21-05-2012, 02:11 PM
4G-Technology
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4G refers to the fourth generation of cellular wireless and is a successor to 3G and 2G standards. The rest of this article associates 4G with International Mobile Telecommunications-Advanced (IMT Advanced), though 4G is a broader term and could include standards outside IMT Advanced. A 4G system may 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),[1]
High network capacity: more simultaneous users per cell,[2]
A nominal data rate of 100 Mbit/s while the client physically moves at high speeds relative to the station, and 1 Gbit/s while client and station are in relatively fixed positions as defined by the ITU-R,[3]
A data rate of at least 100 Mbit/s between any two points in the world [3]
Smooth handoff across heterogeneous networks,[4]
Seamless connectivity and global roaming across multiple networks,[5]
High quality of service for next generation multimedia support (real time audio, high speed data,
HDTV video content, mobile TV, etc)[5]
Interoperability with existing wireless standards,[6] and
An all IP, packet switched network.[5]
Approaches
As described in 4G consortia including WINNER (http://www.ist winner) , WINNER - Towards Ubiquitous Wireless Access, and WWRF (http://www.wireless-world-research) , a key technology based approach is summarized as follows, where Wireless-World Initiative-New-Radio (WINNER) is a consortium to enhance mobile communication systems.[7][8]
[attachment=22578]
4G refers to the fourth generation of cellular wireless and is a successor to 3G and 2G standards. The rest of this article associates 4G with International Mobile Telecommunications-Advanced (IMT Advanced), though 4G is a broader term and could include standards outside IMT Advanced. A 4G system may 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),[1]
High network capacity: more simultaneous users per cell,[2]
A nominal data rate of 100 Mbit/s while the client physically moves at high speeds relative to the station, and 1 Gbit/s while client and station are in relatively fixed positions as defined by the ITU-R,[3]
A data rate of at least 100 Mbit/s between any two points in the world [3]
Smooth handoff across heterogeneous networks,[4]
Seamless connectivity and global roaming across multiple networks,[5]
High quality of service for next generation multimedia support (real time audio, high speed data,
HDTV video content, mobile TV, etc)[5]
Interoperability with existing wireless standards,[6] and
An all IP, packet switched network.[5]
Approaches
As described in 4G consortia including WINNER (http://www.ist winner) , WINNER - Towards Ubiquitous Wireless Access, and WWRF (http://www.wireless-world-research) , a key technology based approach is summarized as follows, where Wireless-World Initiative-New-Radio (WINNER) is a consortium to enhance mobile communication systems.[7][8]