Wideband TDD

2005-10-31 Technology & Engineering

Author : Prabhakar Chitrapu
Release : 2005-10-31
Genre : Technology & Engineering
Kind : eBook
Book Rating : 10X/5 ( reviews)

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Book Synopsis Wideband TDD by : Prabhakar Chitrapu

Download or read book Wideband TDD written by Prabhakar Chitrapu. This book was released on 2005-10-31. Available in PDF, EPUB and Kindle. Book excerpt: 3rd generation radio systems will be increasingly developed, deployed and operated in the years to come. TDD is one of two main approaches to implementing these 3G systems, so that there will be an increasing need for the engineering community to learn quickly and comprehensively about the TDD technology. As 3G systems become popular, the topics will no doubt be introduced to academic curricula and will also provide a basis for future research. This book provides comprehensive coverage of TDD. It is essentially a Radio Access Network technology and the book embraces the structure of the radio interface as well as the user equipment and network equipment. In addition, Wideband TDD also covers the connection of the TDD Radio Access Network to the 3G Core Network and public switched networks (PSTN) as well as public and private packet networks (Internet and Intranet). Services, applications and performance are also addressed. Finally, TDD is compared with other radio access technologies, namely FDD, TD-SCDMA and WLAN. TD-SCDMA is the Narrowband version of TDD in 3G, and WLAN standards address wireless computer communications. Although there are a number of books published on 3G and UMTS, most of the focus of these books has been on FDD component of 3G. Wideband TDD: Describes all aspects of TDD in a single comprehensive manner Addresses TDD technology, TDD systems and the TDD market place Discusses deployment scenarios and Radio Resource Management for TDD Provides a comparison of TDD with other radio access technologies, namely FDD, TD-SCDMA and wireless LANs This will prove an essential addition to the bookshelf of professional communication and software engineers, development engineers, technical marketing professionals, researchers in industry, wireless equipment vendors such as Siemens, Nokia and InterDigital, operators and service providers. It will also provide a comprehensive overview of TDD for postgraduates who are taking advanced courses in Mobile Wireless communications.

5G Technology

2024-06-04 Technology & Engineering

Author : Harri Holma
Release : 2024-06-04
Genre : Technology & Engineering
Kind : eBook
Book Rating : 033/5 ( reviews)

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Book Synopsis 5G Technology by : Harri Holma

Download or read book 5G Technology written by Harri Holma. This book was released on 2024-06-04. Available in PDF, EPUB and Kindle. Book excerpt: 5G TECHNOLOGY An Essential Insider’s View of the Development Work of 5G Technology Up to Release 18 5G brings new technology solutions to the 5G mobile networks, including new spectrum options, antenna structures, physical layer and protocols designs, and network architectures. 5G Technology: 3GPP Evolution to 5G-Advanced is an accessible and comprehensive resource that offers explanations of 5G specifications and performance evaluations, aspects of device design, practical deployment considerations and illustrative examples from field experiences. With contributions from a panel of international experts on the topic (industry insiders working at the forefront of development), the book presents the main new technology components in 5G and describes the physical layer, radio protocols, and network performance indicators associated with them. It has intentionally been written to cater to individuals at all levels of 5G expertise. Some of the topics of discussion and learning resources in the work include: An easy-to-understand insider’s overview of 5G from editors and authors who are actively working with the 5G development in 3GPP, the forum defining the requirements Deployment aspects, such as site density and transport network, plus exploration into 5G performance aspects, including data rates, coverage, and latency A large number of illustrations including simulation and measurement results of 5G technology performance, plus key 5G procedures Updated information on industrial IoT, radio enhancements in Releases 16 and 17, open RAN and virtualized RAN, 5G verticals and new use cases, and the 5G-Advanced development in Release 18 and outlook towards Release 19 5G Technology: 3GPP Evolution to 5G-Advanced serves as a complete resource for wireless researchers, network planners, lecturers in universities, technology analysts, R&D engineers, application developers, and spectrum regulators who wish to thoroughly understand the latest in 5G technology and get ahead of the curve with regards to its potential applications in a wide variety of industries.

