Une introduction générale sur 3G

1. 3G
Presented by :
Elyes Arfa
CIT
1st semester
Istitute:
Tek-up

2. contents
• What is 3G?
• Evolution to 3G
• Technical specification
• Different types of 3G
• Devices that uses 3G
• Disadvantages of 3G

4. What is 3G ?
3G stands for third generation, and is a
wireless industry term for a collection of
international standards and technologies
aimed at increasing efficiency and improving
the performance of mobile wireless
networks.

5. Why is it important?
3G wireless services offer enhancements to
current applications, including greater data
speeds, increased capacity for voice and
data and the advent of packet data networks
versus today’s switched networks.

6. evolution to 3G
• The predecessors of 3G are :
• 1G
• 2G

7. 1G
.1G refers to the first generation
of wireless technology wich was
first itroduced in 1980s and
completed in 1990s
.a speed up to 2,4 kbps
.Allows the voice calls in one
country
.uses analog signal

8. disadvantages
• Poor voice quality
• Poor battery life
• Large phone size
• Limited capacity etc…

9. 2g
• Refers to the 2nd generation wich is based
on GSM
• Was launched in 1991
• Uses Digital signals
• Data speed up to 64 kbps

10. disadvantages
• Requires strong digital signals so the
phone can work
• Unable to manage complex data like
videos etc…

11. technical terms of 3g
• The transfer rate for 3G networks is
between 128 and 144 kbps (kilobits
per second) for devices that are
moving fast and 384 kbps for slow
ones. For fixed wireless the speed
goes beyond 2 Mbps

12. technical terms of 3g
• It is comprised of basically the CDMA
( Code Division Multiple Access )
technology
• CDMA uses :
• FDMA ( Frequency Division Multiple
Access)
• TDMA (Time Division Multiple
Access)

13. fdma
• Frequency Division Multiple Access
• Used by the 1st genration (1G)
• Divides the frequency band available into
little segments

15. TDMA
• Time Division Multiple Access
• Used by the 2nd generation (2G)
• The mobile phone system splits up
everyone's calls into little digital parts
• sends each chunk at a slightly different
time down the same frequency channel

17. CDMA
• Code division multiple access
• Used by the 3rd generation (3G)
• Works by splitting calls up into pieces
• giving each piece a code that identifies
where it's going

18. WCDMA
• Basic CDMA evolved into an even
higher-capacity system called
Wideband CDMA (WCDMA), which
sends data packets over a wide band of
radio frequencies so they travel with
less interference, and more quickly and
efficiently

19. Types of 3G
• HSPA ( High speed packet access) :
Composed of HSDPA (High Speed
Downlink Packet Access) and HSUPA
(High Speed Uplink Access)
• HSPA+

20. HspA
• Enables data connection at 3.6 Mbps

21. HspA+ or 3.5G
TeCHnoloGy
• Enables data connection at 7.2 Mbps to
21Mbps

22. What is required for using
3g
• The first thing you require is a device
that is 3G compatible. This is where
the name 3G phone comes from - a
phone that has 3G functionality;
nothing to do with the number of
cameras or the memory it has. An
example is the iPhone 3G.

23. What is required for using
3g
you need to be
subscribed to a
service provider to
get 3G network
connectivity

24. What is required for using
3g
• Your device is connected to the 3G
network through its SIM card (in the case
of a mobile phone) or its 3G data card
(which can be of different types:
USB,etc.), which are both generally
provided by the service provider.

25. disadvantages of 3g
• Huge capital to build 3G infrastructure services
worldwide
• Health impact because of the electromagnetic
waves
• High prices of 3G mobile services
• Takes time for some countries to catch up with this
service

26. thank you!