Paulo Rogério Pereira

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The guaranteed delivery of critical data is an essential requirement in most Wireless Sensor Network (WSN) applications. The paucity of energy, communication, processing and storage resources in each WSN node causes the TCP transport model (widely used in broadband networks) to be inefficient in WSNs, a reason why new WSN-specific reliable transport(More)
Delay-Tolerant Networks (DTNs) are composed of nodes that cooperate to forward messages despite connectivity issues. This paper focuses on the problem of some nodes making limited or no contribution to the network. Misbehaving nodes consume network resources, reducing its performance and availability, therefore they constitute an important problem that(More)
This paper presents the study and implementation of a reliable transport protocol for wireless multimedia sensor networks. The work was based on an existing transport protocol for sensor networks, the DTSN (“Distributed Transport for Sensor Networks”) developed at Inesc within projects IST FP6 UbiSec&Sens, EuroFGI and FP7 EuroNF. For multimedia data(More)
This paper presents an overview of a Wireless Sensor and Actuator Network (WSAN) used to monitor an electrical power grid distribution infrastructure. The WSAN employs appropriate sensors to monitor key grid components, integrating both safety and security services, which improve the grid distribution dependability. The supported applications include, among(More)
In this paper, an implementation of a transport protocol to be used in Wireless Multimedia Sensor Networks (WMSNs) is presented. The objective of the protocol is to guarantee reliability by recovering lost packets while dealing with the limited energy, processing and memory capabilities of the devices typically used in these networks. The implemented(More)
Disruptions, high dynamism and no end-to-end communication are some of the Vehicular Delay-Tolerant Networks (VDTNs) main characteristics. This paper describes the implementation of a new VDTN multicast routing protocol which makes use of knowledge about previous encounters to estimate congestion and density and better spread data bundles and limit the(More)
Networks with frequent and long duration partitions prevent common Internet protocols from working successfully. For protocols to work properly in these Delay/Disruption Tolerant Networks (DTNs), a new protocol layer was proposed that acts on top of the transport layer for the end-to-end exchange of messages (called bundles) taking advantage of scheduled,(More)