Bibliographies thématiques / Moving base station

Littérature scientifique sur le sujet « Moving base station »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "Moving base station"

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SUKACHEV, E. A. « THE DYNAMICS OF THE INTERFERENCE SITUATION IN THE DOWNLINK DIRECTION OF THE MOBILE COMMUNICATION NETWORK WITH CDMA TECHNOLOGY ». Digital Technologies 26 (2019) : 61–68. http://dx.doi.org/10.33243/2313-7010-26-61-68.

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The work is devoted to the investigation of inter-cell interference in the radio access network, provided that subscribers are moving in cells along the route indicated earlier. Very often, the trajectory of the movement of mobile stations coincides with the grid of city streets, where subscribers are moving in public transport. For a network where the cluster dimension is K = 1, the proposed methodology for studying changes in the level of intra-system interference at the input of the receiver of a mobile station when a subscriber is moving along the given path. The features of the situation where the control mode of the transmitter power of the base station is used in each cell, which provides a constant power level of the input signal when the subscriber is moving within the cell, are analyzed. The level of inter-cell interference is estimated as one of the factors on which the quality of services depends, namely, the signal-to-interference ratio at the input of the receiver of the mobile station. For specific trajectories of the movement of subscribers in neighboring cells, a law of changing the transmitter power of the base station was found, which interferes with the receiver of the mobile station in the neighboring cell. Estimated ratios are obtained for determining the level of interference when subscribers in neighboring cells are moving along parallel streets. This assessment of the dependence of the signal / interference ratio at the input of the subscriber's receiver on the speed and direction of its movement. This dependence shows that serious problems with the quality of service provided by the operator will not arise. Such an investigation allows modeling the cellular network in order to optimize the work on improving the services provided to mobile subscribers.
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Wang, James Z., Zhidian Du et Pradip K. Srimani. « Cooperative Proxy Caching for Wireless Base Stations ». Mobile Information Systems 3, no 1 (2007) : 1–18. http://dx.doi.org/10.1155/2007/371572.

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This paper proposes a mobile cache model to facilitate the cooperative proxy caching in wireless base stations. This mobile cache model uses a network cache line to record the caching state information about a web document for effective data search and cache space management. Based on the proposed mobile cache model, a P2P cooperative proxy caching scheme is proposed to use a self-configured and self-managed virtual proxy graph (VPG), independent of the underlying wireless network structure and adaptive to the network and geographic environment changes, to achieve efficient data search, data cache and date replication. Based on demand, the aggregate effect of data caching, searching and replicating actions by individual proxy servers automatically migrates the cached web documents closer to the interested clients. In addition, a cache line migration (CLM) strategy is proposed to flow and replicate the heads of network cache lines of web documents associated with a moving mobile host to the new base station during the mobile host handoff. These replicated cache line heads provide direct links to the cached web documents accessed by the moving mobile hosts in the previous base station, thus improving the mobile web caching performance. Performance studies have shown that the proposed P2P cooperative proxy caching schemes significantly outperform existing caching schemes.
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LUZHANSKY, V., L. V. KARPOVA et A. POVKH. « INVESTIGATION OF SIGNAL DISTURBANCE OF THE SIGNAL AT THE INPUT OF THE MOBILE STATION RECEIVER WITH DIFFERENT CHARACTERISTICS OF BASE STATIONS IN THE CONDITIONS OF CITY BUILDING ». HERALD OF KHMELNYTSKYI NATIONAL UNIVERSITY 295, no 2 (mai 2021) : 206–13. http://dx.doi.org/10.31891/2307-5732-2021-295-2-206-213.

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The purpose of the scientific paper is to study the effects of internal system interference caused by the movement of a mobile station in the cell of the service area, which involves the use of the same frequencies, which worsens the communication conditions. The article provides calculation formulas for determining the signal-to-noise ratio at the input of the receiver of the mobile station. Calculations, including tables and figures, for different characteristics of base stations (BS) of the mobile network are also given. The analysis of literature sources shows insufficient depth of the conducted researches in directions for improving the noise immunity of the signal under different conditions in particular: city development, terrain, interference from other base stations. The use of radio networks with moving objects makes it possible to repeatedly use the same dedicated frequency band to increase the speed of digital information transmission and economical use of the frequency range. This method has a significant disadvantage, which is the presence of mutual internal system interference between base and mobile stations that use the same frequency range. The purpose of the scientific article is to study the noise immunity of the signal at the input of the receiver of the mobile station at different characteristics of the base stations in terms of urban development
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Le, Zichun, Xianyu Zeng et Minglei Fu. « Optimized Base Station Location Planning for Indoor Positioning in Visible Light Communication System ». Journal of Optical Communications 39, no 4 (25 octobre 2018) : 437–47. http://dx.doi.org/10.1515/joc-2017-0004.

