Houssem R. E. H. Bouchekara (17743281), Abdulazeez F. Salami (17743284), Yusuf A. Sha’aban (16052906) et al. · Figshare · 2024
<div><p>This paper is a follow-up to a recent work by the authors on recoverable UAV-based energy-efficient reconfigurable routing (RUBER) scheme for addressing sensor node and route failure issues in smart wireless livestock sensor networks. Time complexity and processing cost issues connected to the RUBER scheme are consequently treated in this article by proffering a time-aware UAV-based energy-efficient reconfigurable routing (TUBER) scheme. TUBER scheme employs a synchronized clustering-with-backup strategy, a minimum-hop neighborhood recovery mechanism, and a redundancy minimization technique. Comparative network performance of TUBER was investigated and evaluated with respect to RUBER and UAV-based energy-efficient reconfigurable routing (UBER) schemes. The metrics adopted for this comparative performance analysis are Cluster Survival Ratio (CSR), Network Stability (NST), Energy Dissipation Ratio (EDR), Network Coverage (COV), Packet Delivery Ratio (PDR), Fault Tolerance Index (FTI), Load Balancing Ratio (LBR), Routing Overhead (ROH), Average Routing Delay (ARD), Failure Detection Ratio (FDR), and Failure Recovery Ratio (FRR). With reference to best-obtained values, TUBER demonstrated improvements of 36.25%, 24.81%, 34.53%, 15.65%, 38.32%, 61.07%, 31.66%, 63.20%, 68.96%, 66.19%, and 78.63% over RUBER and UBER in terms of CSR, NST, EDR, COV, PDR, FTI, LBR, ROH, ARD, FDR, and FRR, respectively. These experimental results confirmed the relative effectiveness of TUBER against the compared routing schemes.</p></div>
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Unzeitig, Lubomír · Brno University of Technology Digital Library (Brno University of Technology) · 2008
Tato práce se zabývá šířením mobilního signálu ve formě elektromagnetické vlny v reálném prostředí městské mikrobuňky. Elektromagnetická vlna je průchodem městským prostředím ovlivňována řadou mechanizmů. Patří mezi ně především difrakce kolem vertikálních hran budov, difrakce o střechy a refrakce nebo rozptyl od stěn budov popř. země. Tyto mechanizmy jsou časově velmi proměnné. Pokud je chceme predikovat, musíme použít více či méně aproximovaný model. Pro experimentální část této práce je zvolen Bergův rekurzivní model, který je schopen predikovat střední hodnotu ztrát šířením resp. střední hodnotu výkonu signálu v daném mikrobuňkovém prostředí. Na jeho základě je vytvořen program umožňující výpočet pokrytí území buňkové sítě signálem. Jeho výhodou je možnost rozmístění až pěti základnových stanic a nastavení řady parametrů jako jsou pracovní frekvence, vysílací výkon základnové stanice, výšky antén základnové a mobilní stanice atd. Samozřejmostí je možnost volby systému GSM 900, GSM 1800 nebo UMTS. Vlastnosti použitého Bergova rekurzivního modelu jsou ověřeny simulacemi na pokusných i reálných mapách městské zástavby.
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Isiaka A. Alimi · Synthesis lectures on communications · 2025
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Štrajt, Martin · Brno University of Technology Digital Library (Brno University of Technology) · 2018
The primary focus of my project is a long-range low-power communication technology called LoRaWAN. It contains the definition and integration of Low Power WAN Networks and also lists of some uses and some examples of representative. The theoretical part explains in detail the used modulation, frequency and associated limitations. The practical part includes simulation of coverage with a description of the simulation method and the last chapter of the measurement, which describes the description of the measuring device, the measurement methodology and a brief outline of the connection the device to the network.
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Charles H. Lee, Kar‐Ming Cheung · 57th International Astronautical Congress · 2006
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Faqih Rofii · OSF Preprints (OSF Preprints) · 2018
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Bo ZHENG, Hengyang ZHANG, Yong LI et al. · SHILAP Revista de lepidopterología · 2018
The high-altitude long-durance unmanned aerial vehicle (HALE-UAV) equipped with directional antenna and the cuboid-shaped air corridor (AC) were taken as the study objects,and the basic idea was to extract the invariant coverage area of moving spherical cones,cylinder,as the basic component to fill AC.The general goal was to employ HALE-UAV as few as possible under the condition that the height of the cylinder was larger than that of AC.The circular and triangular orbits of HALE-UAV were analyzed in geometry respectively,and the mathematical expressions of the radius and height of the cylinder were derived.Then two coverage schemes were introduced.Through comparing the two schemes by optimization theory,the optimal coverage strategy was derived.Results show that the circular orbit is better than the triangular orbit.Moreover,the optimal solution is to employ the quasi-static floating platforms,and the suboptimal is to adopt the circular orbit of a small radius,or the triangular orbit of a small side,with a HALE-UAV on an orbit.
