Download or read book Voice Communications Over Radio Packet Networks written by Moon Ming Seah and published by . This book was released on 1985 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Voice Communications Over Packet Radio Networks written by M. M. Seah and published by . This book was released on 1985 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of packet virtual circuit technique for voice communications in military radio networks was investigated. The work was concerned with various aspects of networking which include network modeling, communications techniques, traffic analysis and network control. An attempt has been made to develop a simple yet efficient time slot assignment algorithm was analyzed under a variety of slot depths and networks topologies using computer simulation. The Erlang' B results were used to provide more insight into the channel characteristics of the packet radio networks. The capabilities of implementing TDMA/CDMA hybrid schemes in the system were scrutinized. A method to estimate the transmission capacity of the inter-node links was found. We demonstrate its effectiveness in controlling local congestion by computer simulation. Graphical results were presented to highlight the behavior of the proposed packet radio networks. We concluded that an appropriate link weight function would provide efficient and reliable network services. Keywords include: Packet virtual circuit, Voice communications, Routing, Code division multiple access, Network modeling, and Link distance.

Download or read book Modeling and Analysis of Voice and Data in Cognitive Radio Networks written by Subodha Gunawardena and published by Springer Science & Business Media. This book was released on 2014-03-14 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Springer Brief investigates the voice and elastic/interactive data service support over cognitive radio networks (CRNs), in terms of their delay requirements. The increased demand for wireless communication conflicts with the scarcity of the radio spectrum, but CRNS allow for more efficient use of the networks. The authors review packet level delay requirements of the voice service and session level delay requirements of the elastic/interactive data services, particularly constant-rate and on-off voice traffic capacities in CRNs with centralized and distributed network coordination. Some generic channel access schemes are considered as the coordination mechanism, and call admission control algorithms are developed for non-fully-connected CRNs. Other key topics include the advantages of supporting voice traffic flows with different delay requirements, the mean response time of the elastic data traffic over a centralized CRN, and effects of the traffic load at the base station and file length (service time requirement) distribution on the mean response time. The brief is designed for professionals and researchers working with wireless networks, cognitive radio, and communications. It is also a helpful reference for advanced-level students interested in efficient wireless communications.

Download or read book The Utilization of Amateur Radio in Disaster Communications written by Lynn Ellen Edwards and published by DIANE Publishing. This book was released on 1994 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews the various types of technology available and provides case studies of ham radio participation with the American Red Cross, and with local Red Cross chapters. Also examines a local Amateur Radio Emergency Services group. Concludes with a set of recommendations for improved cooperation between hams and government and nonprofit agencies that deal with disaster response.

Download or read book QoS Support for Voice Packet Transmission Over Cognitive Radio Networks written by Khaled Ali and published by . This book was released on 2010 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cognitive Radio Networks (CRNs) provide a solution for the spectrum scarcity problem facing the wireless communications community. However, due to the infancy of CRNs, further research is needed before we can truly benefit from CRNs. The basic concept of CRNs relies on utilizing the unused spectrum of a primary network, without interfering with the activity of primary users (PUs). In order to successfully achieve that, users in a CRN has to perform spectrum sensing, spectrum management, spectrum mobility, and spectrum sharing. The latter, which is the focus of our research, deals with how secondary users (SUs) share the unused spectrum. Furthermore, to be able to utilize CRNs in practical applications, a certain level of quality-of-service (QoS) should be guaranteed to SUs in such networks. QoS requirements vary according to the application. Interested in voice communications, we propose a packet scheduling scheme that orders the SUs' transmissions according to the packet dropping rate and the number of packets queued waiting for transmission. Two medium access control (MAC) layer protocols, based on the mentioned scheduling scheme, are proposed for a centralized CRN. In addition, the scheduling scheme is adapted for a distributed CRN, by introducing a feature that allows SUs to organize access to the available spectrum without the need for a central unit. Finally, extensive simulation based experiments are carried out to evaluate the proposed protocols and compare their performance with that of other MAC protocols designed for CRNs. These results reflect the effectiveness of our proposed protocols to guarantee the required QoS for voice packet transmission, while maintaining fairness among SUs in a CRN.

