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Why LTE require in telecom?

+2 votes

We been discussing with my friends that it's around 2 years when Airtel launched the first LTE network in Kolkata. and still none of the Operator has taken up the whole market ? yesterday's Idea CEO statement that it will take 2 years for them to deploy it in market.

My query is why do we require this in telecom ? How it is better which can force the operator's deployment compulsory ?

posted May 22, 2014 by Pankaj Deshmukh

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When describing smartphone data networks, you commonly hear the terms 3G, 4G, and LTE. This refers to the generation of network technology.  The third generation network, known as 3G, is the oldest technology of the group. 4G is the fourth generation data network and LTE stands for Long Term Evolution. The basic difference between them is the speed of the network. When selecting a smartphone, the older models may not support the newer data network technology. It is important to select a model that supports a data speed appropriate for your needs.

3G Network

The 3G network was the first technology with sufficient speed to provide a decent user experience on a smartphone.  There were some smartphones that used the older 2G EDGE technology, but the data speeds were slow and the user spent a lot of time waiting for data to load.
Each of the major cellular providers have 3G networks that provide coverage across most of the country. There are two competing 3G technologies currently being used: Global System for Mobiles (GSM) and Code Division Multiple Access (CDMA). AT&T and T-Mobile use the GSM technology while Verizon and Sprint use the CDMA technology. Since the technologies are not compatible with each other, this is the reason you can’t use a Verizon phone on an AT&T network (or vice versa).

4G and LTE

The 4G technology is the successor to the 3G technology. Cellular providers are still building out their 4G networks. Theoretically, 4G is much faster than 3G. But before we start comparing 4G speed to 3G speed, it is important to understand there are different versions of 4G.
When talking about 4G, things can get a little confusing. Basically, there is 4G and 4G LTE.  Many people consider LTE to be true 4G technology. Generally, if a cellular provider describes a 4G network without mentioning LTE, they are probably talking about a High Speed Packet Access (HSPA) network. The HSPA network is a faster version of the 3G GSM network. While not as fast as an LTE network, it is still faster than a 3G network. Since LTE is still relatively new, the cellular providers haven’t fully built out their LTE networks yet. Be careful when looking at the network coverage maps on the providers’ websites. Some companies claim to have broad nationwide 4G coverage.  They may really be taking about HSPA coverage and not LTE coverage.
In theory, LTE can be up to ten times faster than 3G. In practice, the actual network speed will vary based on network load and signal strength. Even if LTE does not meet its theoretical speed, it is still much faster than 3G. Activities that require large amounts of data, such as streaming movies, work very well on an LTE network. If you plan to perform a lot of data-hungry activities or simply want the best performance when surfing the Internet, you should really plan on buying a smartphone that supports LTE.
If you are considering buying an iPhone, you will find three models available: iPhone 5, iPhone 4S, and the iPhone 4. The iPhone 4S and the iPhone 4 are sold at reduced prices because they are older models. The iPhone 5 is the newest model and supports LTE. The iPhone 4S supports HSPA, which some cellular carriers call 4G. The iPhone 4 will only support 3G networks.

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1 Answer

+2 votes

Higher data rates: Obviously this is a general requirement requested from any new system.

Quality of service, Lower delay: To enable true convergence between real-time and non-real-time services quality of service awareness is of absolute importance. This must already be paid attention to during the design of the physical layer. So LTE/EPC will be QoS aware from the very beginning on and not have QoS as an add-on, which is usually not very efficient.

Expected New Spectrum allocation: It is expected to get some new frequency bands assigned to 3G. LTE should be ready to use these bands.

Flexible Bandwidth usage: LTE should be able to deal with frequency bands of different size. So a fixed bandwidth ultra-wideband system is not of big use. Rather LTE should be able to scale the frequency requirements dependent on the operator’s choice.

Reduced Terminal Complexity: 3G terminals are very complex and thus suffer often from poor performance due to hardware limitations and very often also software limitations (or bugs). LTE terminals should have essentially lower
complexity. This would also offer the possibility to implement other performance enhancement techniques later on.
These points result in a long list of requirements for LTE/EPC. So 3GPP/ETSI demand to have downlink bit rates of greater than 100 Mbps and uplink bit rates of 50 Mbps. Of high importance is also to increase the cell edge bit rates compared to HSPA.

answer May 23, 2014 by Pardeep Kohli
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