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For WSNs, many data dissemination protocols have been proposed for mobile sink groups, in which sinks are spatially apart each other in their close proximity and move together according to group mobility. Most previous works cannot be directly applied to mobile sink groups due to the control overhead caused by the individual mobility in the group. M-geocasting protocol considers both of data dissemination...
A novel method of identifying boundaries of wireless sensor networks deployed on 2D and 3D surfaces is presented. It does not require costly, error prone localization algorithms or physical locations of nodes. Instead, a Virtual Coordinate System (VCS) is used in which each node is characterized by the hop- distances to a set of randomly selected nodes known as anchors. To use geometric relationships...
Given the ever-increasing popularity of wireless body area networks (WBANs), in some application scenarios, many WBANs may operate densely and lead to a high mutual interference. Excessive interference may severely degrade the network performance, which is called the network co- existence problem. It is critical to fully understand the network co-existence problem to ensure the effectiveness and efficiency...
In this paper, we propose a coordinate-free distributed boundary detection algorithm (CDBD). It adopts general sensing and communication models and exploits two centrality measures, i.e., betweenness and closeness. For CDBD, each node only needs to communicate with its $k$-hop neighbors twice and makes decision whether it itself is a boundary node independently. CDBD has advantages of fast convergence...
Simple yet cost effective hybrid Wireless Sensor Networks (WSN) with both standard nodes and transmit-only nodes are promising for their great potential as the "edge" of the "Internet of Things". However the lack of receivers at many transmit-only nodes in the hybrid network renders most existing MAC protocols invalid. Our previous efforts showed the benefits of this hybrid architecture...
The great diversity of mobile sensor networks (MSNs) has emerged in different networks, including vehicular ad-hoc networks (VANETs), underwater sensor networks (UWSNs), and wireless body area networks (WBANs), which provide ubiquitous solutions for real-time monitoring. To prolong the network lifetime of MSNs, energy conservation for mobile sensors needs to be taken into consideration while we design...
In this paper, we propose a novel distributed navigation algorithm for people to escape from critical event region in wireless sensor networks (WSNs). Unlike existing works, the scenario discussed in the paper has no goal or exit as guidance, leading to a big challenge for the navigation problem. To solve it, our proposed navigation algorithm computes the convex hull of the event region just by some...
In many applications of Wireless Sensor Networks (WSN), the source of an event needs to be protected. In resource constrained WSN, providing source anonymity is a challenging task. A traditional approach for hiding source in WSN is to let all nodes generate dummy data packets even if they have no event to report. However, this kind of approach introduces large overhead. In order to reduce the large...
This work discusses enhancing the neuroWSN architecture that has been developed for spatial thermal mapping with query system for time synchronization and relevant aggregation at the sensor level. The neural net training process at the cluster head requires synchronization of the incoming data from all the portable nodes. An approach for buffering and query management system is proposed here to fulfil...
The new age technologies like Micro-Electro-Mechanical Systems for development of smart sensors, small transceivers and low-priced hardware are fueling increased interest in Wireless Sensor Networks. Functioning of Wireless Sensor Networks is distributed across nodes and there is no fixed infrastructure control. This in turn requires carefully designed Medium Access Control layer protocols. This paper...
In this paper, we focus on the problem of how to strike a balance between the QoS provisioning and the energy consumption when a cooperative communication scheme is applied in a clustered wireless sensor network. We characterize this tradeoff by a multi-variable optimization problem, with the goals of jointly maximizing the outage performance and the network lifetime. Then, we horizontally decompose...
In surveillance related Wireless Sensor Networks (WSNs) applications, mobile targets can utilize intelligent motion planning in robotics to avoid detection, which could impose great threats on the sensor field. In this paper, we propose countermeasures against mobile target motion planning. The proposed solution enables the sensors to interfere the localization and map generation on mobile targets...
In wireless sensor networks, one of the most important challenge is power saving, then various contributions are suggested since a decade. In this paper, we propose a distributed and an adaptive gossiping technique able to guarantee communications over all sensors and to save a high amount of energy. The aim is to allow to the network to achieve a self organizing procedure in order to provide an efficient...
In wireless sensor networks (WSNs), attackers could inject false data into the networks by compromising the sensor nodes. False data injected by the compromised nodes, if undetected, could not only cause false alarms but also consume the limited energy of the sensor nodes, posing serious threats to the lifetime of networks. To mitigate this type of attacks, a number of en-route filtering schemes to...
For large-scale sensor networks deployed for data gathering, energy efficiency is critically required. Elimination the data correlation is a promising technique for energy efficiency. Compressive Data Gathering (CDG) which employs distributed coding to compress data correlation is an important approach in this area. However, the CDG scheme uses a uniform pattern in data transmission, where all nodes...
Today's abundance of sensors and their wireless/wired networks, coupled with a growing plethora of applications, necessitate a dynamic approach to the assignment of tasks to a network. The current practice in WSN design is almost always application specific, due to functional and resource tradeoffs that have justified much of the tailored research done so far. Identifying this as a major bottleneck...
Wireless sensor networks (WSNs) have attracted a great deal of study due to the low cost of sensors and their wide range of applications. Most of the sensors used so far are point sensors which have disc-shaped sensing and communication areas. Energy-efficient communication is an important issue in WSNs because of the limited power resource and the inconvenience to recharge sensor batteries frequently...
Beaconless position-based forwarding protocols have recently evolved as a promising solution for packet forwarding in wireless sensor networks. However, as the network density grows, the overhead incurred grows significantly. As such, end-to-end energy and delay performance is adversely impacted. Motivated by the need for a forwarding mechanism that is more tolerant to growth in node density, an alternative...
The purpose of this paper is to represent a wind powered wireless sensor network system and introduce a novel transmission power control scheme based on remaining energy level and energy harvesting status to extend the lifetime of WSNs. Energy constraint has always been one of the most significant problems of wireless sensor networks along with the development. Many methods have been introduced to...
Wireless data gathering networks are often tasked to gather correlated data under severe energy constraints. The use of simple channel codes with source-channel decoding can potentially provide good performance with low energy consumption. Here we consider progressive coding in multi-hop networks, where an intermediate node decodes its received noisy codewords. The estimated information is concatenated...
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