In fact, this incident, in a simple sentence, is the signal shielding out of the question. That signal shielding is how to operate? Take the cell phone as an example, the cell phone outside the terminal for communication, you need to use the signal tower to pass electromagnetic waves, and electromagnetic waves in the process of transmission, will remain at a certain frequency. And signal shielding is through the shield to interfere with the frequency of the cell phone, so that the frequency of the cell phone and the outside terminal deviation, and ultimately can not communicate. Therefore, to achieve efficient signal shielding, the signal frequency analysis of the phone is very critical.
Generally speaking, China Mobile's 4G is mainly in the two major frequency bands of 2320-2370 MHz and 2575-2635 MHz, while China Telecom is in the two major frequency bands of 1755-1785 MHz and 1850-1880 MHz, and China Unicom is in the frequency bands of 1955-1980 MHz and 2145-2170 MHz. that is to say, as long as the examination room That is to say, as long as the examination room shielding device, can realize the shielding of the above frequency band full coverage, can ensure the security of the college entrance examination room. But the problem is that the 4G shield meets the 5G technology!
Then, in the end, what is 5G technology. 5G, in fact, the full name is called the fifth generation of mobile communications technology, with high speed, low latency and large connection characteristics, the future is expected to realize the human-machine interconnection network infrastructure. Its peak rate can reach 10-20 Gbit/sec, which can meet the transmission of large data such as high-definition video and virtual reality. The delay can be as low as 1 millisecond, which can meet the automatic driving and remote medical care. At the same time, it has a wide spectrum, which can be more than three times that of LTE. It is also because of this feature that 5G has also been pushed to the forefront.
In China, China Mobile's 5G band is 2515~2615MHz, China Telecom's 5G band is 3400MHz-3500MHz, and China Unicom's is 3500MHz-3600MHz. in fact, Telecom's and Unicom's 5G bands are actually contiguous, with 200MHz of bandwidth between 3400MHz-3600MHz. Compared to the traditional 4G signal is much higher, and if the 4G shield is used at this time, there is a real possibility of leakage. Even Xiaomu can boldly predict that the candidate may have used a Unicom or Telecom phone.
Then, the question comes up again, since 4G and 5G are both shielded by interference with the cell phone band, why not produce a more powerful shield? It can cover all the frequency bands of 4G and 5G?
In fact, for the shield is a relatively small market, we think about it, in our lives, the opportunity to use the shield is not much. And by using to the scene is similar to the college entrance exams, exams, airports, trains, high-speed rail and other security check environment. The use of these environments, generally administrative behavior, resulting in the shielding market is actually a closed market, most manufacturers, it is difficult to keep up with the times to complete research and development and product upgrades. In the three major operations have taken the 5G frequency band, relative to the shield manufacturer may not have kept up.
For the moment, 5G technology has been developed for many years, the shield does not seem to smell the flavor of 5G, therefore. This time, I am more inclined to the shield did not update the 5G shielding function, rather than the poor quality of the shield. I don't know if you have noticed that no matter how we update our shield, we are being led by the nose by communication technology. The development of communication technology to 5G, our shield has to be updated to must have 5G signal shielding function. Then what about the future 6G, or even 7G, 8G? Always follow? There is no way to do it once and for all?
In fact, a long time ago, the communications industry has discussed the need for such equipment as cell phone shielding, if the country can control the radio spectrum, there are many programs that can be used to improve the reliability of the signal shielding. For example, we can shut down the base station during the college entrance exams, so that cell phones do not have a bridge for signal reception, blocking communication services. But the problem with this strategy, is that it will also be a short period of time, blocking the communication services of other people, to take into account the wide-ranging impact.
In fact, for this matter, 5G technology really can not take the blame for this, the new technology is to embrace, rather than choking on it. Moreover, there are many means by which the signal shielding of the college entrance examination room can be realized, giving the majority of candidates a fair competition environment. # high school exam questions leaked, 5G should not take the blame#