5G System Design

2021-08-11 Technology & Engineering

Author : Wan Lei
Release : 2021-08-11
Genre : Technology & Engineering
Kind : eBook
Book Rating : 039/5 ( reviews)

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Book Synopsis 5G System Design by : Wan Lei

Download or read book 5G System Design written by Wan Lei. This book was released on 2021-08-11. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a detailed pedagogical description of the 5G commercial wireless communication system design, from an end to end perspective, by those that were intimate with its development. The exposition only assumes that the reader is passingly familiar with LTE and builds upon that knowledge. By comparing and contrasting NR with LTE, it allows for quick mastering of 5G. As such it gives concise and highly accessible description of the key technologies in the 5G physical layer, radio access network layer protocols and procedures, how the 5G core and EPC is integrated into the radio access network, how virtualization, slicing and edge computer will fundamentally change the way we interact with the network, as well as 5G spectrum issues. The 2nd edition of this book significantly enhances and updates the first edition by adding 5G security and Release-16 developments. Loosely speaking, 5G Release-15 can be characterized as being optimized for the cellular carrier eMBB service while 5G Release-16 is the beginning of the optimization of 5G for the vertical industries. It mainly focused on the support of the vehicular vertical and Industrial Internet of Things. As such, we have significantly altered the first edition to cover the key features standardized in Release-16 including: URLLC, V2X, IIoT, enhanced MIMO, unlicensed access, positioning, power savings and IAB. On the network side, detailed discussion covers NR security as well as the newly standardized access traffic steering, non 3GPP access switching and splitting features, non 3GPP access network support and private networks. Engineers, computer scientists and professionals from those with a passing knowledge of 4G LTE to experts in the field will find this book to be a valuable asset. They will gain a comprehensive understanding of the end to end 5G commercial wireless system. Advanced-level students and researchers studying and working in communication engineering, who want to gain an understanding of the 5G system (as well as methodologies to evaluate features and technologies intended to supplement 5G) will also find this book to be a valuable resource.

Cellular and mobile communication

Author : Balamurali
Release :
Genre :
Kind : eBook
Book Rating : /5 ( reviews)

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Book Synopsis Cellular and mobile communication by : Balamurali

