Where is 5g really powerful? What is the difference with 4G?

5G The first impression I gave you was that it was very fast , Second movie , This is also a point vigorously promoted by the media ,5G Is really faster than 4G Much faster. , however 5G Not only is the speed greatly improved , There are other more important advantages .

I don't know if you have this feeling ,4G The speed of is already very fast , We don't get stuck watching videos on our mobile phones , It is necessary to change 5G Do you ？5G Is it a pseudo requirement ？

To answer this question , Let's take a look first 4G The problems faced .

4G Limitations

I wonder if you have such experience , At a rally 、 The concert 、 Or a meeting with many people , Will suddenly find 4G The Internet is down , Although the network connection signal displayed on the mobile phone is still very strong , But the data can't be sent out at all , I can't receive them either . The reason is that the data flow exceeds 4G The bandwidth of the network , Once the traffic exceeds the bandwidth , Then the error rate of transmission is 100%, A byte of data can't be transmitted .

In theory ,4G Each square kilometer can only support 10 Ten thousand devices . If everything is interconnected （IoT） Universal development , So many devices are connected to the Internet at the same time ,4G It's hard to meet , So in order to adapt to the development of the times ,5G It is a necessary infrastructure for the next few years .

So why is it impossible to 4G On the basis of , By increasing the power and bandwidth of the base station, the two networks can be integrated ？

because 4G There are three unsolvable problems in the mobile communication standard ：

First , When there are too many Internet Devices , Its bandwidth is not enough , The ability to handle internet requests concurrently is also insufficient .

As more and more devices need to be connected to the Internet ,4G The bandwidth of has been too fast to meet the simultaneous Internet access of so many devices , Making 4G Standard time , In fact, I didn't plan to let so many devices access the Internet at the same time , therefore 4G The network can no longer meet the future development requirements of this era .

secondly , Today's IoT The way devices are connected to the Internet is actually very inconvenient .

Today we use IoT equipment , Or connect with you via Bluetooth and then surf the Internet , Or through the family Wi-Fi Connected to the Internet , Or insert a phone card into the device , In short, you can't directly connect to the Internet . Imagine our electric rice cooker in the next few years , The refrigerator , Washing machine , Curtains and lights can be connected directly through a built-in chip 5G The Internet , There is no need to operate through the mobile Internet , Will it be much more convenient ？

Last , If you simply add 4G Transmit power of the base station , That requires a dozen times more power , Will endanger people's health , and , If the frequency of radio waves keeps increasing , You blocked the signal with a piece of paper .

because 4G These serious problems , Is unable to adapt to the future IoT In the era of , So we need to redesign this to be called 5G New network standard , In addition to increasing the total bandwidth , The more important goal is to let a large number of devices access the Internet at the same time , therefore 5G Is and IoT Associated .

It has been said so many times IoT, that IoT What is it ？

IoT（Internet of things ） It's the Internet of things , namely “ The Internet of things ”, It's an extension of the Internet , A huge network is formed by combining all kinds of information sensing devices with the network , Realize at any time 、 Any place , people 、 machine 、 The interconnection of things .

5G The advantages of

5G The main advantage of the Internet is , Data transmission rate is much higher than the previous cellular network , Up to 10 Gbit/s, More than now 4G LTE Cellular networks are fast 100 times . Of course, this is only the theoretical speed limit , We usually use 5G I feel that I can't reach this speed , But the speed ratio 4G Ten times faster is certain .

After the network speed has been increased by an order of magnitude , The application space of imagination is very large , Virtual reality （ English ：virtual reality, abbreviation VR） And augmented reality （Augmented Reality, abbreviation AR） Will it be popularized ？ Will telemedicine be realized ？ Will it reshape the video game industry , In the future, we may not play games on the computer , It's like 《 No. 1 player 》 Just like entering a virtual world directly ？

5G Another advantage of the network is the low network latency （ Faster response time ）, Under the same conditions 5G The delay is lower than 2 millisecond , and 4G by 80 millisecond , That is to say, on average 5G Reaction rate ratio 4G Be quick 40 times .

5G One of the application scenarios with low network latency , It is the fast machine to machine interaction in the Internet of things . for example , Computers in vehicles on the road can be accessed through 5G Communicate with each other continuously , It can also communicate with the road continuously , To achieve automatic driving , Let the former impossibility become possible .

Actually calculate ,120 The car brakes at km / h ,4G The network probably has 80ms Delay of , That is to say 3 More than meters of braking distance , and 5G Can shorten the distance to 10cm, therefore 5G For autopilot cars , Can be realized in 4G What the times can't do .

5G Deficiency

Said so much 5G Where the bulls are , that 5G Is there no defect ？

Of course. , Here are two points ：

1. The upper limit of network speed has been set

There are two main ways of communication , Wireless communication and wired communication .

The path of wireless communication ： mobile phone /Pad– The base station – Core network – Internet

The path of wired communication ： The computer / Other network devices – Internet

That is to say, no matter the wireless communication of mobile phones , Or the computer's wired communication , Finally, they all have to go through the Internet ,5G But the connection between the mobile phone and the base station has become faster , The final network speed depends on the Internet , That is, the bandwidth and response speed of each data center and optical fiber determine 5G The upper limit of network speed .

2. It costs a lot of money

5G The frequency of electromagnetic wave used is relatively high , As soon as the frequency is high, the penetrability becomes poor , You need more base stations to cover the blind area ,5G The estimated number of base stations is 4G Of 5 About times , This requires very high capital requirements .

Last

5G It was born for the interconnection of all things , Everybody knows 5G Very important , But now no one knows 5G Where will the biggest applications be , Maybe it is a place where everyone will be surprised .

Just like now 4G, When I first came out , Everyone feels 4G The biggest use is to watch movies on your mobile phone , Actually 4G The biggest change in our lives is the realization of mobile payment , Make mobile phones more important than wallets , Changed everyone's way of life , From an unexpected angle, a brilliant flower came out .

as for 5G Prospects , Let's wait and see ！