Noélia Correia

Noélia Correia
Universidade do Algarve | UALG · Centro de Electrónica, Optoelectronica e Telecomunicações (CEOT)

PhD

About

102
Publications
12,311
Reads
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557
Citations
Citations since 2017
49 Research Items
393 Citations
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Introduction
Noélia Correia currently works at the Centro de Electrónica, Optoelectronica e Telecomunicações (CEOT), Universidade do Algarve. Noélia does research in Algorithms, Computer Communications (Networks) and Communication Engineering. Their current project is 'CEOT Web of Things'.
Additional affiliations
March 2005 - present
Universidade do Algarve
January 2000 - March 2005
University College London
Position
  • PhD Student (co-supervisied by Prof. John O'Reilly)
January 1998 - present
Universidade do Algarve
Position
  • Professor (Assistant)

Publications

Publications (102)
Chapter
LoRaWAN-based wide area monitoring systems may use non-stationary LoRaWAN gateway devices to collect sensor data. In these cases, the most suitable locations for gateways must be found, while taking into account the scarcity of radio resources and energy consumption. In this paper an optimization model is proposed that aims to address this problem....
Article
Event processing is the cornerstone of the dynamic and responsive Internet of Things (IoT). Recent approaches in this area are based on representational state transfer (REST) principles, which allow event processing tasks to be placed at any device that follows the same principles. However, the tasks should be properly distributed among edge device...
Article
Smart radio environment (SRE) via reconfigurable and intelligent reflecting surfaces (IRSs) is envisioned to shape wireless communication beyond 5G. In SRE, low-cost, low-power, and passive IRS elements will, in an intelligent manner, alter the phase shifts of incident waves to beamform the reflected signal in the desired direction. SRE challenges...
Chapter
The Internet of things has grown in recent years, and new applications are now emerging, many requiring long-range coverage and low energy consumption while operating on low data rates. These requirements have driven the emergence of new technologies, like low power wide area networks. LoRa wide area network is one of these technologies that operat...
Article
Full-text available
The sixth generation (6G) of communication networks represents more of a revolution than an evolution of the previous generations, providing new directions and innovative approaches to face the network challenges of the future. A crucial aspect is to make the best use of available resources for the support of an entirely new generation of services....
Conference Paper
Full-text available
The Internet of Things has grown in recent years and new applications are now emerging, many requiring long-range coverage and low energy consumption while operating on low data rates. These requirements have driven the emergence of new technologies, like Low Power Wide Area Networks. LoRa Wide Area Network is one of these technologies that operate...
Preprint
Full-text available
Event processing is the cornerstone of the dynamic and responsive Internet of Things (IoT). Recent approaches in this area are based on representational state transfer (REST) principles, which allow event processing tasks to be placed at any device that follows the same principles. However, the tasks should be properly distributed among edge device...
Article
Sensor networks can be federated for wide-area geographical coverage using RELOAD/CoAP architectures. In this case, proxy nodes of constrained environments form a P2P overlay to announce device resources or sensor data. Although this is a standard-based solution, consistency problems may arise because P2P resources (data objects stored at the overl...
Article
Full-text available
The management of 5G resources is a demanding task, requiring proper planning of operating numerology indexes and spectrum allocation according to current traffic needs. In addition, any reconfigurations to adapt to the current traffic pattern should be minimized to reduce signaling overhead. In this article, the pre-planning of numerology profiles...
Article
Full-text available
Improving road safety through artificial intelligence-based systems is now crucial turning smart cities into a reality. Under this highly relevant and extensive heading, an approach is proposed to improve vehicle detection in smart crosswalks using machine learning models. Contrarily to classic fuzzy classifiers, machine learning models do not requ...
Chapter
As the number of smart Things grows in the Internet of Things, so does the focus on Cloud-based Sensing as a Service for sensors and data sharing. Under this paradigm, a resource allocation model for the assignment of both sensors and Cloud resources to consumers/applications is proposed. This semantics-based resource allocation model is adequate f...
Article
Full-text available
The sensing and actuation as-a-service is an emerging business model to make sensors, actuators and data from the Internet of Things more attainable to everyday consumer. With the increase in the number of accessible Things, mashups can be created to combine services/data from one or multiple Things with services/data from virtual Web resources. Th...
Article
Full-text available
Network management tools are usually inherited from one generation to another. This was successful since these tools have been kept in check and updated regularly to fit new networking goals and service requirements. Unfortunately, new networking services will render this approach obsolete and handcrafting new tools or upgrading the current ones ma...
Chapter
Energy consumption and packet loss are common concerns in wireless sensor networks. However, designing protocols to minimize both metrics becomes very challenging because these are competing goals. In this paper, a data dissemination approach is proposed that uses probabilistic network coding to achieve a balance between energy consumption and pack...