Download or read book Voice Over Packet Networks written by David J. Wright and published by Wiley-Blackwell. This book was released on 2001-03-30 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the hottest topics in the telecommuncations industry today is the migration of voice traffic from the circuit switched Telco networks to packet switched networks such as IP, ATM, Frame Relay and access technologies such as DSL (Digital Subscriber Line) and Packet Cable. The sheer volume of voice traffic, together with the efficiencies of packet transport and the opportunity to offer new features on voice calls, has made internetworking, between circuit and packet transport, vital while this migration is in progress. Presents a concise treatment of a complex subject providing up-to-date coverage of all relevant packet voice technologies and an evaluation of how they compare Explains how and why to transport voice over packet networks Includes MEGACO: Media Gateway Control Protocol, Voice over Packet Cable and Voice over DSL Enables the reader to obtain information rapidly by featuring numerous bulleted lists and extensive diagrams Voice over Packet Networks is comprehensive and compact and will be welcomed by both engineers and planners in the telecommunications industry, as well as graduate and senior undergraduate students on telecommunication courses.

Download or read book Perspectives on Packetized Voice and Data Communications written by William Lidinsky and published by Institute of Electrical & Electronics Engineers(IEEE). This book was released on 1991 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Voice Over MPLS written by Daniel Minoli and published by McGraw Hill Professional. This book was released on 2002-05-23 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: MPLS is many things to many people. If you’re moving IP voice traffic, it may mean performance gains for you. Daniel Minoli’s Voice Over MPLS gives you the technical and business lowdown on innovative new solutions for packet-based voice. What does it take to build flexible, high-performance networks with enhanced quality of service? Maybe not as much as you think. RELIABLE VOICE SERVICES THAT CUSTOMERS CAN AFFORD With VoMPLS, you can deliver the quality associated with VoIP over ATM links without the cost in either bandwidth or equipment. Based on label-switching standards from the IETF and the work of a number of leading companies, Voice over MPLS lets you packetize voice without the added overhead of IP encapsulation. It also suppresses periods of silence, freeing up bandwidth for other uses. From one of the most experienced names in telecom technology, Voice Over MPLS shows you how to— * Provide multiple, high-quality services without costly leased lines * Deliver low-bandwidth voice over ATM, Frame Relay, or IP * Add phone “lines” without adding equipment * Solve scaling issues for small- and medium-sized users * Obtain consistent call quality without crunching bandwidth * Discover ways to protect revenues during deployment * Evaluate the potential role of VoMPLS in big-picture convergence * Evaluate VoMPLS’s impact on public networks Find the engineering details you need for Label Switched Paths (LSPs), layers, signaling, CoS (Classes of Service), QoS (Quality of Service), VoMPLS in VPNs (Virtual Private Networks), implementation options, deployment, and more.

Download or read book EPC and 4G Packet Networks written by Magnus Olsson and published by Academic Press. This book was released on 2012-10-03 with total page 619 pages. Available in PDF, EPUB and Kindle. Book excerpt: Get a comprehensive and detailed insight into the Evolved Packet Core (EPC) with this clear, concise and authoritative guide – a fully updated second edition that covers the latest standards and industry developments. The latest additions to the Evolved Packet System (EPS) including e.g. Positioning, User Data Management, eMBMS, SRVCC, VoLTE, CSFB. A detailed description of the nuts and bolts of EPC that are required to really get services up and running on a variety of operator networks. An in-depth overview of the EPC architecture and its connections to the wide variety of network accesses, including LTE, LTE-Advanced, WCDMA/HSPA, GSM, WiFi, etc. The most common operator scenarios of EPS and the common issues faced in their design. The reasoning behind many of the design decisions taken in EPC, in order to understand the full details and background of the all-IP core NEW CONTENT TO THIS EDITION • 150+ New pages, new illustrations and call flows • Covers 3GPP Release 9, 10 and 11 in addition to release 8 • Expanded coverage on Diameter protocol, interface and messages • Architecture overview • Positioning • User Data Management • eMBMS (LTE Broadcasting) • H(e)NodeB/Femto Cells • LIPA/SIPTO/Breakout architectures • Deployment Scenarios • WiFi interworking • VoLTE/MMTel, CS fallback and SRVCC SAE is the core network that supports LTE, the next key stage in development of the UMTS network to provide mobile broadband. It aims to provide an efficient, cost-effective solution for the ever-increasing number of mobile broadband subscribers There is no other book on the market that covers the entire SAE network architecture; this book summarizes the important parts of the standards, but goes beyond mere description and offers real insight and explanation of the technology Fully updated with the latest developments since the first edition published, and now including additional material and insights on industry trends and views regarding future potential applications of SAE

