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4G is the fourth generation of wireless mobile telecommunications technology, succeeding 3G. A 4G system must provide ITU-defined capabilities in IMT Advanced. Potential and current applications include modified mobile web access, IP telephony, gaming services, high definition mobile TV, video conferencing and 4D television. The long-running launch standard (LTE) (a 4G candidate system) has been commercially deployed in Oslo, Norway and Stockholm, Sweden since 2009.
Wireless technology has transformed our lives in many ways. Until very recently, we needed a computer connected to a port, to get online. Even wired phones are becoming a thing of the past. Today, we use our mobile phones for banking, to check the availability of tickets in a movie theater, and many more. Wireless communication is the transfer of information over a distance without the use of improved electrical conductors or "cables." And, wireless networks refers to any type of network that does not involve cables. It also helps to save the cost of Network cables to provide mobility.
There are different types of wireless networks defined according to their size, range and speed of data transfer.
• Wireless PAN - Personal Area Network Wireless Personal Area Networks
• Wireless LAN - Local area network
• Wireless MAN - Metropolitan Networks
• Wireless WAN - wide area networks
• Mobile device networks
Mobile networks have evolved enormously over the last 3 decades. The cellular concept was introduced with 1G networks ('G' means generation). Today, 4G technology is gearing up to storm markets. Not only that, research on 5G technology has already begun