Preprint
Full-text available
Network management tools are usually inherited from one generation to another. This was successful since these tools have been kept in check and updated regularly to fit new networking goals and service requirements. Unfortunately, new networking services will render this approach obsolete and handcrafting new tools or upgrading the current ones ma...
Article
Full-text available
Wireless sensor devices are usually powered with limited non-rechargeable batteries. This energy can easily be depleted when no wise consumption procedures are used, leaving the sensor non-functional. As most of the energy is consumed during the transmission of data, developing efficient data manipulation and transmission approaches is crucial and...
Chapter
Full-text available
En España durante el año 2018 se produjeron 3.338 atropellos cuando el peatón cruzaba por el lugar adecuado de la calzada. Anteriormente se desarrolló un sistema de señalización vial inteligente que permitía reducir la siniestralidad en los pasos de peatones. Con el objetivo de independizar la detección de vehículos de la ubicación, se ha estudiado...
Article
Full-text available
Sensing devices are expected to interconnect over large geographical areas and federations of wireless sensor networks are expected in a near future. In such environments a critical issue is how to discover the resources available at devices in a scalable manner. For this purpose, a Constrained Application Protocol (CoAP) Usage for REsource LOcatio...
Article
Representational State Transfer (REST) Application Programming Interfaces (APIs) and event processing are the cornerstone of dynamic Internet of Things. While the first one is required for device interoperability, the latter is important for autonomous and responsive systems. In recent years, both topics have received a lot of attention and have be...
Article
In distributed software-defined networking, switches can be assigned to a single master controller and one or more slave controllers, for resilience. However, only master controllers are allowed to install flow rules. Also, controllers install flow rules just at switches under their domain. This means that a particular flow may trigger the flow set...
Conference Paper
This work focuses on the placement of controllers in software-defined networking architectures. A mathematical model is developed to place controllers under multi- controller switch-controller mapping, where a switch can be assigned to multiple controllers. Resiliency, scalability, and inter-plane latency are all modeled in the proposed model. A sc...
Article
Full-text available
Switch-controller assignment is an essential task in multi-controller software-defined networking. Static assignments are not practical because network dynamics are complex and difficult to predetermine. Since network load varies both in space and time, the mapping of switches to controllers should be adaptive to sudden changes in the network. To t...
Article
Full-text available
Network coding can be very useful in achieving a balance between energy efficiency and end-to-end packet error in sensor networks, particularly if only a subset of the nodes act as encoding nodes. In this article, a mathematical model and a heuristic algorithm are proposed to plan for the best placement of encoding nodes while ensuring reliability....
Article
Full-text available
Mapping switches to controllers in multi-controller software-defined networking (SDN) is still a hot research topic. Many factors have to be considered when establishing this mapping. Among them are the load balancing and mapping stability. Load balancing is important to improve resources utilization, and mapping stability reduces the control plane...
Article
Full-text available
The Sensing as a Service is emerging as a new Internet of Things (IoT) business model for sensors and data sharing in the cloud. Under this paradigm, a resource allocation model for the assignment of both sensors and cloud resources to clients/applications is proposed. This model, contrarily to previous approaches, is adequate for emerging IoT Sens...
Chapter
This work presents a model to solve the switch migration problem in software-defined networking. This model is formulated as a mixed-integer linear programming, and compared against the static mapping approach. Two scenarios of homogeneous and heterogeneous controllers are evaluated. The experimental results show that the dynamic mapping enabled by...
Chapter
In this article, a mathematical model is developed to place controllers in multi-controller software-defined networking (SDN), while considering: resilience, scalability, and inter-plane latency. The model proved to be effective since it is able to provide resilient solutions under different fail-over scenarios, while at the same time avoid working...
Chapter
Full-text available
5G technologies will facilitate the emergence of applications integrating multiple physical Things. In such scenarios, Cloud-integrated platforms end up having a key role due to their storage and processing capabilities. Therefore, a clear understanding of Sensor Clouds, and on how Cloud mechanisms can be orchestrated to better face requests, becom...
Chapter
Full-text available
With 5G technologies new platforms for global connectivity of sensing devices are expected, many of them relying on federated sensor networks. Such federation can be done through P2P overlays where proxy nodes, of constrained environments, announce device resources or data. However, P2P resources may end up including similar device resource entries...
Conference Paper
Abstract. This work presents a model to solve the switch migration problem in software-defined networking. This model is formulated as a mixed-integer linear programming, and compared against the static mapping approach. Two scenarios of homogeneous and heterogeneous controllers are evaluated. The experimental results show that the dynamic mapping...
Conference Paper
Full-text available
In this article, a mathematical model is developed to place controllers in multi-controller software-defined networking (SDN), while considering: resilience, scalability, and inter-plane latency. The model proved to be effective since it is able to provide resilient solutions under different fail-over scenarios, while at the same time avoid working...
