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Author: George Calhoun
Publisher: Artech House Telecommunication
ISBN:
Category : Business & Economics
Languages : en
Pages : 474
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Book Description
The uncertain future of mobile telephony - Mobile radio before cellular : 1921-1968 - The cellular idea : 1947-1982 - Cellular realities - The reemergence of digital communication - The digital vocabulary - The advantages of digital communication - Designing for the mobile environment - Designing for frequency reuse - Other design considerations - The broad technology alternatives - Alternatives for the radio link - Alternative system architectures : cell level - Alternative system architectures : network level - Choosing the future : evaluating the alternatives - A look ahead.
Author: George Calhoun
Publisher: Artech House Telecommunication
ISBN:
Category : Business & Economics
Languages : en
Pages : 474
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Book Description
The uncertain future of mobile telephony - Mobile radio before cellular : 1921-1968 - The cellular idea : 1947-1982 - Cellular realities - The reemergence of digital communication - The digital vocabulary - The advantages of digital communication - Designing for the mobile environment - Designing for frequency reuse - Other design considerations - The broad technology alternatives - Alternatives for the radio link - Alternative system architectures : cell level - Alternative system architectures : network level - Choosing the future : evaluating the alternatives - A look ahead.
Author: James J. Caffery, Jr.
Publisher: Springer Science & Business Media
ISBN: 0306473291
Category : Technology & Engineering
Languages : en
Pages : 196
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Book Description
With the increasing market penetration of cellular telephones, the number of E-911 calls placed by cellular telephones has grown cons- erably. This growth in E-911 calls led to a 1996 FCC ruling requiring that all cellular, PCS, and SMR licensees provide location information for the support of E-911 safety services. The provision of such location information is to be implemented in two phases. Phase I, whose deadline has already been passed, requires that wireless carriers relay the caller’s telephone number along with location of the cell site and/or sector se- ing the call, to a designated Public Safety Answering Point (PSAP). This information allows the PSAP to return the call if disconnected. Phase II, to be completed by October 1, 2001, is much more stringent and requires that the location of an E-911 caller be determined and reported with an rms location accuracy of 125 m in 67% of the cases. The applications of wireless location technology extend well beyond E-911 services. Location information can be used by cellular telephone operators themselves for more effective management of their radio - sources, so as to achieve greater spectral efficiencies. Resource m- agement algorithms such as hand-offs between cell sites, channel assi- ments, and others can all benefit from subscriber location information. Location information obtained from vehicular based cellular telephones can be used as an input to Intelligent Transportation Systems (ITS), and in particular traffic management and traveler information systems.
Author: Baldomero Coll-Perales
Publisher: Universidad Miguel Hernández
ISBN: 841602409X
Category : Technology & Engineering
Languages : en
Pages : 200
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Book Description
El presente libro ha sido diseñado para ayudar a los estudiantes del Grado en Ingeniería de Tecnologías de Telecomunicación en el empleo de las herramientas utilizadas en las prácticas de las asignaturas de comunicaciones móviles, y para mostrarles cómo analizar y entender los resultados que se obtienen con dichas herramientas. Para ello, en primer lugar el libro describe de forma didáctica cómo utilizar las herramientas de medida profesionales empleadas en las prácticas de comunicaciones móviles en la UMH. Dichas herramientas se emplean habitualmente por ingenieros de planificación radio para monitorizar en tiempo real el rendimiento de las redes de comunicaciones móviles mediante drive tests. Dicha descripción incluye una presentación detallada de la herramienta de testeo profesional Nemo Handy desarrollada por Anite. Dicha herramienta se incluye en un terminal celular en modo ingeniería, empleado para monitorizar en tiempo real el funcionamiento y rendimiento de las redes celulares, y tomar medidas para su posterior análisis. Dicho análisis se realiza empleando la herramienta Nemo Outdoor, descrita con detalle también en el libro, incluyendo ejemplos sobre cómo realizar los procesados más relevantes. Finalmente, el libro incluye y analiza una serie de medidas se han realizado en un sistema celular UMTS/HSDPA en activo en Elche. En particular, se explica el proceso seguido para realizar dichas