Communications that are radio frequency situated have made mobile wireless communications feasible. Radio frequency or RF communications have been around for quite some time. The RF waves produce in many different directions based off the frequency that is being used for communications. Early and popular applications were the radio broadcasting systems around the world. The radio allowed entertainment and educational material to be brought right into our home possible.
The different broadcasting stations were dependent on different frequency ranges, were apparent from the fact that when you wanted to tune to these stations, different frequency bands were to be used. The medium wave and shortwave bands used to be all that there was. This system was limited in mobility. The radio receiver could move anywhere; broadcast stations were static. The police in addition to different emergency services used this kind of communication when they are in the field and need to be mobile. Both the transmitters and receivers could be moved around.
Television on the other side uses a higher frequency, because the receiving stations must be in the site line of the transmitting towers. This system too had limited mobility where the TV receivers were meant to be located at homes of people. The mobile wireless communications field has completely changed thanks to the onset of cellular phones. Like the TV systems, these mobile communications systems depend on higher frequencies. Transmission stations or the base stations (as they are called in cellular communication systems) need to be visible to the phones communicating through the base station towers. The towers help for the visibilty. Higher the tower, larger is the distance from which it can reach the mobile handsets.
The evolution of the cellular and mobile phone systems has brought us into the 3rd generation or 3G system. A fourth generation or the 4G mobile phones have started to launch around the globe. The big change is that mobile phones have turned into computing devices capable of doing so many other things than just being a mode of voice communication. The evolution into 3G and 4G is focused on facilitating this need for communicating data all over the world. The mobile handsets use the mobile wireless communications to be able to connect to the Internet.
While mobile handsets are acquiring computing device-like capabilities, computing devices are evolving to become completely mobile. They bring in data based capabilities, computing features and some calling features. With the latest tablets available mobile wireless communications are consistently changing and adapting.
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