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A coordinated multiband spectrum sensing (CMSS) policy for mobile and geographically dispersed cognitive radio networks (CRNs), referred to as cluster-CMSS, is proposed. The goal is to detect the spectrum holes and to assign each secondary user (SU) a sensing channel with the maximum probability of being empty. In geographically dispersed CRNs, channel availability varies over the space, and this...
Mobile sensors are expected to play a significant role in the next generation Internet of Things (IoT) networks, with sensors in vehicles, drones, robots and more. These mobile sensors participate in data gathering for various application scenarios. Some applications are information intensive in that huge chunks of data are required in order to make informative decisions. However, mobility in Wireless...
Wireless Sensor Networks (WSNs) received much attention from researchers thanks to its wide range of applications. Among great number of factors to measure the quality of WSNs, connectivity is always considered as one of the most important criteria. Therefore, this paper extensively focuses on ensuring the connectivity of WSNs. This problem has been proved to be NP hard. Previous studies on this field...
In this paper we propose a new clustering based data gathering mechanism for large scale wireless sensor networks. Our proposed mechanism first stores the locations of the sensors by GPS information and then sends a mobile data-collector (which can be an autonomous robot or a vehicle equipped with a transceiver and battery) which can move into the whole sensing field like a movable base station and...
Wireless sensor networks are a family of networks in wireless communication system and have the potential to become significant subsystem of engineering applications. In view of the fact that the sensor nodes in wireless sensor networks are typically irreplaceable, this type of network should operate with minimum possible energy in order to improve overall energy efficiency. Therefore, the protocols...
Expected growth in use and implementation of wireless sensor networks (WSNs) in different environments and for different applications creates new security challenges. In WSNs, a malicious node may initiate incorrect path information, change the contents of data packets, and even hijack one or more genuine network nodes. As the network reliability completely depends on individual nodespsila presence...
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