Описание: Since the publication of 'Wireless Video Communications" five years ago, the area of video compression and wireless transceivers has evolved even further. This new edition addresses a range of recent developments in these areas, giving cognizance also to the associated transmission aspects and issues of error resilience. In this revision of 'Wireless Video Communications", substantial new material has been added on areas such as H.264 and MPEG4 coding. The preface has been rewritten and several introductory chapters removed, the title has also been adjusted to reflect the changes made to the original text. Covering compression issues, error resilience, coding delay, implementational complexity and bitrate, the book also looks to give some historical perspective to video communication.
Описание: TCP Performance over UMTS-HSDPA Systems provides a comprehensive study of the effect of TCP both on achieved application bit rate performance and system capacity. The book describes how to reduce, with or without modification of TCP implementations, the effect of wireless networks on TCP. Emphasizing the effect of scheduling to improve TCP performance over wireless systems, the authors focus on the performance of TCP traffic over HSDPA. This text is ideal for advanced undergraduate students, graduate students, and researchers with basic knowledge in wireless networks that are keen on learning more about the UMTS access network evolution and interactions of the wireless link with TCP.
Описание: A comprehensive discussion of multiple access protocols for cellular systems and the consideration of the specific constraints and capabilities of second and third generation systems regarding the multiple access protocols. Beginning by introducing the cellular concept and discussing second and third generation cellular communication systems, including the evolution from these systems to IP-based systems, the authors then identify the requirements for and problems related to multiple access. In accordance with ETSI and 3GPP standards, a split is made into basic multiple access schemes such as CDMA, TDMA and FDMA and multiple access protocols. The pros and cons of CDMA and TDMA for third generation systems are discussed as well as medium access in GSM, GPRS and UMTS, essentially based on R-ALOHA protocols in all these systems. Data access delay and voice dropping performance is assessed and the different UTRA modes are considered. - Provides an accessible text for individuals with little prior knowledge of cellular communication systems or multiple access protocols - Provides an overview of existing material on cellular communications, multiple access protocols and a combination of the two - Presents extensive research carried out by the authors including extended packet reservation multiple access protocols for TDMA, CDMA and hybrid CDMA/TDMA air interfaces, protocol enhancements and modelling of the physical layer A valuable reference resource for researchers and engineers in the field of cellular communications and packet-based communications, as well as postgraduate and research students in this rapidly evolving field.
Описание: Mobile communications bring profound changes to our everyday lives. The launch of 3rd generation mobile systems in 2001 in Japan and from 2002 throughout the rest of the world, will enable us to communicate at anytime and anywhere, by using a variety of services which have up to now only been available to fixed network users. By the end of 2003, there are expected to be over one billion mobile telephones in use around the world, which surpasses the number of fixed telephone lines projected for that date. 7Illustrates the current situation and forthcoming developments of UMTS (Universal Mobile Telecommunication System) 7Outlines the rationale and motives behind the evolution of this new mobile telephony system 7Analyzes the requirements of the UMTS system and describes the radio UTRA (UMTS Terrestrial Radio Access) and the UTRAN (UTRA Network) together with Core Network Issues 7Provides an overview of the new voice, data and multimedia services that will be available to users 7Reviews the current trends that will affect future research and discusses key topics, including SDMA (Space Division Multiple Access) smart antennas and software radio Written in an easily accesible style, UMTS: Mobile Communications for the Future will prove indispensable reading for all those working in the area of mobile communciations.
