Browsing by Author "Manirabona, Audace"

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    Design and performances evaluation of a wban monitoring system for mobile people in a cooperative environment
    (UB, École Nationale d’Ingénieurs de Sfax, 2016) Manirabona, Audace
    People normally live in community and often work in group, and the WBAN applications intends to reinforce this way of living. WBAN subjects as persons should interact cooperatively each other by providing information redundancy, better coverage, etc. and so improve the WBAN's quality of service. As WBAN subjects are likely to move, the localization service is important for emergency, guidance, securing etc. The main goal of this thesis is to o er to a user a system with a high quality, that should ensure the quality of intra/inter-WBANs transmissions, be less energy consumer and adaptable to changes of environment. To ful ll these requirements, cooperation mechanisms are a chosen as solution and localization service is studied due to mobility e ects. Apart from a survey on WBAN technology, applications and services, and WBAN based monitoring systems projects, this thesis encompasses three main parts: The rst part proposes a 4-tiers architecture for WBAN-MS to sustain mobility. It is a really improvement of a 3-tiers architecture mostly used for healthcare monitoring systems. Noticing that there is so far no mechanisms proposed for tra cs going out of WBAN, it is proposed to implement at the coordinator a Priority Weighted Round Robin (PWRR)scheduling technique to bridge sensitive data from WBAN to peer-networks. The second part deals with the intra-WBAN and inter-WBANs cooperation. For this end, a Decode and Merge cooperative MAC mechanism is de ned for intra WBAN and a NetBAN, a concept of network of BANs, is designed for inter-WBANs cooperation with a routing protocol to optimize energy consumption. The third part undergoes the localization problem in WBAN. Thus, from a survey on WBAN localization mechanisms, a comparative study was done fallowed by a cooperative technique based on body posture detection is given. It is also proposed a kridged ngerprinting mechanism for WBAN indoor localization and a localization technique based on Kalman lter and kriging using environmental data for WBAN outdoor localization. Finally, new horizons are described as open issues.
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    iITLMA, an Intelligent Traffic Light Management Algorithm based on Wireless Sensor Networks
    (Wireless Personal Communications, 2023) Epela, Bernard; Manirabona, Audace; Nahayo, Fulgence
    The rapid increase of vehicle population in many world cities implies the increase of road and accidents. Fortunately, intelligent transport systems (ITS) with traffic signals come to solve or at lease minimize the road problems by guaranteeing for instance safe driving at road intersections. However, they can disturb and reduce the traffic fluency due to the queue delay at each traffic flow if environmental information is not taken into account. This paper aims to overcome the above concern by studying the use of distributed systems to implement intelligent transport systems through a wireless sensor network. The proposed solution is a combination of a detection unit and two communicating sensors deployed on the tracks that can react to the passage of a vehicle. This work focuses on a four-lane intersection and an algorithm allowing sensors to cooperate and manage traffic in real time according to traffic conditions is developed. The experiment area where data have been collected is Bujumbura city, the capital of Burundi. The results of data computation show that our algorithm allows a reduction of 10% in waiting time in the case of rush hours and 32% in the case of normal hours. It leads also to the maximization of the number of vehicles passing through each intersection, which allows an improvement of road safety by reducing road accidents.