3. WHAT IS 3G…….???
3G, short for third Generation, is the third generation
of mobile telecommunications technology.
3G technology is the result of ground-breaking research and
development work carried out by the International
Telecommunication Union (ITU) in the early 1980s.
The Third Generation (3G) digital mobile multimedia offering
broadband mobile communications with voice, video, graphics,
audio and other information.
3G telecommunication networks support services that
provide an information transfer rate of at least 200 kbyte/s.
4. (1G) Analog:
Analog phones helped to make voice calls inside
one's country without roaming facilities.
(2G) Digital :
Mobile phone systems added fax, data and messaging
capabilities as well as voice telephone service in many
countries offering worldwide roaming.
(3G) Multimedia services:
Add high speed data transfer to mobile devices, allowing
new video, audio and other applications (including Internet
services) through mobile phones.
5.
6.
7. 1. With 3G, the information is
split into separate but related
packets before being transmitted and
reassembled at the receiving end.
2. The World Wide Web (WWW) is
becoming the primary communications
interface. People access the Internet for
entertainment, services, and information
collection, the intranet for accessing
enterprise information and connecting with
colleagues and the extranet for accessing
customers and suppliers.
9. Simplex: Using a walkie-talkie you
have to push a button to talk oneway. Of course, this is not how
mobile phones work. Mobile
phones allow simultaneous twoway transfer of data - a situation
known as duplex (if more than two
data streams can be transmitted, it
is called multiplex):
Duplex: Allows simultaneous
two-way data transfers.
The communication channel
from the base station to the
mobile device is
called the downlink, and the
communication from the
mobile device back to the base
station is called the uplink.
10. • FDD: Uses paired spectrum - one
frequency band for the uplink,
• TDD: Duplex communications can
also be achieved in time rather than
by frequency. In this approach, the
uplink and the downlink operate on
the same frequency, but they are
switched very rapidly one moment
the channel is sending the uplink
signal, the next moment the channel
is sending the downlink signal.
Because this switching is performed
very rapidly. This is called Time
Division Duplex, or TDD. TDD
requires a guardtime instead of a
guard band between transmit and
receive streams.
11. .
TDMA
TDMA is Time Division Multiple Access. It
works by dividing a single radio
frequency into many small time slots.
Each caller is assigned a specific time
slot for transmission.
CDMA
CDMA is Code Division Multiple
Access. CDMA works by giving
each user a unique code. The
receiver has knowledge of the
sender's unique code, and is
therefore able to extract the
correct signal no matter what the
frequency
12. The 3G network might be divided up in hierarchical fashion:
• Macro cell - The area of largest coverage, e.g., an entire city.
• Micro cell - The area of intermediate coverage, e.g., a city
centre.
• Pico cell - The area of smallest coverage, e.g., a "hot spot"
in a hotel or
airport.
smaller regions (shorter ranges) allow higher user density and faster
transmission rates. This is why they are called "hot spots".
13. 3G
mobile networks can support lots more subscribers
s and let them download data much faster. On current
GSM networks data chugs around at 9.6 kilobits per
second (kbps).
On current GSM networks data chugs around at 9.6
kilobits per second (kbps).
By contrast the upper limit for 3G networks is 2 megabits
per second if you are standing still and 384 kbps for those
on the move.
Plus it has Global Positioning feature.
14.
15. • Wireless Internet
• Audio on demand
• Electronic postcards
• Video conferencing
• Secure mobile
commerce
transactions
• Traffic and traveling
information - location
specific
16. BIBLIOGRAPHY
We express our heartiest acknowledgement to Sarmistha
Basu Ma’am .
Also,the presentation could not not possible without
the help of :
1. http://en.wikipedia.org
2. timesofindia.indiatimes.com
3. www.google.com
