Relevant bibliographies by topics / ZigBee topology

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'ZigBee topology'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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Journal articles on the topic "ZigBee topology"

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Hamdy, Yehia R., and Ahmed I. Alghannam. "Evaluation of ZigBee Topology Effect on Throughput and End to End Delay Due to Different Transmission Bands for IoT Applications." Journal of communications software and systems 16, no. 3 (2020): 254–59. http://dx.doi.org/10.24138/jcomss.v16i3.975.

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ZigBee is widely used in wireless network in Internet of Things (IoT) applications to remotely sensing and automation due to its unique characteristics compared to other wireless networks. According to ZigBee classification of IEEE 802.15.4 standard, the network consists of four layers. The ZigBee topology is represented in second layer. Furthermore, the ZigBee topology consists of three topologies, star, tree and mesh. Also there are many transmission bands allowed in physical layer, such as 2.4 GHz, 915 MHz, 868 MHz. The aim of this paper is to evaluate the effect of ZigBee topologies on End to End delay and throughput for different transmission bands. Riverbed Modeler is used to simulate multiple ZigBee proposed scenarios and collect the results. The results of the study recommend which topology should be used at each transmission band to provide lowest End to End delay or obtain maximum throughput, which is case sensitive in some IoT applications that required for example minimum delay time or sending high amount of data.
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Hua, Zhu Peng, and Hou Xiao Fang. "The Research and Design on the Monitoring Platform Based on the Internet of Things." Applied Mechanics and Materials 513-517 (February 2014): 2240–43. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.2240.

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Multiple sensors with ZigBee wireless communication module composed of environmental monitoring network platform. With ZigBee server/gateway support, this platform could achieve the connection to the Internet, remote monitor temperature, humidity, smoke, noise, etc. through the Internet network, and achieve ZigBee LAN monitoring and status display. The main contents of this paper are as follows : 1the analysis of ZigBee protocol stack layers of protocol network routing protocols, network topology , etc. 2the research of networking in the form of ZigBee, to build the ZigBee network with a star network topology. 3research ARM platform, understand the Linux operating system, and build embedded Web server. Meanwhile, ZigBee server hardware and software platform is built on this ARM platform, porting ZigBee transceiver modules to realize the ZigBee-based wireless gateway. 4the research of checking buildings , humidity, smoke , noise, heat hydroelectric and other states which need to be monitored remotely through servers.
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Kim, Seong, Jeong Kang, Hong Park, Daeyoung Kim, and Young-joo Kim. "UPnP-ZigBee internetworking architecture mirroring a multi-hop ZigBee network topology." IEEE Transactions on Consumer Electronics 55, no. 3 (2009): 1286–94. http://dx.doi.org/10.1109/tce.2009.5277989.

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Zhao, Dong. "Dual Coordinator Structure for Zigbee Network." Advanced Materials Research 811 (September 2013): 598–601. http://dx.doi.org/10.4028/www.scientific.net/amr.811.598.

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t proposed to set up dual network coordinator to improve the network reliability through the analysis for the Zigbee network topology structure, and then gave the flowchart of the network topology initialization in this paper. The primary and the secondary coordinator mutual backup when initialized.
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Kim, Taehong, Seong Hoon Kim, and Daeyoung Kim. "Distributed Topology Construction in ZigBee Wireless Networks." Wireless Personal Communications 103, no. 3 (2018): 2213–27. http://dx.doi.org/10.1007/s11277-018-5905-0.

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Malek, Al Gabri, Chun Lin Li, Yun Chang Liu, Yan Pei Liu, and Al Museelem Wleed. "Performance Analysis of Improving ZigBee Wireless Network Using AODV Mesh Routing Model." Advanced Materials Research 756-759 (September 2013): 828–32. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.828.