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Ryan M. Ames (409738), Jamie I. MacPherson (199655), John W. Pinney (7698) et al. · Figshare · 2015
a<p>HT refers to enriched terms found in subgraphs from the high-throughput PPI network.</p>
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P. Kuonen, S. Josselin, D. Wagner et al. · 1995
This paper reports an experiment of such a network within PVM framework in the telecommunications field. In TDF-C2R a windows-based software has been developped for digital TV network coverage simulation. But simulation is strongly limited for large planning exercices because of computing time needed. For example, the exercice over 6400km
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Stéphane Ubéda, S. Josselin, Daniel Wägner et al. · HAL (Le Centre pour la Communication Scientifique Directe) · 1995
International audience
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Fangxia Zhao (3178545), Huijun Sun (2351530), Jianjun Wu (276191) et al. · Figshare · 2016
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Fu Yanbo · Wireless Communication Technology · 2018
The trend of mobile, broadband and IP is becoming more and more prominent. Mobile communication technology is now in acritical period in the evolution of network technology. As such, LTE (Long Term Evolution) comes to light. LTE serves as a unified standardfor the new generation of mobile communications, equipped with high spectral efficiency, high peak rate, high mobility, flat networkarchitecture and other advantages. Huawei has played a very important role in the commercialization of LTE. As a sponsor of NGMN,Huawei has been actively involved in the research of some key projects of NGMN, such as network self-optimization, system architectureand Network performance evaluation and so on. This paper mainly introduces the problems encountered in the optimization of LTEnetwork coverage, the practical problems encountered by the LTE project team in Qingdao and the analysis and solutions to the problems.At the same time, this paper discusses in detail on the LTE network optimization process.
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Dina Šimunić, K. Tolic, Daniel Mo · 2004
Detailed coverage and capacity planning is of great importance when planning and designing a wideband code division multiple access (WCDMA) system. Using simulation software developed for educational purposes, we have calculated WCDMA FDD network basic coverage and the dependence on cell loading and on the service used. We present the results obtained.
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Gregory Vey (144622), Gabriel Moreno-Hagelsieb (578) · Figshare · 2015
<p>Four polyketide target perspective networks were constructed with progressively increasing target stringency and each network was translated into each of the four annotation categories. The proportion of nodes and edges in each polyketide network was compared to its corresponding overall network. Panel A shows that coverage for nodes decreased for all annotation categories with increasing target stringency and Panel B shows that coverage for edges also decreased for all annotation categories with increasing target stringency.</p>
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fabian perez · Bulletin of Miscellaneous Information (Royal Gardens Kew) · 2023
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Xieyang Xu, Ryan Beckett, Karthick Jayaraman et al. · 2021
Testing and verification have emerged as key tools in the battle to improve the reliability of networks and the services they provide. However, the success of even the best technology of this sort is limited by how effectively it is applied, and in today's enormously complex industrial networks, it is surprisingly easy to overlook particular interfaces, routes, or flows when creating a test suite. Moreover, network engineers, unlike their software counterparts, have no help to battle this problem—there are no metrics or systems to compute the quality of their test suites or the extent to which their networks have been verified.
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Hasib, Jaseem, Ozeni, Ken, Cove, Steven William · Digital WPI · 2000
The project team did research on the Global Standard for Mobile communications system, as well as cellular coverage prediction models at Tele Danmark A/S. The team integrated a Nokia phone, a laptop and a measuring wheel to collect data on radio signal propagation. Another program, consisting of the Nokia phone and a GPS receiver was developed to display data in real time. After the analysis of the collected data, the team developed a model based upon research and measured data.
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Maria-Jesus Pinazo (3490514), Mirko Rojas-Cortez (3490517), Ruth Saravia (4376545) et al. · Figshare · 2022
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Sai Zhang, Cihan Tepedelenlioglu, Andreas Spanias et al. · Synthesis lectures on communications · 2018
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Amitkumar Dudhat, Tatik Mariyanti · International Journal of Cyber and IT Service Management · 2022
The presence of interference has a significant impact on wireless network connections indoors. Because of the effects of multipath propagation, such as reflection, refraction, and scattering of radio waves by the structure of the building, the sent signal can usually be received in free space or via more than one pathway, and the consequence might be a phenomenon known as multipath fading. For different results, propagation models have been identified, which provide the propagation features of the initial evaluation. There are two types of wireless propagation models: empirical and theoretical models that deal with coverage, overlapping channels, and wireless network performance. The planning system was set out using a practical and theoretical approach. Furthermore, this comparison may aid in determining the accuracy of survey measures in the context of indoor wireless monitoring and provide an estimate of the breadth and performance of wireless networks in the form of a new topology with contour presentation. Layout plan optimization The typical RSSI of a Wi-Fi system ranges from -40 dBm to -55 Dbm, with a power of 17-18 Dbm, and is applied to channels 1 through 11 non-overlapping in the design of networks with multiple APs that are nearby. The new topology represents the optimization outcomes, accompanied by a contour display and dispersed over the region.
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