Chapter
As the Internet of Things is gaining momentum, the number of Internet connected devices is growing exponentially, as well as the data generated by them. This raises several issues to solve in this field, most notably the ones regarding interoperability between various devices. To ease Machine-to-Machine communication, new data models must be create...
Article
Full-text available
Wireless sensor networks are used to monitor and control physical phenomena and to provide interaction between clients and the physical environment. Clients have been typically users or user applications, but next generation wireless sensor networks will also work in machine-to-machine scenarios where some nodes can be interested in some other node...
Article
Full-text available
The emergence of smarter and broader peopleoriented IoT applications and services requires interoperability at both data and knowledge levels. However, although some semantic IoT architectures have been proposed, achieving a high degree of interoperability requires dealing with a sea of non-integrated data, scattered across vertical silos. Also, th...
Article
Full-text available
The Web of Things is a new and emerging concept that defines how the Internet of Things can be connected using common Web technologies, by standardising device interactions on upper-layer protocols. Even for devices that can only communicate using proprietary vendor technologies, upper-layer protocols can generally provide the necessary contact poi...
Article
Full-text available
Wireless sensor technologies can be used by intelligent transportation systems to provide innovative services that lead to improvements in road safety and congestion, increasing end-user satisfaction. In this article, we address vehicle routing with backup provisioning, where the possibility of reacting to overloading/overcrowding of vehicles at ce...
Conference Paper
Full-text available
The Internet of Things will bring into the Internet all kinds of smart systems, which will be able to interact with each other. Therefore, applications relying on data sharing for collaboration will increase, and effective distributed solutions for data storage become necessary. This need led to the proposal of a CoAP Usage for RELOAD, a generic P2...
Article
As simple constrained 'things' such as low-power sensors become more integrated with the Internet and accessible for interactive communication, energy efficient ways to collect and distribute data over such networks are needed. In this article we propose the use of CoRE Interfaces to build resource Collections having energy saving in mind, allowing...
Article
Extending the lifespan of a Wireless Sensor Network is a complex problem that involves several factors, ranging from device hardware capacity (batteries, processing capabilities, radio efficiency) to the chosen software stack, which is often unaccounted for by previous approaches. This paper proposes a Genetic Algorithm-based clustering optimisatio...
Article
Full-text available
In an IoT world sensor-enabled systems are all around us and accessible for management at any time and place. Besides other technological components, small unmanned aerial vehicles are also expected to have an important role in IoT as they fly at low-altitude becoming suitable data acquisition vehicles in certain situations. In this article we focu...
Conference Paper
Mainstream crowdsourcing applications for rating the accessibility of places are usually very limited in scope as only a small number of people are willing to participate, mostly the ones already interested in consuming this kind of information. We propose an extension of the schema.org ontology as a new crowdsourcing approach for engaging and moti...
Article
Wireless sensor networks (WSNs) are starting to have a high impact on our societies and, for next generation WSNs to become more integrated with the Internet, researchers recently proposed to embed IPv6 into such very constrained networks. Also, constraint application protocol (CoAP) and Observe have been proposed for RESTful services to be provide...
Article
Full-text available
FiWi architectures have been proposed as efficient solutions to provide high bandwidth and ubiquity at access network areas. In multi-radio and multi-channel FiWi scenarios an effective frequency assignment should be done to radios so that higher throughput and low delay can be obtained and the best of such architectures is achieved. However, traff...
Article
The Internet of Things is expected to incorporate objects and sensor networks of all kinds, and in particular, constrained sensor networks where energy consumption is a critical issue. In order to increase the lifetime of such networks, intelligent and standard-based solutions should be used. Here, we address this challenge through the use of CoRE...
Conference Paper
Full-text available
Wireless sensor networks (WSNs) are starting to have a huge impact on our societies. In a near future there will be large amounts of data to be collected and people will be able to easily interact with sensor devices using Web application frameworks. CoAP/Observe protocol has been recently proposed to provide RESTful services in constrained nodes a...
Article
This article presents a tutorial on how to use repeated game theory as a framework for algorithm development in communication networks. The article starts by introducing the basis of one-stage games and how the outcome of such games can be predicted, through iterative elimination and Nash equilibrium. In communication networks, however, not all pro...
Conference Paper
Full-text available
Internet of Things (IoT) is becoming a reality and new and advanced applications are expected to emerge. For applications with reliability needs to work well in IoT environments, robust data transportation is required. Approaches like TCP are known for not being adequate in sensor network environments, while UDP has been included in the 6LoWPAN sta...
Conference Paper
Full-text available
Wireless sensor networks (WSNs) gained worldwide attention and already have a high impact on our societies. For next generation WSNs one of the challenges was to integrate IPv6 over such very constrained networks, a standardization process already in progress. Together with this, the constraint application protocol (CoAP), and then the Observe exte...
