4G (also known as Beyond 3G), an abbreviation for Fourth-Generation, is a term used to describe the next complete evolution in wireless communications.
It is a successor to 3G and 2G families of standards. Speed requirements for 4G service set the peak download speed at 100 Mega bit/s for high mobility communication (such as from trains and cars) and 1 Giga bit/s for low mobility communication (such as pedestrians and stationary users).
A 4G system is expected to provide a comprehensive and secure all-IP based mobile broadband solution to Smartphone, laptop computer wireless modems and other mobile devices. Facilities such as ultra-broadband Internet access, IP telephony, gaming services, and streamed multimedia may be provided to users.
4G is a combination of Mobile multimedia, anytime anywhere, Global mobility support, integrated wireless solution, and customized personal service. A 4G system will be able to provide a comprehensive IP solution where voice, data and streamed multimedia can be given to users and that too, at higher data rates than previous generations.
4G will generate new trends for the market and prospects for established as well as for new telecommunication businesses. The 4G data rates will vary depending on the number of channels that are available, and can be used. The channels that can be used will be cleaner thanks to technologies like adaptive processing, which detects interference on a channel and improves reception by actively switching channels to avoid interference.
4G networks will also use smart antenna technology, which is used to aim the radio signal in the direction of the receiver in the terminal from the base station. 4G technology is based upon OFDM (Orthogonal Frequency Division Multiplexing). OFDM is designed to send data over hundreds of parallel streams, thus reducing the complexity and increasing the amount of information that can be sent at a time over traditional CDMA networks.
4G technology possesses a number of features which are as follows:
Ø Based on an all IP packet-switched network.
Ø Dynamically share and utilize the network resources to support more simultaneous users.
Ø Smooth handovers across heterogeneous networks.
Ø Scalable channel bandwidth, between 5 and 20 MHz
Ø Peak data rates of up to approximately 100 Mbit/s for high mobility such as mobile access and up to approximately 1 Gbit/s for low mobility such as local wireless access.
Ø Ability to offer high quality of service for next generation multimedia support at low transmission cost.
Thus, 4G technology can greatly anticipate in evolving and advancing the pervasive computing, whose main aim is to attach itself to every living space possible, so that human beings remain intact with the wireless technology. Therefore 4G is able to connect various high speed networks together, which would enable us to carry digital devices even in dispersed locations. The network operators worldwide would be able to deploy wireless mesh networks and make use of cognitive radio technology for widespread coverage and access.
Written by Shishir Yadav