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mr.fergy 5.02.09 - 02:44am
Table of Contents
Frequently Asked Questions on 4G
By Zahid Ghadialy
Last Updated: 14/05/2006
What is 4G Wireless Technology?
At present 2G Technology (GSM) is widely used worldwide. The problem with 2G technology is that the data rates are limited. This makes it ineffecient for Data Transfer applications like video conferencing, music or video downloads, etc. To increase the speed various new technologies have come into picture. The first is 2.5G (GPRS) technology that allows data transfer at a better rate than GSM and recently 3G (WCDMA/UMTS) technology has come into picture. The maximum theoretical data transfer with this 3G technology is 2Mbps (practically it could be a max of 384Kbps or even less). The 4G technology which is at its infancy is suppose to allow data transfer upto 100Mbps outdoor and 1Gbps indoor.
When is the 4G Technology going to be launched?
NTT Docomo is planning to launch 4G sevices in Japan around 2010-2015. Earlier it announced that it would be launching the service in 2006-2008. But at the same time it has said that the data transfer would be maximum of 20Mbps. Recently they have started calling this intermediate launch as 'Super-3G'.
So is it only the Japanese Companies that are working toward 4G?
Not really. NTT-DoCoMo is jointly developing 4G with HP. A the same time Korean companies like Samsung and LG are also looking into 4G. In Europe companies like Siemens are also working on this. Recently Japan, China and South Korea has started working together on the technology and they plan to standardise it together. See News section for more detail.
What would be the main features of 4G Technology?
The 4G technology will be able to support Interactive services like Video Conferencing (with more than 2 sites simultaneously), Wireless Internet,etc. The bandwidth would be much wider (100 MHz) and data would be transferred at much higher rates. The cost of the data transfer would be comparatively very less and global mobility would be possible. The networks will be all IP networks based on IPv6. The antennas will be much smarter and improved access technologies like OFDM and MC-CDMA (Multi Carrier CDMA) will be used. Also the security features will be much better.
What are the likely new features?
The entire network would be packet switched (IP based). All switches would be digital. Higher bandwidths would be available which would make cheap data transfer possible. The network security would be much tighter. Also QoS will imrpove. More effecient algorithms at the Physical layer will reduce the Inter-channel Interference and Co-channel Interference.
Is HSDPA part of 4G Wireless technology?
No. HSDPA is part of 3G technology. See HSDPA Tutorial for more details.
Is 'Super-3G' same as 4G Wireless technology?
No. As mentioned earlier, 'Super-3G' is an intermediate stage between 3G and 4G. In this stage the operators are planning to achieve data rates upto 100Mbps when travelling at speeds upto 100Kmph. Complete information is not yet available on this topic.
Why go for 'Super-3G' technology? Why not directly jump to 4G?
The main reason is that the mobile operators are scared of WiMax since they have invested massive amounts in 3G licenses and infrastructure. They want to have a network better than WiMax so they need this 'Super-3G'. Also the operators want to compete with each other so if they see one operator going for 'Super-3G', all of them want to jump in the bandwagon.
Is LTE a 4G technology?
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