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CDMA200系统工程
3G CDMA2000 Wireless System Engineering |  | 收藏 | | | 作者 | Samuel C. Yang | | ＩＳＢＮ | ISBN 1-58053-757-x | | 出版日期/版本 | 2004 | | 格式 | ＰＤＦ Adobe Acrobat |
主题内容 | | Over the past few years, many fundamental changes have taken place in wireless
communications that will influence the future of this dynamic field. One phenomenon
driving these changes has been the integration of wireless communication
devices in people’s lives. While the 1990s were the years when wireless voice telephony
became popular, the 2000s should be the time when wireless data applications
are truly un-tethered from homes and offices. As more people adopt wireless communication
devices and applications effected by these devices, the demand on wireless
networks will continue to grow.
Although code division multiple access (CDMA) has become an integral part of
the ensemble of third generation (3G) standards, many wireless network operators
have found the implementation of IS-2000 affords a good balance between cost and
performance of providing 3G services, especially if an operator evolves its network
from IS-95 to IS-2000. As such, IS-2000 has become a popular choice of 3G for
operators around the world, notably in Asia and the Americas.
This book has been written to address the technical concepts of IS-2000. The
focus is on basic issues, and every effort has been made to present the material in an
expository and interesting fashion. One strategy is to utilize examples not to offer
proofs (as they cannot) but to help the reader grasp the fundamental issues at hand.
In this regard, mathematical details and models have an important role but serve as
means to an end. While CDMA is by nature theory-intensive, every attempt is made
to strike a balance between theory and practice. In addition, to minimize the duplication
of foundational material of spread spectrum communications and IS-95, this
book does not describe those introductory concepts (e.g., synchronization of PN
codes) in detail and assumes that the reader is familiar with basic material such as
those found in CDMA RF System Engineering (Samuel Yang, Artech House, 1998).
Furthermore, this book assumes that the reader is familiar with the layered frameworks
of the Internet Model and OSI Model.
In 3G, the system requires the full participation of not only the physical layer
but also medium access control, link access control, and upper layers to provide not
only circuit voice call but also packet data call functions. Hence in 3G, one needs to
focus on the entire system rather than just on a particular layer. To that end, the
book starts with a layer-by-layer treatment of IS-2000. In Chapters 1 to 6, it follows
the protocol layer framework and describes IS-2000 from Layers 1 to 3. Chapter 1
introduces basic concepts and requirements of 3G and highlights key differences
between IS-2000 and IS-95. Chapters 2 and 3 describe physical layers of forward
and reverse links, respectively. The channel structure and functions of different
channels are described in these two chapters. Chapter 4 covers medium access
control and focuses on radio link protocol, signaling radio burst protocol, and system
access. Then, Chapter 5 goes into link access control; this chapter first reviews
the functions of the sublayers of link access control, then it illustrates sublayer processing
on both forward and reverse links. Chapter 6 goes over Layer 3 or upper layer
signaling of IS-2000; the emphasis here is on call processing, state transition, and
mode transitions.
After building the foundation of the structure of an IS-2000 system, the book
proceeds to the systems aspects of IS-2000 in Chapters 7 to 12. Since IS-2000 contains
power control and handoff functions that are superior to those in IS-95-A,
Chapters 7 and 8 describe in detail power control and handoff functionalities,
respectively. Chapter 9 then proceeds to cover system performance and describes
those features adopted by IS-2000 to increase performance such as code management,
turbo codes, and transmit diversity.
Since a CDMA system essentially trades off coverage versus capacity, these
design aspects are presented in Chapters 10 and 11. In particular, Chapter 10 covers
coverage, and Chapter 11 covers capacity. These two chapters contain systematic
developments of key concepts, and necessary mathematical developments are
included where necessary to clarify the material.
Chapter 12 is on network architecture and serves as a capstone on all the chapters
presented thus far. It describes the IS-2000 architecture from a network perspective
and shows how a 3G network differs and evolves from a 2G network. This
chapter introduces how IS-2000 works and interacts with other elements in the network.
Advanced concepts such mobile IP are also introduced here.
The last three chapters concern a special topic that is of particular interest—
1xEV-DO (1x Evolution for Data Optimized), which has gained popularity in
recent years and is designed to work with an IS-2000 system. The topics related
1xEV-DO are included to make the book a more complete reference. Specifically,
Chapter 13 focuses on the top five layers of 1xEV-DO (i.e., application, stream, session,
connection, and security), and Chapters 14 and 15 cover medium access control
and physical layers of forward and reverse links, respectively.
Without a loss generality, this book emphasizes Spreading Rate 1 at 1.25 MHz.
The discussions on Spreading Rate 1 can be readily extended to direct-spread or
multiple-carrier options of wider bandwidths. In addition, throughout the book we
cite specific examples of radio configurations instead of exhaustively describe the
details of every radio configuration. These selective descriptions serve to illustrate
more fully the reason for a particular implementation. Overall, the emphasis of the
book is on the conceptual understanding of the salient points, focusing on the
“how” and “why” instead of the “what.” It is hoped that the mastery of the material
presented will serve as a strong foundation from which readers can further explore
the technology.
This book is intended as a reference for radio frequency (RF) and system engineers,
technical managers, and short-course students who desire to quickly get up to
speed on the essential technical issues of IS-2000. The material covered in the book
is broad enough to serve students of various backgrounds and interests and to allow
teachers much flexibility in designing their course material. As such, this book
should be a good complement to advanced undergraduate or first-year graduate
level courses in wireless communications as well.
Finally, the material presented in this book is given for informational purpose
and instructional value and is not guaranteed for any particular purpose. The publisher
or the author does not offer any warranties or representations and does not
accept any liabilities with respect to the material presented in this book. Furthermore,
as technical information changes quickly, the purchaser of the book or user of
the information contained in this book should seek updated information from other
sources. The publisher or the author assumes no obligation to update or modify the
information, nor does the publisher or the author undertake any obligation to
notify the purchaser of the book or user of the information contained in the book of
any update. The purchase of the book or the use of the information contained in the
book signifies the purchaser’s or user’s agreement to the above. |
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