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Mobile sinks have been used recently, mainly to minimize energy consumption and to resolve some other issues including data collection from disconnected networks, energy depletion from sensor nodes which are close to the sink, etc. In this paper, we address the problem of finding an optimal path for the mobile sink to traverse through the sensing field, to collect a single packet from each sensor...
Wireless Sensor Networks have been used extensively for environment data collection from dense as well as simple linear structure deployments. However, the need to collect data from all sensors in the network imposes constraints on internode distances. Critical issues related to optimal resource allocation still persist for even simplistic deployments like linear and hierarchical networks. In this...
This paper proposes a novel self-learning sensor scheduling scheme, which makes the sensor energy consumption and tracking error optimal over the system operational horizon for target tracking in wireless sensor networks (WSNs). It employs Kalman filter estimation technique to predict the tracking accuracy. A performance index function is established based on the predicted energy consumption and tracking...
Technological advancements in embedded systems due to Moore's law have lead to the proliferation of wireless sensor networks (WSNs) in different application domains (e.g. defense, health care, surveillance systems) with different application requirements (e.g. lifetime, reliability). Many commercial-off-the-shelf (COTS) sensor nodes can be specialized to meet these requirements using tunable parameters...
Reducing energy consumption is one of the key challenges in sensor networks. Lots of researches have tried to turn the nodes off when not needed to reduce energy consumption. In this paper, we propose a mechanism which dynamically turns on/off different components of the node to conserve energy while maintaining required performance. We model power management problem in a sensor node as an average...
In most wireless sensor network applications a large amount of data has been continuously collected for future data query and analysis, so how to store them becomes one important challenge in such wireless sensor networks. Recently a kind of storage node has been introduced as a useful technique to solve the storage challenge, so the placement of storage node becomes an important issue in such wireless...
This work aims at minimize the cost of answering snapshot multi-predicate queries in high-communication-cost networks. High-communication-cost (HCC) networks is a family of networks where communicating data is very demanding in resources, for example in wireless sensor networks transmitting data drains the battery life of sensors involved. The important class of multi-predicate queries in horizontally...
In this paper, we consider a target-tracking sensor network and improve its energy awareness through predicting a target trajectory and decreasing sampling rate of sensors while maintaining an acceptable tracking accuracy. The tracking problem is formulated as a hierarchical Markov decision process (MDP) and is solved through neurodynamic programming. Though this is not new, improvements in performance...
We consider the problem of a transmitter transmitting to its receiver over a wireless link subject to jamming and develop two online power control algorithms for maximizing wireless link quality (transmission rate). We assume that the transmitter transmits and the jammer interferes over a period of M time slots. The impact of the jammer is to deteriorate the quality of the wireless channel during...
Service-oriented wireless sensor network (WSN) has been recently proposed as an architecture to rapidly develop applications in WSNs. In WSNs, a query task may require a set of services and may be carried out repetitively with a given frequency during its lifetime. A service composition solution shall be provided for each execution of such a persistent query task. Due to the energy saving strategy,...
A critical problem in wireless sensor networks is to maximize their lifetimes. Data aggregation is an effective method to reduce redundant data and minimize the overall energy consumption. This method requires data to be delayed and processed in their paths to the sink node, so it causes extra time delay to the networks. This paper studies the aggregation node selection problem in sensor networks...
We propose an efficient reliable data collection(eRDC) algorithm. The eRDC is designed for energy-constraint wireless sensor networks (WSN) to balance reliability and energy consumption. We derive energy efficiencies of the proposed reliability schemes, and evaluate their performances. These analyses provide a guideline to determine the number of retransmissions for reliable data delivery. Dynamic...
Routing problem is one of the most important issues to a wireless sensor network (WSN), and multicast communication has become necessary to support some new applications. In the paper, we propose an energy-aware multicast routing algorithm for WSNs. The algorithm is based on geographic routing, and defines the multicast region as rectangle that has smallest area but covers all destination nodes, where...
Power efficiency is an important design issue in embedded devices with limited power supplies. In this paper, we study a reward-based packet scheduling problem in wireless environments. We consider a general scenario in which a transmitter communicates with multiple receivers periodically. To guarantee timely transmission of data, each packet is associated with a delay constraint. The periodic data...
For target tracking in Interference Environments of cognitive radar problem, Extended Karman, Particle filter algorithms etc. are generally used to be regarded as usual solutions to state estimation. Many techniques have been developed to improve performance of target tracking. In this paper, we set the structure and key features of target's tracking design for cognitive radar, and newly propose cognitive...
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