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ZigBee is an emerging standard for the low cost, low power and low rate wireless networks and the ZigBee technology is well suited to a wide range of energy management and efficiency applications in areas such as building automation, industrial, medical and home automation. ZigBee is a version of AODV routing protocol, where the routes are discovered RREQ through the network by the source broadcasting and sending RREP back the destination, so make ZigBee routing efficient, we used AODV mesh topology methods to send and receive data from source to destination and vice versa. In this paper we present an improved version of ZigBee-AODV mesh network, which utilizes and divide the topology of network into one or more logical clusters and restricts the flooding of route request outside the cluster. ZigBee-AODV mesh network uses nodes of the same cluster to share routing information, which significantly reduces the route path discovery and created cluster formation to decrease the routing path. The proposed protocol has higher reliability and lower overhead than AODV.
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Xu, Da Wei, Lei Lei Deng, and Shan Ren. "Design of Home Wireless Network Platform Based on Zigbee." Applied Mechanics and Materials 644-650 (September 2014): 2751–54. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.2751.

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In this paper, a home wireless network platform based on Zigbee technology. This article analyzes the Zigbee network protocol, discusses the key issues to build a home wireless network using the Zigbee technology. The network topology, network routing algorithms and network sampling strategies and other issues were discussed and proposed solutions by building a home wireless network monitoring experiments on the pulse signal. The results showed that based on Zigbee technology to build a home wireless network is feasible, the wireless network in the home monitoring has broad application prospects.
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Wu, Qing Xiu, and Jun Ou. "Research on Wireless Sensor Network Transmission System." Applied Mechanics and Materials 496-500 (January 2014): 2019–22. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.2019.

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In this paper, network layer is based on ZigBee standard. Network establishment and routing of wireless sensor network have been detailed in ZigBee network transmission. It has described data in tree topology and routing in mesh topology network respectively. It has provided with an example. There is no corresponding route in its routing table information, when the source device needs to send a message to the destination device. Source network layer initiates route discovery process. The programming examples are verified on this basis of the theory.
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Yao, Zhen Gang. "A Study on Smart Agricultural Facilities Wireless Networking." Advanced Materials Research 926-930 (May 2014): 2213–16. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.2213.

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A wireless networking method for smart agricultural facilities was proposed in this paper. As ZigBee was a short distance, low complexity, low power cost, low data rate and two-way wireless communication technology, the wireless networking method was based on ZigBee. Network topology, hardware and software were designed in the paper.
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Erazo-Rodas, Mayra, Mary Sandoval-Moreno, Sergio Muñoz-Romero, Mónica Huerta, David Rivas-Lalaleo, and José Rojo-Álvarez. "Multiparametric Monitoring in Equatorian Tomato Greenhouses (II): Energy Consumption Dynamics." Sensors 18, no. 8 (2018): 2556. http://dx.doi.org/10.3390/s18082556.

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Tomato greenhouses are a crucial element in the Equadorian economy. Wireless sensor networks (WSNs) have received much attention in recent years in specialized applications such as precision farming. The energy consumption in WSNs is relevant nowadays for their adequate operation, and attention is being paid to analyzing the affecting factors, energy optimization techniques working on the network hardware or software, and characterizing the consumption in the nodes (especially in the ZigBee standard). However, limited information exists on the analysis of the consumption dynamics in each node, across different network technologies and communication topologies, or on the incidence of data transmission speed. The present study aims to provide a detailed analysis of the dynamics of the energy consumption for tomato greenhouse monitoring in Ecuador, in three types of WSNs, namely, ZigBee with star topology, ZigBee with mesh topology (referred to here as DigiMesh), and WiFi with access point topology. The networks were installed and maintained in operation with a line of sight between nodes and a 2-m length, whereas the energy consumption measurements of each node were acquired and stored in the laboratory. Each experiment was repeated ten times, and consumption measurements were taken every ten milliseconds at a rate of fifty thousand samples for each realization. The dynamics were scrutinized by analyzing the recorded time series using stochastic-process analysis methods, including amplitude probability functions and temporal autocorrelation, as well as bootstrap resampling techniques and representations of various embodiments with the so-called M-mode plots. Our results show that the energy consumption of each network strongly depends on the type of sensors installed in the nodes and on the network topology. Specifically, the CO2 sensor has the highest power consumption because its chemical composition requires preheating to start logging measurements. The ZigBee network is more efficient in energy saving independently of the transmission rate, since the communication modules have lower average consumption in data transmission, in contrast to the DigiMesh network, whose consumption is high due to its topology. Results also show that the average energy consumption in WiFi networks is the highest, given that the coordinator node is a Meshlium™ router with larger energy demand. The transmission duration in the ZigBee network is lower than in the other two networks. In conclusion, the ZigBee network with star topology is the most energy-suitable one when designing wireless monitoring systems in greenhouses. The proposed methodology for consumption dynamics analysis in tomato greenhouse WSNs can be applied to other scenarios where the practical choice of an energy-efficient network is necessary due to energy constrains in the sensor and coordinator nodes.
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Dissertations / Theses on the topic "ZigBee topology"

