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Has it ever struck your curious mind how 4G evolved from simple Push to talk system ? Is there any governing body which regulates the spectrum ? What kind of services we will have in next generation of communication? So friends, Lets start the journey of wireless communication. Mobile radio-telephones were introduced for military communications in the early 20th century. Car-based telephones was first tested in Saint Louis in 1946. This system used a single large transmitter on top of a high rise building. A single channel was used for sending and receiving similar to a half duplex system. To talk, the user pushed a button that enabled transmission and disabled reception. Due to this, these became known as “push-to-talk” systems in the 1950s. To allow users to talk and listen at the same time, ITS (Improved Mobile Telephone System) was introduced in the 1960s. It used two channels one for sending and one for receiving bringing telecommunication to full duplex mode. In the 1970s Private companies have started developing their own systems to evolve the existing further. Those private systems are Analogue Mobile Phone System, used in America, Total Access Communication System and Nordic Mobile Telephone, used in parts of Europe and Japanese Total Access Communication System, used in Japan and Hong Kong. Independently developed systems are called as 1st Generation communication. It was introduced in 1982 by Bell Labs and popularly known as Advanced Mobile Phone System (AMPS). The key idea here was to divide geographical areas into cells. And each cell was served by a base station, so that frequency reuse can be implemented. As a result AMPS could support 5 to 10 times more users than ITS. Major concern for the 1st generation was weak Security on air interface, full analog mode of communication. And No roaming. Now, To implement roaming. Individual organizations started working under one umbrella, European Telecommunications Standards Institute (E T S I) and developed 2nd Generation system. Second generation cellular telecom networks were commercially launched in 1991 in Finland based on GSM standards. It could deliver data at the rate of up to 9.6 KBS. Three primary benefits of 2G networks over their predecessors were. Phone conversations were now digitally encrypted. It was significantly more efficient on the spectrum and allowed far greater mobile phone penetration level. 2G introduced data services for mobile, starting with SMS text message. Further To achieve higher data rates GSM carriers started developing a service called General Packet Radio Service (GPRS). This system overlaid a packet switching network on the existing circuit switched GSM network. GPRS could transmit data at up to 160 KBS The phase after GPRS is called Enhanced Data Rates for GSM Evolution (EDGE). It introduced 8 PSK modulation and could deliver data at up to 500 KBS using the same GPRS infrastructure. During this time the internet was becoming popular and data services...
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