Download or read book Cellular and mobile communication written by Balamurali. This book was released on . Available in PDF, EPUB and Kindle. Book excerpt: Contents 1 Introductory Concepts 1 1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Evolution of Mobile Radio Communications . . . . . . . . . . . . . . 1 1.3 Present Day Mobile Communication . . . . . . . . . . . . . . . . . . 3 1.4 Fundamental Techniques . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.4.1 Radio Transmission Techniques . . . . . . . . . . . . . . . . . 5 1.5 How a Mobile Call is Actually Made? . . . . . . . . . . . . . . . . . 7 1.5.1 Cellular Concept . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.5.2 Operational Channels . . . . . . . . . . . . . . . . . . . . . . 8 1.5.3 Making a Call . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.6 Future Trends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.7 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2 Modern Wireless Communication Systems 11 2.1 1G: First Generation Networks . . . . . . . . . . . . . . . . . . . . . 11 2.2 2G: Second Generation Networks . . . . . . . . . . . . . . . . . . . . 11 2.2.1 TDMA/FDD Standards . . . . . . . . . . . . . . . . . . . . . 12 2.2.2 CDMA/FDD Standard . . . . . . . . . . . . . . . . . . . . . 12 2.2.3 2.5G Mobile Networks . . . . . . . . . . . . . . . . . . . . . . 12 2.3 3G: Third Generation Networks . . . . . . . . . . . . . . . . . . . . . 13 2.3.1 3G Standards and Access Technologies . . . . . . . . . . . . . 14 2.3.2 3G W-CDMA (UMTS) . . . . . . . . . . . . . . . . . . . . . 14 2.3.3 3G CDMA2000 . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.3.4 3G TD-SCDMA . . . . . . . . . . . . . . . . . . . . . . . . . 18 2.4 Wireless Transmission Protocols . . . . . . . . . . . . . . . . . . . . 19 2.4.1 Wireless Local Loop (WLL) and LMDS . . . . . . . . . . . . 19 2.4.2 Bluetooth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2.4.3 Wireless Local Area Networks (W-LAN) . . . . . . . . . . . . 20 2.4.4 WiMax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2.4.5 Zigbee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2.4.6 Wibree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2.5 Conclusion: Beyond 3G Networks . . . . . . . . . . . . . . . . . . . . 22 2.6 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3 The Cellular Engineering Fundamentals 23 3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.2 What is a Cell? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.3 Frequency Reuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.4 Channel Assignment Strategies . . . . . . . . . . . . . . . . . . . . . 27 3.4.1 Fixed Channel Assignment (FCA) . . . . . . . . . . . . . . . 27 3.4.2 Dynamic Channel Assignment (DCA) . . . . . . . . . . . . . 27 3.5 Hando Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 3.5.1 Factors In uencing Hando s . . . . . . . . . . . . . . . . . . 29 3.5.2 Hando s In Di erent Generations . . . . . . . . . . . . . . . 31 3.5.3 Hando Priority . . . . . . . . . . . . . . . . . . . . . . . . . 33 3.5.4 A Few Practical Problems in Hando Scenario . . . . . . . . 33 3.6 Interference & System Capacity . . . . . . . . . . . . . . . . . . . . . 34 3.6.1 Co-channel interference (CCI). . . . . . . . . . . . . . . . . . 34 3.6.2 Adjacent Channel Interference (ACI) . . . . . . . . . . . . . . 37 3.7 Enhancing Capacity And Cell Coverage . . . . . . . . . . . . . . . . 38 3.7.1 The Key Trade-o . . . . . . . . . . . . . . . . . . . . . . . . 38 3.7.2 Cell-Splitting . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 3.7.3 Sectoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 3.7.4 Microcell Zone Concept . . . . . . . . . . . . . . . . . . . . . 46 3.8 Trunked Radio System . . . . . . . . . . . . . . . . . . . . . . . . . . 47 3.9 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 4 Free Space Radio Wave Propagation 54 4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 4.2 Free Space Propagation Model . . . . . . . . . . . . . . . . . . . . . 55 4.3 Basic Methods of Propagation . . . . . . . . . . . . . . . . . . . . . . 57 4.3.1 Re ection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 4.3.2 Di raction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 4.3.3 Scattering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 4.4 Two Ray Re ection Model . . . . . . . . . . . . . . . . . . . . . . . . 59 4.5 Di raction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 4.5.1 Knife-Edge Di raction Geometry . . . . . . . . . . . . . . . . 64 4.5.2 Fresnel Zones: the Concept of Di raction Loss . . . . . . . . 66 4.5.3 Knife-edge di raction model . . . . . . . . . . . . . . . . . . . 68 4.6 Link Budget Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . 69 4.6.1 Log-distance Path Loss Model . . . . . . . . . . . . . . . . . 69 4.6.2 Log Normal Shadowing . . . . . . . . . . . . . . . . . . . . . 70 4.7 Outdoor Propagation Models . . . . . . . . . . . . . . . . . . . . . . 70 4.7.1 Okumura Model . . . . . . . . . . . . . . . . . . . . . . . . . 70 4.7.2 Hata Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 4.8 Indoor Propagation Models . . . . . . . . . . . . . . . . . . . . . . . 72 4.8.1 Partition Losses Inside a Floor (Intra- oor) . . . . . . . . . . 72 4.8.2 Partition Losses Between Floors (Inter- oor) . . . . . . . . . 73 4.8.3 Log-distance Path Loss Model . . . . . . . . . . . . . . . . . 73 4.9 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 4.10 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 5 Multipath Wave Propagation and Fading 75 5.1 Multipath Propagation . . . . . . . . . . . . . . . . . . . . . . . . . . 75 5.2 Multipath & Small-Scale Fading . . . . . . . . . . . . . . . . . . . . 75 5.2.1 Fading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 5.2.2 Multipath Fading E ects . . . . . . . . . . . . . . . . . . . . 76 5.2.3 Factors In uencing Fading . . . . . . . . . . . . . . . . . . . . 76 5.3 Types of Small-Scale Fading . . . . . . . . . . . . . . . . . . . . . . . 77 5.3.1 Fading E ects due to Multipath Time Delay Spread . . . . . 77 5.3.2 Fading E ects due to Doppler Spread . . . . . . . . . . . . . 78 5.3.3 Doppler Shift . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 5.3.4 Impulse Response Model of a Multipath Channel . . . . . . . 80 5.3.5 Relation Between Bandwidth and Received Power . . . . . . 