183 research outputs found

    Diseño y desarrollo de una plataforma de comunicaciones descentralizada con WiFi Direct y protocolos M2M

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    El aumento del número de dispositivos IoT existentes hoy en día plantea enormes desafíos en los sistemas de comunicaciones. Para satisfacer las crecientes necesidades de los usuarios y utilizar eficientemente los escasos recursos disponibles, la comunicación Device-To-Device (D2D) se considera una importante tecnología emergente para el futuro de las redes. En este trabajo se propone un algoritmo de consenso anticipado y recurrente para la elección del mejor punto de acceso en caso de caída del nodo principal, cambios en la red e itinerancia. Se presenta el diseño y desarrollo de una plataforma de comunicaciones descentralizada que permita una comunicación eficiente y segura entre dispositivos sin necesidad de un concentrador o enrutador central, utilizando la tecnología WiFi Direct. Para este fin, se discuten las limitaciones actuales de los sistemas de comunicación centralizados tradicionales y los beneficios de los sistemas descentralizados, haciendo especial énfasis en los algoritmos de consenso. Más adelante, la investigación se centra en el diseño y la implementación de la plataforma propuesta, incluido el uso de WiFi Direct para el descubrimiento y la conexión de dispositivos, utilizando protocolos Machine-to-Machine (M2M) para una transferencia de datos eficiente, y se trata de solventar las limitaciones encontradas. Cabe destacar el uso de diferentes herramientas de simulación como WiDiSi o MQTTX para la obtención de unos resultados que nos hagan reafirmar las hipótesis planteadas a lo largo de esta investigación. Por último, analizando los resultados, dado que la mayoría de los estudios se basan en la aleatoriedad para la selección del líder, se propone el diseño de un algoritmo de consenso basado en el algoritmo Raft que permita establecer criterios más útiles para conseguir una mejora de calidad en torno a la elección, en el contexto de WiFi Direct finalizando con la presentación de los resultados que muestran como la flexibilidad inherente del algoritmo proporciona una solución adaptable a diversas aplicaciones y escenarios en sistemas distribuidos abriendo nuevas posibilidades para investigaciones futuras y desarrollos en el campo de las redes distribuidas.The increase in the number of existing IoT devices today poses enormous challenges in communication systems. To meet the growing needs of users and efficiently use scarce resources, Device-To-Device (D2D) communication is considered an important emerging technology for the future of networks. In this work, an advanced and recurring consensus algorithm is proposed for selecting the best access point in case of main node failure, network changes, and roaming. The design and development of a decentralized communication platform is presented, enabling efficient and secure communication between devices without the need for a central hub or router, using WiFi Direct technology. To this end, the current limitations of traditional centralized communication systems are discussed, along with the benefits of decentralized systems, with a special emphasis on consensus algorithms. Subsequently, the research focuses on the design and implementation of the proposed platform, including the use of WiFi Direct for device discovery and connection, using Machineto- Machine (M2M) protocols for efficient data transfer, and addressing the encountered limitations. It is worth noting the application of different simulation tools such as WiDiSi or MQTTX to obtain preliminary results that support the hypotheses raised throughout this research. Finally, considering the results, given that the majority of studies rely on randomness for leader selection, the design of a consensus algorithm based on Raft algorithm is proposed in the context of WiFi Direct in order to establish more useful criteria for achieving an improvement in quality regarding the selection. This culminates in the presentation of results demonstrating how the inherent flexibility of the algorithm provides an adaptable solution for various applications and scenarios in distributed systems, thereby opening up new possibilities for future research and developments in the field of distributed networks.Universidad de Sevilla. Grado en Ingeniería de las Tecnologías de Telecomunicació

    Experimental Study on Real-Time Wireless Networks for Motion Control of Manipulator and Mobile Platform in Industrial Robotics

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    The integration of ICT with manufacturing technologies is a key step towards intelligent manufacturing. The goal is to investigate some industrial application scenarios and evaluate the performance of selected wireless technologies. A recently standardized industrial wireless technology, WIA-FA, has shown good performance in practical deployments. Two experimental applications are considered: path planning testing with different wireless technologies and CANbus bridging with WIA-FA.openEmbargo temporaneo per motivi di segretezza e/o di proprietà dei risultati e informazioni di enti esterni o aziende private che hanno partecipato alla realizzazione del lavoro di ricerca relativo alla tes

