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Delay-Tolerant Mobile Sensor Network (DTMSN) distinguishes itself from traditional Wireless Sensor Network by several distinctive characteristics. Since end-to-end connections in DTMSN exist with certain probability, the conventional routing protocols for WSN may achieve poor network performance under these challenging scenarios. Hotspot-Based Adaptive Routing (HAR) is a routing scheme designed for...
Recently, sweep coverage, which is the problem of scheduling mobile sensors to periodically visit a certain number of points of interests (POIs) such that the number of mobile sensors is minimized and each of POIs can be visited periodically within a given time period, has received a great deal of attention in the wireless sensor networks. Many methods have been proposed for the sweep coverage to...
In this paper, we propose a novel range-free localization algorithm tailored for heterogeneous wireless sensor networks (WSNs), where nodes have different transmission capabilities. Two different approaches are developed to accurately derive the expected hop progress (EHP). It is shown that the obtained EHP depends solely on the information locally available at each node and, hence, can be computed...
Localization using sensor network has attracted much attention for its comparable low-cost and potential use with monitoring and targeting purposes in real and hostile application scenarios. Currently, there are many available approaches to locate persons/things based of GPS and RFID technologies. However, in some application scenario, e.g., disaster rescue application, such localization devices may...
With the aim of prolonging network lifetime, many energy efficient algorithms and data dissemination protocols have been proposed for wireless sensor networks (WSNs) recently. Since sensor nodes close to sink have to bear more traffic burden to forward data, they will quickly deplete their energy which leads to energy hole and network partition problem. Adding mobility into sensor networks brings...
A wireless sensor network is an ad hoc network with a great number of nodes which are microsensors able to collect and to transmit data in an autonomous way. The wireless sensor networks (WSNs) have known recently a much diversified use in various fields: environmental monitoring, health, protection of the borders, industry, military applications, natural safety, transport, disasters… etc. In the...
Range-free localization schemes could be a good approach to localize sensor nodes from the viewpoint of cost and energy consumption, because range-free schemes require no hardware for measuring distance or angle information. The use of a mobile beacon can improve the localization accuracy and reduce communication overhead between sensor nodes because of the mobility of a mobile beacon. A 3D range-free...
After the general principle and the calculation process of some localization algorithms of wireless sensor network being introduced and analyzed, a novel algorithm of mobile beacon trajectory is proposed in this paper. Since a static trajectory does not work well in non-uniform, and a virtual force trajectory has some defects like worse stability, a combination trajectory is proposed, which is a new...
In this paper, Byzantine attacks in wireless sensor networks with mobile access (SENMA) points is considered, where a portion of the active sensors are compromised to send false information. One effective method to combat with Byzantine attacks is the q-out-of-m scheme, where the sensing decision is based on q sensing reports out of m polled nodes. In this paper, first, by exploiting the approximately...
Based on a new range-boundary aware mobility assisted localization, we proposed a more energy efficient localization scheme which is called Time-adaptive range-boundary aware mobility-assisted localization (TRAML) to decrease the number of the transmitted packets from the point view of both the sink and the nodes. Noticed that the sink will send the beacon message periodically during the localization...
In this paper, we present a novel algorithm for improving localization results of unknown wireless nodes (a.k.a. unknowns or mobile nodes). Our proposed solution, Groupwise Universal Improvement Scheme (G-UnIS), is based on additional information about the a priori known distances between mobile nodes. We show with the simulation results that our method can enhance the accuracy of location estimation...
Topology change is the main factor that affects the network life time of Wireless Sensor Network (WSN) applications. In static WSN, the topology change is often caused by node failure which is due to energy depletion. However, in the Mobile WSN (MWSN), the main reason of the topology change is caused by the node movement. Since the mobile sensor nodes are limited in power supply and have a low radio...
Sensor networks are a sensing, computing and communication infrastructure that are able to observe and respond to phenomena in the natural environment and in our physical and cyber infrastructure. In this paper, we propose a sensor network with mobile and static sensor nodes set-up for performing tasks like sensing a phenomenon or monitoring a region. We investigate how the sensor network performs...
In wireless sensor networks (WSNs), coverage is a key factor of affection the lifetime of networks. In this paper, we study the coverage problem for network which is comprised of mobile sensor nodes with sensing radius r and communication radius R = 2r. For a possible movable redundant sensor, we present a coverage hole detection method (CHDM) by mathematic analysis, and then give a node mobility...
An increasing number of applications based on Wireless Sensor Networks assume mobile environments(Mobile WSNs). Mobile WSNs propose several converging issues with Mobile Ad-hoc Networks (MANETs) but the peculiarities of their technology and application domain advise a specific theoretical analysis of mobility impact on network connectivity. Network performance depends by several factors; there is...
This paper discusses a joining method of the mobile nodes in PANs. The mobile nodes repeat frequently a joining association at the boundary points. A joining method using hysteresis features in PANs is proposed for solving the problem. For performance analysis, the joining period of the mobile nodes in PANs is investigated and analyzed using the proposed method.
This paper concerns an efficient network configuration method of mobile nodes considering energy-balanced sensor networks. This method is based on the IEEE 802.15.4 standard. The MSBS method is proposed for performance enhancements of mobile nodes using depth, traffic, and RSSI information. The MSBS method can transfer trusted data and prevent traffic overloads from occurring at specific nodes. For...
Sink mobility has attracted much research interests in Wireless Sensor Networks (WSNs), because it could provide energy saving and reduce latency during data collection. However, the mobile sink node is still a single point of failure in many WSNs applications, thus needs to be particularly protected against adversaries. We propose in this paper a moving strategy for the mobile sink which prevents...
DV-Hop algorithm is one of the popular localization algorithms in Wireless Sensor Networks. By using the global strategy, the error of Average Distance Per-Hop (ADPH) in traditional DV-Hop is unmeasured and large in non-homogeneous density WSN. In the improved DV-Hop algorithm proposed in this paper, the upper bound of the position area is determined and "suitable" anchors participating...
A directional sensor network is composed of many directional sensor nodes. Unlike conventional omni-directional sensors that always have an omni-angle of sensing range, directional sensors may have a limited angle of sensing range due to technical constraints or cost considerations. Area coverage is still an essential issue in a directional sensor network. In this paper, we study the area coverage...
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