Mobile phones connection can be enabled by radio telecommunication resources and their operation usually follows the operation of fixed telephone networks. The final assembly consists of:
One of the most fundamental principles applied in modern mobile telecommunication systems is based on dividing of the operated territory into partial elemental areas called as cells, which are always served by a particular base station.
The size of cells used in various mobile systems depends primarily on the type and purpose of the mobile system and can be classified as follows:
Cellular structure of the GSM network is usually created by using macrocells with a diameter of up to few kilometres. Example of radio coverage of the territory based on the cellular principle is shown in previous figure. For cellular mobile network structure, a frequency planning is necessary. Frequency plan is working with three or seven frequencies. The same frequencies (f1 to f3, or f1 to f7) can be used in any cluster. The area of all three or seven cells cluster is approximately equal to the average interference zone.