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Abstract Visible light communication (VLC) is an emerging optical communication technology, and indoor positioning of moving target devices is one of most important issues in the VLC system. In this study, we focused on LED base station location planning to improve the accuracy of the positioning method based on the received signal strength intensity (RSS) and the Kalman filter (KF). We developed a new base station location-planning scheme called equilateral triangle distribution. We proved theoretically that the equilateral triangle distribution scheme reduced the positioning error area when compared with the rectangular distribution scheme. The simulation results showed that the measuring error of the equilateral triangle distribution method using KF was less than 5 cm, even when the receiver was located at the boundary of the room. Our method verified that the VLC indoor positioning accuracy can be improved when LED base stations are distributed according to our equilateral triangle distribution scheme.
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Wu, Yuzhan, Susheng Ding, Yuanhao Ding et Meng Li. « UWB Base Station Cluster Localization for Unmanned Ground Vehicle Guidance ». Mathematical Problems in Engineering 2021 (22 avril 2021) : 1–23. http://dx.doi.org/10.1155/2021/6639574.

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In this paper, we seek to provide unmanned ground vehicles with positioning service using ultrawideband (UWB) technology, a high-accuracy positioning approach. UWB is chosen for two distinct reasons. First, it does not rely on global navigation satellite systems like GPS, making it able to be applied indoors or in an environment where GPS signal is unstable. Second, it is immune to interference from other signals and accurate enough to guide unmanned ground vehicles moving precisely in a complex environment within a narrow road. In this paper, three UWB base stations are aggregated as a group in a 2D space for localization. A large number of tests are performed with a UWB base station cluster in order to validate its positioning performance. Based on the experiment results, we further develop a dynamic particle swarm optimization-based algorithm and a genetic algorithm to deploy multiple clusters of UWB base stations to cover an area of interest. The performance of the proposed algorithms has been tested through a series of simulations. Finally, experiments using unmanned ground vehicles are carried out to validate the localization performance. The results confirm that the robots can follow complex paths accurately with the proposed UWB-based positioning system.
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Mitić, Dragan, Aleksandar Lebl, Branimir Trenkić et Žarko Markov. « How users' moving in a cell affects the necessary base station power ». Tehnika 74, no 2 (2019) : 245–50. http://dx.doi.org/10.5937/tehnika1902245m.

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Enayati, Saeede, Hamid Saeedi, Hossein Pishro-Nik et Halim Yanikomeroglu. « Moving Aerial Base Station Networks : A Stochastic Geometry Analysis and Design Perspective ». IEEE Transactions on Wireless Communications 18, no 6 (juin 2019) : 2977–88. http://dx.doi.org/10.1109/twc.2019.2907849.

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Rodimtsev, Sergey, Alexander Psaryov et Andrey Chuykin. « Monitoring of moving objects in the absence of a GSM signal ». MATEC Web of Conferences 341 (2021) : 00029. http://dx.doi.org/10.1051/matecconf/202134100029.

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Many modern transport processes require constant on-line monitoring and management. However, the main difficulty lies in the lack of a stable GSM connection. One of the possible solutions to this issue is the use of MESH networks. These represent the possibility of wireless communication between multiple entities, which are nodes on a distributed network. The article presents the results of the development of original local radio modules and a base station to ensure uninterrupted transmission of digital data from the monitoring object, in conditions of insufficient GSM coverage. The complex provides the following operating modes: simple interaction via a GSM channel, data transmission via a self-organizing network, as well as sensory interaction between objects. In the absence of GSM communication, the repeater provides on-line data transmission from the monitoring object, at a distance of up to 860 m, at a distance from the base station - at least 500 m. The use of the new complex makes it possible to promptly respond to changes in operating factors and prevent emergency situations during the operation of vehicles.
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Do, Dinh-Thuan, Thanh-Luan Nguyen et Byung Moo Lee. « Transmit Antenna Selection Schemes for NOMA with Randomly Moving Interferers in Interference-Limited Environment ». Electronics 9, no 1 (27 décembre 2019) : 36. http://dx.doi.org/10.3390/electronics9010036.