    Análise da utilização do 5G em aplicações de redes elétricas inteligentes

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    The Brazilian electrical system has particular characteristics that demand very specific operational requirements and Smart Grids applications. One example is the fact of the system is mostly interconnected, with a large territorial extension and with most of the electric generation being of hydraulic origin, what is a situation that allows the inclusion of water resource monitoring as an Smart Grids application. In addition, other applications are present, such as remote metering, energy management, automation, demand response, vehicular electrification, distributed generation and control of protection systems. One factor that makes these applications viable is the use of communication technologies, which must meet specific requirements for each kind of application. Therefore, a wide range of technologies need to be analyzed carefully and technically for each case, such as WiMAX, NB-IoT, LoRa, Sigfox, Bluetooth, Zigbee, GOES, Wi-Fi, Ingenu, 6LoWPAN, DASH7 and cellular technologies. In this scenario, the telecommunications system in Brazil is constantly being updated and is being prepared to receive the 5G cellular network, which has been analyzed in all the aforementioned applications and is shown to be viable in most of them. In addi tion, 5G has been widely studied, being one of the most cited wireless communication technologies in scientific publications related to Smart Grids. This scenario shows a great interest of the scientific community of 5G in Smart Grids context.O sistema elétrico brasileiro possui características particulares que demandam requisitos operacionais e aplicações de redes elétricas inteligentes bastante específicas. Pode-se citar, por exemplo, o fato de o sistema ser majoritariamente interligado, com grande extensão territorial e com a maior parte da geração elétrica sendo de origem hidráulica, situação que permite a inclusão de monitoramento de recurso hídrico como uma aplicação de redes elétricas inteligentes. Além disso, outras aplicações estão presentes, tais como medição remota, gerenciamento de energia, automação, resposta de demanda, eletrificação veicular, geração distribuída e controle de sistemas de proteção. Um fator que viabiliza estas aplicações é o uso de tecnologias de comunicação, as quais devem atender requisitos específicos para cada uma delas. Sendo assim, uma vasta gama de tecnologias precisam ser analisadas criteriosamente e tecnicamente para cada caso, como por exemplo WiMAX, NB-IoT, LoRa, Sigfox, Bluetooth, Zigbee, GOES, Wi-Fi, Ingenu, 6LoWPAN, DASH7 e as diversas tecnologias celulares. Neste cenário, o sistema de telecomunicações no Brasil está em constante atualização e se prepara para a chegada da rede móvel 5G, o qual foi analisado em todas as aplicações citadas e se mostra viável na maioria delas. Além disso, o 5G vem sendo amplamente estudado, sendo uma das tecnologias de comunicação sem fio mais citadas em publicações científicas relacionadas às redes elétricas inteligentes

    Contributions to Context-Aware Smart Healthcare: A Security and Privacy Perspective