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Liška, Radovan. "Komunikační technologi ZigBee v automatizaci budov." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-218997.

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Improvement of wireless technologies is a natural consequence of the progress in the field of science and technology. Usage of wireless networks based on the ZigBee technology, which are capable of indepent operation in present form, providing detailed information about physical environment and process management, brings many advantages. On the other hand, there is a serious issue about commissioning. This Master's Thesis deals with introduction of ZigBee technology and its usage, describes issue about device commissioning and types of commissioning. The main part of the Thesis is my own proposal for solving this problem, proposing algorithm using the Bitcloud stack for Coordinator, End Device and Router and its demonstration at the application. Along with analysing the application there are described possible solutions for creating a new network, adding a new node into the existing network and changing a node. The result is a graphical application and firmware for each device. The result of succesfully associated devices in network is supported by the measurement.
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Fuchs, Michal. "Řízení bezdrátové komunikace pomocí ZigBee." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217534.

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The Master’s Thesis deals with a ZigBee technology and its devices working each other in wireless personal area network. The ZigBee and its advantages are compared with other wireless protocols working in ISM bands. A first part deals with a topology of IEEE 802.4.15 WPAN and the ZigBee features. Types and format of the ZigBee data-frame are mentioned. A Second part of this thesis describes a design and testing of the ZigBee devices. Results of this thesis are demonstrated on ZMU (ZigBee Modules Utility) program that has been developed for the testing of this technology.
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Nurubhashu, Mabusubhan Vali. "OPNET Based Design and Performance Evaluation of ZigBee Networks." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1062853/.

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ZigBee is a substandard of IEEE 802.15 family that is specially designed to take care of factors such as power, data rate and area that primarily affect network performance. This has controlling and monitoring capability, which finds potential applications in different sectors. ZigBee allows the concept of hybrid networks and mobility. A comprehensive analysis of ZigBee networks was carried out by constructing and simulating the networks to evaluate the performance in terms of throughput, delay, network load, and packets dropped. This research is aimed at evaluating the effect of network topology on the system performance. A careful review of simulation platforms brought the conclusion of using OPNET Modeler which has the required frame work. Different network topologies of simple and hybrid were built and simulated. Throughout the simulations, the best-case scenarios were drawn to the conclusion by the graphical analysis of parameters of evaluation. Mobile networks were constructed and simulated to investigate the effect of mobility on communication.
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Klíma, Jan. "Bezdrátové komunikační moduly pro mikrokontroléry." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219328.

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The aim of this master’s thesis is analysis of wireless communication between mikroprocesors. The first part of the work are analysed the problems the wireless free ISM band. Mainly RFM12B and ZigBee module, which i these band work and ZigBee standart. The second part are described relazation board for both module. Further how programming ZigBee module. And at last programs for tested module.
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Degirmenci, Cecilia, and Hamed Alsakban. "Laborationer med trådlösa sensornät." Thesis, Malmö högskola, Teknik och samhälle, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-20011.