Описание: LTE can access a very large global market- not only GSM/UMTS operators, but also some cdma operators and potentially fixed network service providers. The large potential market can attract large numbers of companies to the market place thus pushing the economies of scale that in turn enables wide scale LTE adoption with lower costs. This book will be one of the first books to market after the LTE L1 standard is finalised at the end of 2007. It will give a complete overview of LTE for UMTS and includes chapters on MBMS, HSPA Evolution and WiMAX. Chapter 1 gives an overview to LTE with chapter 2 covering the standardization background and process being. The system architecture evolution (SAE) is presented in Chapter 3 and the basics of air interface modulation choices in Chapter 4. Chapter 5 describes 3GPP LTE physical layer solutions and protocol solution is covered in Chapter 6. The mobility aspects are addressed in Chapter 7 and the packet scheduling in Chapter 8. Chapter 9 illustrates the radio and end-to-end performance while the voice performance is addressed in Chapter 10. Chapter 11 shows the operation of Multimedia Broadcast Multicast System (MBMS) and Chapters 12 and 13 describe other wireless broadband solutions: HSPA evolution in 3GPP Releases 7 and 8, and WiMAX based on IEEE and WiMAX forum definitions
Описание: Radio Access Networks for UMTS provides readers with a description of the UMTS radio access network, describing the key subjects in detail and covering all fundamental subjects. Starting with the high-level network architecture, the book describes the flow of data through the network. Content can be divided into three distinct sections: Section 1 provides readers with a detailed understanding of the UMTS radio access network from the perspective of application data and control plane signalling. Explanations are based upon Release 6 of the 3GPPs specifications and some references are made to Release 7 where appropriate. This section includes a description of the protocol stack and radio resource functionality. It also includes information on HSDPA, HSUPA and the Iub transport network, all of which are gaining greater importance in todays network deployments. Section 2 focuses on complete signalling procedures. This will include descriptions of complete message sequences - to demonstrate some of the most common procedures encountered in the field as well as a step-by-step analysis of message content. The most significant phases of each procedure (in terms of network performance) are also identified. Section 3 addresses the more practical issues of system dimensioning and system planning. Link budgets and capacity calculations are described in detail. The most important radio network planning principles are also described in detail in terms of methodology, scrambling code planning, neighbour planning, antenna subsystems, co-sitting, microcells, indoor solutions, repeaters and operating bands.
Описание: Xi Li presents innovative analytical models and algorithms for the dimensioning of the 3G UMTS Radio Access Network (RAN). The proposed analytical models allow efficient and accurate dimensioning for different evolutions of UMTS radio access technologies.
Описание: This text provides a technical history of the development of GSM (Global System for Mobile Communication) standards and the early evolution of UMTS (Univerisal Mobile Telecommunicaitons System). It presents background information and descriptions of the technical features of the GSM standards.
Автор: Taferner Manfred, Bonek Ernst Название: Wireless Internet Access over GSM and UMTS ISBN: 3540425519 ISBN-13(EAN): 9783540425519 Издательство: Springer Рейтинг: Цена: 13089 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Описание: The book provides a comprehensive investigation of the performance and problems of the TCP/IP protocol stack, when data is transmitted over GSM, GPRS and UMTS. It gives an introduction to the protocols used for Internet access today, and also the Wireless Application Protocol (WAP). The basics of GSM, GPRS and UMTS are given, which are necessary for understanding the main topic, TCP performance over GSM, GPRS and UMTS. We describe at length the problems that TCP has when operating over a mobile radio link, and what has been proposed to remedy these problems. We derive the optimum TCP packet length for maximum data throughput on wireless networks, analytically and by simulation. Results on the throughput and various other parameters of TCP over mobile networks are given. This book gives valuable advice to network operators and application programmers to maximize data throughput, and which protocols, transmission modes, and coding schemes to use and which to avoid.
Описание: This book presents in self-contained chapters all aspects of third generation mobile communications. The focus is on the international standards "Universal Mobile Telephony Service (UMTS)" and "International Mobile Telephony (IMT 2000)". Special emphasis is placed on the definition and implementation of new services and multimedia applications.
Описание: This book describes the physical layer of UMTS (Universal Mobile Telecommunication System) which is one of the five members of the IMT-2000 family of standards. It compiles in a clear fashion the main technical features of the physical layer standard together with a description of the basics of digital communications and spread spectrum technology on which UMTS relies. In addition the test cases specified in the standard are described together with their implications on any practical front-end design. The reader will benefit from the standard description which frees him from studying lots of standardization documents. Additional explanations of the standard and especially the test cases will help to better understand the effects on any front-end system design. Many references are provided for readers interested in in-depth treatments of certain topics.
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