82 5.3.6 Linear Time Varying Channels (LTV) . . . . . . . . . . . . . 84 5.3.7 Small-Scale Multipath Measurements . . . . . . . . . . . . . . 85 5.4 Multipath Channel Parameters . . . . . . . . . . . . . . . . . . . . . 87 5.4.1 Time Dispersion Parameters . . . . . . . . . . . . . . . . . . 87 5.4.2 Frequency Dispersion Parameters . . . . . . . . . . . . . . . . 89 5.5 Statistical models for multipath propagation . . . . . . . . . . . . . . 90 5.5.1 NLoS Propagation: Rayleigh Fading Model . . . . . . . . . . 91 5.5.2 LoS Propagation: Rician Fading Model . . . . . . . . . . . . 93 5.5.3 Generalized Model: Nakagami Distribution . . . . . . . . . . 94 5.5.4 Second Order Statistics . . . . . . . . . . . . . . . . . . . . . 95 5.6 Simulation of Rayleigh Fading Models . . . . . . . . . . . . . . . . . 96 5.6.1 Clarke's Model: without Doppler E ect . . . . . . . . . . . . 96 5.6.2 Clarke and Gans' Model: with Doppler E ect . . . . . . . . . 96 5.6.3 Rayleigh Simulator with Wide Range of Channel Conditions 97 5.6.4 Two-Ray Rayleigh Faded Model . . . . . . . . . . . . . . . . 97 5.6.5 Saleh and Valenzuela Indoor Statistical Model . . . . . . . . 98 5.6.6 SIRCIM/SMRCIM Indoor/Outdoor Statistical Models . . . . 98 5.7 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 5.8 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 6 Transmitter and Receiver Techniques 101 6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 6.2 Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 6.2.1 Choice of Modulation Scheme . . . . . . . . . . . . . . . . . . 102 6.2.2 Advantages of Modulation . . . . . . . . . . . . . . . . . . . . 102 6.2.3 Linear and Non-linear Modulation Techniques . . . . . . . . . 103 6.2.4 Amplitude and Angle Modulation . . . . . . . . . . . . . . . 104 6.2.5 Analog and Digital Modulation Techniques . . . . . . . . . . 104 6.3 Signal Space Representation of Digitally Modulated Signals . . . . . 104 6.4 Complex Representation of Linear Modulated Signals and Band Pass Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 6.5 Linear Modulation Techniques . . . . . . . . . . . . . . . . . . . . . 106 6.5.1 Amplitude Modulation (DSBSC) . . . . . . . . . . . . . . . . 106 6.5.2 BPSK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 6.5.3 QPSK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 6.5.4 O set-QPSK . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 6.5.5 =4 DQPSK . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 6.6 Line Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 6.7 Pulse Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 6.7.1 Nyquist pulse shaping . . . . . . . . . . . . . . . . . . . . . . 112 6.7.2 Raised Cosine Roll-O Filtering . . . . . . . . . . . . . . . . 113 6.7.3 Realization of Pulse Shaping Filters . . . . . . . . . . . . . . 113 6.8 Nonlinear Modulation Techniques . . . . . . . . . . . . . . . . . . . . 114 6.8.1 Angle Modulation (FM and PM) . . . . . . . . . . . . . . . . 114 6.8.2 BFSK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 6.9 GMSK Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 6.10 GMSK Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 6.11 Two Practical Issues of Concern . . . . . . . . . . . . . . . . . . . . 121 6.11.1 Inter Channel Interference . . . . . . . . . . . . . . . . . . . . 121 6.11.2 Power Ampli er Nonlinearity . . . . . . . . . . . . . . . . . . 122 6.12 Receiver performance in multipath channels . . . . . . . . . . . . . . 122 6.12.1 Bit Error Rate and Symbol Error Rate . . . . . . . . . . . . . 123 6.13 Example of a Multicarrier Modulation: OFDM . . . . . . . . . . . . 123 6.13.1 Orthogonality of Signals . . . . . . . . . . . . . . . . . . . . . 125 6.13.2 Mathematical Description of OFDM . . . . . . . . . . . . . . 125 6.14 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 6.15 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 7 Techniques to Mitigate Fading E ects 129 7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129 7.2 Equalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 7.2.1 A Mathematical Framework . . . . . . . . . . . . . . . . . . . 131 7.2.2 Zero Forcing Equalization . . . . . . . . . . . . . . . . . . . . 132 7.2.3 A Generic Adaptive Equalizer . . . . . . . . . . . . . . . . . . 132 7.2.4 Choice of Algorithms for Adaptive Equalization . . . . . . . . 134 7.3 Diversity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 7.3.1 Di erent Types of Diversity . . . . . . . . . . . . . . . . . . . 137 7.4 Channel Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143 7.4.1 Shannon's Channel Capacity Theorem . . . . . . . . . . . . . 143 7.4.2 Block Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 7.4.3 Convolutional Codes . . . . . . . . . . . . . . . . . . . . . . . 152 7.4.4 Concatenated Codes . . . . . . . . . . . . . . . . . . . . . . . 155 7.5 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 7.6 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 8 Multiple Access Techniques 157 8.1 Multiple Access Techniques for Wireless Communication . . . . . . . 157 8.1.1 Narrowband Systems . . . . . . . . . . . . . . . . . . . . . . . 158 8.1.2 Wideband Systems . . . . . . . . . . . . . . . . . . . . . . . . 158 8.2 Frequency Division Multiple Access . . . . . . . . . . . . . . . . . . . 159 8.2.1 FDMA/FDD in AMPS . . . . . . . . . . . . . . . . . . . . . 160 8.2.2 FDMA/TDD in CT2 . . . . . . . . . . . . . . . . . . . . . . . 160 8.2.3 FDMA and Near-Far Problem . . . . . . . . . . . . . . . . . 160 8.3 Time Division Multiple Access . . . . . . . . . . . . . . . . . . . . . 161 8.3.1 TDMA/FDD in GSM . . . . . . . . . . . . . . . . . . . . . . 161 8.3.2 TDMA/TDD in DECT . . . . . . . . . . . . . . . . . . . . . 162 8.4 Spread Spectrum Multiple Access . . . . . . . . . . . . . . . . . . . . 163 8.4.1 Frequency Hopped Multiple Access (FHMA) . . . . . . . . . 163 8.4.2 Code Division Multiple Access . . . . . . . . . . . . . . . . . 163 8.4.3 CDMA and Self-interference Problem . . . . . . . . . . . . . 164 8.4.4 CDMA and Near-Far Problem . . . . . . . . . . . . . . . . . 165 8.4.5 Hybrid Spread Spectrum Techniques . . . . . . . . . . . . . . 165 8.5 Space Division Multiple Access . . . . . . . . . . . . . . . . . . . . . 166 8.6 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166 8.7 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