medidas empleando Nemo Handy, y se analizan mediante Nemo Outdoor las principales funcionalidades de un sistema celular, como el establecimiento y finalización de llamadas, la selección y re-selección de celdas, el traspaso y el análisis de las descargas de datos y parámetros radio. This book has been designed to guide the students of the Bachelor's in Telecommunications Technology Engineering towards a clear understanding of how to use the laboratory tools, and show them how to analyze and understand the collected measurements. In this context, the book first introduces and describes how to use the professional measurement tools employed in the laboratory activities of the mobile communications course at UMH. These tools are commonly used by cellular radio engineers to monitor in real-time the performance of cellular networks through drive tests. The book first presents the Nemo Handy professional measurement testing tool developed by Anite. This tool is included in an engineering-mode cellular handset used to monitor in real-time the operation of cellular networks, and collect measurements for post-processing. Such processing is done using the Nemo Outdoor tool that is also introduced in the book, including examples of how to perform the most relevant processing actions. Finally, this book shows how to conduct some measurement and analysis processes using Nemo Handy and Nemo Outdoor. The measurements have been conducted over live UMTS and HSDPA networks in the city of Elche, and cover the analysis of important cellular functionalities like establishment and release of a call, cell selection and reselection, handovers, and analysis of data downloads and cellular parameters. This chapter shows with practical examples how to conduct the measurements using Nemo Handy, and how to interpret with Nemo Outdoor the exchanged cellular signaling messages in order to monitor the operation of cellular networks.
Author: Kamiar Radnosrati
Publisher: Linköping University Electronic Press
ISBN: 9176852695
Category :
Languages : en
Pages : 102
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Book Description
The possibilities for positioning in cellular networks has increased over time, pushed by increased needs for location based products and services for a variety of purposes. It all started with rough position estimates based on timing measurements and sector information available in the global system for mobile communication (gsm), and today there is an increased standardization effort to provide more position relevant measurements in cellular communication systems to improve on localization accuracy and availability. A first purpose of this thesis is to survey recent efforts in the area and their potential for localization. The rest of the thesis then investigates three particular aspects, where the focus is on timing measurements. How can these be combined in the best way in long term evolution (lte), what is the potential for the new narrow-band communication links for localization, and can the timing measurement error be more accurately modeled? The first contribution concerns a narrow-band standard in lte intended for internet of things (iot) devices. This lte standard includes a special position reference signal sent synchronized by all base stations (bs) to all iot devices. Each device can then compute several pair-wise time differences that corresponds to hyperbolic functions. Using multilateration methods the intersection of a set of such hyperbolas can be computed. An extensive performance study using a professional simulation environment with realistic user models is presented, indicating that a decent position accuracy can be achieved despite the narrow bandwidth of the channel. The second contribution is a study of how downlink measurements in lte can be combined. Time of flight (tof) to the serving bs and time difference of arrival (tdoa) to the neighboring bs are used as measurements. From a geometrical perspective, the position estimation problem involves computing the intersection of a circle and hyperbolas, all with uncertain radii. We propose a fusion framework for both snapshot estimation and filtering, and evaluate with both simulated and experimental field test data. The results indicate that the position accuracy is better than 40 meters 95% of the time. A third study in the thesis analyzes the statistical distribution of timing measurement errors in lte systems. Three different machine learning methods are applied to the experimental data to fit Gaussian mixture distributions to the observed measurement errors. Since current positioning algorithms are mostly based on Gaussian distribution models, knowledge of a good model for the measurement errors can be used to improve the accuracy and robustness of the algorithms. The obtained results indicate that a single Gaussian distribution is not adequate to model the real toa measurement errors. One possible future study is to further develop standard algorithms with these models.
