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WCDMA ran Fundamental

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WCDMA RAN
Fundamental


Copyright © 2008 Huawei Technologies Co., Ltd. All rights reserved.

Objectives
z

Upon completion of this course, you will be able to:
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Describe the development of 3G

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Outline the advantage of CDMA principle

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Characterize code sequence

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Outline the fundamentals of RAN

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Describe feature of wireless propagation

Copyright © 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page1

Contents
1. 3G Overview
2. CDMA Principle
3. WCDMA Network Architecture and protocol structure
4. WCDMA Wireless Fundamental

Copyright © 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page2

Contents
1. 3G Overview
2. CDMA Principle
3. WCDMA Network Architecture and protocol structure
4. WCDMA Wireless Fundamental

Copyright © 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page3

Different Service, Different Technology
2G 1990s
Digital

1G 1980s
Analog
AMPS

GSM
GSM

TACS

CDMA
CDMA
IS-95
IS-95

Technologies
drive

NMT
Others

3G
IMT-2000

UMTS
UMTS
WCDMA
WCDMA
Demands
drive

TDMA
TDMA
IS-136
IS-136

cdma
cdma
2000
2000
TDTDSCDMA
SCDMA

PDC
PDC

3G provides compositive services for both operators and subscribers
Copyright © 2008 Huawei Technologies Co., Ltd. All rights reserved.

z

z

z

z

Page4

The first generation is the analog cellular mobile communication network in the time
period from the middle of 1970s to the middle of 1980s. The most important
breakthrough in this period is the concept of cellular networks put forward by the Bell
Labs in the 1970s, as compared to the former mobile communication systems. The
cellular network system is based on cells to implement frequency reuse and thus
greatly enhances the system capacity.
The typical examples of the first generation mobile communication systems are the
AMPS system and the later enhanced TACS of USA, the NMT and the others. The
AMPS (Advanced Mobile Phone System) uses the 800 MHz band of the analog
cellular transmission system and it is widely applied in North America, South America
and some Circum-Pacific countries. The TACS (Total Access Communication System)
uses the 900 MHz band. It is widely applied in Britain, Japan and some Asian
countries.
The main feature of the first generation mobile communication systems is that they
use the frequency reuse technology, adopt analog modulation for voice signals and
provide an analog subscriber channel every other 30 kHz/25 kHz.
However, their defects are also obvious:
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Low utilization of the...
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Copyright © 2008 Huawei Technologies Co., Ltd. All rights reserved.
WCDMA RAN
Fundamental
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