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In this paper, non-orthogonal multiple access (NOMA) is studied at downlink under impact of surrounding interference. This study benefits the practical NOMA system since spatially random interference is adopted. More specifically, we consider the antenna selection strategy applied at the base station and compare the performance of two users. By applying a stochastic geometry-based model, homogeneous Poisson point process (PPP) is employed to consider the spatial topology of interference which is located near to users, and such a model is extremely suitable for practical consideration. We first consider outage probability and then ergodic capacity is examined as main metrics to recommend such model in practice. According to the considered antenna section scheme of the base station, we compare these schemes related to selected antenna serving each user. To confirm exactness of derived expressions, we perform Monte Carlo simulations to verify the analytical results.
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Rode, Henryk. « A research station with a two-disc cutting unit for studying the cutting process of energy ». E3S Web of Conferences 46 (2018) : 00001. http://dx.doi.org/10.1051/e3sconf/20184600001.

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The paper presents the construction of a new research station for studying the cutting process of energy plants. The station consists of 3 basic units: a truck with drive and cutting units, a frame which is a guide for the truck moving on it, and a base for placing the plant’s stems. The station allows to determine the unitary energy of the cutting process for various rotary and travelling speeds of the cutting unit and for various sizes, spacing and angles of inclination of the cutting discs. It also allows to form freely the cut plants’ stems’ sockets.
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Thèses sur le sujet "Moving base station"

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MOHAMMADNIA, FOROOGH. « Adaptive Network Densification with Small Cell Mobile Base Stations Carried by Vehicles ». Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2850602.

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Shen, Wei-Chen, et 沈韋呈. « A Study of Passenger's Moving Conflict to Ameliorate Flow by Simulation- Based Evaluation in MRT Taipei Main Station ». Thesis, 2011. http://ndltd.ncl.edu.tw/handle/22300739458015658027.

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碩士
中國文化大學
建築及都市設計學系
99
As an important space in a rapid transit system, the MRT station usually has an influx of passengers in rush hour. Public transit could not provide the service as private vehicle which we called "Door to Door", the overall quality of service and transit efficiency are deeply affected by moving line configuration and well-arranged equipment. For passengers, the space and facilities setting within the station has a directly effect to transit efficiency and characteristic of Passengers Moving including cut across, follow, stand and seek, also influence transportation function of the station. We could understand the idea of variety characteristics of the development of the concept of cellular automata theory of multi-agent systems after the literature archive. According to the results of previous researchers, Netlogo can effectively establish an environment which closes to the actual situation for complex Passengers Moving simulation. The simulation framework has three core elements: environment setting, personnel generation and path selection. The path selection of the pedestrian within the space will be associate to the Field and pedestrian purpose. Multiple Field setting combine with different purpose could generate a scenario which closes to the real phenomenon. Scenarios simulate operations could be subdividing to three parts: usual shift, high-flow and space improvement. Comparison different simulation scenarios, precede the simulations tests of the space improvement, compare to original simulation data to seek out the best result. The simulation system which established by this study could be a reference material for initial planning and design of interior space of the station or the evaluation after running. And improvement by system simulation afterward. Simulation based on the results of this study can be found in the improved transport improved the peak values are relatively high to the maximum number of transport growth from 39 to 42, 8% of the total performance improvement can also be found to produce a more intensive peak, while the overall transport the number of people grew from the previous 1613 to 2068 people, an increase of 28.21% overall efficiency, showing that the fixed line division of the improvement plan for the transfer efficiency has a very positive help.
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Livres sur le sujet "Moving base station"

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Cavanagh, Patrick, Lorella Battelli et Alex Holcombe. Dynamic Attention. Sous la direction de Anna C. (Kia) Nobre et Sabine Kastner. Oxford University Press, 2014. http://dx.doi.org/10.1093/oxfordhb/9780199675111.013.016.