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Trådlösa sensornät (eng. Wireless Sensor Networks, WSN) är ett snabbt växande teknikområde med många applikationer. Ett typiskt WSN består av en mängd små billiga och energisnåla enheter, så kallade sensornoder, som mäter någon miljöparameter och via radio skickar ett datapaket med uppmätt värde till en basstation som ofta är kopplad till en PC. Informationen kan därefter analyseras eller redovisas grafiskt för användaren. Sensornätverkets storlek kan variera från några få noder på en liten yta till nätverk med tusentals noder som täcker flera kvadratkilometer stora områden. Ett avsnitt om trådlösa sensornät ingår i kursen Data- och telekommunikationsteknik II, DA122T, vid Malmö högskola. Denna rapport presenterar ett examensarbete med att utveckla laborationer och studiematerial om sensornät till kursen.Utrustningen som används i laborationerna är ett paket innehållande sex sensornoder, en basstation och nödvändig programvara. Tillverkare är Crossbow Technology, världens ledande företag inom WSN.Resultatet av arbetet är två laborationshandledningar, beskrivning av utrustning som används i laborationerna samt en rapport – Introduktion till WSN. Handledningarna och det övriga materialet är skrivna på svenska.Den första laborationen, i vilken man bygger ett enkelt WSN, ger studenten förståelse för principen hos trådlösa sensornät och för hur hårdvaran och programvaran samverkar med varandra. I den andra laborationen lär sig studenten programmera sensornoder för att sedan studera kommunikationen mellan noderna och basstationen samt undersöka olika nätverkstopologier.<br>Wireless sensor networks, WSN, is a rapidly growing field of technology with many applications. A typical WSN consists of many small, inexpensive and energy-saving devices, called sensor nodes. These nodes measure an environmental parameter and the radio sends a data packet with the measured value to a base station, which is often connected to a PC. The information can then be analyzed and presented graphically to the user. A sensor network's size can vary from a few nodes in a small area to a network with thousands of nodes that covers several square kilometers of area. A section on wireless sensor networks is part of the course in Computer and telecommunication technologies II, DA122T, at Malmö University. This thesis reports on the development of study material for the practical laboratory motes on sensor networks for the course. The equipment used in the practical experiments is a package containing six sensor nodes, a base station and the necessary software. The manufacturers are Crossbow Technology, the world's leading company of WSN products. The results of the work are two practical exercises, a description of the equipment used in practical experiments and a report – Introduction to WSN. These guides and other materials are written in Swedish. The first lab in which to build a simple WSN, gives students an understanding of the principle of wireless sensor networks and how the hardware and software interacts with each other. In the second exercise, students will learn to program the sensor nodes to study the communication between the nodes and the base station and to explore the different network topologies.
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李稼桐. "Research on Hypercube topology with Zigbee routing technique." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/68550284312576916490.

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You, Chen-yu, and 游承諭. "Investigations of Fast Topology Reconfiguration Scheme for ZigBee Nodes." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/12968672911937992671.

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碩士<br>逢甲大學<br>通訊工程所<br>100<br>It’s a topic that how to maintain the connectivity and to extend the live time in a mobile network. In this study, we modify the association process in IEEE 802.15.4 to reduce the time cost in mobile nodes associating with the coordinator in a network. Our method can achieve a faster configuration time with an existing network and also enhance the average efficiency of networks. We tested it in many different environments to obtain more accurate data. We use NS2 simulation software to perform analysies and tests. In our simulation, we build mobile nodes in a test region then we simulate situations where nodes are still or roaming and increasing traffic flows for different number of nodes. The average time that each node associated with the coordinator is calculated, and we obtain the average time for different number of nodes. Our results are compared with IEEE 802.15.4 standard to confirm the efficiency of the scheme which can extend average live time of a network.
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Cheng, Yi-Ching, and 鄭一慶. "Energy Aware Topology Construction and Scheduling for ZigBee Wireless Networks." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/89498461652819994172.

