Encontrados 32 documentos, a visualizar página 1 de 4
LNT: a logical neighbor tree secure group communication scheme for wireless sen...
Cheikhrouhou, Omar; Koubâa, Anis; Dini, Gianluca; Alzaid, Hani; Abid, MohamedSecure group communication is a paradigm that primarily designates one-to-many communication security. The proposed works relevant to secure group communication have predominantly considered the whole network as being a single group managed by a central powerful node capable of supporting heavy communication, computation and storage cost. However, a typical Wireless Sensor Network (WSN) may contain several grou...
Smart-HOP: a reliable handoff mechanism for mobile wireless sensor networks
Fotouhi, Hossein; Zúñiga, Marco; Alves, Mário; Koubâa, Anis; Marrón, PedroHandoff processes, the events where mobile nodes select the best access point available to transfer data, have been well studied in cellular and WiFi networks. However, wireless sensor networks (WSN) pose a new set of challenges due to their simple low-power radio transceivers and constrained resources. This paper proposes smart-HOP, a handoff mechanism tailored for mobile WSN applications. This work provides t...
Poster abstract: Smart-HOP: a reliable handoff procedure for supporting mobilit...
Fotouhi, Hossein; Alves, Mário; Koubâa, Anis; Zúñiga, MarcoThis poster abstract presents smart-HOP, a reliable handoff mechanism for mobility support in Wireless Sensor Networks (WSNs). This technique relies on a fuzzy logic approach applied at two levels: the link quality estimation level and the access point selection level. We present the conceptual design of smart-HOP and then we discuss implementation requirements and challenges.
On a reliable handoff procedure for supporting mobility in wireless sensor netw...
Fotouhi, Hossein; Alves, Mário; Koubâa, Anis; Baccour, NouhaWireless sensor network (WSN) applications such as patients’ health monitoring in hospitals, location-aware ambient intelligence, industrial monitoring /maintenance or homeland security require the support of mobile nodes or node groups. In many of these applications, the lack of network connectivity is not admissible or should at least be time bounded, i.e. mobile nodes cannot be disconnected from the rest of ...
A traffic differentiation add-on to the IEEE 802.15.4 protocol: implementation ...
Severino, Ricardo; Batsa, Manish; Alves, Mário; Koubâa, AnisThe IEEE 802.15.4 is the most widespread used protocol for Wireless Sensor Networks (WSNs) and it is being used as a baseline for several higher layer protocols such as ZigBee, 6LoWPAN or WirelessHART. Its MAC (Medium Access Control) supports both contention-free (CFP, based on the reservation of guaranteed time-slots GTS) and contention based (CAP, ruled by CSMA/CA) access, when operating in beacon-enabled mod...
Demo abstract: RadiaLE: a framework for benchmarking link quality estimators
Baccour, Nouha; Jamâa, Maissa Ben; Rosário, Denis do; Koubâa, Anis; Alves, Mário; Becker, Leandro B.; Youssef, Habib; Fotouhi, HosseinLink quality estimation is a fundamental building block for the design of several different mechanisms and protocols in wireless sensor networks (WSN). A thorough experimental evaluation of link quality estimators (LQEs) is thus mandatory. Several WSN experimental testbeds have been designed ([1–4]) but only [3] and [2] targeted link quality measurements. However, these were exploited for analyzing low-power li...
Dimensioning and worst-case analysis of cluster-tree sensor networks
Jurcik, Petr; Severino, Ricardo; Koubâa, Anis; Alves, Mário; Tovar, EduardoModeling the fundamental performance limits of Wireless Sensor Networks (WSNs) is of paramount importance to understand their behavior under the worst-case conditions and to make the appropriate design choices. This is particular relevant for time-sensitive WSN applications, where the timing behavior of the network protocols (message transmission must respect deadlines) impacts on the correct operation of these...
A vision of cyber-physical internet
Koubâa, Anis; Andersson, BjörnWhen the Internet was born, the purpose was to interconnect computers to share digital data at large-scale. On the other hand, when embedded systems were born, the objective was to control system components under real-time constraints through sensing devices, typically at small to medium scales. With the great evolution of the Information and Communication Technology (ICT), the tendency is to enable ubiquitous ...
Quality-of-service in wireless sensor networks: state-of-the-art and future dir...
Alves, Mário; Baccour, Nouha; Koubâa, Anis; Severino, Ricardo; Dini, Gianluca; Pereira, Nuno; Sá, Rui; Savino, Ida; Sousa, Paulo Gandra deWireless sensor networks (WSNs) are one of today’s most prominent instantiations of the ubiquituous computing paradigm. In order to achieve high levels of integration, WSNs need to be conceived considering requirements beyond the mere system’s functionality. While Quality-of-Service (QoS) is traditionally associated with bit/data rate, network throughput, message delay and bit/packet error rate, we believe that...
On the capacity of cluster-tree ZigBee networks
Jurcik, Petr; Koubâa, Anis; Alves, Mário; Tovar, EduardoModeling the fundamental performance limits of Wireless Sensor Networks (WSNs) is of paramount importance to understand their behavior under worst-case conditions and to make the appropriate design choices. In that direction this paper contributes with an analytical methodology for modeling cluster-tree WSNs where the data sink can either be static or mobile. We assess the validity and pessimism of analytical m...
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