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The authors review how attention helps track and process dynamic events, selecting and integrating information across time and space to produce a continuing identity for a moving, changing target. Rather than a fixed ‘spotlight’ that helps identify a static target, attention needs a mobile window or ‘pointer’ to track a moving target, picking up pieces of evidence along the way to determine not just what the target is, but what it is doing. Behavioural studies show that this dynamic version of attention is model-based, using familiar trajectories to help identify a target and to guide encoding of continuing input from its path. Attention has very coarse temporal resolution for both static and moving targets. However, when the focus of selection is on the move, a given location on a moving target’s path can be selected for extremely brief instants, as little as 50 ms, compared to the typical ‘dwell time’ or minimum duration of attention selection at a fixed location, of 200 ms or more. To determine the path of a moving object, attention must accurately process and sort the onsets and offsets in order to match an offset to the subsequent onset. This aspect of dynamic attention has been called the ‘when’ pathway and patient studies show that it is a qualitatively different system from spatial attention, being completely based in the right parietal lobe for events in both hemifields. Finally, like the salience map of spatial attention, temporal attention may have its own map that guides allocation to upcoming, current, and recent moments to select information at the appropriate time, changing the experience of time as it does so.
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Tolstoy, Leo. Anna Karenina. Traduit par Rosamund Bartlett. Oxford University Press, 2016. http://dx.doi.org/10.1093/owc/9780198748847.001.0001.

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‘Love… it means too much to me, far more than you can understand.’ At its simplest, Anna Karenina is a love story. It is a portrait of a beautiful and intelligent woman whose passionate love for a handsome officer sweeps aside all other ties - to her marriage and to the network of relationships and moral values that bind the society around her. The love affair of Anna and Vronsky is played out alongside the developing romance of Kitty and Levin, and in the character of Levin, closely based on Tolstoy himself, the search for happiness takes on a deeper philosophical significance. One of the greatest novels ever written, Anna Karenina combines penetrating psychological insight with an encyclopedic depiction of Russian life in the 1870s. The novel takes us from high society St Petersburg to the threshing fields on Levin's estate, with unforgettable scenes at a Moscow ballroom, the skating rink, a race course, a railway station. It creates an intricate labyrinth of connections that is profoundly satisfying, and deeply moving. Rosamund Bartlett's translation conveys Tolstoy's precision of meaning and emotional accuracy in an English version that is highly readable and stylistically faithful. Like her acclaimed biography of Tolstoy, it is vivid, nuanced, and compelling.
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Chapitres de livres sur le sujet "Moving base station"

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Chin, Tommy, et Kaiqi Xiong. « MPBSD : A Moving Target Defense Approach for Base Station Security in Wireless Sensor Networks ». Dans Wireless Algorithms, Systems, and Applications, 487–98. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-42836-9_43.

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Yoshihisa, Tomoki, Yusuke Gotoh et Akimitsu Kanzaki. « A Continuous Media Data Broadcasting Model for Base Stations Moving Straight ». Dans Advances in Networked-based Information Systems, 650–57. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-29029-0_64.

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Bao, Yadong, Changjian Liu, Hongzhou Chai et Xu Feng. « VTEC Modeling and Analysis for Single Station Based on Moving Time Window ». Dans Lecture Notes in Electrical Engineering, 611–18. Singapore : Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0940-2_53.

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Liu, Xiang, Yuqing Liu, Xiuqing Zhu, Ming An et Fuchao Hu. « Virtual Reality Based Navigation Training for Astronaut Moving in a Simulated Space Station ». Dans Lecture Notes in Computer Science, 416–23. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-39907-2_40.

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Flach, Sabine. « Moving is in Every Direction ». Dans Bewegungsszenarien der Moderne, 165–76. Heidelberg, Germany : Universitätsverlag WINTER, 2021. http://dx.doi.org/10.33675/2021-82537264-10.