Conference Paper
Full-text available
Future device to device communication using the LTE system bring new opportunities for application development. In the case of wireless sensor networks, unmanned aerial vehicles with LTE capabilities could be used to increase the network lifetime, while ensuring high transfer rates between LTE capable sensor nodes and the aerial vehicles. In this a...
Article
Full-text available
Energy saving is an important issue that should be taken into consideration when planning telecommunication networks. In fiber???wireless access networks the potential for energy consumption reduction is higher, when compared to other architectures, as many routes toward the optical section are available for nodes at the wireless section, allowing...
Conference Paper
Full-text available
Intelligent transportation systems are currently under strong research and are expected to promote the emergence of new solutions for urban transportation networks. Here we introduce a variant of the open vehicle routing problem, called vehicle routing with backup provisioning, where the possibility of reacting to overloading/overcrowding of vehicl...
Conference Paper
Full-text available
FiWi architectures have been proposed as cost effective solutions to provide high bandwidth and ubiquity at access network areas. In multi-radio and multi-channel scenarios an effective frequency assignment must be done to radios so that higher throughput and low delay can be obtained and the best of such architectures is achieved. Here we propose...
Article
New multimedia services and ubiquitous networking pose great challenges on existing access network infrastructures. To cope with such requirements new access technologies, such as the fiber-wireless (FiWi), are being developed. Together with the emergence of new access networks, efforts are being made to reduce the amount of energy required to prov...
Article
Full-text available
Energy saving (ES) in telecommunication networks is an important criterion when planning access networks. In fiber-wireless (FiWi) access networks the ES potential is high, when compared with other architectures, because different routes and optical access points can be used by routers at the wireless section. Although some proposals to increase en...
Article
Fibre-Wireless (FiWi) access networks have been proposed as flexible and cost-effective solutions for future access networks. At the wireless mesh section, wireless routers have to forward both local traffic from directly connected users and foreign traffic from neighbour wireless routers. How to allocate resources to local and foreign traffic at e...
Article
Full-text available
Energy-efficient network design has recently become a very important topic because of the energy cost increases in service providers' infrastructures. This is of particular importance in access networks because of the growing demand for digital traffic by end users. Here we address the challenge of reducing the energy consumption of fiber-wireless...
Conference Paper
Full-text available
The currently growing demand for information and communication technologies (ICTs), and multimedia services, is generating a fast expansion of digital traffic. To fulfill such demands, new generation access architectures have been proposed that try to integrate and optimize available technologies. Besides allowing new services to emerge, such archi...
Conference Paper
Full-text available
Wireless-optical approaches, leveraging on the strengths of both wireless and optical technologies, are seen as promising approaches for future access networks. For wireless-optical access networks to provide geographically continuous wireless coverage, fault-tolerance must be integrated in the design of these networks. While at the optical back en...
Conference Paper
Full-text available
Fiber-wireless (FiWi) access mesh networks have been proposed as flexible and cost-effective solutions for future access networks. However, for FiWi access mesh networks to provide end-to-end QoS guarantees to its customers, efficient QoS routing schemes and scheduling policies become necessary. Here we provide a model, using repeated game theory,...
Conference Paper
Full-text available
Wireless-optical broadband-access networks (WOBANs), currently being deployed at the access section, should integrate fault-tolerance in their design so that geographically continuous wireless coverage can be provided without service breaks. In this paper we propose a joint wireless and optical fault-tolerance planning approach for WOBANs having mu...
Article
Full-text available
The wirelessߝoptical broadband-access network (WOBAN) architecture has been proposed as a flexible and cost-effective solution for future access networks. However, for WOBANs to provide geographically continuous wireless coverage it is necessary to integrate fault tolerance in the design of such networks. At the optical back end, multiple failures,...
Conference Paper
Full-text available
The wireless-optical broadband-access network (WOBAN) architecture has been proposed as a flexible and cost-effective solution for future access networks. However, for WOBANs to provide geographically continuous wireless coverage it is necessary to integrate fault-tolerance in the design of such networks. In this paper we develop a heuristic algori...
Article
Full-text available
Providing grooming capability to optical crossconnects (OXCs) in wavelength division multiplexing (WDM) networks can allow an effective use of the network bandwidth, however, it increases the node cost that operators must sustain when compared to a non-grooming network. Therefore, operators might consider using sparse grooming instead of full groom...
Article
Full-text available
1 — The wireless-optical broadband-access network (WOBAN) architecture has been proposed as a flexible solution to meet the ever-demanding needs in access networks. At the wireless front-end multi-channel communication, with routers having multiple radio interfaces tuned to non-overlapping channels, can be used to improve network throughput in a co...