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Wireless Sensor Networks (WSNs) consist of small devices with processing, communication and sensing capabilities. These devices interact together to carryout monitoring tasks. An example of such network is a photo-voltaic (PV) power plant where each solar panel has a sensor. The number of interconnected solar panels can become very large, and spread over a large area. Each sensor will sense the output...
With the increase of the number of wireless sensing or metering devices, the collection of sensing data using wireless communication becomes an important part of many applications. Cognitive radio technology can be used to facilitate the deployment of a bandwidth efficient sensor system. In this paper, we propose a data collection and dissemination framework for cognitive radio sensor systems to fully...
As a conventional MAC control protocol for wireless networks, IEEE 802.11 DCF hasn't taken account into the requirement, which TCP/UDP hybrid stream access needs for MAC frame length. The TCP/UDP hybrid stream's transmission delay would increase significantly, that always generate failure of TCP stream transmitting. This paper proposes an improved IEEE 802.11 DCF protocol and theory model based on...
The main function of biomedical sensor network is to guarantee that the data packets from patients can be delivered reliably to the destination node or medical center. Attached to patients, these nodes can be mobile, thus forming a mobile wireless sensor network (mWSN). Moreover, non-cooperative nodes may also be present in the network. This paper therefore proposes a routing method for non-cooperative...
Given the high uncertainty in the dynamics of Wireless Sensor Networks (WSN), it is essential to monitor the Quality-of-Service metrics in order to find the links with poor characteristics. This would allow to implement fault-tolerant protocols to reroute the control packets and avoid zones with untrusted links. However, network monitoring is not used as a permanent analysis tool. This is due both...
Nowadays, due to wide applicability of Wireless Sensor Network (WSN) added by the low cost sensor devices, its popularity among the researchers and industrialists are very much visible. A substantial amount of works can be seen in the literature on WSN which are mainly focused on application specific WSN considering its resource constraints, neglecting the return-of-investment and usefulness of the...
Limited resources in Wireless Sensor Networks (WSNs) are the key concern that needs to be given a careful consideration when studying virtually any aspect of a sensor network. Therefore, energy demands and radio bandwidth utilization should be addressed, especially in one-to-many communication. To define the problem, this article presents and categorizes the most common WSN multicast procedures depending...
Aiming ate the disadvantage of network resource and load balance, this paper analyses the traditional multicast routing protocol base on tree, and then puts forward an improved multicast routing protocol based on network coding and existing distributed shared tree. It adopts minimal link to select the node and puts forward the algorithm of node selecting and shared tree constructing based on network...
The lifetime of wireless sensor networks (WSNs) is an important issue of much recent researches. A practical and widely used approach to prolong the lifetime of WSN is multi-mode protocols in which the sensor nodes are switched between active and sleep modes. But there is no work so far to study the multi-mode structures from reliability viewpoint. In this paper two terminal reliability of WSN is...
In this paper we analyze the importance of packet loss consideration (PLC) within inter node communication of a WSN. We evaluate the link quality between network nodes based on the link packet loss and not on the received signal strength indicator (RSSI). Our assessment is based on in field measurements obtained using the IRIS Crossbow WSN. The measurements are used to show the impact of packet loss...
Vehicular ad hoc networks (VANETs), which are a class of Mobile ad hoc networks, have recently been developed as a standard means of communication among moving vehicles. Congestion is one of the key issues which can restrict the Network performance, and it is no exception for VANETs. Congestion control mechanisms include three phases: congestion detection, congestion notification and rate adjustment...
Wireless Multimedia Sensor Networks (WMSN) are new and emerging networks of wirelessly connected devices, which consist of cameras, microphones, infra-red sensors, scalar sensors and others. These networks are fast gaining popularity due to their potential to be incorporated in various applications, such as, traffic monitoring, border surveillance, smart homes, environment and habitat monitoring,...
In this paper, we investigated the problem of finding an efficient topology for delay-constrained data in WSNs. As we know topology control is one of the important mechanisms designed for decreasing energy consumption in WSNs. Since topology control may increase the end-to-end delay, one of the criteria's should be considered in topology control algorithms is delay constraint. Most existing works...
Transmission of video and imaging data requires both energy and QoS aware routing in order to ensure efficient usage of the sensors and effective access to the gathered information. In large-scale networks with a large number of sensor nodes, multiple sink nodes should be deployed to increase the manageability of the network and also to reduce the energy dissipation at each node. In this paper we...
The delay sensitive industrial control applications like Industrial process control, Environmental control, Gas leakage monitoring, etc. in this a reliable communication between sensor and base station are highly essential. Wireless Sensor Networks (WSN) becomes an immensely popular technology in such application as it offers low latency and high energy-efficiency in message transmission. Life span...
The field of Wireless Sensor Networks (WSN) is undergoing a major revolution, opening the prospect of significant impact in many application areas (safety, health, environment, food safety, manufacturing, telecommunications. Routing isfundamental such a network because there is no infrastructure that manages the information exchanged between network nodes. Two major classes of routing algorithms are...
With the development of wireless sensor networks in industry, it is difficult for MAC protocol with single channel to meet the demands of combating interference, high reliability and low delay. The multichannel MAC protocol is a promising approach to meet these challenges. IEEE 802.15.4 standard is the foundation of ZigBee, WirelessHART and ISA100. This article proposes a multi-channel MAC protocol...
In this paper we address the issues of timeliness and transmission reliability of existing industrial communication standards. We combine a Forward Error Correction coding scheme on the Medium Access Control layer with a lightweight routing protocol to form an IEEE 802.15.4-conformable solution, which can be implemented into already existing hardware without violating the standard. After laying the...
This study investigates a Wi-Fi-based Wireless Networked Control System. This system is first modified in order to enhance resistance to interference. Then, it is subjected to different types of interference. The system consists of a workcell containing 30 sensors, 30 actuators and 1 controller. All forms of interference modeled focus on the operating frequency band used by the control nodes. All...
With Received Signal Strength (RSS) based indoor localization gaining popularity, recent research work has explored many different aspects of such localization systems, for instance, accuracy and deployment cost. In this paper, we study the computational cost of a ratio-based localization algorithm. Specifically, we use the algorithm's inherent distance ratio relationship to refine the physical region...
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