Everything we should know about mobile telephony
Learn everything about Mobile Telephony!
Necessary information about Mobile Telephony
The operation of mobile telephony in Greece, like in most countries of the world, is based on the GSM (Global System for Mobile Communications), which was created in 1987 under the Single European Telecommunications Policy. The EuropeanGSM system determines the frequency bands, which are at 900 and 1800 MHz, as well as the protocols for transmitting mobile telephony telecommunication signals.
With the evolution of technology and the increasing telecommunications needs, the mobile telephony companies currently also provide 3G mobile telephony services. These combine telecommunications and information technology and operate in the 2000 MHz frequency range. The mobile telephony services are based on the third generation UMTS (Universal Mobile Telecommunications System) telecommunications protocol. UMTS (Universal Mobile Telecommunications System).The structure and operation of the 3G networks is similar to that of the second-generation networks that have been operating in Greece since 1993.
A typical Base Station operates at a power capacity of around 60 Watts. Accordingly, the GSM is known as a cellular or a cellular system. The size of a cell is associated with the expected number of mobile telephone users in each region. Thus, in sparsely populated areas such as rural areas, the cells are larger in size with a diameter of up to 35 km. Conversely, in densely populated areas like cities, the cells are smaller with a diameter that can reach only 300 m.
When the number of mobile telephones that use a cell are greatly increased, the Base Station is then insufficient to serve all the users and we have phenomena of overloading. We then have the so-called subdivision of cells, i.e. they are divided into smaller cells and are generally covered by less powerful Base Stations. Consequently, the more Base Stations that are placed in a given area, the lower the operating power of each Station, and accordingly the transmission power of the mobile telephones that communicate with those stations closest to the user is smaller.
When the mobile telephone is far from the Base Station it does not have a good signal, it then transmits at its maximum power, which is 250 mW. But if there was a Base Station near the mobile telephone, the device would then operate at an average power of 62.5 mW, a value far below the maximum. Therefore, a dense network of mobile telephony stations ensures that the mobile telephones operate at minimal power and users receive less electromagnetic energy from their device.
It should therefore be strongly emphasized that the technical specifications and physical limitations of the GSM system worldwide, impose the installation of Base Stations within the urban structure, since this is where the majority of users are situated. Nowadays, there are no mobile telephony networks that operate or can operate and provide communication coverage when they are only installed outside inhabited areas.