How Does GSM Work?
Since GSM is connected in a cellular network, mobile phones can connect to the system by way of cells that may be in their area. GSMs usually operate using four radio frequencies: 850 MHZ, 900 MHz, 1800 MHz, and 1900 MHz. Also GSMs use four cell sizes: macro, micro, pico, and umbrella. The macro cells are normally referred to as cells that have the base station antenna installed on some kind of mast or on the building somewhere. So if you see an antenna on top of a building, this may be the macro cell. The micro cell is considered the antenna that is installed below the roof. These types are usually found in urban areas. Pico cells are basically found inside buildings. The umbrella cell is used to cover smaller cells and help fill in gaps in coverage where the smaller cells can’t reach. So how does it work? Well when a customer places a call using his/her cell phone, GSM uses a process called circuit switching. This method of communication allows a path to be established between two de
