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This article mainly explains "what is the difference between 5G and 4G". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought. Let's study and learn "what are the differences between 5G and 4G"?

The first impression of 5G must be that it is very fast, and the movie in seconds is also a point vigorously promoted by the media. 5G is indeed much faster than 4G, but 5G is not only much faster, but also has other more important advantages.

I don't know if you have this feeling, the speed of 4G is already very fast, our mobile phone watching video is not stuck at all, is it necessary to change 5G?

Is 5G a pseudo demand?

To answer this question, let's first look at the problems faced by 4G.

Limitations of 4G

I don't know if you have this kind of experience. In a rally, a concert, or a venue with a lot of people, you will suddenly find that the 4G network is down. Although the connection signal of the network shown on the mobile phone is still very strong, the data can not be sent or received at all.

The reason is that the data traffic exceeds the bandwidth of the 4G network. Once the traffic exceeds the bandwidth, the transmission error rate is 100%, and a byte of data cannot be transmitted.

In theory, 4G can only support 100000 devices per square kilometer. If the Internet of everything (IoT) is widely developed, 4G is difficult to meet when so many devices surf the Internet at the same time, so in order to adapt to the development of the times, 5G is a necessary infrastructure in the next few years.

So why is it impossible to achieve the convergence of the two networks by increasing the power and bandwidth of the base station on the basis of 4G?

Because the 4G mobile communication standard has three problems that cannot be solved:

First of all, when there are too many Internet devices, its bandwidth is not enough, and its ability to process Internet requests concurrently is also insufficient.

With more and more devices that need to be connected to the Internet, the bandwidth of 4G is fast enough for so many devices to surf the Internet at the same time.

Therefore, 4G network can no longer meet the requirements of the future development of this era.

Second, today's IoT devices are actually very inconvenient to connect to the Internet.

Today, people use IoT devices, either connect to you through Bluetooth and then surf the Internet, or connect to the Internet through the Wi-Fi at home, or plug in a phone card in the device, which is not directly connected to the Internet.

Imagine that in the next few years, our rice cookers, refrigerators, washing machines, curtains and lights can be directly connected to the 5G network through built-in chips.

Finally, if you simply increase the transmission power of 4G base stations, you need to increase the power more than ten times, which will endanger people's health, and if the frequency of radio waves continues to increase, you will block the signal with a piece of paper.

Because these serious problems of 4G can not adapt to the future IoT era, so to redesign this new network standard called 5G, in addition to increasing the total bandwidth, the more important purpose is to allow a large number of devices to surf the Internet at the same time, so 5G is associated with IoT.

IoT has been mentioned so many times, so what on earth is IoT?

IoT (Internet of things) is the Internet of things, that is, the Internet of everything, which is an extension and expansion of the Internet. It combines a variety of information sensing devices with the network to form a huge network to achieve the interconnection of people, machines and things at any time and any place.

Advantages of 5G

The main advantage of the 5G network is that the data transmission rate is much higher than that of the previous cellular network, up to 10 Gbit/s, 100 times faster than the current 4G LTE cellular network.

Of course, this is only the theoretical speed limit, we usually use 5G feel is far from this speed, but the speed is more than ten times faster than 4G is certain.

After the Internet speed has been increased by an order of magnitude, there will be a lot of room for imagined applications. Will virtual reality (virtual reality, referred to as VR) and Augmented Reality (referred to as AR) become popular? Will telemedicine be realized? Will it reshape the video game industry so that we may not play games to the computer in the future, but directly enter a virtual world like the "number one player"?

Another advantage of 5G network is lower network latency (faster response time). Under the same conditions, the delay of 5G is less than 2 milliseconds, while that of 4G is 80 milliseconds, which means that 5G is 40 times faster than 4G on average.

One of the application scenarios of 5G with low network latency is the fast machine-to-machine interaction in the Internet of things. For example, computers in vehicles on the road can communicate with each other continuously through 5G, or continuously communicate with the road to achieve autopilot, making the previous impossibility possible.

According to the actual calculation, when braking at 120km / h, the 4G network probably has the delay of 80ms, that is, more than 3 meters of braking distance, while 5G can shorten this distance to 10cm, so 5G can achieve things that cannot be done in the 4G era for self-driving cars.

Deficiency of 5G

After talking so much about the advantages of 5G, does 5G have no shortcomings?

Of course, here are two points:

The upper limit of Internet speed has been determined.

At present, there are mainly two ways of communication, wireless communication and wired communication.

The path of wireless communication: mobile phone / Pad-- base station-core network-Internet

The path of wired communication: computer / other network equipment-Internet

In other words, whether it is the wireless communication of the mobile phone or the wired communication of the computer, it will eventually go through the Internet. 5G is just that the connection between the mobile phone and the base station becomes faster, and the final network speed depends on the Internet. that is, the bandwidth and response speed of each data center and optical fiber determine the upper limit of 5G network speed.

Cost a lot of money

The electromagnetic wave frequency of 5G is relatively high, and the penetration ability becomes worse when the frequency is high, so more base stations are needed to cover the blind area. the number of base stations of 5G is estimated to be about 5 times that of 4G, which requires high funding requirements.

Thank you for your reading. The above is the content of "what's the difference between 5G and 4G". After the study of this article, I believe you have a deeper understanding of the difference between 5G and 4G. The specific use of the situation also needs to be verified by practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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