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Traditionally, art history divided the arts into four genres: painting and sculpture, poetry and music. Hence the art-historical canon was dominated by a strict division into the arts of space and those of time. Movement (both of an internal and externalized kind) did not find a place within this classificatory corset. In 1766, Gotthold Ephraim Lessing framed the classical art-theoretical approach through his famous text ‚Laocoon: An Essay on the Limits of Painting and Poetry‘, in which he splits the arts into those unfolding in time and those unfolding in space. Lessing’s ‚Laocoon‘ is the founding text defining poetry and music as time-based, sculpture and painting as space-orientated. By 1900, this strict system of classification and hierarchization began to dissolve, giving way to cross-border experiments in the arts of the twentieth century up to the present day. This overturning of classical genre divisions between the static and the dynamic arts, between sculpture, installation, and performance enables us to examine artworks as variations of movement in terms of ‚constellations between scene and scenario‘. Furthermore, the development of movement as an artform implies the activation of the audience in participatory arts practice.
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Isenegger, Laurent, Luis Salgado et Narciso García. « Moving Objects Segmentation Based on Automatic Foreground / Background Identification of Static Elements ». Dans Advanced Concepts for Intelligent Vision Systems, 491–98. Berlin, Heidelberg : Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11558484_62.

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Fogarty, Irene. « Coloniality, Natural World Heritage and Indigenous Peoples : A Critical Analysis of World Heritage Cultural Governance ». Dans 50 Years World Heritage Convention : Shared Responsibility – Conflict & ; Reconciliation, 43–55. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-05660-4_4.

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AbstractThis essay analyses synergies and antagonisms of World Heritage cultural governance in respect of Indigenous peoples’ participation and rights. In tandem with recognition of nature-culture interlinkages, the World Heritage Committee has demonstrated a growing concern with rights-based approaches, moving Indigenous peoples’ rights to a more normative position in the Convention’s implementation. However, the Convention follows a Statist approach and adheres to a Eurocentric conceptualisation of nature, reproduced through World Heritage cultural governance. These issues can result in power asymmetries, coloniality of knowledge and the relegation of Indigenous peoples’ worldviews and rights.
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Su, Yingli, Fei Xue, Yong Lu et Kun Mao. « Application of RBF-TFI Moving Mesh Technology Based on Structural Grid in Static Aeroelasticity ». Dans Lecture Notes in Electrical Engineering, 605–13. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-7423-5_60.

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Soldani, M., et O. Faggioni. « A Tool to Aid the Navigation in La Spezia Harbour (Italy) ». Dans Geomatics for Green and Digital Transition, 89–101. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-17439-1_6.

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AbstractThe knowledge of sea level in harbours is very important to manage port activities (safety of navigation, prevention of ship stranding, optimization of vessel loading, water quality control). In this article we describe the use of a software tool developed to help local authorities and working organizations to optimize navigation and avoid or manage hazardous situations due to sea level changes in port basins. This prototype application, starting from reading data coming from a monitoring station in La Spezia harbour (in North Western Italy), updates dynamically the port bathymetry based on sea level oscillations (measured in the past or real-time, or expected in the near future). Then, it detects potentially dangerous areas for a given ship moving in the basin at a certain time, by means of the idea of “virtual traffic lights”: sea level variations are provided as parameters to the application that performs the updating of the bathymetric map and the subdivision of the harbour in allowed (green)/warning (yellow)/prohibited (red) areas for each ship, based on its draft. The tool can provide a useful support interface to competent authorities to avoid or manage critical situations by detecting hazardous areas for a given vessel at a given time.
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Yao, Wei, et Jianwei Wu. « Airborne LiDAR for Detection and Characterization of Urban Objects and Traffic Dynamics ». Dans Urban Informatics, 367–400. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8983-6_22.

