, INESC TEC has been working on using ns-3 to reduce the gap between Simulation and Experimentation. Two major contributions resulted from our work: 1) the Fast Prototyping development process, where the same ns-3 protocol model is used in a real experiment; 2) the Trace-based Simulation (TS) approach, where traces of radio link qualities and position of nodes from past experiments are injected into ns-3 to achieve repeatable and reproducible experiments. In this paper we present ns-3 NEXT, our vision for ns-3 to enable simulation and experimentation using the same platform. We envision ns-3 as the platform that can automatically learn from past experiments and improve its accuracy to a point where simulated resources can seamlessly replace real resources. At that point, ns-3 can either replace a real testbed accurately (Offline Experimentation) or add functionality and scale to testbeds (Augmented Experimentation). Towards this vision, we discuss the current limitations and propose a plan to overcome them collectively within the ns-3 community. © 2019 ACM.

Supervised
thesis

2020

Multi-technology Flying Access Network for Disaster Management Scenarios

Author
Rúben Miguel Rei Queirós

Institution
INESCTEC

2020

Trace-based ns3-gym Reinforcement Learning Environment Framework for Wireless Networks

Author
Gonçalo Regueiras dos Santos

Institution
UP-FEUP

2020

An SDN-based Predictive Orchestrator for Transparent Multi-interface Vehicular Internet Access

Author
Agostinho Filipe de Almeida Coimbra Maia

Institution
UP-FEUP