Download or read book Voice Communications Over Packet switched Networks written by Jian-xiong Bai and published by . This book was released on 1994 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Packet voice Communication on an Ethernet Local Computer Network written by Timothy A. Gonsalves and published by . This book was released on 1982 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Communication Protocols for Heterogeneous Spread Spectrum Packet Radio Networks written by and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research project has focused on the development of protocols and reception techniques for distributed packet radio networks that exploit directional antennas to provide high-throughput, reliable data and voice communications, and that conserve sensor battery energy when relaying sensor data through the network. The research focused on the development of channel-access protocols, adaptive link protocols, and adaptive routing protocols for packet radio networks that employ spread-spectrum modulation. One goal of the research has been to ensure that critical data is forwarded from microsensors to data-fusion centers or mobile-radio end systems while efficiently utilizing the limited energy in the sensors' nonrechargeable batteries. A primary research emphasis has been the design of protocols that minimize the total energy consumption for store-and-forward routing through the sub-network of microsensors, and that account for energy depletion in individual sensors. An important component of this emphasis is the design of protocols that utilize more capable radio systems in the tactical network whenever possible to minimize the amount of data relaying required of the sensors. A second, related emphasis has been efficient exploitation of the presence within the tactical network of mobile radio systems that utilize directional antennas. Primary topics of the research include the design of the packet-acquisition techniques, channel-access protocols, and resource-management techniques that allow a node with multiple fixed-beam directional antennas to exploit their capabilities without introducing a significant increase in the complexity of the network's protocols. A list of related publications is included.

Download or read book Communications Systems Management Handbook Sixth Edition written by Anura Guruge and published by CRC Press. This book was released on 1999-10-25 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt: Just a decade ago, many industry luminaries predicted the collapse of the centralized data center and IT structure. In its place would be a more decentralized client/server model built upon the Open Systems Interconnect (OSI) networking architecture. However, client/server never fully realized all of its promises, and OSI floundered. Now, instead of client/server and OSI, we have the Web-based model and TCP/IP. Together, Web-oriented technologies (i.e., browsers, web servers, HTML, Java) and TCP/IP are completely changing how the enterprise views its network. Instead of serving as primarily an internal utility, the enterprise network is now a vital means of delivering products and services and of tying an enterprise more closely to its customers, partners and suppliers. The impact to the very structure of the enterprise network could not be more profound. Providing extensive coverage of planning, networking, LANs, systems management, communications issues and trends, Communications Systems Management Handbook, 6th Edition is your most reliable source for solid, dependable solutions to real-world data communications problems. The tips, strategies, and case-studies provided do more than just save you time and money. They also save your data communications network, and with it your professional life. This new edition of the Communications Systems Management Handbook provides you with detailed information on the different facets of change in the enterprise network: Enterprise network architectures LAN and campus networking Remote access WAN Data centers Client and servers Security Network Management What's more, the New Edition is dramatically restructured, providing a more logical grouping of articles into discrete sections that bring focus to a particular enterprise networking topic. In addition, the content of this edition has been substantially updated. Almost three-quarters of the articles are new to this edition. The common theme throughout the handbook is the change that the enterprise network is undergoing and how to manage it. The handbook's generous use of illustrations simplifies the technical workings of networks and communications systems. The comprehensive index makes it easy to find the topics you want and related topics. And because each chapter is written by an expert with first-hand experience in data communications, no other book gives you such a full range of perspectives and explanations of the technical, planning, administrative, personnel, and budget challenges of the communication manager's job. Covering everything from electronic commerce to multimedia, from system design and cost allocation to Ethernet switches and the impact of virtual private networks, this is your one-stop source for the best, most essential data communications expertise to be found anywhere. The Communications Systems Management Handbook serves as an information tool for proven advice and methods on managing network services and costs, creating networking solutions, and preparing for advanced communications network technologies.

