Research Reports
Permanent URI for this collectionhttp://dl.cerist.dz/handle/CERIST/34
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Item Efficient QoS-aware Heterogeneous Architecture for Energy-Delay Constrained Connected Objects(CERIST, 2016) Doudou, Messaoud; Rault, Tifenn; Bouabdallah, AbdelmadjidConnected objects such as smart phones and wireless sensors becomes very attractive for our assisted daily life applications, because it offers continuous monitoring capability of both personal and environmental parameters. However, these systems still face a major energy issue that prevent their wide adoption. Indeed, continuous sampling and communication tasks quickly deplete sensors and gateways battery reserves, and frequent battery replacement are not convenient. One solution to address such a challenge consists in minimizing the activation of radio interfaces and switching between them in order to achieve very low duty cycle. In this paper, we propose a new efficient communication architecture for patient supervision in the context of healthcare application making use of dual radio. At runtime, our solution determines the optimal interval parameters of switching on/off each radio interfaces in order to minimize the energy consumption of both sensors and mobile phones while satisfying the QoS requirements. The proposed solution is adequately analyzed and numerically compared against a solution without QoS. The results show that our proposed architecture exhibits better duty-cycle reduction while satisfying the delay constraints.Item MSR : Minimum-Stop Recharging Scheme for Wireless Rechargeable Sensor Networks(CERIST, 2014-07-02) Khelladi, Lyes; Djenouri, Djamel; Badache, Nadjib; Bouabdallah, Abdelmadjid; Lasla, NoureddineThis paper deals with simultaneous energy transfer to multiple nodes for scalable wireless recharging in wireless sensor networks. All existing recharging schemes rely on the use of a mobile charger that roves the network and drops by some locations for nodes recharging. However, they focus on the efficiency of energy transfer and neglect the energy engendered by the charger movement. This is tackled in this paper, where the wireless charging is modeled as a path optimization problem for the mobile charger, with objective function to minimizing the number of stop locations in the path. Due to the NP-harness of the problem, we propose a simple but efficient heuristic. It is based on clique partitioning to find the minimum number of locations allowing the mobile charger to replenish all the node’s batteries in the network. Evaluation results demonstrate that the proposed approach significantly reduces the total energy consumption of the mobile charger, while using a low-complexity techniques that permit scalability to a higher number of nodes.Item Securing Distance Vector Routing Protocols for Hybrid Wireless Mish Networks(CERIST, 2010-04) Babakhouya, Abdelaziz; Challal, Yacine; Bouabdallah, Abdelmadjid; Gharout, SaidHybrid Wireless Mesh Networks (HWMNs) are currently emerging as a promising technology for a wide range of applications such as public safety, emergency response, and disaster recovery operations. HWMNs combine the concepts of mesh networks and ad hoc networks to maintain network connectivity. Routing is essential for HWMN in order to discover the network topology and built routes. The problem of all the current ad hoc routing protocols is that they trust all nodes and assume that they behave properly; therefore they are more vulnerable to nodes misbehavior. Misbehaving nodes can advertise incorrect routing information and disturb the topology building process. This attack is difficult to detect in distance vector routing protocols since nodes have no information regarding the network topology beyond the immediate neighbors. In this paper we propose a Consistency Check protocol for Distance Vector routing in HWMN environment. Our Consistency Check protocol can detect and reject false routes under the assumption that some mesh routers are trusted and do not cheat. Trough security analysis and simulation, we show that our approach is resilient to false accusation attacks while inducing an acceptable routing overhead.Item A survey on Wireless Sensor Networks for Urban Traffic Monitoring: Applications and Architectures(CERIST, 2012) Kafi, Mohamed Amine; Badache, Nadjib; Challal, Yacine; Bouabdallah, Abdelmadjid; Djenouri, DjamelVehicular traffic is increasing around the world, especially in urban areas. This increase results in a huge traffic congestion, which has dramatic consequences on economy, human health, and environment. Traditional methods used for traffic management, surveillance and control become inefficient in terms of performance, cost, maintenance, and support, with the increased traffic. Wireless sensor networking (WSN) is an emergent technology with an effective potential to overcome these difficulties, which will have a great added value to intelligent transportation systems (ITS). This technology enables a new broad range of smart city applications around urban sensing. This includes a variety of applications such as traffic safety, traffic congestion control, road state monitoring, vehicular safety warning services, and parking lots management. In this survey, a review on traffic management projects and solutions is provided. The architectural and engineering challenges are discussed, and some future trends are highlighted.Item A study of Wireless Sensor Network Architectures and Projects for Traffic Light Monitoring(CERIST, 2012) Kafi, Mohamed Amine; Badache, Nadjib; Challal, Yacine; Bouabdallah, Abdelmadjid; Djenouri, DjamelVehicular traffic is increasing around the world, especially in urban areas. This increase results in a huge traffic congestion, which has dramatic consequences on economy, human health, and environment. Traditional methods used for traffic management, surveillance and control become inefficient in terms of performance, cost, maintenance, and support, with the increased traffic. Wireless Sensor Networks (WSN) is an emergent technology with an effective potential to overcome these difficulties, and will have a great added value to intelligent transportation systems (ITS) overall. In this survey, we review traffic light projects and solutions. We discuss their architectural and engineering challenges, and shed some light on the future trends as well.