5G is the fifth generation of cellular mobile communications .Demand for mobile data increasing exponentially across the world. Voice on mobile phone is no more a criteria for selection of any network. The whole telecom market is playing on data only. Consumption of data is increasing drastically in a very short span of time.
As data feasting increasing tremendously so up gradation of technology become necessity with the ecosystem. Data was started with 2G, 3G then 4G and finally with 5G. Technology is upgraded to next generation with an expected high data rate capacity.
Speed-
Technology wise expected speed of data in optimum conditions is as below.
2G download data speed – 100Kbps.
3G download data speed – 21.6Mbps.
4G peak download capacity – 1Gbbps (Stationary); 100Mbps (Mobile).
5G peak download capacity – 20Gbps (Stationary); 1Gbps (Mobile).
Along with speed, latency is also one criteria expected from upgraded technology.
4G and 5G are totally based of packet switch network (PS) only. 2G is inherently circuit switch (CS) network. 3G is hybrid of circuit switch (CS) and packet switch (PS) network.
Main objective of 5G performance are high data rate and low latency.
Building blocks of 5G-
We can say 5 Building blocks of 5G are (but not limited to…)-
Frequency Spectrum-
Frequency band for 5G is in millimetre waves with frequency band 26GHz, 28GHz, 38GHz and 60 GHz.
Allocated lower frequency band from 600 MHz to 6 GHz.
Specially it usage the frequency band 3.5 GHz to 4.2 GHz in this lower frequency band.
3.5GHz frequency is very important as it is likely to be globally harmonized.
However the speeds in lower band is only moderately high from 4G speed.
Antenna System-
In 5G antenna system is Massive MIMO (Multiple Input Multiple Output) technology where it comprises 64-256 antennas.
If we consider 1 physical antenna contains 8 dual polarized antenna elements and 1 sector usage 8 physical antennas then total antenna per sector would be (8*8=64). So 192 antenna elements per site.
Cell Site-
As 5G frequency range is in millimetre waves the absorption of signal is very high by buildings, trees, water and other particles in air.
Penetration of signal would be very low. Coverage distance of a cell site would be very less.
To cover a particular location requirement of no of cell sites will increase. In urban area 1 cell site would cover approximately 200m distance.
So regular macro cell sites (coverage range is approximately 500m to 2 Km for 4G) would be replaced by lot of small cell sites.
Beamforming-
In massive MIMO (multiple input multiple output) technique we use large no of antennas. The beamforming of these antennas are very much directive. So it is almost like serving individual user.
It has a very narrow main lobe, like laser-beam. Side lobes are very tiny. Less leakage in undesired directions.
Array gain of antenna is: 10 log10 (MA), where MA= no of antennas.
Transmission Backhaul-
3G, 4G or 5G, any technology can’t provide expected data speed until and unless we have a strong backhaul connectivity. Connectivity from Core (Switch) to BSC/RNS and finally to the base station (nodeB/enodeB) is the backhaul connectivity.
If we have high capacity backhaul till the BTS end then only we can get a high data speed on air interface between base station and our mobile station.
For 4G and 5G, Fibre backhaul connectivity is a major requirement. Without Fibre connectivity expecting a speed of 1Gbps or 20Gbps is beyond expectation.
Challenges-
Some major technical challenges of implementation of 5G are-
- Large space requirement for installation of Massive MIMO antennas.
- Roll out of huge no of small cells.
- Readiness of strong backhaul connectivity.
There are many other challenges like acquisition of new locations for small cells, etc.
There are many issues in hand but they all are solvable.
1st 5G deployment country-
The 1st country to launch 5G network is Qatar. Ooredoo a large mobile operator commercially launched 5G network in May 20018 in 3.5Ghz band.
Vodafone Qatar has also launched 5G in August 2018 in 3.5 GHz band.
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