Atento: um detector de defeitos para MANETs baseado na potência do sinal

Abstract

Fault detector is an essential component in building reliable distributed systems and its design depends heavily on the model of distributed system, which has demanded several solutions to address the movement of nodes. This dissertation presents a gossip-based unreliable failure detector for mobile ad hoc networks (MANETs) that uses the intensity of received signal to differ faulty nodes from mobile nodes. The differentiation is done by maintaining information on the intensity measurement signal reception in the nodes of the system in a small historic regions. This work also presents a simulator for mobile wireless networks where is possible configure simulations messaging with pre-determined movements of the nodes in the network. The simulator provides the signal strength received in a message, and allows configuration simulate various aspects such as frequency and intensity transmission of a message. The failure detector presented in this work provides a new method that uses more than one rule for deciding to suspect a node. Surveys show improvements in service quality of the detector compared with the traditional gossip algorithm.