Abstract : 4G is the fourth generation standard of the mobile communication technology, and it is the successor of Tri-band 3G telecommunication networks. 4G is widely used in multimedia applications involving cloud computing, high definition mobile TV, video conferencing, IP telephony and all others which include the high quality streaming of a combination of data, audio, visual, text and other interactivity. The objective of this paper is to explore the evolution of 4G, its use and implementation in real time systems and to discuss its drawbacks. The term 4G however, is not restricted to cellular telephone systems. It also broadly includes several types of broadband wireless access communication systems. The first commercially automated cellular network (the 1G generation) was launched in Japan by NTT in 1979. In the 1990s, the 'second generation ' (2G) mobile phones came about, primarily using the GSM standard. Yet, this was nowhere near the expected standard and therefore the industry developed the 3G technology which made use of packet switching techniques for data transmission. As the use of 3G became more widespread and people began to utilize mobile phones in their daily lives, it became clear that demand for data services (such as access to the internet) with higher speed and Quality of Service was imminent. Consequently, the industry began looking to data-optimized 4th-generation technologies, with the promise of speed improvements up to 10-fold over existing 3G technologies. And thus came the two candidate systems: * The WiMax Standard * The LTE Standard WiMax , also known as 802.12m (standardized by IEEE) was developed in 2006 and four years later the Long Term Evolution standard (LTE) was introduced by 3GPP(3rd Generation Partnership Project) and was first launched by TeliaSonero. Evn though LTE does not meet the full technical requirements of 4G standard set by the ITU-R, it is still accepted as a 4G service.
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