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碩士<br>淡江大學<br>資訊工程學系碩士在職專班<br>101<br>ZigBee is a new wireless standard that adheres to the regulations defined in IEEE802.15.4 during the development of short-distance transmission technology. The product appeal uses short-distance transmission, energy saving, small size, low costs, easy development, capability to support large number of transmission points, and low rate data transfer characteristics to satisfy broad user requirements. Currently, ZigBee is used in products in the fields of consumer electronics, short-distance commu-nication services, energy efficiency and management, medical care, home utility monitoring, high rise management automation, automated industrial production, indoor positioning, animal tracking, elec-tro-mechanical control, and lighting system management. Energy saving mechanisms have been popular research topics in recent years because of the need to achieve long-term use of ZigBee equipment. In a ZigBee network, the use of default network link mode has causes certain nodes to bear most of the data transfer load after the formation of the network. This phenomenon caused these nodes to rapidly consume electrical power. This paper uses electricity-awareness concepts to establish a network topology with electricity-awareness, achieve selection and allocation between child nodes, and extend the life of the entire network.
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Lin, Yeh-Wei, and 林業偉. "Design and Implementation of Smart Home Based on ZigBee with Mesh Topology." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/n5r2bu.

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碩士<br>國立虎尾科技大學<br>電機工程研究所<br>102<br>In this thesis, we propose based on ZigBee Wireless Sensor Networks (WSNs) technology of Smart-Home system and also achieve the Mesh topology architecture to improve Life Cycle Assessment problem. Each sensing area use different Router to avoid routing failure problems. In smart home system, we use sensor and sensing data send to corresponds to the function of the device to achieve context aware. Therefore, when the room has a condition which the phone will alert the user to achieve real-time monitoring. The system provided monitoring system in the House. The monitor system is use NDK and SDK to write application interface for Android mobile phones. In this system, we provided queries of smart sensing inquiry and queries of node status inquiry. We use Mesh topology architecture to achieve robust data transmission and upgrade packet delivery ratio (PDR). In the future, we will combine wireless sensor network physical devices to improve system range of applications, combined with a variety of sensors and microcontrollers, to enhance the system''s utility value. In addition to smart home system provides users to view, you can also add remote monitoring capabilities, users can enhance the quality of life, and can effectively use the limited energy and reach energy efficiency goals.
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Jheng, Chong-Ting, and 鄭崇廷. "A New ZigBee Positioning System with Cellular Topology Used for Large Size Areas." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/8nntub.

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碩士<br>國立虎尾科技大學<br>電機工程系碩士班<br>104<br>We proposed a new positioning scheme with ZigBee technology for the indoor environments. The received signal strength Indicator (RSSI) of reference nodes measured of the target are used to estimate the distances between the target and reference nodes. For each specific environment, we need to establish its channel model (the relation between the distance and RSSI). Because of the nonlinear relation, the estimation error of distance becomes larger as the corresponding RSSI is smaller. Therefore, we classify the error to two levels: valid and invalid distance ranges. Accordingly a trilateral positioning method with an optimized positioning geometry is proposed by exploiting the valid distance range. The optimized geometry is a regular triangle with the side length to be set up to the maximum valid distance range. As a result, a target node could receive more accurate the RSSI from each reference node, and thus the positioning area is enlarged. In order to verify our method, we perform a positioning experiment by comparing two different triangle geometries of same area. In addition we also consider the isosceles triangle with a longest side length up to the invalid distance range. The experimental results reveal that the average estimation error of distances is 27cm and its standard deviation is 12cm for the regular triangle. The isosceles triangle produces an average error of 61cm and standard deviation of 57cm. Thus, the trilateral positioning method with an optimized regular triangle geometry has an excellent positioning performance. In order to enlarge the positioning area, we further propose a hexagonal positioning geometry by combining six regular triangles as mentioned above. However a new problem occurs when a target node located around the boundary area of any two adjacent regular triangles. The target node is likely to choose a wrong triangle in which the target node is not located. This results in the increase of estimation error of distance. Therefore, we propose a new dynamic hybrid trilateral positioning method for the hexagonal positioning geometry to reduce the estimated error. According to our experiments, by the proposed method, the average estimation error of distance is reduced from 211cm to 29cm and the standard deviation from 237cm to 13cm. Moreover, if the considered area is much larger than that of the hexagonal geometry, we can combine the different hexagonal geometries to form a cellular topology, which produces an extended area. The target node receives the 7 highest RSSI values of reference nodes to create a hexagonal positioning geometry. It is shown that the proposed new ZigBee positioning system with cellular topology that is suitable to be used for any size of positioning coverage.
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Book chapters on the topic "ZigBee topology"