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AbstractIn this chapter, we present an advanced machine learning strategy to detect objects and characterize traffic dynamics in complex urban areas by airborne LiDAR. Both static and dynamical properties of large-scale urban areas can be characterized in a highly automatic way. First, LiDAR point clouds are colorized by co-registration with images if available. After that, all data points are grid-fitted into the raster format in order to facilitate acquiring spatial context information per-pixel or per-point. Then, various spatial-statistical and spectral features can be extracted using a cuboid volumetric neighborhood. The most important features highlighted by the feature-relevance assessment, such as LiDAR intensity, NDVI, and planarity or covariance-based features, are selected to span the feature space for the AdaBoost classifier. Classification results as labeled points or pixels are acquired based on pre-selected training data for the objects of building, tree, vehicle, and natural ground. Based on the urban classification results, traffic-related vehicle motion can further be indicated and determined by analyzing and inverting the motion artifact model pertinent to airborne LiDAR. The performance of the developed strategy towards detecting various urban objects is extensively evaluated using both public ISPRS benchmarks and peculiar experimental datasets, which were acquired across European and Canadian downtown areas. Both semantic and geometric criteria are used to assess the experimental results at both per-pixel and per-object levels. In the datasets of typical city areas requiring co-registration of imagery and LiDAR point clouds a priori, the AdaBoost classifier achieves a detection accuracy of up to 90% for buildings, up to 72% for trees, and up to 80% for natural ground, while a low and robust false-positive rate is observed for all the test sites regardless of object class to be evaluated. Both theoretical and simulated studies for performance analysis show that the velocity estimation of fast-moving vehicles is promising and accurate, whereas slow-moving ones are hard to distinguish and yet estimated with acceptable velocity accuracy. Moreover, the point density of ALS data tends to be related to system performance. The velocity can be estimated with high accuracy for nearly all possible observation geometries except for those vehicles moving in or (quasi-)along the track. By comparative performance analysis of the test sites, the performance and consistent reliability of the developed strategy for the detection and characterization of urban objects and traffic dynamics from airborne LiDAR data based on selected features was validated and achieved.
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Actes de conférences sur le sujet "Moving base station"

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Pandey, Romit, Arun Kumar Singh et K. Madhava Krishna. « Multi-robot exploration with communication requirement to a moving base station ». Dans 2012 IEEE International Conference on Automation Science and Engineering (CASE 2012). IEEE, 2012. http://dx.doi.org/10.1109/coase.2012.6386475.

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Alkesh, Abhijeet, Ashutosh Kumar Singh et N. Purohit. « A Moving Base Station Strategy Using Fuzzy Logic for Lifetime Enhancement in Wireless Sensor Network ». Dans 2011 International Conference on Communication Systems and Network Technologies (CSNT). IEEE, 2011. http://dx.doi.org/10.1109/csnt.2011.49.

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Mpimis, Thanassis, Panagiotis Sotiriou et Vassilis Gikas. « Addressing the Potential of GNSS Moving Base Station Technique for Vehicular C-ITS Applications : Preliminary Tests and Results ». Dans Proceedings of conference GIS Ostrava 2021 Advances in Localization and Navigation. Vysoká škola báňská - Technická univerzita Ostrava, 2021. http://dx.doi.org/10.31490/9788024845050-10.

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Banerjee, Subharthi, Michael Hempel, Pejman Ghasemzadeh, Naji Albakay et Hamid Sharif. « High Speed Train Wireless Communication : Handover Performance Analysis for Different Radio Access Technologies ». Dans 2019 Joint Rail Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/jrc2019-1247.

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High Speed Trains (HST) face some of the most stringent requirements for ensuring passenger safety and comfort while operating at very high velocities. HST wireless communication systems therefore similarly require special considerations for network design, technology selection and system implementation. For infrastructure-based wireless communications, a handover occurs whenever a radio transitions from the coverage of the current base station to the next base station. The faster the train moves the shorter the time that it spends under coverage area before a handover is required. For HST this can be as short as 10–20 seconds. Furthermore, a HST moving at 220 mph experiences significant fast and small-scale wireless signal fading due to this velocity, but similarly may incur frequent connectivity losses due to the rapid transit across coverage areas. A route consisting of viaducts, bridges, tunnels or hilly regions drastically increases the need for rapid handovers since a large number of base stations are required to provide coverage and achieve acceptable Quality-of-Service (QoS) in such environments. Due to the relatively fixed amount of time needed to complete a handover, and the possibility of failed handovers, this reduces the usable time under coverage, and thus ensuring an optimal handover strategy selection is vital. Most of the routes span rural and suburban areas, which reinforces the need for a comprehensive network planning strategy, as these areas tend to be underdeveloped for cellular coverage. Given the complexity in available radio spectrum resources, detailed studies are required to aid in this technology selection process. However, with the predicted increase in the demand of railroad network data traffic generated by onboard sensors, onboard control and operation devices, passenger Internet services, etc., it becomes apparent that more resources are needed than are provided by current technologies such as LTE. Thus, including 5G New Radio for Railways (5G-NR2) in the consideration does not only provide railways a more cost-effective licensing option for frequencies, but also an opportunity to select the best possible radio access method for a given HST corridor. In this paper, we focus on the metrics related to handover and how they correlate with different radio access technologies for HST. Our results integrate the uncertainty of environmental factors to provide answers on technology selection driven by specific route, inter-site distances, and available bandwidth. Our wireless communication simulation results are driven by well recognized mathematical models that consider a variety of key parameters. The analysis of the handover performance will offer insights vital to future railroad network planning for multivariate radio access technologies, and to answer crucial questions about the potential for using frequency bands above 6 GHz in HST.
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Barolli, Leonard, Tao Yang, Elis Kulla, Shinji Sakamoto et Gjergji Mino. « Performance Comparison of Moving Sensors and Sink with Static Sink in WSNs ». Dans 2013 16th International Conference on Network-Based Information Systems (NBiS). IEEE, 2013. http://dx.doi.org/10.1109/nbis.2013.104.