WCDMA for UMTS

2007-09-27 Technology & Engineering

Author : Harri Holma
Release : 2007-09-27
Genre : Technology & Engineering
Kind : eBook
Book Rating : 524/5 ( reviews)

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Book Synopsis WCDMA for UMTS by : Harri Holma

Download or read book WCDMA for UMTS written by Harri Holma. This book was released on 2007-09-27. Available in PDF, EPUB and Kindle. Book excerpt: Written by the leading experts in the field, the best selling book on UMTS is now updated to cover 3GPP High Speed Packet Access (HSPA) evolution (HSPA+) in Release 7 and on-going Long Term Evolution (LTE) activity for Release 8. These technologies enhance the capabilities of the existing WCDMA/HSPA networks to offer higher data rates beyond 100 Mbps. WCDMA for UMTS, Fourth Edition also covers 3GPP WCDMA Release 99, High Speed Downlink Packet Access (HSDPA) in Release 5 and High Speed Uplink Packet Access (HSUPA) in Release 6, which are already deployed commercially. Multimedia Broadcast Multicast System (MBMS) is also described in detail. Key updates include: * Continues to provide both updated descriptions of the 3GPP standard as well as the latest end user and system performance estimates * Updated HSDPA and HSUPA, including link budgets and Iub dimensioning * Detailed MBMS description * 3GPP Release 7 HSPA evolution full description * 3GPP Release 8 LTE overall description and 3GPP schedule * Dedicated chapter on terminal design challenges for the new high speed radio technologies

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