This document provides an overview of wireless and mobile network technologies from 1G to 3G. 1G networks used analog signals and FDMA, but had poor voice quality, battery life, and no security. 2G networks like GSM introduced digital modulation and used TDMA or CDMA, enabling limited data services but unable to support video. 3G networks allow simultaneous voice and data transfer like music and email over the same network, delivering broadband capacity to support more customers at a lower cost than 2G, using technologies like W-CDMA and UTMS.

1. Wireless and Mobile
Networks:
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2. Concepts:
 Cellular internet access
An overview of cellular network architecture
 3G Cellular Data Networks
Extending the Internet to Cellular subscribers
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3. 1st Generation Technology (1G)
 It was an analog system
 Variations in the signals - disrupts over
long distances
 Average between 4800 & 9600 bps
 It uses FDMA
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4. FDMA
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•Frequency Division Multiple
Access or FDMA is a channel
access method used in
multiple-access protocols as a
channelization protocol.
•FDMA gives users an
individual allocation of one or
several frequency bands,
or channels. Multiple Access
systems coordinate access
between multiple users.

5. Drawbacks of 1G
 Poor voice quality
 Poor battery life
 Phone size is big
 No security
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6. 2nd Generation Technology(2G)
 It uses GSM
 GSM provides voice & limited data
services and uses digital modulation for
improved audio quality
 Demand for Fax & short messages was
growing rapidly
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7. 2G cellular network architecture
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8. 2G technology uses two standards
1. TDMA (Time Division Multiple Access)
2. CDMA (Code Division Multiple Access)
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10. 10

11. Drawbacks of 2G
 Need to improve transmission quality
 Unable to support complex data such as video
 Cell towers has a limited coverage area
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12. 3rd Generation Technology (3G)
 3G networks provide the ability to transfer
voice data & non-voice data (music, emails
& instant messaging) over the same
network simultaneously.
 3G networks deliver broadband capacity &
support greater number of voice & data
customers of lower incremental cost than
2G.
 It uses W-CDMA & UTMS 12

13. 3G system architecture
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14. Thank you
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