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Ouadou, Mourad, Ouadoudi Zytoune, Yassin El Hillali, Atika Menhaj-Rivenq, and Driss Aboutajdine. "Minimum Spanning Tree Topology in Real Zigbee-Arduino Sensor Network." In Ad Hoc Networks. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-25067-0_5.

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Li, Saichao, and Jiasong Mu. "Performance Analysis for the Improved Topology Updating Mechanism for ZigBee Networks in 5G." In Lecture Notes in Electrical Engineering. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3229-5_32.

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Fernández-López, Helena, Pedro Macedo, José A. Afonso, J. H. Correia, and Ricardo Simões. "Evaluation of the Impact of the Topology and Hidden Nodes in the Performance of a ZigBee Network." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11528-8_18.

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Lin, Zhicheng, Pui-In Mak, and Rui Paulo Martins. "A 2.4-GHz ZigBee Receiver Exploiting an RF-to-BB-Current-Reuse Blixer + Hybrid Filter Topology in 65-nm CMOS." In Analog Circuits and Signal Processing. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21524-2_3.

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Conference papers on the topic "ZigBee topology"

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Kumar, Tinku, and P. B. Mane. "ZigBee topology: A survey." In 2016 International Conference on Control, Instrumentation, Communication and Computational Technologies (ICCICCT). IEEE, 2016. http://dx.doi.org/10.1109/iccicct.2016.7987937.

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Dimou, Maria, Theofilos Kossyvakis, Costas Chaikalis, Konstantinos P. Tsoukatos, Charalampos Liolios, and Vasileios Vlachos. "Topology Experimentation in a Zigbee Wireless Sensor Network." In PCI '16: 20th Pan-Hellenic Conference on Informatics. ACM, 2016. http://dx.doi.org/10.1145/3003733.3003772.

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Kaur, Amritpal, Jaswinder Kaur, and Gurjeevan Singh. "An efficient hybrid topology construction in Zigbee sensor network." In 2014 Recent Advances and Innovations in Engineering (ICRAIE). IEEE, 2014. http://dx.doi.org/10.1109/icraie.2014.6909171.

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Torres, Victor, Jorge Becerra, Fermin Esparza, Antonio Lopez, and Francisco Falcone. "Analysis of topology considerations in indoor ZigBee meshed networks." In 2010 53rd IEEE International Midwest Symposium on Circuits and Systems (MWSCAS). IEEE, 2010. http://dx.doi.org/10.1109/mwscas.2010.5548841.

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Liu, Dan, and Hong Yu. "An efficient improvement approach for topology formation in ZigBee network." In 2012 World Congress on Information and Communication Technologies (WICT). IEEE, 2012. http://dx.doi.org/10.1109/wict.2012.6409236.

