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The article presents an analysis of correlation-based clustering procedure in cooperative spectrum sensing. The motivation is to assess if it is more beneficial in terms of energy efficiency to group nodes according to the received signal-to-noise ratio (SNR) on the link between Primary User and node or according to the distance between nodes. To this end, a merged clustering measure is introduced...
While using Wireless Sensor Network for monitoring the remote patient's health situations, data related to that patient is stored in the sensors and the huge amount of data results in buffer and link overflow. The buffer and link overflow causes the problem of congestion which results in loss of packet and transmission delay. Congestion is a situation in which buffer overloaded with excessive data,...
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...
Reliable data delivery and congestion control are two fundamental transport layer functions of WSN. In this article we present an overview of the existing transport protocols for WSNs. We discuss the performance of different protocols based on reliability and congestion control aspects. We then present the cross layer protocols for WSN. Finally we discuss the major research issues for the design of...
In wireless sensor networks (WSNs), multi-path routing can find multiple paths from source node to sink node. In data transmission, multiple paths can be used to improve reliability, energy-efficiency, etc. In the literature, there have been many works about multi-path routing. But those multi-path routing protocols are not efficient as they cost much time and energy to construct multiple paths. In...
The energy efficiency is critical for application of wireless sensor networks, since it is a main precondition for their long-live functionality, small modification costs and reliability. This paper deals with the placement of wireless nodes based on the modeling of radio wave propagation. The methods are realized in a planning tool CANDY Wireless Site Finder that provides optimized topologies of...
A critical aspect of applications in Wireless Sensor Networks (WSNs) is network lifetime. Power-constrained WSNs are usable as long as they can communicate sensed data to a processing node. Poor communication links and hazard environment make the WSNs unreliable. The existing schemes only consider that the state of a sensor covering targets is in binary mode: success (cover the targets) or fail (cannot...
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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