In this paper, we present an industrial development of a wireless sensor network technology called OCARI: optimization communication for ad hoc reliable networks. It targets applications in harsh environments such as power plants and warships. OCARI is wireless-communication that supports mesh topology power-aware routing protocol aimed at maximizing the lifetime. based on IEEE 802.15.4 physical layer with deterministic media access control time-constrained communication. During...

The myriad of potential applications supported by wireless sensor networks (WSNs) has generated much interest from the research community. Various range small size low industrial monitoring to large scale energy constrained environmental monitoring. In all cases, an operational network is required fulfill application missions. addition, consumption nodes a great challenge in order maximize lifetime. Unlike other networks, it can be hazardous, very expensive or even impossible charge replace...

The diversity of the applications supported by wireless ad hoc and sensor networks explain success these networks. However, their energy constrained nature requires use efficient strategies to maximize network lifetime. We can classify in four categories: 1. routing, 2. scheduling nodes sleeping state, 3. topology control tuning node transmission power 4. reducing volume information transferred. For each category, a state art is given new protocols are presented. best efficiency will be...

Abstract The IEEE 802.15.4e MAC amendment has been proposed to meet the requirements of industrial applications. Using slotted medium access with channel hopping, layer orchestrates accesses nodes according a given schedule. Nevertheless, this does not specify how schedule is computed. purpose paper propose distributed joint time slot and assignment, called W v e , for data gathering in low‐power lossy networks. This targets minimised convergecast delays by reducing total number slots...

Wireless sensor networks (WSNs) have many fields of application, including industrial, environmental and military domains. Monitoring a given zone is one the main goals this technology. This consists in deploying nodes order to detect any event occurring report it sink. We present survey that focuses on coverage connectivity issues WSNs. motivate our study by giving different use cases corresponding coverage, connectivity, latency robustness requirements applications considered. general...

Energy efficiency is a key issue in wireless ad hoc and sensor networks. Several directions have been explored to maximize network lifetime, among them energy efficient routing. In this paper, we show how extend the standardized OLSR routing protocol, order make it efficient. To take into account residual node energy, three new selection algorithms of multipoint relays, based on minimum are evaluated, best one chosen. This extension selects path minimizing consumed end-to-end transmission...

In aerospace applications, wireless sensor networks (WSNs) collect data from nodes towards a sink in multi-hop convergecast structure. The throughput requirement of these applications is difficult to meet with single channel. That why, this paper, we focus on multichannel time slot assignment that minimizes the gathering cycle. We first formalize problem as linear program and compute optimal needed for raw various topologies. These times apply sinks equipped one or several radio interfaces....

Wireless sensor networks (WSNs) have many fields of application, including industrial, environmental and military domains. Monitoring a given zone is one the main goals this technology. This consists in deploying nodes order to detect any event occurring report it sink. We present survey that focuses on coverage connectivity issues WSNs. motivate our study by giving different use cases corresponding coverage, connectivity, latency robustness requirements applications considered. general...

With the current increase in ad-hoc mobile networks public domains (e.g. airports, cities, etc.), and widespread use of IEEE 802.11 wireless LAN, there is a growing need to handle manage fast mobility. Extending coverage area taking into account mobility routing protocols could offer complementary solution UMTS for fourth generation (4G) networks. In this paper we present an extension optimized link state protocol (OLSR), denoted Fast-OLSR, which designed meet (MANETs). Performance...

Mobile ad hoc networks have very attractive intrinsic qualities. However they will be adopted only if are able to support applications with QoS requirements. They should provide a route providing the requested by flow. The OLSR routing protocol can extended for that purpose. relies on multipoint relay (MPR) selection has an important effect protocol's performances. Indeed, overhead generated and more particularly flooding efficiency depend MPR selection. Moreover, MPRs used as intermediate...

In many applications such as precision agriculture (fruit tree plantation, olive groves) or environmental monitoring, wireless sensors are, very often, randomly scattered in the 3D area of interest. Such require full three-dimensional coverage. Undoubtedly, an initial random deployment does not achieve neither coverage interest, nor network connectivity. Thus, a redeployment algorithm has to be introduced order ensure these two goals. Our contribution is design 3D-DVFA, distributed based on...

Content Delivery Networks (CDNs) are faced with an increasing and time varying demand of video contents. Their ability to promptly react this is a success factor. Caching helps, but the question is: which contents cache? Considering that most popular should be cached, paper focuses on how predict popularity With real traces extracted from YouTube, we show Auto-Regressive Moving Average (ARMA) models can provide accurate predictions. We propose original solution combining predictions several...

In this paper, we are interested in real-time flows requiring quantitative and deterministic QoS (quality of service) guarantees. We focus more particularly on two parameters: the worst case end-to-end response time jitter. consider a FIFO (first first out) scheduling flows. The is simplest one to implement very used. establish bound any flow network, using trajectory approach. present an example illustrating our results. Finally, show how apply these results EF (expedited forwarding) class...

Wireless Sensor Networks should be self-organized to enhance the coverage after an initial random deployment. Virtual Forces Algorithm, VFA, is one of most efficient algorithms proposed in literature. Simulation results prove that use this algorithm does not achieve full and connectivity some cases, even when number sensors sufficient. Because that, our contribution propose improvement ensure coverage, fault-tolerance, while saving energy. Our final version Dth_Lmax_Serialized_V FA achieves...

The new IEEE 802.15.4e standard does not specify how the schedule of medium accesses followed by wireless sensors is built. That why, we propose a distributed interference-aware joint channel and time slot assignment, called DiSCA, for traffic-aware convergecast in multichannel sensor networks (WSNs). Unlike most previous studies, consider two cases transmissions: without acknowledgment with immediate acknowledgment. We provide minimum bound on number slots needed sink equipped multiple...

The IoT is a technology that enables the inter-connection of smart physical and virtual objects provides advanced services. Objects or things are generally constrained devices which limited by their energy, computing storage capacity. A Wireless Sensor Networks (WSN) network composed managed CPAN (Personal Area Network Coordinator). used in order to gather process data given environment. It characterized low bit rate power consumption, it uses small size packet transmissions. In protect WSN,...