Author: Husni Hammuda
Publisher: Wiley
ISBN: 9780471956419
Category : Technology & Engineering
Languages : en
Pages : 210
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Book Description
Most radio systems have become so popular that the available frequency bands are able to meet only a fraction of the demand. This book gives practical solutions for optimizing efficiency of mobile radio cells.
Author: Asha Mehrotra
Publisher: Artech House Publishers
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 488
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Book Description
Covering analog and digital cellular communication systems, this book outlines solutions to analog cellular signal coverage. It describes practical digital microwave schemes used to transfer information and digitized speech among cell sites, the Mobile Telephone Switching Office, and the local telephone exchange, and shows how cellular radio systems can be tied to a nationwide network. Includes 500 equations and 212 illustrations.
Author: Michel Daoud Yacoub
Publisher: Routledge
ISBN: 1351447378
Category : Technology & Engineering
Languages : en
Pages : 504
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Book Description
Foundations of Mobile Radio Engineering is a comprehensive survey covering the main topics of mobile radio systems. Concepts considered include the theory of patterns and symmetry and how it impacts hexagonal cell tessellation, long-term fading and log-normal distribution, short-term fading and Rayleigh distribution, indoor propagation and Rice dis
Author: United States International Trade Commission
Publisher:
ISBN:
Category :
Languages : en
Pages : 58
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Book Description
Author: Ekram Hossain
Publisher: John Wiley & Sons
ISBN: 1118502671
Category : Technology & Engineering
Languages : en
Pages : 346
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Book Description
Providing an extensive overview of the radio resource management problem in femtocell networks, this invaluable book considers both code division multiple access femtocells and orthogonal frequency-division multiple access femtocells. In addition to incorporating current research on this topic, the book also covers technical challenges in femtocell deployment, provides readers with a variety of approaches to resource allocation and a comparison of their effectiveness, explains how to model various networks using Stochastic geometry and shot noise theory, and much more.
Author: Joseph Hoy
Publisher: John Wiley & Sons
ISBN: 1394197195
Category : Technology & Engineering
Languages : en
Pages : 420
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Book Description
FORENSIC RADIO SURVEY TECHNIQUES FOR CELL SITE ANALYSIS Overview of the end-to-end process of planning, undertaking, and reporting of forensic radio surveying to support cell site analysis The newly updated and revised Second Edition of Forensic Radio Survey Techniques for Cell Site Analysis provides an overview of the end-to-end process of planning, undertaking, and reporting of forensic radio surveying to support the forensic discipline of cell site analysis. It starts by recapping and explaining, in an accessible way, the theory, structure, and operation of cellular communications networks, then moves on to describe the techniques and devices employed to undertake forensic radio surveys. Worked examples are used throughout to demonstrate the practical steps required to plan and undertake forensic radio surveys, including the methods used to analyze radio survey data and compile it into a court report. A summary section condenses the technical and practical elements of the book into a handy reference resource for busy practitioners. The Second Edition contains 25% brand new material covering 5G New Radio networks and ‘6G and beyond,’ critical communications, mobile satellite communications, IoT networks, Cell Site Analysis Tools, and much more. Other sample topics covered in Forensic Radio Survey Techniques for Cell Site Analysis include: Radio theory, covering RF propagation, basic terminology, propagation modes, multipath transmission, and carrying information on a radio signal Core networks, including 2G, 3G, 4G, and 5G, subscriber and device identifiers, and international and temporary mobile subscriber identities Cell access control, covering cell barring, forbidden LAC/TAC, location updating, inter- and intra-carrier handovers, and 3GPP network types Forensic radio surveys objectives, terminology, and types, along with location, static spot, and indoor surveys The Second Edition of Forensic Radio Survey Techniques for Cell Site Analysis is an essential reference on the subject for police analysts, practitioners, technicians, investigators, and cell site experts, along with legal professionals and students/trainees in digital forensics.
