What exactly do 3G spectrums do?
Third Generation or 3G is a generic term used for the next generation of mobile communication systems.
With 3G spectrums, your mobile can work for you even while you sleep. It sets your travel schedule and checks for jams along your route, whether you take the car/bus or the train. It can double up as cash and plastic money, a one-instrument payment system to pay for your tickets and purchases by simply texting the bank.
It can be your one-stop entertainment box that holds music files, downloads programmes you love while you're on the move.
It can work out what to do with incoming phone calls and messages -- direct voice calls to voicemail when you are in a meeting, for instance, but providing a discreet text summary of the caller and the nature of the call.
What is spectrum?
Spectrum refers to a range of radio frequencies. The bandwidth of a radio signal is the difference between the upper and lower frequencies of the signal.
For example, in the case of a voice signal having a minimum frequency of 200 hertz (Hz) and a maximum frequency of 3,000 Hz, the bandwidth is 2,800 Hz (3 KHz). The amount of bandwidth needed for 3G services could be as much as 15-20 Mhz, whereas for 2G services a bandwidth of 30-200 KHz is used. Hence huge bandwidth is required for 3G.
Image: A visitor uses a mobile phone as he walks past Chinese brands 3G mobile phones displayed at an exhibition in Beijing. | Photograph: Teh Eng Koon/AFP/Getty Images
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