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Advanced International Mobile Telecommunications

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Advanced International Mobile Telecommunications
International Mobile Telecommunications-Advanced (IMT Advanced), better known as 4G, 4th Generation or Beyond 3G, is the next technological strategy in the field of wireless communications. A 4G system will upgrade existing communication networks and is expected to provide a comprehensive and secure IP based solution where facilities such as voice, data and streamed multimedia will be provided to users on an "Anytime, Anywhere" basis and at much higher data rates compared to previous generations

Objectives

4G is being developed to accommodate the QoS and rate requirements set by forthcoming applications like wireless broadband access, Multimedia Messaging Service (MMS), video chat, mobile TV, HDTV content, Digital Video Broadcasting (DVB), minimal services like voice and data, and other services that utilize bandwidth.

The 4G working group has defined the following as objectives of the 4G wireless communication standard:

* A spectrally efficient system (in bits/s/Hz and bits/s/Hz/site), * High network capacity: more simultaneous users per cell, * A nominal data rate of 100 Mbit/s while the client physically moves at high speeds relative to the station, and Gbit/s while client and station are in relatively fixed positions as defined by the ITU-R,[ * A data rate of at least 100 Mbit/s between any two points in the world, * Smooth handoff across heterogeneous networks, * Seamless connectivity and global roaming across multiple networks, * High quality of service for next generation multimedia support (real time audio, high speed data, HDTV video content, mobile TV, etc * Interoperability with existing wireless standards, and * An all IP, packet switched network.[

In summary, the 4G system should dynamically share and utilize network resources to meet the minimal requirements of all the 4G enabled users.

Approaches

As described in 4G consortia including WINNER, WINNER - Towards Ubiquitous Wireless

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