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Fault-tolerance is one of the main issues in Wireless Sensor Networks (WSNs) where applications require a continuous service. In this paper, we show how to use a small number of mobile robots to handle failures that may occur in the WSN. We study two strategies: Centralized Manager Strategy (CMS) and CMS with anticipation noted by CMS* to detect, report(More)
Generally, with a limited number of fixed priorities () within a network, applications sharing a same priority are scheduled according to First in First out (IIO) discipline. This policy is called FP/FIFO. However real time applications have deadline requirements which aren't taken into account with the IIO discipline. That is why we propose to introduce(More)
—In this paper, we focus on applications with quantitative QoS (Quality of Service) requirements in their end-to-end response time. Two types of quantitative QoS garantees can be delivered by a network: deterministic and probabilistic. The deterministic approach is based on a worst case analysis. The probabilistic approach uses a mathematical model to(More)
Providing a continuous service is the main requirement for many application types deployed in Wireless Sensor Networks (WSNs). In this paper, we study two maintenance strategies using a small number of mobile maintainer robots to restore the WSN coverage and connectivity upon a sensor failure: the Centralized Maintenance Strategy (CMS) and the Centralized(More)
In this paper, we have proposed two distributed preventive maintenance strategies dedicated for large-scale wireless sensor networks (WSNs) using a reduced number of mobile robots : (i) Fixed Distributed Preventive Maintenance Strategy denoted by F-DPMS, (ii) Adaptive Distributed Preventive Maintenance Strategy denoted by A-DPMS. F-DPMS and A-DPMS are(More)
Generally, the Quality of Service (QoS) in a wireless sensor network (WSN) is measured by the sensing area coverage degree and the connectivity between the deployed sensors. To conserve and protect these QoS parameters, we have used a limited number of mobile maintainer robots to handle the eventual network failed sensors. In this paper, we have introduced(More)
1-Articles dans des revues internationales ou nationales avec comité de lecture répertoriées dans les bases de données internationales [ACL] : 12 1.1-Revues internationales majeures avec comité de lecture : 10 1. A. Fourati and K. Al Agha. " Detecting forged routing messages in ad hoc networks ". Looking for network functionalities' extension by avoiding(More)