SEMINAR ON GSM & CDMA

PREPARED BY:

ROKAD RAJESH V ROLL NO(6545)

GUIDED BY:K.S.P.

Years

Service type

Multimedia

VoiceAnalog

AMPS

Digital IS 95 IS 136 GSM

IMT 2000

Wireless Internet Mobile system

~ 24kbps ~64kbps ~2Mbps ~20Mbps

1980 1990 2000 2010

1G 2G 3G

4G

Narrow Band Wide Band

Broad BandEvolution Chart

The mobile industry in India is divided between the two technologies GSM and CDMA. While the earlier service providers had accept the GSM technology, the new players have been using CDMA technology.

PDC ,TDMA

It is necessary for us to understand the basic differentiation of the two technologies as they may have an impact on the Forensics.

MOBILE TECHNOLOGY

DIFFERENT TECHNOLOGIES:

The technologies are evaluated on parameters like 1)data transmission capacity, 2)security and 3)radiation levels. See the data transmission of different technologies: Cellular technology Generation Data transmission capacity

GSM 2G 56 Kps CDMA (IS-95B 2.5G 64 Kps - 140 Kps CDMA 2000 3G 2 MBps

HISTORY

CDMA was first used during World War II by the English allies at jamming transmissions. GSM was first introduced in 1991 and GSM was the only mobile communication system present in the market.

simultaneous introduction of essential services in three phases(1991, 1994, 1996) by the Europea telecommunication administrations

ABOUT GSM

GSM is a form of multiplexing, which divides the available bandwidth of the different channels. GSM is a combination of Time and Frequency- Division Multiple Access (TDMA/FDMA).

Each of these carrier frequencies is then divided in time, using a TDMA scheme.

seamless roaming possible

GSM: Mobile Services

• GSM offers – several types of connections:

voice connections,data connections,short message service

– multi-service options (combination of basic services)

>bearer service>suplimentary service

ABOUT CDMA

CDMA is a form of multiplexing , which allows the use of a particular frequency for a number of signals.

It is a cellular technology that uses spread-spectrum techniques.

A-to-D in spread spectrum technology. Audio input is first digitized into binary elements.

ABOUT CDMA(cont..)

• high-performance digital cellular technology • originally developed for US military • endorsed by ITU/CEPT

Classification of CDMA Systems

.

CDMA one

CDMA 2000

IS95 IS95B JSTD 008

Narrow Band

Wide Band

CDMA SYSTEMS

Why CDMA?

• high quality voice service

• high speed data/Internet

• excellent network coverage and capacity

• inherently very secure/difficult to intercept

Multiple Access in CDMA:

– Each user is assigned a unique PN code.

– Users are seperated by code not by time slot and freq slot.

– Each user transmits its information by spreading with unique code.

– Direct Sequence spread spectrum is used.

1. Telephony - Basic Teleservice

2. Other Services - Emergency calling - Voice Messaging

Services Provided By GSM & CDMA

3. Bearer Services - Low Speed data transfer (upto 9.6 Kbps) -Group 3 Fax and Sms 4. Suplementary Services - call offering , call forwarding, call restriction, call waiting, call hold. - Multiparty teleconferencing, special schemes

Services Provided By GSM & CDMA(Cont..)

GSM Subscribers

• today many providers all over the world use GSM(more than 250 countries in Asia, Africa, Europe, Australia,America)

• more than 2.5 billion subscribers

• more than 70% of mobile phones use GSM

• more than 360 billion SMS/year worldwide

CDMA Worldwide Subscribers

Advantages of GSM • Communication – wireless communication; support for voice and data services

• Total mobility – international access

• Worldwide connectivity • High capacity – better frequency efficiency, smaller cells, more customers per cell

Disadvantage of GSM

• reduced concentration while driving • abuse of private data possible • high complexity of the system • several incompatibilities within the GSM standards

ADVANTAGES OF CDMA:

Since bandwidth is the major problem. CDMA has a clear advantage over GSM in these. The number of channels that can be allocated in a given bandwidth is comparatively higher for CDMA than for GSM.

The cost of setting up a CDMA network is also comparatively less than the GSM network.

Comparison BetweenTechnologies

Digital Mobile technology

User’s Dec-02

User’s Dec-03

Growth in2003

% Growth

Share Of Growth

CDMA 145.2 181.0 35.4 24.3% 15.6%

GSM 790.5 970.8 180.3 22.8% 79.5%PDC 60.1 63.1 3.0 5.0% 1.3%

TDMA 107.4 113.0 5.5 5.1% 2.4%

3 GSM(W CDMA)

0.2 2.8 2.6 1708.5% 1.2%

GLOBAL USER BASE

1103.7 1330.6 226.9 20.69% 100%

Bibliography:

www.iec.org www.mobiletech.org www.cdmainfo.com www.gsmmob.com

Thank you

Any query?