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Pavkovic, Bogdan, Natasa Matic, Dorde Glisic, Lazar Berbakov, and Istvan Pap. "Simple detection of network anomalies and topology control in ZigBee networks." In 2017 25th Telecommunication Forum (TELFOR). IEEE, 2017. http://dx.doi.org/10.1109/telfor.2017.8249346.

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Zhang, Chenyan, and Wenguang Luo. "Topology Performance Analysis of Zigbee Network in the Smart Home Environment." In 2013 5th International Conference on Intelligent Human-Machine Systems and Cybernetics (IHMSC). IEEE, 2013. http://dx.doi.org/10.1109/ihmsc.2013.251.

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Shrestha, Pradhumna Lal, Michael Hempel, Sushanta Rakshit, Hamid Sharif, John Punwani, and Monique Stewart. "Performance Evaluation of Hybrid Technology Networking for Real-Time Monitoring in Freight Railroad Operations." In 2013 Joint Rail Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/jrc2013-2467.

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Traditional Wireless Sensor Network (WSN) solutions have been deemed insufficient to address the requirements of freight railroad companies to implement real-time monitoring and control of their trains, tracks and wayside equipment. With only ZigBee-based elements, the transmission capabilities of WSN devices are limited in terms of coverage range and throughput. This leads to severe delay and congestion in the network, particularly in railroad scenarios that usually require the nodes to be arranged in linear chain-like topology. In such a multi-hop topology to communicate from one end of a train to the locomotive — and due to ZigBee’s limited communication range — data needs to be transmitted using a very high number of hops and thus generates long delays and congestion problems. To overcome this drawback, we have proposed a heterogeneous multi-hop networking approach called “Hybrid Technology Networking” (HTN). In HTN we combined Wireless Local Area Network (WLAN) technologies like WiFi, which provide improved communication range and higher data rates, with low-power communication technologies like ZigBee. This significantly reduces the number of hops required to deliver data across the network and hence solves the issues of delay and congestion, while also achieving superior enery efficiency and network lifetime. The sensor nodes are logically divided into clusters and each cluster has a WiFi “gateway”. All intra-cluster communication is achieved via IEEE 802.15.4 and ZigBee protocols, while all inter-cluster communication utilizes WiFi protocol standards. To implement our proposed technology in railroad networks, we are designing hardware prototypes and simulation models to evaluate the functionality and performance of our HTN solution, which is designed around a dual network stack design governed by the HTN protocol. This ensures full compliance with IEEE and industry communication protocols for interoperability. Since no simulation tools that seamlessly combine both WSN and WLAN technologies in a single module exist, we wrote our own simulation environment using OPNET. In this paper, we have provided information of implementing the HTN protocol in OPNET and the simulation results for different scenarios relevant to railroad operations. These results will demonstrate the efficacy of our proposed system as well as provide the baseline data for testing the hardware devices in live networks. Under simulated traffic and channel conditions and device configurations, we observed a decrease of 77.27% in end-to-end delay and an increase of 69.70% in received data volume when using HTN compared to ZigBee-only multi-hop networks, simulated over 14 railcars in railroad-relevant scenarios.
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Oh, Sechang, Hyeokjun Kwon, and Vijay K. Varadan. "Wireless telemedicine systems for diagnosing sleep disorders with Zigbee star network topology." In SPIE Nanosystems in Engineering + Medicine, edited by Sang H. Choi, Jin-Ho Choy, Uhn Lee, and Vijay K. Varadan. SPIE, 2012. http://dx.doi.org/10.1117/12.946115.

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10

Horng, Mong-Fong, Jung-Yi Jiang, Kuan-Rong Lee, Yan-Cheng Lee, and Chih-Chiu Shieh. "An improved binary tree topology for ZigBee networks for high efficiency network addressing." In 2013 International Conference on Machine Learning and Cybernetics (ICMLC). IEEE, 2013. http://dx.doi.org/10.1109/icmlc.2013.6890764.

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