In a cellular communication system a geographical area as subdivided into small regions where each small region is called as a cell
A basic cellular system consist of three parts as listed below
- a mobile unit
- a cell site
- a mobile telephone switching office (MTSO)
The mobile unit (Mobile Telephone) contains a control unit, a transceiver (combination of transmitter and receiver) and on antenna sister.
Whenever a mobile unit wants to step a call it contents the cell site of the particular cell in which it exists at that time.
The cell site consists of control unit, antennas power plant and data terminals.
The cell site is infecting acting as an interface to the MTSO.
After the mobile unit contacts the cell site, the cell site in contacts the MTSO which processes the call further depending on whether it is a mobile to mobile call or mobile to fixed station call.
A little thought from the reader will indicate that a fixed subscriber to mobile call originates through the telephone exchange and passes through the MTSO and cell site towards the mobile unit.