A5057922919- Opportunistic and Delay-Tolerant Networks
- Mobile Ad Hoc Networks
- Caching and Content Delivery
- Vehicular Ad Hoc Networks (VANETs)
- Energy Efficient Wireless Sensor Networks
- Smart Grid Security and Resilience
- Energy Harvesting in Wireless Networks
- Network Traffic and Congestion Control
- Mobile Agent-Based Network Management
- Network Time Synchronization Technologies
- Security in Wireless Sensor Networks
- Service-Oriented Architecture and Web Services
- Software-Defined Networks and 5G
- Advanced Optical Network Technologies
- Age of Information Optimization
- Business Process Modeling and Analysis
- Power Systems and Technologies
- Power Systems Fault Detection
- Atmospheric aerosols and clouds
- IoT-based Smart Home Systems
- Image and Video Quality Assessment
- Electromagnetic Compatibility and Noise Suppression
- Flexible and Reconfigurable Manufacturing Systems
- IoT Networks and Protocols
- Multimedia Communication and Technology
Instituto de Engenharia de Sistemas e Computadores Investigação e Desenvolvimento
2013-2025
University of Lisbon
2009-2025
Instituto de Novas Tecnologias
2017-2018
Lusíada University of Lisbon
2017
Instituto Politécnico de Lisboa
2011-2015
Instituto Superior Técnico
2011
University of Beira Interior
2011
This paper provides an introductory overview of Vehicular Delay-Tolerant Networks. First, introduction to Networks and is given. schemes protocols can help in situations where network connectivity sparse or with large variations density, even when there no end-to-end by providing a communications solution for non real-time applications. Some special issues like routing are addressed the description applications most important projects Finally, some research challenges discussed conclusions detailed.
The Internet of Vehicles (IoV) is undoubtedly at the core future intelligent transportation. It will prevail over road ecosystem, and it have a huge impact on our lives throughout provision seamless connectivity among diverse transportation means. For network to operate efficiently, data needs be quickly spread network, which requires low computational bandwidth overheads. However, dynamics vehicular environments due frequent node mobility poses many challenges realize efficient...
This paper presents the characterization of network delays in an IEC61850 process bus substation area network, both through theoretical analysis and simulations. Several design targets were defined considering recommendations standards good practices: number hops, total delay, probability delay being exceeded, link load, topology availability. An analytical estimation methodology is proposed, steady-state traffic resulting from a breaker failure event. A complete taken as example for...
Delay Tolerant Networks (DTNs) are sparse networks where complete direct end-to-end paths between source and destination can seldom be established. Routing mechanisms in DTN rely on the nodes' mobility to connect disconnected nodes, carrying messages around network overcome path disconnection. The proactive approach consists of introducing dedicated nodes whose only purpose is establish communication ordinary relieve them from energy-consuming work, such as message routing forwarding. This...
This paper proposes an enhanced PRIvacy preserVing opportunistic routing protocol (ePRIVO) for vehicular delay-tolerant networks (VDTN). ePRIVO models a VDTN as time-varying neighboring graph where edges correspond to relationship between pairs of vehicles. It addresses the problem vehicles taking decision meanwhile keeping their information private, i.e., compute similarity and/or compare metrics in private manner using Paillier homomorphic encryption scheme. The effectiveness is supported...
This paper introduces PRIVO, a PRIvacy-preserVing Opportunistic routing protocol for Delay Tolerant Networks. PRIVO models DTN as time-varying neighboring graph where edges correspond to the relationship among pairs of nodes. ensures privacy by protecting each node's sensitive information even if it has be processed elsewhere. In addition, nodes also compare their metrics in private manner using Paillier homomorphic encryption scheme. The effectiveness is supported through extensive...
In this article, a robust and distributed incentive scheme for collaborative caching dissemination in content-centric cellular-based vehicular delay-tolerant networks (REPSYS) is proposed. REPSYS because despite taking into account first- second-hand information, it resilient against false accusations praise, distributed, as the decision to interact with another node depends entirely on each node. The performance evaluation shows that capable, while evaluating node's participation network,...
Vehicular Delay-Tolerant Networks use the delay-tolerant architecture and protocols to overcome disruptions in network connectivity. These concepts help cases where is sparse or with large variations density there no end-to-end connectivity, by providing a communications solution for non real-time applications. This paper presents data fragmentation techniques optimize efficiency of delivery case short node contacts that characterize vehicle networks. The were tested laboratory environment...
Disruptions, high dynamism and no end-to-end communication are some of the Vehicular Delay-Tolerant Networks (VDTNs) main characteristics. This paper describes implementation a new VDTN multicast routing protocol which makes use knowledge about previous encounters to estimate congestion density better spread data bundles limit number copies reduce overhead. After brief introduction Networks, VDTNs, protocols, protocol, named NewVDTN, is described. It will be compared against Epidemic...
This paper presents an overview of a Wireless Sensor and Actuator Network (WSAN) used to monitor electrical power grid distribution infrastructure. The WSAN employs appropriate sensors key components, integrating both safety security services, which improve the dependability. supported applications include, among others, video surveillance remote secondary substations, imposes special requirements from point view quality service reliability. hardware software architecture system together...
In this paper, an implementation of a transport protocol to be used in Wireless Multimedia Sensor Networks (WMSNs) is presented. The objective the guarantee reliability by recovering lost packets while dealing with limited energy, processing and memory capabilities devices typically these networks. implemented was Distributed Transport for (DTSN) target device embedded Silex SX-560 using WiFi technology. done C language under Linux operating system. Following requirements project, additional...
Abstract Vehicular Delay-Tolerant Networks (VDTNs) are a new approach for vehicular communications where vehicles cooperate with each other, acting as the communication infrastructure, to provide low-cost asynchronous opportunistic communications. These technologies assume variable delays and bandwidth constraints characterized by non-transmission control protocol/internet protocol architecture but interacting it at edge of network. VDTNs based on principle communications, bundle-oriented...
Distributed reputation systems can be used to foster cooperation between nodes in decentralized and self-managed due the nonexistence of a central entity. In this paper, Robust Reputation System for Delay-Tolerant Networks (REPSYS) is proposed. REPSYS robust because despite taking into account first- second-hand information, it resilient against false accusations praise, distributed, as decision interact with another node depends entirely on each node. Simulation results show that system...
This paper presents the study and implementation of a reliable transport protocol for wireless multimedia sensor networks. The work was based on an existing networks, DTSN ("distributed networks") developed at Inesc within projects IST FP6 UbiSec&Sens, EuroFGI FP7 EuroNF. For data transport, some structural changes were made to DTSN, mechanisms added in order provide differentiated reliability service packets flowing network. new allows stream be divided several blocks with different...
The Vehicular Delay-Tolerant Networks (VTDN) project proposed a novel architecture for VDTN. Besides positioning the bundle layer below network layer, it employs out-of-band signaling and devises separation of control plane data plane. A laboratory prototype was created to demonstrate this approach. also developed new applications, fragmentation mechanisms, content storage retrieval dropping scheduling policies, routing protocols VDTNs.
Vehicular Delay-Tolerant Networks (VDTNs) are composed of mobile nodes that communicate wirelessly with each other to forward data despite connectivity issues. This paper focuses on the problem some trying impair communication a VDTN. In we study case delay forwarding messages is particularly difficult detect form misbehavior. We impact this misbehavior eight VDTN routing protocols using large set simulations and two scenarios. The results show depending type misbehavior, message replication...