In telecommunications, The The aim is 4G is the fourth technology to achieve generation of cell phone is currently “ultra mobile communications available in broadbandstandards. It is a successor some speed” – of the third generation countries to be (3G) standards, will soon but it is counted in become the standard for still being gigabytes cellular wireless. perfected. per second.
Will allow users to ITU designed 4G in download a full-length 2002 with the official feature film within five name “3G Long-Term minutes. Evolutions” or 3.9G. 4G is adoption of packet switching instead of circuit Will also be able toswitching in voice and video calls. stream high-definition With packet switching, resources are only used when there is television and radio toinformation to be sent across 4G hand-held devices. uses spiral multiplexing.
The first commercial deployment was by Telia Sonera and NetCom. Telia Sonera branded the network “4G”. The modem devices on offer weremanufactured by Samsung (dongle GT- B3710). The network infrastructure were created by Huawei (in Oslo) and Ericsson (in Stockholm).
Except for the Scandinavian countries, a fewcountries have started the 4G commercially.In the US, Sprint Nextel initiated the service last year. Countries expected to launch 4G by this year are Germany, Spain, China, Japan and England.
There are three primary technologies that support 4G – WiMax, LTE, and UMB. The main doubt is whether to implement WiMax or LTE. The advantages of LTE are:(i) Faster speed with 100 Mbps for download and 50 Mbps for upload. (ii) It makes CDMA and GSM database. (iii) It offers both FDD and TDD duplexing.
WiMax technology might not achievethe required rate in a high-density area.However, WiMax technology becomes useful when it is bundled with IPTV. The wireless bandwidth will be roughly 3Mbps/1.5Mbps; but this isnowhere near the +100Mbps/50Mbps that LTE promises.
Has already begun the process of introducing 4G India is among the latecomers in 3G. It is felt that by the time the implement 3G fully, 4G technologies such as LTE will be available commercially. It has taken three years for the government to decide on 3G-spectrum policy. 4G could face the same delay unless Indiawants to catch up with the rest of the world.
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