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Zhang, Runwei, Patrick Thiran et Martin Vetterli. « Virtually Moving Base Stations for Energy Efficiency in Wireless Sensor Networks ». Dans MobiHoc'15 : The Sixteenth ACM International Symposium on Mobile Ad Hoc Networking and Computing. New York, NY, USA : ACM, 2015. http://dx.doi.org/10.1145/2746285.2746291.

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Girdhar, Yogesh, Dmitriy Rivkin, Di Wu, Michael Jenkin, Xue Liu et Gregory Dudek. « Optimizing Cellular Networks via Continuously Moving Base Stations on Road Networks ». Dans 2021 IEEE International Conference on Robotics and Automation (ICRA). IEEE, 2021. http://dx.doi.org/10.1109/icra48506.2021.9561052.

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Sommer, Burkhard, Carsten Mahler, Gary Stables et Lee Mitchell. « Competitive System Concepts for Electrification of Subsea Structures in Co-Existence with Electro-Hydraulic Control Systems ». Dans Offshore Technology Conference. OTC, 2022. http://dx.doi.org/10.4043/32127-ms.

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Abstract Objectives/Scope Subsea production systems can benefit today from the application of partial electrification concepts in hybrid scenarios coexisting with electro-hydraulic (E/H) control systems. This paper is based on a real project that included a system of conventional E/H subsea production trees, manifolds, and a boosting station, together with a subsea distribution and control system. Based on this architecture, an alternative field concept optimized for partial electric actuation resulted in very competitive commercial scenarios in addition to operational benefits and increased sustainability. Methods, Procedures, Process Using electric actuators for valves on subsea production system structures is becoming more common but is still limited. The reason for this limitation is that the systems are often not fully optimized for these uses. There are operational and conceptual differences between traditional electro-hydraulic systems and electric actuation systems. For many years subsea engineers have applied proven field and system concepts and established work practices to field development and subsea control scenarios, which might not have been successful if applied to electric actuation without further change. Electric actuators cannot replace hydraulic actuators without also rethinking the underlying system architecture. Results, Observations, Conclusions When alternative configurations were analyzed, the basic architecture was maintained. But instead of simply replacing the hydraulic actuator with electric actuators, it was important to consider how the actuators were connected to the control system in terms of distance, communication, and overall layout. Holistic optimization of the subsea distribution and control system introduces significant benefits to the whole system. However, electric actuators have different performance and diagnostics characteristics than hydraulic actuation systems. Specific sessions were held with the operator, focusing on system performance and the operational advantages of the proposed system. The subsea distribution system and its control philosophy were changed from a traditional layout to a layout taking full advantage of the benefits electric actuators are offering. This paper uses before-and-after comparisons to show how moving from traditional subsea control methods to a "hybrid" system enables a more sustainable architecture by combining "traditional" products with newer electric actuation methods. As a result of those benefits, the end user in this case study selected the hybrid system and replaced the original base case.
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Sommer, Burkhard, Carsten Mahler, Gary Stables et Lee Mitchell. « Competitive System Concepts for Electrification of Subsea Structures in Co-Existence with Electro-Hydraulic Control Systems ». Dans Offshore Technology Conference. OTC, 2022. http://dx.doi.org/10.4043/32127-ms.