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    Les tecnologies de la informació i la comunicació han canviat les nostres vides de manera irreversible. La indústria sanitària, una de les indústries més grans i de major creixement, està dedicant molts esforços per adoptar les últimes tecnologies en la pràctica mèdica diària. Per tant, no és sorprenent que els paradigmes sanitaris estiguin en constant evolució cercant serveis més eficients, eficaços i sostenibles. En aquest context, el potencial de la computació ubiqua mitjançant telèfons intel·ligents, rellotges intel·ligents i altres dispositius IoT ha esdevingut fonamental per recopilar grans volums de dades, especialment relacionats amb l'estat de salut i la ubicació de les persones. Les millores en les capacitats de detecció juntament amb l'aparició de xarxes de telecomunicacions d'alta velocitat han facilitat la implementació d'entorns sensibles al context, com les cases i les ciutats intel·ligents, capaços d'adaptar-se a les necessitats dels ciutadans. La interacció entre la computació ubiqua i els entorns sensibles al context va obrir la porta al paradigma de la salut intel·ligent, centrat en la prestació de serveis de salut personalitzats i de valor afegit mitjançant l'explotació de grans quantitats de dades sanitàries, de mobilitat i contextuals. No obstant, la gestió de dades sanitàries, des de la seva recollida fins a la seva anàlisi, planteja una sèrie de problemes desafiants a causa del seu caràcter altament confidencial. Aquesta tesi té per objectiu abordar diversos reptes de seguretat i privadesa dins del paradigma de la salut intel·ligent. Els resultats d'aquesta tesi pretenen ajudar a la comunitat científica a millorar la seguretat dels entorns intel·ligents del futur, així com la privadesa dels ciutadans respecte a les seves dades personals i sanitàries.Las tecnologías de la información y la comunicación han cambiado nuestras vidas de forma irreversible. La industria sanitaria, una de las industrias más grandes y de mayor crecimiento, está dedicando muchos esfuerzos por adoptar las últimas tecnologías en la práctica médica diaria. Por tanto, no es sorprendente que los paradigmas sanitarios estén en constante evolución en busca de servicios más eficientes, eficaces y sostenibles. En este contexto, el potencial de la computación ubicua mediante teléfonos inteligentes, relojes inteligentes, dispositivos wearables y otros dispositivos IoT ha sido fundamental para recopilar grandes volúmenes de datos, especialmente relacionados con el estado de salud y la localización de las personas. Las mejoras en las capacidades de detección junto con la aparición de redes de telecomunicaciones de alta velocidad han facilitado la implementación de entornos sensibles al contexto, como las casas y las ciudades inteligentes, capaces de adaptarse a las necesidades de los ciudadanos. La interacción entre la computación ubicua y los entornos sensibles al contexto abrió la puerta al paradigma de la salud inteligente, centrado en la prestación de servicios de salud personalizados y de valor añadido mediante la explotación significativa de grandes cantidades de datos sanitarios, de movilidad y contextuales. No obstante, la gestión de datos sanitarios, desde su recogida hasta su análisis, plantea una serie de cuestiones desafiantes debido a su naturaleza altamente confidencial. Esta tesis tiene por objetivo abordar varios retos de seguridad y privacidad dentro del paradigma de la salud inteligente. Los resultados de esta tesis pretenden ayudar a la comunidad científica a mejorar la seguridad de los entornos inteligentes del futuro, así como la privacidad de los ciudadanos con respecto a sus datos personales y sanitarios.Information and communication technologies have irreversibly changed our lives. The healthcare industry, one of the world’s largest and fastest-growing industries, is dedicating many efforts in adopting the latest technologies into daily medical practice. It is not therefore surprising that healthcare paradigms are constantly evolving seeking for more efficient, effective and sustainable services. In this context, the potential of ubiquitous computing through smartphones, smartwatches, wearables and IoT devices has become fundamental to collect large volumes of data, including people's health status and people’s location. The enhanced sensing capabilities together with the emergence of high-speed telecommunication networks have facilitated the implementation of context-aware environments, such as smart homes and smart cities, able to adapt themselves to the citizens needs. The interplay between ubiquitous computing and context-aware environments opened the door to the so-called smart health paradigm, focused on the provision of added-value personalised health services by meaningfully exploiting vast amounts of health, mobility and contextual data. However, the management of health data, from their gathering to their analysis, arises a number of challenging issues due to their highly confidential nature. In particular, this dissertation addresses several security and privacy challenges within the smart health paradigm. The results of this dissertation are intended to help the research community to enhance the security of the intelligent environments of the future as well as the privacy of the citizens regarding their personal and health data

    PSM-DMO: power save mode and discontinuous BLE mesh operation

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    The Bluetooth Low Energy (BLE) mesh profile, standardized by the Bluetooth Special Interest Group (SIG), has an increasing interest in IoT solutions. However, the standard assumes that relay and friend nodes should be continuously scanning the channel awaiting any incoming transmissions. This could be very inefficient in terms of energy consumption, particularly in application scenarios where the backbone of the mesh network cannot be powered and traffic is infrequent. Hence, we present a novel strategy, named PSM-DMO, that minimizes the scan periods and thus, significantly reduces the overall energy consumption of the mesh network. PSM-DMO is defined as a new and optional feature for the currently published BLE mesh specifications, coexists with the standard operation, and is implemented without modifying the core of the specification. The proposal, that ensures the reliability of the mesh operation, can be used in BLE sensor networks that can tolerate a certain transmission delay. PSM-DMO replaces the continuous scan by a periodic but asynchronous polling process whereby the relay and sink nodes interrogate their neighbors about the existence of data to receive or to retransmit through the network. Nodes only go into scan mode during the period of time the mesh network will be involved in the transmission and dissemination. This period is estimated by the node which is the source of data, it is announced to its neighbors and it is propagated consecutively by all the relay nodes until the destination. PSM-DMO allows a theoretical reduction in the energy consumption of relay nodes up to 99.24 %.This work has been supported in part by the Spanish Ministry of Science through the projects RTI2018-099880-B-C32. RTI2018-095684-B-I00 and RTI2018-099063-B-I00 with ERFD funds, and by the Government of Aragon (Reference Group T31_20R).Peer ReviewedPostprint (published version

