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Thursday, 5 February 2015

cellular network

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For the history of mobile phones, including the history of cellular networks, see History of mobile phones.

Top of a cellular radio tower
Part of a series of
antennas
Mounting four omnidirectional antennas American professional base station
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Components [show]
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Amateur Radio Antenna Cellular network farm municipal wireless network masts and towers Hotspot Wi-Fi Wireless Radio
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v t e
A cellular network or the mobile network is a distributed wireless network on land areas called cells, each served by at least one fixed-location transceiver, known as a cell site or base station. In a cellular network, each cell uses a different set of frequencies of neighboring cells to avoid interference and provide guaranteed bandwidth in each cell.

When these cells bind provide radio coverage over a wide geographic area. This allows a large number of portable stations (eg, mobile phones, pagers, etc.) to communicate with each other and with fixed transceivers and telephones anywhere on the network through base stations, even if some of transceivers are moving through more than one cell during transmission.

Cellular networks offer a number of desirable features:

More capacity than a single large transmitter, since the same frequency can be used for multiple connections, as long as they are in different cells
Mobile devices use less energy than with a single transmitter or satellite from cell towers are closer
Larger coverage area than a single terrestrial transmitter from additional cell towers can be added indefinitely and are not limited by the horizon
The main suppliers of telecommunications networks have deployed mobile voice and data in most of the land surface of the Earth inhabited. This allows mobile phones and mobile computing devices to be connected to the public switched telephone network and the Internet. Private cellular networks can be used for research [1] or for large organizations and fleets, such as issuing local public safety agencies or a taxi company. [2]

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