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1
Setyo Budianto
Manager O&M Network [email protected]
www.setyobudianto.com
Seminar Teknologi GSM vs CDMA
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Content
Wireless World Market
CDMA Technology Overview
CDMA Technology Evolution
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Wireless Subscriber in The World
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Key Drivers For Wireles Market Expansion
CDMA2000
WCDMA
CDMA2000
WCDMA
More Capacity, High Speed Data
Capacity/Quality
Roaming
Mobility
AMPS
TDMA/GSM
cdmaOne
IS-95A
cdmaOne
IS-95 B
GPRS
cdmaOne
IS-95 B
GPRS
Medium Speed Data
Time
Multi-ModeMulti-Mode
CDMA-GSMCDMA-GSM
Global Roaming
1G 2G 3G2.5G
Multi-BandMulti-Band
Multi-
Network
Multi-
Network
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Worldwide 2G and 3G Subscriber Trends
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Wireless Handset in India
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CDMA Technology Overview
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FDMA (Frequency Division Multiple Access)
TDMA (Time Div ision Multiple Access)
CDMA (Code Division Multiple Access)
1 user/narrowband channel
4.8 TCH/Mhz/Cell
Capacity depends much on spectrum
8 Users/Narrowband Channel10.0 TCH/Mhz/Cell
Capacity depends much on spectrum
N Users/Wideband Channel
8 kbps vocoder : mobile 56.1 TCH/Mhz/Cell
fixed 86.2 TCH/MHz/Cell
13 kbps vocoder : mobile 29.6 TCH/Mhz/Cell
Capacity depends much on noise level
Multiple Access Technology
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A room with several pairs of people withdifferent language
The air in the room is the carrier
The language is the coding system
Other languages are heard as noise
New pairs can join to talk in the same roomuntil it is too noisy
If people whisper, more conversation can takeplace
CDMA - How does coding work?
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4 site,12 frequency
repeat
1
11
1
11
111
1
11
1
11
1
11
1
11
111
1
11
1
11
1
11
1
11
1
11
111
1
11
N=1frequency repeat
6543
21
8
79
121011
6
54
3
21
8
79
12
1011
6
54
3
21
87912
1011
6
54
3
21
8
79
12
1011
GSMGSM CDMACDMA
CDMA nearly eliminates cost of
frequency planning
Frequency Planning
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The mobile unit is monitored by two or more cell sites
Comparing the best quality frames on frame-by-frame
basis
Take advantage of the moment-by-moment changes
Minimizing drop call and noise during handoffs
Soft Handoff
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CDMA Power Control Ensures equal receive power from all subscribers
avoids "near-far" problem
Forward and reverse link power control
MS power measured at cell site and MS is commanded
to change power in small steps (1.25 msec)
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Path Diversity
Receiver
Receiver
Receiver
Rake Receiver
GSM
Fading
D/A Audio
Fading
D/AReceiver
CDMA
Effects of fading are mitigated through use of multiple receivers that sum radio signals from
different cells and from reflected rays.
Fading is more likely to cause loss of information =lower speech quality
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Frequency Diversity
Outgoing Waveform
-80 dB
-90 db
-110 db
-120 db
1.25 MHz
1.25 MHz
This 400 kHz fade of 12 dB only affects 1/3 of CDMA bandwidth.
Therefore, total fade to CDMA user is 2 dB
Received Waveform
-80 dB
-90 dB
-110 dB
-120 dB
12 dB Fade
2 dB LossCDMA
The entire 30 kHz Channel of TDMA is affected by this same fade.
Therefore, total fade to end user is 12 dB
30 kHz
Outgoing Waveform
-80 dB
-90 dB
-110 dB
-120 dB
30 kHz
Received Waveform
-80 dB
-90 dB
-110 dB
-120 dB
12 dB Fade
12 dB LossTDMA
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CDMA 2000 Network Architecture
Circuit Switched Network
MSC
R
AAAServer
HLRWIN
BTS1
BSC1
R
InternetInternet
PC
MS
Application Server
HA
MS
PDSN/FA
PSTNPSTN
Packet Switched Network
IWF
VMS SMS
BTS2
BSC2
RAN
ATM
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CDMA Technology Evolution
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Wireless Services Trend
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The 3G Choice is CDMA
IMT-2000 Standard
• 2 Mbps in fixed or in-building environments
• 384 kbps in pedestrian or urban environments
• 144 kbps in wide area mobile environments
• Variable data rates in large geographic area systems
(satellite)
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200620052004200320022001200019991995 200620052004200320022001200019991995
In -Band Migration and
Designed forIn-Band Migration andNew Spectrum
3G CDMA
2G CDMA
1.25 MHz
Voice & Data
2.5G CDMA
Rel. 4
HSDPA
Additional voice capacity doubling
- Terminal antenna diversity
Rel. 5
CDMA2000 1X
14.4 kbps data
Soft Handoff
SynchronousTiming
64 kbps packetdata
− Channel
Concatenation
Double voice capacity− Fast Fwd Power Control
− Coherent Uplink
153.6 kbps packet data− Turbo Codes
307 kbpspacket data
Simultaneousvoice and data
Dedicated & OptimizedFor Packet Data2.4 Mbps Peak RatesAll IP Architecture
Improvementsto dataservices.
More flexibledata packet
scheduling.
64/384 kbps cs/packet data
Soft handoff
Asynchronous timing
Improvements
to data services
More flexible data
packet scheduling
cdmaOne
QoS,Broadcast,Personal
Media, IMM ,2x
1xEV-DV
Forward Link:Peak Rate:3.1 mbps
Reverse Link:Peak Rate:
1.8 mbps
Fwd & Rev. Capacity GainsForward Link: Peak Rate 3.1 mbps
Reverse Link: Peak Rate 1.8 mbps
HSUPA
Rel. 6
Enhanced
Up-Link
IS - 95A IS-95B
1.25 MHzOptimized for Data
IS-2000 Rel. 0 Rel. A Rel. B Rel. C Rel. D
Designed for
New Spectrum
5 MHz
Voice & Data
3GPP Rel. 99
CDMA2000 1xEV-DO
UMTS
(WCDMA)
IS-856, Rel. 0 Enhancements Rel. A
3G CDMA Evolution
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Mobile Service Evolution
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CDMA2000 Deployment
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CDMA Terminals
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