4G An Overview

4G An OverviewBehold, 4G is coming soon. As 3G services are on the verge of start, operators are already chalking out plans for deploying 4G here in India.

As you might know Verizon in USA and Vodafone D2 in Germany have successfully launched 4G services, many operators around the world are ready to follow soon. The following post briefs about Long Term Evolution (LTE) – System Architecture Evolution (SAE), a 4G technology.

While 3G was revolution, 4G is evolution. The main aim of 4G technology was to enable users with high speed mobile internet access, thus enabling several other features. Also other aim was to converge all the existing networks into one network.

It’s truly a technological evolution. While 3G was more of an extension to 2G, 4G is entirely new. The entire mobile network architecture was redesigned so as to achieve always on high speed connectivity and also enable operators with various mobile networks to converge into one network.

There are two parts to this evolution. LTE – This is mainly an air interface evolution. Technologies like OFDMA, 64 QAM and MIMO were used for LTE over air interface making it possible to squeeze a lot of data in limited frequency. All technological evolutions of LTE are being tracked by 3GPP as part of Release 8.

Other part of the network is the core network which is referred to as SAE. The core network also has been modified from a 3G network, so as to cope with fast air interface. Major change in core network is the flat all IP network. Also SAE is designed in such a way to accommodate other networks like CDMA, WiFI and Wimax. This means a mobile from CDMA, wifi or wimax network can smoothly roam into a SAE network. This was a huge advantage of LTE SAE over other 4G technologies. The flat IP architecture has reduced the number of nodes in the network making it easy for the maintenance.

LTE-SAE is truly a remarkable achievement, but it has its own caveats. The biggest problem with LTE is that there is no traditional voice call support. This means you simply cannot dial a number. All the calls are supposed to be VOIP calls. Several solutions like, CS Fallback, VOLGA, IMS, are proposed to support voice over LTE but operators are still not convinced with any of the solutions. For now the LTE deployments are mainly aimed at providing high speed internet access.

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  • Anirban Mukherjee January 25, 2011 2:22 am, 2:22 AM

    @Anirban Mukherjee

    any reference???? As per I know they termed LTE-advanced as 3.9G.

  • Aamit January 24, 2011 3:01 pm, 3:01 PM

    Pehle 2G to thik se chalao. Till now in many places of India 2G network is not available or not up to the mark of many Operators. Instead of thinking about 3G, 4G with high tariff Operators should think and act properly to improve the 2G and benifit the average-class customers because they will be earn more by giving superior quality of network availability and increasing the number of customers. In a country like India business should be done by aiming common,average class people.
    Like take Reliance as example. When they entered into Telecom business they aimed common, average people and the had a huge growth in their industry. But now they aim for high class people. They sold Flag telecom to get the money to invest in 3G which is for high class people. Instead of doing that they could have invested that money to improve their network and lowering the tariff. And now the result shows that most of the people are leaving Reliance.

  • Kishor January 24, 2011 2:11 pm, 2:11 PM

    Since the operators are already invested a huge sum of money in 3G spectrum, I don’t think they will immediately switch to 4G which require another network upgradation.

    @Santosh Dornal
    Anyway nice info.

  • Keshav Jha January 24, 2011 10:35 am, 10:35 AM

    India is always lacking in terms of new technologies. Our govt. does not support fast deployment.

  • Sam January 24, 2011 9:43 am, 9:43 AM

    Hari :3g jis tarah launch hue hai. Us hisab se lagta hai ki 4g 2025 tak launch ho jaygi

    LMAO ROTFL so true……

  • Avinash M January 24, 2011 12:14 am, 12:14 AM

    hspa+ or 3.9G is a pre 4G technology offered by our private operators in india.

  • Avinash M January 24, 2011 12:11 am, 12:11 AM

    hspa+ is a pre 4G technology offered by our private operators in india.

  • Rudradeep Biswas January 23, 2011 10:29 pm, 10:29 PM

    @Anirban Mukherjee
    true buddy! LTE/WiMaX are pre-4G, or 3.9G! But on general use its considered as 4G! LTE advanced is true 4G!

  • TREMERIN DSOUZA January 23, 2011 10:23 pm, 10:23 PM

    @Anirban Mukherjee

  • Anirban Mukherjee January 23, 2011 9:59 pm, 9:59 PM


    Pre-4G technologies such as mobile WiMAX and first-release 3G Long term evolution (LTE) have been on the market since 2006 and 2009 respectively, and are often branded as 4G. The current versions of these technologies did not fulfill the original ITU-R requirements of data rates approximately up to 1 Gbit/s for 4G systems.

    how can we define this as 4G????

  • SHARMA January 23, 2011 8:52 pm, 8:52 PM

    please inform about launch of reliance infotel @JDJAIN

  • Hari January 23, 2011 5:46 pm, 5:46 PM

    3g jis tarah launch hue hai. Us hisab se lagta hai ki 4g 2025 tak launch ho jaygi

  • JDJAIN January 23, 2011 4:26 pm, 4:26 PM

    after 5 year of sleep , mukseh je wake up with bang, get pure ghee, insted of 3G spectrum , he chhose 2.3Ghz LTE band, and sooner local voip calling is possible, so voice calling may be free with in next 3 years

  • JDJAIN January 23, 2011 4:25 pm, 4:25 PM

    Dude , Mukesh je coming with LTE-TDD duplex, it is well short of 4G , maximum speed is 80mbps

    Uploading speed is also 40 to 50mbps, And mukesh je bought spectrum at dirt cheap price , and LTE-TDD is very very efficent tech , so data charge must must be very lower that present adsl or 3G traffic, i can say , Tiger is ready to show Forest , who is king

  • PD January 23, 2011 2:24 pm, 2:24 PM

    At present 2G is lame and 3G is at horizon! So where is 4G now ? The technological advancement needs an urgent re-look ! Heard about “Penny wise and Pound ………….?

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