Need of 4G

     NEED OF 4G

     Now, the question arises... Why was 4G needed??? What led to its advent???

Well.. The answer is pretty simple.. The various drawbacks of the older generations of mobile communication system led to the advent of "4G mobile communication system"..

So here is a brief description about the various generations and their drawbacks.

1st Generation:-

1G was an analog system and was developed in the 70s.

First 1G mobile system Advance Mobile Phone System (AMPS) was launched by the US. It was based on FDMA that allowed users to make voice calls in 1 country.

Drawbacks-
Poor voice quality
Poor battery life
Large phone size
No security
Frequent call drops
Limited capacity and poor hand-off reliability

2nd Generation:-

2G phones use Global System for Mobile communications (GSM) and were first used in the early 90s in Europe.

GSM provides voice and limited data services and uses digital modulation for improved audio quality.

2G cellular system includes GSM, Digital AMPS (D-AMPS), Code-Division Multiple Access (CDMA), and Personal Digital Communication (PDC).

A new air interface called Enhanced Data GSM Environment (EDGE) has been developed specifically to meet the bandwidth needs of 3G. EDGE is a faster version of GSM wireless service.

3rd Generation:- 

The first pre-commercial trial network with 3G was launched by NTT DoCoMo in Tokyo (Japan) in May 2001. NTT DoCoMo launched the first commercial 3G network on 1 October 2001, using the WCDMA technology.

The idea behind 3G was to have a single network standard instead of the different types adopted in the US, Europe, and Asia. Telecommunications System (UMTS) or IMT-2000, sustained higher data rates and opened the door to many Internet style applications.
 

3G technology adds multimedia facilities to 2G phones by allowing video, audio, and graphics applications. Over 3G phones, you can watch streaming video or have video telephony

Drawbacks-

• High bandwidth spectrum requirement
• High licensing fees
• Expensive