Cognitive Radio (CR) technology has gained popularity in Wireless Sensor Networks (WSN) because of scarcity caused by the increase in number of wireless devices and service, and it provides spectrumefficient communication for the resource constrained WSNs. However, appropriate protocols have to be devised to satisfy the requirements of both WSNs and CRs and to enjoy the benefits of cognition in...

Cognitive Radio (CR) technology has gained popularity in Wireless Sensor Networks (WSN) because of scarcity caused by the increase in number of wireless devices and service, and it provides spectrumefficient communication for the resource constrained WSNs. However, appropriate protocols have to be devised to satisfy the requirements of both WSNs and CRs and to enjoy the benefits of cognition in...

In this paper, we study the Minimum Latency Broadcast Scheduling (MLBS) problem in wireless sensor networks (WSNs). The main issue of the MLBS problem is to compute schedules with the minimum number of timeslots such that a base station can broadcast data to all other sensor nodes with no collisions. Unlike existing works that utilize the traditional omni-directional WSNs, we target the directi...

coverage improvement is one of the main problems in wireless sensor networks. given a finite number of sensors, improvement of the sensor deployment will provide sufficient sensor coverage and save cost of sensors for locating in grid points. for achieving good coverage, the sensors should be placed in adequate places. this paper uses the genetic and learning automata as intelligent methods for...

Wireless sensor networks (WSNs) assume a collection of tiny sensing devices connected wirelessly and which are used to observe and monitor a variety of phenomena in the real physical world. Time synchronization is an important issue in wireless sensor networks. Many applications based on these WSNs assume local clocks need to be synchronized to a common view of clock at each sensor node. Some e...

White spaces represent unoccupied TV spectrum that could be used for wireless communication by unlicensed devices, just like Wi-Fi and ZigBee devices can use the ISM bands. This low-frequency spectrum enables high bandwidth communication at long transmission ranges. In this paper, we propose a system that leverages the benefits of white spaces for sensor networks, with a view to overcoming the ...

Wireless Sensor Networks (WSNs) continue to grow and become widely used in many applications in military, ecological, home automation and health-related areas. Due to distributed nature of sensor networks security becomes fundamental requirement for communication among sensor nodes. The inclusion of wireless communication among various sensor nodes suffers from various types of security threats...

As the scale of the network increases, especially wireless and mobile networks come into fashion. Recent advances in wireless sensor networks have led to many new protocols specifically designed for sensor networks where energy awareness is an essential consideration. In this paper, the emphasis is on the study of Hierarchical routing protocols in wireless sensor networks (WSNs) since they migh...

Wireless Sensor Networks (WSNs) are arising from the proliferation of Micro-Electro-Mechanical Systems (MEMS) technology as an important new area in wireless technology. They are composed of tiny devices which monitor physical or environmental conditions such as temperature, pressure, motion or pollutants, etc. Moreover, the accuracy of individual sensor node readings is decisive in WSN applica...

Wireless Sensor Networks (WSNs) are used in many applications in military, ecological, and health-related areas. These applications often include the monitoring of sensitive information such as enemy movement on the battlefield or the location of personnel in a building. Security is therefore important in WSNs. However, WSNs suffer from many constraints, including low computation capability, sm...