Download or read book Focal Illustrated Dictionary of Telecommunications written by Xerxes Mazda and published by Taylor & Francis. This book was released on 2013-05-02 with total page 693 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Focal Illustrated dictionary of Telecommunications is an invaluable resource for anyone studying, entering, or already working in the telecommunications industry. * Written by experts with specialist knowledge * Contains essential data for on-the-job use * Includes over 6,000 terms, definitions and acronyms * Has over 350 line drawings * The most comprehensive reference source of this nature A Technical Manager for Nortel Networks, Fraidoon Mazda has held various senior technical posts within the electronics and telecommunications industries. He is editor of the Telcommunications Engineer's Reference Book, now in its second edition, and has also edited a series of eight pocketbooks derived from this major work. Since obtaining his PhD from Cambridge University, Dr. Xerxes Mazda has worked at the Science Museum, London, in various research and management positions. He is currently the Associate Curator of Communications.

Download or read book Mobile Communications Handbook written by Jerry D. Gibson and published by CRC Press. This book was released on 2017-12-19 with total page 817 pages. Available in PDF, EPUB and Kindle. Book excerpt: With 26 entirely new and 5 extensively revised chapters out of the total of 39, the Mobile Communications Handbook, Third Edition presents an in-depth and up-to-date overview of the full range of wireless and mobile technologies that we rely on every day. This includes, but is not limited to, everything from digital cellular mobile radio and evolving personal communication systems to wireless data and wireless networks Illustrating the extraordinary evolution of wireless communications and networks in the last 15 years, this book is divided into five sections: Basic Principles provides the essential underpinnings for the wide-ranging mobile communication technologies currently in use throughout the world. Wireless Standards contains technical details of the standards we use every day, as well as insights into their development. Source Compression and Quality Assessment covers the compression techniques used to represent voice and video for transmission over mobile communications systems as well as how the delivered voice and video quality are assessed. Wireless Networks examines the wide range of current and developing wireless networks and wireless methodologies. Emerging Applications explores newly developed areas of vehicular communications and 60 GHz wireless communications. Written by experts from industry and academia, this book provides a succinct overview of each topic, quickly bringing the reader up to date, but with sufficient detail and references to enable deeper investigations. Providing much more than a "just the facts" presentation, contributors use their experience in the field to provide insights into how each topic has emerged and to point toward forthcoming developments in mobile communications.

Download or read book Simulating Conversations for the Prediction of Speech Quality written by Thilo Michael and published by Springer Nature. This book was released on 2023-06-30 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the simulation of conversations through a novel approach of predicting speech quality based on the interactions of two simulated interlocutors. The author describes the setup of a simulation environment that is capable of simulating human dialogue on the speech level. The impact of delay and bursty packet loss on VoIP conversations is investigated and modeled for the use in the simulation. Based on parameters extracted from simulated conversations, the author proposes extensions to the E-model, a parametric model standardized by the International Telecommunications Union, in order to predict the quality of the simulated conversations. The author shows that predictions based on the simulated conversations outperform models that rely on the transmission parameters alone.

Download or read book Information Security Management Handbook Fifth Edition written by Harold F. Tipton and published by CRC Press. This book was released on 2003-12-30 with total page 2124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since 1993, the Information Security Management Handbook has served not only as an everyday reference for information security practitioners but also as an important document for conducting the intense review necessary to prepare for the Certified Information System Security Professional (CISSP) examination. Now completely revised and updated and in its fifth edition, the handbook maps the ten domains of the Information Security Common Body of Knowledge and provides a complete understanding of all the items in it. This is a ...must have... book, both for preparing for the CISSP exam and as a comprehensive, up-to-date reference.