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One of the major functions of a Wireless Sensor Network (WSN) is to provide the coverage to the network area. Many critical applications require different levels of coverage in the different parts of the network area which is generally called differential coverage. Providing differential coverage service in different period of time is a challenging due to the limited capabilities of the network nodes...
In this technical world, Sensor networks are dense wireless networks of small, low-cost sensors, which collect and disseminate environmental data. From a wireless sensor network, how fast can information can be collected and organized as tree, the above question is analyzed here. Number of design factors such as time, frequency scheduling and power control, routing are consider here, and every node...
In the densely deployed wireless sensor networks, sensors are scheduled over time in order to maintain the coverage while saving energy of networks. In this article, we investigate the coverage-aware scheduling problem using genetic algorithms. Sensors are optimally scheduled in different time slots to maximize the overall coverage under the given k-cover requirement and lifetime of networks. A set...
TDMA has been proposed as a MAC protocol for wireless sensor networks (WSNs) due to its efficiency in high WSN load. However, TDMA is plagued with shortcomings; we present modifications to TDMA that will allow for the same efficiency of TDMA, while allowing the network to conserve energy during times of low load (when there is no activity being detected). Recognizing that aggregation plays an essential...
The coverage problem in sensor networks studies how to turn redundant sensors off while maintaining a required level of coverage. The existing algorithms and protocols are proven to be effective to conserve energy and prolong network lifetime, but only support a static level of sensing coverage. In contrast, many sensor network applications may require a dynamic level of coverage, which changes from...
In this paper we discuss topology design and dimensioning of sensor networks to achieve full sensing coverage. We consider two ways of deploying the sensors, placing them according to some regular pattern or scattering them randomly, and two ways of activating the sensors, optimally according to some predefined schedule or randomly, when each sensor follows a wake-up schedule independently from the...
Wireless sensor networks (WSNs) deployed for mission-critical applications face the fundamental challenge of meeting stringent spatiotemporal performance requirements using nodes with limited sensing capacity. Although advance network planning and dense node deployment may initially achieve the required performance, they often fail to adapt to the unpredictability of physical reality. This paper explores...
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