Some argue that Wi-Fi and related consumer technologies will replace cellular
telephone networks such as 3G and GSM. The current generation of Wi-Fi is still
lacking roaming and authentication features (see 802.1x , SIM cards and RADIUS)
and the limited range of Wi-Fi as well as the narrowness of the available
spectrum are holding back its proliferation as 3G replacement.
However, the bandwith and overall capabilities of Wi-Fi are already exceeding
those once promised by 3G cellular telephone standards which lead to the use of
the term 4G being used for Wi-Fi. Companies like Zyxel, SocketIP and Symbol Technologies are already offering
telephony platforms ( Central Office replacements and terminals (phones)) that
use Wi-Fi VoIP. Many vendors are now selling mobile Internet products that link Wi-Fi and
cellular radio system in a more or less transparent way to take advantage of the
benefits of both systems. Future wireless systems are expected to routinely
switch between a variety of radio systems.
The main difference between cellular and Wi-Fi is that the cellular system
uses the licensed spectrum, and Wi-Fi is implemented in unlicensed bands. The
economic basis for its implementation is therefore completely different. The
success of Wi-Fi has made many people look to the unlicensed spectrum as the
future of wireless access, rather than the spectrum licensed and controlled by
large corporations.
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