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The normal operation of the equipment in communication room is directly influenced by the temperature. Many communications industries have been concerned greatly about the problem that how to provide an adapt circumstance for the communication room. This system adopts the ZigBee technology, the cluster tree network topology structure, the 2.4GHZ RF wireless transceiver modules of the JN5121, SHT11...
In this paper, a study of the behavior of wireless mesh networks is proposed, by considering energy consumption and reliability of the network. The real consumption with different network topologies and different data profiles will be analized. The objective of this work is to establish the framework to carry out energy optimizations in order to reduce the energy consumption without losing the reliability...
For the sake of overcoming the shortcoming of the wired system such as complex wiring and low anti-interference capacity, a wireless measurement and control system for greenhouse is developed based on Zigbee, which is composed of upper monitor control PC, wireless gateway CC2430, sensor node CC2430 and sensor module. The star network topology is adopted on the basis of studying the characteristic...
Combining with the characteristics of intelligent transportation system and introduces wireless sensor networks technology. This paper illustrates a kind of intelligent transportation system solution of wireless sensor networks based on ZigBee technology. Through the comprehensive analysis of three respects of network topology, energy saving as well as being stable and reliable, this paper brings...
The wireless communication technologies, such as wireless sensor network, can bring great economic benefits to industrial plants. But the open channel and multi-hop network topology will influence its real-time and reliable performance. Funneling effect is a kind of congestion caused by the wireless hop-by-hop and many-to-one networks. IEEE802.15.4 is a wireless personal area network standard that...
Zigbee is a kind of short distance wireless communications technology. The article discussed the technical characteristics, network topology structures and application prospects of ZigBee. And then a scheme on wireless temperature monitoring system based on ZigBee was proposed. The system adopted Star topology structure CC2430 chip of Chipcon Company and 18B20 temperature sensor of MAXIM Company....
IEEE 802.15.4/ZigBee represents set of comercial standards targeted for implementation in low power wireless applications, such as wireless sensor networks. OPENZB model was used for simulation of IEEE 802.15.4 networks using OPNET Modeler. We upgraded this model by adding functionalites which enabled testing this kind of networks under real-world scenarios such as presence of hidden nodes and cluster-tree...
Low power consumption and small footprint make ZigBee based devices well suited for personal healthcare applications, being a promising alternative to general care patient monitoring. However, their use in a healthcare facility to monitor several mobile patients poses several difficulties, mainly because this protocol was primarily designed to operate in low data rate scenarios. This paper introduces...
ZigBee is a low-rate, low-power consumption and low-cost wireless standard. It is suitable for the Home Automation (HA) wireless sensor network (WSN). In this paper, the ZigBee technology is introduced. A Home Automation system based on the CC2430 chip is designed. The structure of the HA WSN system, network topology, design of the hardware and software are also described in the paper. Through the...
As the communication traffic between sensor node and sink node is relatively small, the article puts forward a star topological network based on Wake up On-demand. Based on ZigBee technology, the model employs star topology and STOP mode. The efficiency of the new model is reducing the power consumption of each sensor node and meanwhile lengthening its life-span.
In order to improve the energy efficiency of the fault diagnosis in wireless sensor networks, we propose a tree topology based distributed fault diagnosis algorithm. The algorithm maintains high node fault detection rate and low fault alarm rate in wireless sensor networks under low node distribution density. First, the algorithm finds a good node with a multi-layer detection method, then, detects...
ZigBee is a standard that is suitable for wireless sensor networks. In ZigBee, sensor nodes can be connected by a tree topology called distributed address assignment mechanism (DAAM). It has the merits as follows: 1) it is easy to implement; 2) it simplifies the task of routing. It restricts the number of children and the depth of the network by setting a topological parameter set, which is defined...
The effective coverage range is one of the QoS criterions in wireless sensor network. In practical engineering, the key problem to be solved is how to achieve the effective coverage to enhance performance and lifetime of the whole network. In view of the poor performance of effective coverage in existing ZigBee networks, the paper analysed the factors of impacting on the coverage capability, including...
It has always been a technical challenge for operations service team to expand wireless network reception inside reactor buildings (RB) and their service wings (SW). This is driven by the volume of metal equipment inside the Reactor Buildings (RB) that blocks and somehow shields the signal throughout the link. In this study, to improve wireless reception inside the Reactor Building (RB), an experimental...
Most wireless sensor network deployments are 2-tiered where sensors form the leaves of the network and do not participate in the routing. A plot of the best path from each of the leaves to the sink reveals the network topology to be hierarchical in nature. The AODV routing algorithm was designed for a mesh network with highly mobile nodes and is not directly suitable for a hierarchical sensor network...
This paper concerns multi-hop networks with multiple physical interfaces, and more particularly with multiple radios. For these networks, we investigate the advantage provided by the presence of multiple radios and specifically their impact on metrics such as link connectivity and network diameter and their resilience to link failures, and the length of shortest paths. Our results show that ldquosuper...
Wireless sensor networks have been extensively adopted in numerous application scenarios. However, increasing environmental constraints and performance requirements has spurred the development of tools to expedite deployment and minimize human intervention. This study extends previous work by the authors in network development and aims at the performance evaluation of applications operating in to-be-deployed...
To extend the lifetime of wireless sensor networks a power-aware design of the communication units is required. This can be accomplished by employing power-controllable impulse radio ultra-wideband (IR-UWB) transceivers. In this paper, two distributed power control algorithms are suggested that are based on a variation of IR-UWB specific parameters. The iterative algorithms converge to the optimal...
This paper presents a new concept of MAC and LOAD protocols for IP based ubiquitous healthcare system. The system used IEEE 802.15.4 standard lowpan with integrated IPv6. For healthcare system we added LOAD (6lowpan Ad-hoc on Demand Distance Vector) and MAC (Medium Access Control) protocols in Harvanpsilas 6lowpan stack. 6lowpan stack has ability to connect the physical environment in real-world applications...
In this paper we analyze the node's process of backoff countdown under working at star topology, discuss the access probability and power consume that all probability state of nodes during a superframe. The course of power consume showed that it's not feasible to reduce system power consumption by adjusting the TX power, the only way reducing the nodes in the receiving state and the sparing time to...
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