The reutilizao of frequencies works in beehive form, that is, an attendance area is divided in cells of hexagonal format, being that each one of them possesss a set of different frequencies of the neighboring area. In such a way, the next cells can use one same frequency without it has interference or it loses the signal. An established time the linking, the user can be dislocated for any point that the change of a cell for another one will be automatic The cellular system is composed for: Cellular or terminal furniture, the system also is with rank per Stations of Rdio Base (ERB) that the responsibility is had to send and to receive signals that they see of the cellular ones. Each cell possesss Stations of Radio Base that is linked to a Central office of Commutation and Control (CCC). This central office decides the canals conversational of the Mobile System that will be connected with the system of Public Telephony, for comumente conventional mean who supervises and controls all the calls for inside or for is of the system. figure below represents the communication between the components. 3 THE EVOLUTION OF THE CELLULAR ONES With the minimizao of the electronic components, manufacture of colorful screens and sizes bigger and batteries of duration the many longest ones had revolutionized the mobile telephony.
Innumerable innovations and modifications had been added in the technology used for the cellular devices since that Motorola presented its archetype of the first cellular telephone. Below I will trace a chronology with some cellular devices since its first archetype until the devices of the current days. 4 Evolution of the Generations In the first generation, the service of mobile telephony started to function through the delimitation of one determined local one in small called areas cells, being each one of them functions with its proper set of transmitting and receiving radios of low power.