Cellular architecture is constituted of the following −
A network of cells each with a base station.
A packet switched network for communication between the base stations and mobile switching centers.
The public switched telephone network to connect subscribers to the wider telephony network
In all cellular systems, land area is divided into a number of cells each with its radio service. In AMPS the area is large which in digital services, the area is much smaller.Conventionally cells are hexagonal in shape.Each cell uses a frequency range that is not used by its adjacent cells. However frequencies may be reused in non-adjacent cells.
At the centre of each cell is a base station through which mobile phones and other mobile devices transmit data and voice.
The following diagram represents the configuration.
A mobile switching centre (MSC) is a network switching subsystem of a cellular phone system. It is also called mobile telephone switching office (MTSO). All base stations are connected to an MSC.
The functions of MSC are −
Call set-up and release.
Routing of calls and messages sent via SMS.
Managing conference calls and calls on hold.
Interfacing with other networks like public switched telephone network (PSTN) and Internet.