Cellular phone simply is born and develops the need for human contact. In the background, it comes from the same unstoppable momentum that generated other wireless systems of communication as of Chappe telegraphs Morse, or closer to our time in distant times the own fixed telephony, broadcasting, television, and satellite transmissions.
Nobody, absolutely nobody, illuminated awoke one day and said “I will invent a mobile phone”.
As all the inventions of mankind, cell phones started from scratch. Obviously, there was a concern, a necessity, as we qualify it previously, communicate, but this time at greater distance and from different environments.
The need became vital during World War II, Allied soldiers and their opponents who were on the battlefield.
Save lives or communicate a military strategy at some point, were two of several determining factors which led to the creation of a handheld transceiver called handie talkie, in the forties of the last century.
The handie talkie and its similar walkie-talkie, whose size was larger in comparison with the second, can be considered the first ancestors of cell phones, although there is a big difference between them, because the first use a single channel to the transmit-receive voice limited about 3 kilometers (1.86 miles) away from one device to another While mobile phones of today function thanks to networks and stations with huge geographical space for communication.
The “G” spot: 1 to 4
This system of mobile telephony has expanded and developed, in parallel with the technological evolution of own cellphones, whose process is identified by generations according to the advances that are introduced. Until now are four:
1G – similar networks: the first generation emerged in the late seventies and early eighties of the last century. This technology, characterized by being analogue and only for voice, introduced the use of multiple cells and the ability to transfer calls from one place to another while the user travelled during the conversation, for which the Tower of coverage linking with nearby cell sites to maintain communication.
However, the transmission of these cells was inaccurate and not had good sound quality. The predominant technology of this generation was the advanced system of mobile telephony, Advanced Mobile Phone System (AMPS for its acronym in English), which was used with greater force in United States.
2G – digital globalization: Unlike the previous, second generation throughout the process is digital. We must remember that both the 1 G and 2 G used digital systems for the connection of the radio bases with the telephone network, but in the first transmission took place exclusively analogue.
In the second generation, advanced cell phones, with smaller dimensions, connecting quickly to signal nets are presented. In this period, undoubtedly, mobile had a great growth and popularity, among other things by the emergence of prepaid phones. Similarly, users set out for the first time in a very effective tool for communication: SMS (Short Message Service) text messages.
Initially, these SMS were made possible through the Global System for mobile communications, Global System for Mobile Communications (GMS), today the most popular standard for cellular telephony in the world, with over 3 billion users in 212 countries. Then, the text messaging service was available on all digital networks. During this 2G subscribers could also enjoy ringtones payments.
3G – high transmission: before reaching the third generation, wireless incorporated technological improvements to the 2 G, whose advances were changing their concept. Then he spoke of 2.5 g and 2.75 G, generations who actually paid the way for this 3 G, which as a basic difference over the previous is the switching of packages for data transmission. With this innovation, what benefits does the user?
Simple. With the capacity of transmission of voice and data through mobile phones, the third generation services allow to the Subscriber the possibility of transferring both voice and data in a simple telephone communication or a videoconference, as well as transmit only data – without voice – like downloads of programs, exchange of emails, instant messaging, etc., and all with a speed of 384 kbps, which enables you to watch videos. >> for details.
This data transmission is provided from the moment in which the 3G cell phones had access to Internet connections. Also reached technological development allows global compatibility and coexistence with mobile services with second-generation networks. In case outside little, 3G increased the level of security to authenticate the network to which you are connecting.
4G – speed futuristic in 4th Generation: the technological breakthrough that will distinguish the fourth generation of the 3G has that view with the Elimination of the Exchange circuits, to only use IP (Internet Protocol) networks, i.e. those that occur with the convergence between networks of cable and wireless, suitable for smart phones or smartphones and wireless modems, among others.
All data, including voice calls, will be transmitted via packet switched with a speed that will be above 1 GBps, in addition to having more bandwidth. With these values, through a mobile or cell phone can be a perfect welcome to high definition television or high resolution.
As you can see, from generation to generation, cell phones make your call to the future… and we respond to it.
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