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Recently, several studies have considered the use of mobile sink (MS) for data gathering in wireless sensor networks. As, it can enhance lifetime of the sensor network by distributing load among the sensors. In some delay-critical applications, a mobile sink is allowed to move along a predefined path. However, due to the predefined path and relatively slower speed of mobile sink, data gathering from...
Since our research to study mobility, we noted that the best way to represent the mobility of sensor nodes is to follow a mobility model. Numerous models have been proposed in the literature, they are commonly used as a data source in all kinds of studies, including motion in several networks. To this end, we propose to exploit this mobility, which results in the proposal of a new approach based on...
Low Power Wide Area Networks (LPWAN) technologies have recently triggered many research efforts and standardization activities due to the inherent possibility of both providing long range wireless communications and guaranteeing a long life for very cheap sensing devices. At the same time, the increasing interest of telco operators into such kind of networks is due to the wide range of applications...
Energy harvesting has been gaining a lot of attention in the past decade due to its ability to provide a-virtually-endless energy supply. Nodes in a Wireless Powered Communication Network (WPCN) depend, totally or partially, on the energy harvested from the Central Node (CN) which has a constant power supply. This work addresses a solution to the problem of lack of fairness in the distribution of...
Wireless Mesh Network (WMN) is an upcoming technology that supplements wired infrastructure with wireless backbone to provide Internet connectivity to mobile nodes (MN) or users in residential areas and offices. Here the each wireless backbone node operates both as a wireless router that forwards packets of other nodes & as a wireless bridge transmitting the packets of its clients WMN has the...
In mobile wireless sensor networks (MWSNs), each sensor has the ability not only to sense and transmit data but also to move to some specific location. Because the movement of sensors consumes much more power than that in sensing and communication, the problem of scheduling mobile sensors to cover all targets and maintain network connectivity such that the total movement distance of mobile sensors...
The problem of coverage in three-dimensional (3D) wireless sensor networks is challenging and hard. In this paper, we focus on the problem of k-coverage of a 3D field of interest (FoI), where every point is covered by at least k sensors. First, we propose three sensor placement strategies to guarantee k-coverage of a 3D FoI. Second, we compute the corresponding sensor density. Third, we investigate...
The widespread use of mobile devices has led to the continuous innovation of information service technology. This paper analyzes the problems of service implementation in the absence of infrastructure, and proposes a service optimization solution in wireless mobile network environment, which is designed from three levels of service deployment service framework and service optimization, and effectively...
Sink mobility has been proven to be an effective way for minimizing delay in data delivery and mitigating the hot spot problem in wireless sensor networks (WSNs). However, there is an impact of the path selection for the mobile sink on the data delivery delay. Hence selection of optimal number of halting positions called rendezvous points (RPs) and their locations are challenging in WSNs. In this...
The coverage of interest points (targets) by mobile sensors in Wireless Sensor Networks is a very important and challenging problem. As the sensors are deployed randomly, initial placements of sensors may not guarantee coverage of all targets. In this paper, we consider the problem of covering all the targets in the surveillance region by relocating a subset of the sensors with the objective of minimizing...
The paper discusses a solution to allow permanent access to a cloud for the devices in mobile wireless sensor networks. Concepts like Dew Computing DC distributes the cloud infrastructure but has a lack of mobility. Seamless connectivity for applications and services is ensured by implementing a mobility system over different access technologies relying on dynamic context-based routing mechanism in...
Because of the limited energies of sensors, efficient data gathering in wireless sensor network has been received a great deal of attention recently. To prolong the network lifetime, in this paper, we study the problem of scheduling a mobile sink to some specific nodes, termed anchor nodes in this paper, for data collection and reducing the energy consumption of data transmission. While considering...
Wireless Sensor Networks (WSNs) use mobile actuators for data gathering, which can effectively reduce the energy loss caused by data forwarding and prolong the network lifetime. However, mobile data gathering can't fundamentally change the fact that the energy of sensor nodes is limited. In this paper, to reduce the energy consumption due to data forwarding in wireless sensor networks, an emergency...
The location of node is a research focus in wireless sensor networks (WSNs), and it is the foundation of the service based on the node location. In this paper, we propose a new localization method to improve the moving-baseline localization(MBL) performance by using second-order system. This method takes advantage of precise properties of MBL. We improve the localization accuracy by accurate fitting...
The paper will develop a wireless sensor network suitable for the medical scene of smart community for the elderly in the community to provide quality health care services for the elderly. The project will improve positioning accuracy of the elderly in the smart community through the study of positioning algorithm. Meanwhile, the project will design a routing protocol most appropriate for medical...
This paper presents ThinGs In a Fog (TGIF)- a system designed to support interdisciplinary research that fall under the broad context of the Internet of Things. The framework is based on an Edge Computing system design that distributes application processing to system compute nodes leveraging geographic compute location diversity of a Cloud-to-the-edge to support machine-to- machine interactions that...
We study a simple one-dimensional, discrete-time network model that consists of two nodes moving on a discrete circle, changing their direction of movement randomly, and a single packet travelling in the clockwise direction, using combinations of transmissions between the two nodes (when they are co-located) and physical transports on their buffers. In this setting, we provide exact, explicit expressions...
The processing time of real-time sensing, data analytics and other applications is an important performance metric. When the application is being executed on a distributed system, the load balancing scheme among processing nodes significantly affects the total processing time of the application. We consider a load balancing scheme for distributed computing at the edge of the network. In the edge model...
Node buffer size has a big influence on performance of Mobile Opportunistic Networks (MONs). This is mainlybecause each node should temporarily cache packets to deal with the intermittently connected links. In this paper, we study fundamental bounds on node buffer size below which the network system can not achieve the expected performance. Given the condition that each link has the same probability...
In recent years, mobile data gathering in wireless sensor networks has attracted much interests in the research community. However, despite extensive efforts, many of previous work in this area lies only in theory and evaluates network performance with computer simulations, which leaves a large gap from reality. In this paper, we present the design and implementation of a general purpose, flexible...
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