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Difference Between 2G,3G,4G,5G Technologies:

          Second Generation (2G) technology was launched in the year 1991 in Finland. It is based on the technology known as global system for mobile communication or in short we can say GSM. This technology enabled various networks to provide services like text messages, picture messages and MMS. In this technology all text messages are digitally encrypted due to which only the intended receiver receives message. These digital signals consume less battery power, so it helps in saving the battery of mobiles.
        Speed :- 9.6/14.4 kbps.
        Technology:- TDMA(Time Division Multiple Access),                                           CDMA(Code Division Multiple Access).

        2G capabilities are achieved by allowing multiple users on a single channel via multiplexing .These are used on mobile phones for data along with voice communication.

       3G technology generally refers to the standard of accessibility and speed of mobile devices. It was first used in Japan in the year 2001. The standards of the technology were set by the International Telecommunication Union (ITU). This technology enables use of various services like GPS (Global Positioning System), mobile television and video conferencing. It not only enables them to be used worldwide, but also provides with better bandwidth and increased speed.
        3G is made possible by two complementary technologies: HSDPA and HSUPA (high speed download and upload packet access, respectively). These technologies enable mobile broadband users to access download speeds of up to 21Mbps and upload speeds of up to 1.76Mbps via a mobile dongle, USB modem or MiFi.
        Carriers that use orthogonal frequency-division multiplexing (OFDM) instead of time division multiple access (TDMA) or code division multiple access (CDMA) are increasingly marketing their services as being 4G, even when their data speeds are not as fast as the International Telecommunication Union (ITU) specifies. According to the ITU, a 4G network requires a mobile device to be able to exchange data at 100 Mbit/sec. A 3G network, on the other hand, can offer data speeds as slow as 3.84 Mbit/sec
        Although carriers still differ about whether to build 4G data networks using Long Term Evolution (LTE) or Worldwide Interoperability for Microwave Access WiMAX, all carriers seem to agree that OFDM is one of the chief indicators that a service can be legitimately marketed as being 4G. OFDM is a type of digital modulation in which a signal is split into several narrowband channels at different frequencies. This is more efficient than TDMA, which divides channels into time slots and has multiple users take turns transmitting bursts or CDMA, which  simultaneously transmits multiple signals on the same channel.

        5G is still not available but its gonna commence in 2018 ,efforts are being produced by Google ,Facebook ,Intel companies to improve 5G.
        It is provided through drones flying over the clouds so that it can be even reached even to people living in hilly areas ,forest areas b it seems there are some failures as these drones are failing in their test runs by Google.
      5G simply stands for fifth generation and refers to the next and newest mobile wireless standard based on the IEEE 802.11ac standard of broadband technology, although a formal standard for 5G is yet to be set.

According to the Next Generation Mobile Network's 5G white paper, 5G connections must be based on 'user experience, system performance, enhanced services, business models and management & operations'.
And according to the Groupe Speciale Mobile Association (GSMA) to qualify for a 5G a connection should meet most of these eight criteria:
One to 10Gbps connections to end points in the field and in One millisecond end-to-end round trip delay with  1000x bandwidth per unit area and about10 to 100x number of connected devices
with 99.999 percent availability and 100 percent coverage ,
90 percent reduction in network energy usage and
up to ten year battery life for low power, machine-type devices.

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