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Sobre

Sobre

O meu nome é Helder Fontes e obtive o grau de Doutor em Engenharia Informática, pela Universidade do Porto, Portugal, em 2019. Sou Investigador Auxiliar na área de Redes sem Fios, parte do CTM, na qual estou integrado desde 2009. Desde essa altura já participei em projetos nacionais e europeus, incluindo o SITMe, Hiperwireless, FP7 SUNNY, SIMBED, SIMBED+ e ResponDrone. O meu doutoramento focou-se na Sinergia Simulação-Experimentação. Os meus interesses de investigação incluem simulação, emulação, e experimentação de redes sem fios no contexto de cenários emergentes como os aérios e marítimos, com especial foco em repetibilidade e reproducibilidade de experiências.

Tópicos
de interesse
Detalhes

Detalhes

008
Publicações

2021

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

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

Publicação
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

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

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

Abstract

2020

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

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

Publicação
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

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

Publicação
Simulation Modelling Practice and Theory

Abstract

2019

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

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

Publicação
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.

Teses
supervisionadas

2020

Multi-technology Flying Access Network for Disaster Management Scenarios

Autor
Rúben Miguel Rei Queirós

Instituição
INESCTEC

2020

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

Autor
Gonçalo Regueiras dos Santos

Instituição
UP-FEUP

2020

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

Autor
Agostinho Filipe de Almeida Coimbra Maia

Instituição
UP-FEUP