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Wireless Industrial Automation Networks may comprise large number of sensors and actuators which are densely deployed in various parts of an industry to monitor and control physical parameters like pressure, temperature, humidity, flow, level, density etc.by utilizing IEEE 802.15.4 standard. Typically, a sensor node consists of sensing subsystem for data acquisition, processing subsystem for data...
This paper investigates the best way for representing wireless sensor networks using various topologies of ZigBee. The use of coordination with such networks was investigated together with coordinator load. The investigation has been achieved via the use of different scenarios in the OPNET Modeler simulator. The simulation study investigates the use of coordination with star routing, mesh routing...
In these years, disasters often occurred in Japan and abroad. When the disaster happen, general communication methods, e.g., cell phone, may not work well due to the damage of communication infrastructure or restriction of usage of communication resources. How to let users quickly confirm safety is a critically important problem after a disaster. Therefore, we propose a design of safety confirmation...
With the growing interest in various wireless networks, the need for seamless connection and interoperability of heterogeneous wireless networks is becoming increasingly important. In this research, we focus on deploying the heterogeneous wireless networks, which consists of Wi-Fi networks and ZigBee networks. In heterogeneous wireless networks, data communication between pair of a sensor node and...
When the topology is mesh in ZigBee network, by changing the communication radius of the node, simulation result proves that the different effective communication distance of signal has a great influence on the network performance, meanwhile, the different values of key parameters MY_ROUTE_TIMEOUT and ACTIVE_ROUTE_TIMEOUT also cause some effect to the network performance. Through summarizing the simulation...
ZACA-EEC (Zigbee Ant Colony Algorithm Energy Efficient Cluster) routing protocol is proposed to replace AODV in Zigbee with the aim of increasing reliability for mine equipment monitoring in this paper, which can prolong the lifetime of network remarkably. Taking hydraulic support as an example, the distribution of monitoring nodes can be simplified as chain hierarchy topology, then Free-space model...
Wireless Sensor Networks (WSNs) is an emerging field of engineering with various applications. They have emerged as a new class of large scale networks of embedded systems with limited communication, computation and energy resources. Recently adopted IEEE 802.15.4 standards for Low-rate Wireless Personal Area Network (LR-WPAN) are most extensively used communication platform for WSNs. Conventional...
Problems of Wireless Sensor Networks (WSN) caused in the laboratory are predictable, and easy to resolve. While in the deployment and management phases, a number of factors in the environment raise more problems that are difficult to predict or simulation than in laboratory condition. To effective manage and monitor those problems, an effective management mechanism is needed, which analysis the problems...
This paper proposes an improved Ad-hoc On-Demand Distance Vector (AODV) routing protocol based on node-grade to reduce the energy consumption of nodes in wireless sensor networks. The improved AODV called Grade-AODV (G-AODV) assigns a grade to each node according to the hop distance of the node to the sink node. The lower grade a node has, the closer it is to the sink. Each node is restricted to receive...
In this paper, we propose a method to save energy consumption for the rejoin procedure of ZigBee networks. By skipping the active scan process, a rejoining node and its neighbors are able to save a large amount of energy. In addition, the rejoining node chooses the suitable potential parent by reserving and utilizing original neighbor table. This method is capable of reducing the number of rejoin...
ZigBee low power wireless networks, as the fittest plane for WSN in existing, are paid attention to increasing by people. In this paper, we present the topology of tree cluster network, by analyzing the algorithm for routing we propose a method that the first receiving are the best route to implement message routing. To demonstrate its effectiveness, we form a tree cluster network and validate process...
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