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Whenever reliable transmissions are assured by retransmission mechanisms, higher packet error incur in additional energy consumption due to packet retransmissions, even though many monitoring applications can tolerate some loss in the quality of the received images. In fact, visual information retrieved from source nodes may have different relevancies for the applications, according to the desired...
When packets are transmitted over braided-paths in visual sensor networks some intermediate nodes may relay most part of the traffic, turning part or the entire network inactive when they run out of energy. Due to the nature of visual monitoring, source nodes may have different relevancies for the application, according to the desired monitoring tasks and the current sensors' poses and fields of view...
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...
This paper investigates uniform distribution and Gaussian distribution effect on intrusion detection performance in wireless sensor networks (WSN). Deployed sensor number and sensing range of individual sensors on the intrusion distance are investigated for both the single-sensing and multiple-sensing cases, under the homogeneous sensing condition. Numerical simulations show that, the Gaussian distribution...
In this paper, we propose a location-related strategy selection (i.e., to sensing or not?) to maximize the exploitation of spatial-temporal spectrum opportunity for cognitive vehicle radios. As the distance between a secondary transmitter (ST) and a primary transmitter (PT) varies, the ST adaptively switches its strategy selection, between a listen-before-talk (LBT) strategy and a constrained-talk-without-listen...
A deployment strategy of hierarchical structure wireless sensor network. (HSWSN) is studied, HSWSN are composed basic station (BS), relay devices (RNs) and sensors (SNs). In this paper, the mode of system and energy consumption are proposed, the deployment strategy especial relay devices is proposed, and some important such that energy consumption density (ECD), distribution probability of RN consumption...
In this paper, we propose Opportunistic Carrier Prediction (OCP) that jointly addresses exposed terminal and hidden terminal problems in wireless networks. OCP is based on the rationale that past interference information can be a good indicator for the outcome of future packet delivery. Each OCP sender maintains a summary of past interference information and opportunistically accesses the channel...
A critical issue in wireless sensor networks is an energy-efficiency since the sensor batteries have limited energy power and, in most cases, are not rechargeable. The most practical manner relate to this issue is to use a node wake-up scheduling protocol that some sensor nodes stay active to provide sensing service, while the others are inactive for conserving their energy. Especially, CTC (Connected...
The mobile sensor networks (MSNs) have been widely deployed to provide an ubiquitous solution for time-sensitive applications in a specific area with low deployment cost. The monitoring area of an MSN can be divided into several sensing regions (SRs). In an SR, the mobile sensor (MS) is responsible for reporting the sensed data to the sink node. For the time-sensitive applications on MSN, the time...
Ship area networks (SANs) have lately attracted attention in order to guarantee the safety of sea travelers and marine transportation. The wireless sensor network (WSN) is one of the most important components of SAN because crew members must know any damage or malfunction of parts of ships promptly. The safety systems are mostly real-time applications, thus delay is the most important QoS requirement...
The paper proposed a distributed algorithm, namely CoBRA (Cone-based Barrier coveRage Algorithm), to achieve barrier coverage in wireless camera sensor networks (WCSNs). To the best understanding, CoBRA is the first algorithm which try to deal with the barrier coverage issue in WCSNs. Based on some observations, the basic concept of CoBRA is that each camera sensor can determine the local possible...
One of the main problems in wireless sensor networks is the successful coverage of a number of targets lying on a field and at the same time the maximization of the lifetime of the network. Many algorithms have been proposed in the literature in order to find the maximum number of disjoint or non-disjoint sets of sensors (cover sets), where one set can be active at any one time. The complexity of...
Energy efficiency is one of the most important issue to be tackled in wireless sensor networks. Activity scheduling protocols aim at prolonging the network lifetime by reducing the proportion of nodes that participate in the application. Among the vast range of criteria existing to schedule nodes activities, area coverage by connected sets is one of the most studied. Active nodes must ensure area...
It is essential to equip the sensor nodes with simple and efficient coverage boundary detection mechanisms for ensuring the network reliability and providing the required quality of service. The existing coverage boundary detection solutions require accurate knowledge of the sensors locations,which cannot be easily obtained, or they cannot provide guarantees on the coverage quality. Therefore, we...
This paper presents the possibility to model multiple instances of the multi-sensor task allocation (MSTA) problem as specializations of the multi-robot task allocation (MRTA) problem. However capturing essential characteristics of the MSTA problem requires an extension of the MRTA taxonomy to cover domain-specific features of sensor networks, leading to the need for a new taxonomy of MSTA problems.
We focus on the coverage problem in the mobile sensor network, where each node is capable of movement. Most of the prior schemes pursue coverage by uniformizing the node density or internodal distance over the area of interest. In this paper, we first argue that the uniformizing schemes are inefficient to achieve the multi-level coverage due to the phenomenon we call geometric anomaly, and that the...
We investigate reconfiguration in large-scale mobile wireless sensor networks. Consider a field of interest (FoI) divided into sub-regions, each of which has a distinct set of sensing requirements. Consider a mobile network consisting of nodes with heterogeneous sensing capabilities distributed within the FoI. We address the problem of reconfiguring the network at minimal cost so as to satisfy all...
Wireless sensor networks (WSNs) have recently emerged as a prominent technology for environmental monitoring and hazardous event detection. Yet, their success depends considerably on their ability to ensure reliable event detection. Such guarantees can be provided only if the target field monitored by a WSN does not contain coverage holes that are not monitored by any sensor. Currently, the coverage-holes...
We propose several localized sensor area coverage protocols for heterogeneous sensors, each with arbitrary sensing and transmission radii. The approach has a very small communication overhead since prior knowledge about neighbor existence is not required. Each node selects a random time out and listens to messages sent by other nodes before the time out expires. Sensor nodes whose sensing area is...
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