4G is the fourth generation of wireless mobile telecommunications technology

1. Mudasir Ahmad Bhat

2. 4G Definition
4G is the fourth generation of wireless mobile
telecommunications technology, succeeding
3G. A 4G system must provide capabilities
defined by ITU in IMT Advanced.
4G Networks are projected to provide speed of
100Mbps while moving and 1Gbps while
stationary.

3. 3G Technology
Large capacity and broadband capabilities
Allows the transmission of 384kbps for mobile
systems and up to 2Mbps
Increased spectrum efficiency –5Mhz
A greater number of users that can be simultaneously
supported by a radio frequency bandwidth
High data rates at lower incremental cost than 2G–
Global roaming

4. Previous Technology - 3G
CDMA –Code Division Multiple Access
Form of multiplexing
Does not divide up the channel by time or frequency
Encodes data with a special code associated with each
channel

5. Code Division Multiple Access

6. IMT-Advanced requirements
Be based on an all-IP packet switched network.
Have peak data rates of up to approximately 100
Mbit/s
Be able to dynamically share and use the network
resources.
Use scale-able channel bandwidths of 5–20 MHz.
The ability to offer high quality of service for next
generation multimedia support,
LTE Advanced standardized by the 3GPP
802.16m standardized by the IEEE (i.e. WiMAX)

7. Types of Multiplexing
FDMA – Frequency Division Multiple Access
Each phone call is allocated one frequency for the
entire duration of the call

8. Types of Multiplexing
TDMA - Time Division Multiple Access
Each phone call is allocated a spot in the frequency for
a small amount of time, and "takes turns" being
transmitted

9. Types of Multiplexing
CDMA - Code Division Multiple Access
Each phone call is uniquely encoded and transmitted
across the entire spectrum, in a manner known as
spread spectrum transmission

10. Reasons for New Research
Even though 3G has successfully been introduced
to mobile users, there are some issues that are
debated by 3G providers and users.
High input fees for the 3G service licenses
Great differences in the licensing terms
3G phones are expensive

11. Fourth Generation

12. What is 4G?
Fourth Generation Technology
Faster and more reliable
100 Mb/s
Lower cost than previous generations
Multi-standard wireless system
Bluetooth, Wired, Wireless
Ad Hoc Networking
IPv6 Core
OFDM used instead of CDMA
Potentially IEEE standard 802.11n
Most information is proprietary

13. 4G Architecture

14. Communications Architecture
Personal Layer Gateway:
devices that connect to upper layers; cell phone, fax,
voice, data modem, MP3 players, PDAs
Info-Sensor layer:
environmental sensors
Fiber-optic wire layer:
high speed subterranean labyrinth of fiber optic cables
and repeaters

15. Ad Hoc Networks
 Spontaneous self
organization of networks of
devices
 Not necessarily connected to
internet
 4G will create hybrid wireless
networks using Ad Hoc
networks
 Form of mesh networking–
Very reliable

16. Enhance Mobile Gaming
Experience enhance wireless capabilities that
deliver mobile gaming interaction with less
than five seconds
Play online multi player games while traveling
at high speeds or sitting outside

17. Broadband access in Remote
location
4G will provide a wireless alternative for broadband
access
I will provide first opportunity for broadband access
in remote locations without an infrastructure to
support cable or DSL access.

18. Key features
MIMO (multi-antenna and multi-user).
Frequency-domain-equalization for example multi-carrier
modulation (OFDM) in the downlink.
Frequency-domain statistical multiplexing,
Turbo principle error-correcting codes: To minimize the
required SNR at the reception side
Channel-dependent scheduling: To use the time-varying
channel
Link adaptation: Adaptive modulation and error-
correcting codes
Mobile IP utilized for mobility