The technology

The technology

 

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Cellular telephone systems use a unique kind of switching. In a major metropolitan area, a cellular service might involve 10 or 20 transceiver antennas, all linked by land lines to a switching subsystem that may be centrally located or distributed over the serving area according to traffic needs. The switching subsystem connects each call to a central-office switch that is part of the standard telephone network. The cellular system switch oversees cell site operations, sets up and disconnects calls, and records call details for billing. The network of cell sites keeps track of the location of the moving telephone being used in a call in progress, determining when the call should be moved from one cell area to another while maintaining the proper radio-transmission quality.

 

 

Fundamental Concepts in Cellular Technology

The radio spectrum contains many bands that are allocated and used for commercial, personal, and military applications. Fifty (50) MHz of spectrum allocated to cellular networks exists in the 824-849 MHz and the 869-894 MHz bands (Pagett, 1995). These bands are then further subdivided into 832 channels allowing many users in the same area to simultaneously access the network (DeBelina, 1995).

 

 

SWITCHING

The switch is a mechanism that connects a telephone to any othertelephone without requiring a special pair of wires between onlythose two telephones.

 

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