The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Wireless sensor networks (WSNs) detect and monitor the outside physical state by the sensor nodes organizing automatically. Clustering is a standard approach for achieving efficient and scalable performance in WSNs. In the applications of analysis topology discovering, geography routing, tracking and so forth, we need to resolve how to search for the boundary nodes and form the network boundary. Different...
Wireless sensor networks (WSNs) are frameworks for modern pervasive computing infrastructures, and are often subject to operational difficulties, such as the inability to effectively mitigate signal noise or sensor failure. Natural systems, such as gene regulatory networks (GRNs), participate in similar information transport and are often subject to similar operational disruptions (noise, damage,...
How to measure and maintain connectivity is an important issue in ad hoc networks. A special case of such network is Wireless Sensor Networks (WSN), which are often deployed in harsh environments and also susceptible to a number of problems that may negatively affect the connectivity among the nodes. An additional factor that increases the cost of connectivity maintenance in ad hoc networks is when...
An efficient logical topology helps wireless sensor networks (WSNs) minimizing different constraints. For large-scale WSNs, chain oriented logical topologies are shown to be more energy conservative than other logical topologies. Chain construction is the main challenge to create a chain oriented logical topology. In this paper, we propose a chain construction scheme, which creates several chains...
In this paper, we study the performance of the Greedy Perimeter Stateless Routing (GPSR) [1] and the Greedy Routing for Maximum Lifetime (GRMax)[2] which is our proposal, in wireless sensor networks in random topology and grid topology wireless sensor network. We decide to compare the performance of GPSR and GRMax in different topology of networks using the same simulation environment. Evaluation...
Topology inference of end to end measurement overcomes the drawbacks of traditional algorithm that needs cooperation of internal node in network, And does not incur any additional burden on the network. Scholars show interests in Research Area in recent years. This paper analyzes recent new arithmetic Based on end to end date for wireless sensor networks, sums up the characteristics and the appropriate...
Topology control is a well-known strategy to save energy and extend the lifetime of wireless sensor networks. It consists of topology construction and topology maintenance algorithms. While topology construction builds a reduced topology, topology maintenance changes the reduced topology when the current one is no longer optimal. The selection of an appropriate topology maintenance technique is rarely...
This paper addresses the optimality of Network topology for localization purposes when measurements are range-only. Localization procedures based on TOA and TDOA range measurements are considered in this paper. As of now, the optimal placement of fixed terminals to locate mobile terminals has been studied based on Cramer-Rao Lower Bound (CRLB). CRLB is a universal bound on the variance of a general...
Plant automation and control are mission-critical applications and require timely and reliable data delivery, which is difficult to provide using a wireless technology. This is especially more difficult in industrial environments with harsh radio conditions. In this paper we present a dynamic and distributed topology control algorithm for Wireless Sensor Networks for use in performance critical environments...
A topology governs the logical connectivity between the nodes in the network. Development of Wireless Body Area Networks (WBANs) requires applying tailored technologies to countermeasure the effects of wireless propagation while satisfying constrains imposed by hardware. Important part of this process is topology selection as it affects the development of the entire network protocol stack. For example,...
The low cost and ease of installation of Wi-Fi equipment operating in unlicensed spectrum have made dense Wi-Fi deployments a reality in most modern urban areas. With the lack of many non-overlapping frequencies to operate on, interference among neighbor Wi-Fi cells can cause significant performance degradation. Here we study the problem of topology discovery in such dense deployments, which is necessary...
The long-thin (LT) network topology is promoted for many deployments of wireless sensor networks (WSNs) due to the application requirements. An LT topology consists of long branches of sensors, where each sensor has only one potential parent toward the sink. Data aggregation may help reduce excessive packet contention, but constraints imposed by the maximum payload size of each packet severely limit...
We present a novel topology control algorithm for very dense wireless sensor networks that is constrained by a small maximum nodal degree k. Particularly, we limit k = 4 which makes it challenging to formulate a connected network that possesses favorable properties such as a small diameter, short average path length and low energy consumption. Towards this goal, we introduce a graph theoretic approach...
In wireless sensor networks (WSNs), sensor nodes are typically subjected to energy constraints and often prone to topology changes. While duty cycling has been widely used for energy conservation in WSNs, random walks have been popular for many delay-tolerant applications in WSNs due to their many inherent desirable properties. In this paper, we consider an opportunistic forwarding under an asynchronous...
The link quality based Collection Tree Protocol (CTP) has been demonstrated an efficient and reliable routing protocol for data collection networks that deploy a clustered tree topology. However, CTP measures the link quality by packet throughput rather than transmission latency, which is not appropriate for networks supporting sensor events with transmission time deadlines. In this paper, we propose...
This paper proposes a novel Energy-Efficient Event- Driven (ESED) routing and data dissemination paradigm to address an open problem of wide interest in wireless sensor networks: the routing and data dissemination design for the applications with an event-driven data delivery model when geographic information is not available. ESED not only addresses the characteristics of such kind of applications,...
In wireless sensor networks, location-aware applications require an accurate and robust sensor localization algorithm. Among them, most of the multihop-based localization algorithms approximate the shortest path distances to the Euclidean distances. This approximation is valid only if the sensors are uniformly and densely deployed in a convex area where the shortest paths are close to straight lines...
Topology Control (TC) is a well known technique used in wireless ad hoc and sensor networks to reduce energy consumption. This technique coordinates the decisions of network nodes about their transmission power to save energy, prolong network lifetime, and mitigate MAC-level medium contention, while maintaining network connectivity. In order to ease the implementation and the study in systematic way...
Wireless networks, especially mobile ad hoc networks (MANET) and cognitive radio networks (CRN), are facing two new challenges beyond traditional random network model: opportunistic links with random nature due to fading and dynamic channel access, and dynamic network topology due to mobility and time varying. For a more general networking of Internet users as social complex networks, such challenges...
Wireless sensor nodes are symbiotic when deployed in an activity region and heavily rely on each other for successful transmission of data. Therefore, failure of some nodes can possibly partition the network. Since these networks often operate unattended, nodes need to collectively maintain connectivity and resolve any reachability problem. Most published approaches for restoring connectivity are...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.