The 21st Century Technology 3G is useful in transfer of more information, faster data access and multimedia services through mobile phones. 3G is the third generation of tele standards and technology for mobile networking, superseding 2.5G. It is based on the International Telecommunication Union (ITU) family of standards under the IMT-2000. It’s a technology apprehensively expected by mobile users in all over the world.
3G networks enable network operators to offer users a wider range of more advanced services while achieving greater network capacity through improved spectral efficiency. Services include wide-area wireless voice telephony, video calls, and broadband wireless data, all in a mobile environment. Additional features also include HSPA data transmission capabilities able to deliver speeds up to 14.4 Mbit/s on the downlink and 5.8 Mbit/s on the uplink.
Unlike Wi-Fi or WLAN networks, 3G networks are wide-area cellular telephone networks that evolved to incorporate high-speed Internet access and video telephony. Wi-FI networks are short range, high-bandwidth networks primarily developed for data.
Meaning of Spectrum
Radio 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, for 3G huge bandwidth is required.
Now you can understand why 3G spectrum has become such a precious and scarce resource in the Technology age – everybody from Media broadcasters to the Mobile companies wants spectrum, and it is in short supply.
Benefits of 3G Technology
3G services will enable video broadcast and data-intensive services such as stock transactions, e-learning and telemedicine through wireless communications in a fast speed. That’s why all telecom operators are waiting to launch 3G in India to cash in on revenues by providing high-end services to customers, which are voice data and video enabled. for more information see below
http://24x7technology.blogspot.com/2009/08/new-technology-3g-spectrum.html