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Abstract Objectives/Scope Subsea production systems can benefit today from the application of partial electrification concepts in hybrid scenarios coexisting with electro-hydraulic (E/H) control systems. This paper is based on a real project that included a system of conventional E/H subsea production trees, manifolds, and a boosting station, together with a subsea distribution and control system. Based on this architecture, an alternative field concept optimized for partial electric actuation resulted in very competitive commercial scenarios in addition to operational benefits and increased sustainability. Methods, Procedures, Process Using electric actuators for valves on subsea production system structures is becoming more common but is still limited. The reason for this limitation is that the systems are often not fully optimized for these uses. There are operational and conceptual differences between traditional electro-hydraulic systems and electric actuation systems. For many years subsea engineers have applied proven field and system concepts and established work practices to field development and subsea control scenarios, which might not have been successful if applied to electric actuation without further change. Electric actuators cannot replace hydraulic actuators without also rethinking the underlying system architecture. Results, Observations, Conclusions When alternative configurations were analyzed, the basic architecture was maintained. But instead of simply replacing the hydraulic actuator with electric actuators, it was important to consider how the actuators were connected to the control system in terms of distance, communication, and overall layout. Holistic optimization of the subsea distribution and control system introduces significant benefits to the whole system. However, electric actuators have different performance and diagnostics characteristics than hydraulic actuation systems. Specific sessions were held with the operator, focusing on system performance and the operational advantages of the proposed system. The subsea distribution system and its control philosophy were changed from a traditional layout to a layout taking full advantage of the benefits electric actuators are offering. This paper uses before-and-after comparisons to show how moving from traditional subsea control methods to a "hybrid" system enables a more sustainable architecture by combining "traditional" products with newer electric actuation methods. As a result of those benefits, the end user in this case study selected the hybrid system and replaced the original base case.
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Heras Evangelio, Ruben, et Thomas Sikora. « Complementary background models for the detection of static and moving objects in crowded environments ». Dans 2011 8th IEEE International Conference on Advanced Video and Signal Based Surveillance (AVSS). IEEE, 2011. http://dx.doi.org/10.1109/avss.2011.6027297.

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Rapports d'organisations sur le sujet "Moving base station"

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Ray, Laura, Madeleine Jordan, Steven Arcone, Lynn Kaluzienski, Benjamin Walker, Peter Ortquist Koons, James Lever et Gordon Hamilton. Velocity field in the McMurdo shear zone from annual ground penetrating radar imaging and crevasse matching. Engineer Research and Development Center (U.S.), décembre 2021. http://dx.doi.org/10.21079/11681/42623.

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The McMurdo shear zone (MSZ) is strip of heavily crevassed ice oriented in the south-north direction and moving northward. Previous airborne surveys revealed a chaotic crevasse structure superimposed on a set of expected crevasse orientations at 45 degrees to the south-north flow (due to shear stress mechanisms). The dynamics that produced this chaotic structure are poorly understood. Our purpose is to present our field methodology and provide field data that will enable validation of models of the MSZ evolution, and here, we present a method for deriving a local velocity field from ground penetrating radar (GPR) data towards that end. Maps of near-surface crevasses were derived from two annual GPR surveys of a 28 km² region of the MSZ using Eulerian sampling. Our robot-towed and GPS navigated GPR enabled a dense survey grid, with transects of the shear zone at 50 m spacing. Each survey comprised multiple crossings of long (> 1 km) crevasses that appear in echelon on the western and eastern boundaries of the shear zone, as well as two or more crossings of shorter crevasses in the more chaotic zone between the western and eastern boundaries. From these maps, we derived a local velocity field based on the year-to-year movement of the same crevasses. Our velocity field varies significantly from fields previously established using remote sensing and provides more detail than one concurrently derived from a 29-station GPS network. Rather than a simple velocity gradient expected for crevasses oriented approximately 45 degrees to flow direction, we find constant velocity contours oriented diagonally across the shear zone with a wavy fine structure. Although our survey is based on near-surface crevasses, similar crevassing found in marine ice at 160 m depth leads us to conclude that this surface velocity field may hold through the body of meteoric and marine ice. Our success with robot-towed GPR with GPS navigation suggests we may greatly increase our survey areas.
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