    PSM-DMO: power save mode and discontinuous BLE mesh operation

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    The Bluetooth Low Energy (BLE) mesh profile, standardized by the Bluetooth Special Interest Group (SIG), has an increasing interest in IoT solutions. However, the standard assumes that relay and friend nodes should be continuously scanning the channel awaiting any incoming transmissions. This could be very inefficient in terms of energy consumption, particularly in application scenarios where the backbone of the mesh network cannot be powered and traffic is infrequent. Hence, we present a novel strategy, named PSM-DMO, that minimizes the scan periods and thus, significantly reduces the overall energy consumption of the mesh network. PSM-DMO is defined as a new and optional feature for the currently published BLE mesh specifications, coexists with the standard operation, and is implemented without modifying the core of the specification. The proposal, that ensures the reliability of the mesh operation, can be used in BLE sensor networks that can tolerate a certain transmission delay. PSM-DMO replaces the continuous scan by a periodic but asynchronous polling process whereby the relay and sink nodes interrogate their neighbors about the existence of data to receive or to retransmit through the network. Nodes only go into scan mode during the period of time the mesh network will be involved in the transmission and dissemination. This period is estimated by the node which is the source of data, it is announced to its neighbors and it is propagated consecutively by all the relay nodes until the destination. PSM-DMO allows a theoretical reduction in the energy consumption of relay nodes up to 99.24 %

    Mobile Ad-Hoc Networks

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    Being infrastructure-less and without central administration control, wireless ad-hoc networking is playing a more and more important role in extending the coverage of traditional wireless infrastructure (cellular networks, wireless LAN, etc). This book includes state-of-the-art techniques and solutions for wireless ad-hoc networks. It focuses on the following topics in ad-hoc networks: quality-of-service and video communication, routing protocol and cross-layer design. A few interesting problems about security and delay-tolerant networks are also discussed. This book is targeted to provide network engineers and researchers with design guidelines for large scale wireless ad hoc networks

    Advanced Trends in Wireless Communications

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    Physical limitations on wireless communication channels impose huge challenges to reliable communication. Bandwidth limitations, propagation loss, noise and interference make the wireless channel a narrow pipe that does not readily accommodate rapid flow of data. Thus, researches aim to design systems that are suitable to operate in such channels, in order to have high performance quality of service. Also, the mobility of the communication systems requires further investigations to reduce the complexity and the power consumption of the receiver. This book aims to provide highlights of the current research in the field of wireless communications. The subjects discussed are very valuable to communication researchers rather than researchers in the wireless related areas. The book chapters cover a wide range of wireless communication topics

    The Machine that Lives Forever

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    Design an intelligent micromachine that can self-power and sustain from environmental energy scavenging to achieve an autonomous device that can communicate at will with peers indefinitely. Explore sleep/wake hibernation strategies coupled with food scavenging off-grid traits to identify the tightest work to sleep efficiency schedule, incorporating adaptive reconfiguration to manage significant environmental impacts. Capture, store and manage background radiations and stray RF signals to feed on in a continued effort to make intelligent survival decisions and oversee management protocols. Ensure that every micro Watt of usable energy gets extracted from every part of the harvest and then forward-scheduled it for productive use. Finally, employ natures tricks and experience to introduce essential personality traits, pursuing maximising survival numbers and increasing dispersal target area sizes of large self-sufficient wireless sensor deployments. This research intends to provide a closely coupled software-hardware foundation that aids implementers in intelligently harnessing and using tiny amounts of ambient energy in a highly autonomous way. This platform then continues on to explore ways of maximising the efficient usage of the harvested energy using various hibernation/wake strategies and then making objective comparisons with proposed intelligent energy management protocols. Finally, the protocol extends to enable the device to manage its personal survival possibilities so the devices can use an evolutional personality-based approach to deal with the unknown environmental situations they will encounter. This work examines a machine that can self-power and sustain from environmental energy scavenging with the aim to live forever. Living forever implies a brain (microcontroller) that can manage energy and budget for continuous faculty. With these objectives, sleep/wake/hibernation and scavenging strategies are examined to efficiently schedule resources within a transient environment. Example harvesting includes induced and background radiation. Intelligent, biologically-inspired strategies are adopted in forward-scheduling strategies given temporal energy relative to the machine’s function (the Walton)

    Aerial Vehicles

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    This book contains 35 chapters written by experts in developing techniques for making aerial vehicles more intelligent, more reliable, more flexible in use, and safer in operation.It will also serve as an inspiration for further improvement of the design and application of aeral vehicles. The advanced techniques and research described here may also be applicable to other high-tech areas such as robotics, avionics, vetronics, and space
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