Cellular System in Wireless Communicatiion

                             A cellular network also called  mobile network is a communication network where the last link is wireless. The network is covered over land areas called cells, each served by at least one fixed-location transceiver, known as a cell site or base station. This base station provides the cell with the network coverage which can be used for transmission of voice, data and others. A cell might use a different set of frequencies from neighboring cells, to avoid interference and provide guaranteed service quality within each cell.

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


Wireless or Cellular networks gives many desirable features:


                  More capacity than a single large transmitter, since the same frequency can be used for multiple links as long as they are in different cells
Mobile devices use low power than with a single transmitter or satellite since the cell towers are closer
when Larger coverage area than a single terrestrial transmitter, additional cell towers can be added indefinitely and are not limited by the horizon

Major telecommunications providers have deployed voice and data cellular networks over most of the inhabited land area of the Earth. This allows mobile phones and mobile computing devices to be connected to the public switched telephone network and public Internet. Private cellular networks can be used for research or for large organizations and fleets, such as dispatch for local public safety agencies or a taxicab company.



0 comments:

Post a comment

 
Top