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Wireless sensor networks are employed in diverse range and are growing area of research and development due to the importance and necessity of applications. Wireless sensor networks depend on batteries with limited power and cannot be recharged or replaced often. Extending the lifetime of wireless sensor networks is a key issue that is being discussed in recent years. The lifetime of the wireless...
In a Wireless Sensor Network, the medium access control (MAC) layer protocol design is very important due to the constraint of the limited processing capability and the power on wireless sensors. Recently, the IEEE released a revised version of the IEEE 802.15.4, referred to as IEEE 802.15.4e, which defined the Slotted Channel Hopping (TSCH) mechanism. The TSCH then adopted the slotframe structure...
Epileptic seizures and dangerous falls affect over 100 million people worldwide, including patients and seniors. There is currently no affordable solution or product for the detection of seizures and falls to assist in improving the lives of millions. Such detection problem poses several major challenges, including continuous sensing with minimal user disruption, accurate real-time emergency classification...
A cooperative cognitive radio (CR) network that accomplishes both spectrum sensing (SS) and sharing is considered in this work. System model is assumed to be a cognitive ad hoc network that consists of multiple secondary transmitter (ST) and receiver (SR) pairs sharing transmission over a spectrum with a primary network of single transmitter-receiver pair. Based on SS outcome, secondary users (SUs)...
In dynamic networks, if the nodes are not scattered uniformly in area, to guarantee the coverage is difficult. However, we cannot use uniformly deployment strategy all the time. Uniformly scattering the nodes increases unbalanced traffic pattern in dynamic networks. Clustering seems a good solution for most problems of dynamic networks. However, there is another serious problem. Cluster heads (CHs)...
Sensor nodes depend on power source, but they deplete rapidly. The major issues of Wireless Sensor Network (WSN) are its energy source constraints. We are able to solve this issue by using clustering architecture. In this paper we study about various clustering techniques used in WSN. The large-scale deployment of WSNs and the need for data aggregation resolve this issue mainly. Clustering is best...
In the last years, the continuous demand for smart applications in the Internet of Things context is leading to the develop of novel and more complex UHF RFID tags with augmented capabilities. Novel tags offer additional functionalities besides identification by embedding sensors, actuators, and processing units. In this work a new kind of device, called SPARTACUS, is presented. While being completely...
Health monitoring system has been an important application in the last decade. There are many types of health sensors that make this system worth and real like wearable sensor, bed sensor and ECG sensor. Primarily, these sensors operate on the license-free 2.4-GHz industrial, scientific, and medical band (ISM). This feature makes this system not only easily applicable, but also probably vulnerable...
The application of communication protocols and wireless networking techniques are recent advancements for energy efficient implementation of automatic adaptive lighting control system. A review of communication protocols and wireless networking systems for lighting control is presented in this paper. The frame structure, communication methods, topologies, protocol stack architecture of standard protocols...
In wireless Sensor Networks (WSNs), node placement plays a significant role to meet design goals such as cost effectiveness, connectivity, lifetime, and data latency. In this paper, we propose a new algorithm to assist in the placement of nodes for a WSN who monitors an underground tunnel infrastructure. To improve WSN's nodes utilization rate, we defines a minimization problem of distances between...
Barrier coverage is attractive for many practical applications of wireless sensor networks. In stationary networks, if the number of deployed sensors is not large enough, the intruder may pass though the barrier gaps undetected. Recently, using mobile sensors to repair gaps and improve network barrier coverage performance has attracted much attention. We focus on constructing energy efficient strong...
Applying cognitive radio technologies to wireless sensor networks (WSNs) explores new possibilities for network architectures. The cognitive radio technology enables opportunistic access of unlicensed sensor nodes to licensed bands without influencing primary users (PUs). Spectrum sensing is a key technology to identify the presence of PUs. Benefit from the diversity of different sensors, Cooperative...
Recently, Wireless Sensor Networks (WSNs) and its applications have obtained considerable momentum due to its growing usage in different applications. However, security and power limits of WSNs are still important matters especially during routing since the early beginning of this research due to few of previous studies take into consideration security threats and energy consumption at the same time...
The present era of wireless communication system has witnessed a maximized score of interest in adopting a specialized branch called as Wireless Sensor Network. Although, the research on the concept is more than a decade old, still WSN is shrouded by various types of operational loopholes, which decreases the technical adoption of the commercial practices of the protocols. The proposed paper has addressed...
We investigate the energy efficiency with the relation of area spectral efficiency of a cognitive radio network using stochastic geometry approach. Network coverage probabilities are derived for the interference of cognitive transmitters and primary transmitters, with consideration of two important parameters: probability of ideal channel and probability of transmission schedule. Furthermore, we formulate...
This paper aims to demonstrate a new concept for the street lighting area in a Smart Grid environment. It presents a developed electronic device, which allows control and Telemanagement functions of the street lighting system, through a Mesh ZigBee network. Besides, it presents the achieved results with the deployment of a pilot project where high-pressure sodium lamps were replaced by LED lamps equipped...
Wireless communication technology and the electronic systems advancements have laid the foundation of the wireless sensor network which achieves the growth of low-cost, low power and multi-functional sensor nodes which can be deployed on a single chip to communicate over a short range. The sensor node consists of sensing elements, actuator and a limited source of energy as battery. The major problem...
Wireless Sensor Network (WSN) and low power smart device network (Internet of Things) are fast growing technologies used in wide range applications. In IoT nodes are defined as sensor/actuators, which are highly constrained in nature (limited in energy and CPU usage). Designing energy efficient network architecture and routing mechanism is a great challenge in IoT networks. The network is said as...
Recently wireless sensor networks have been shown to be very attractive for many wireless communications applications. A large number of very tiny sensors spread over the area under consideration constitute the wireless sensor networks. These tiny sensors have limited power resources. Due to limited built-in battery life-time at each sensor, minimizing power consumption in the sensors is an important...
In energy-limited wireless sensor networks, the sensor scheduling is an appropriate technique for minimizing node energy consumption and maximizing network coverage lifetime. The challenge is to determine an appropriate scheduling mechanism for the nodes in order to maintain sufficient count of active nodes for maximum network coverage. Existing works on coverage optimization based scheduling mechanism,...
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