On February 28, China Unicom and China Telecom formally obtained the FDD 4G license yesterday. In 2014, 4G was officially commercialized in China, and many people also used 4G mobile phones. But do you really understand about 4G? Here are 6 "secrets" you should know about 4G.
The theoretical 4G rate is different from the actual use
Previous media reports have reported that 4G networks are fast, and they often give an example. Within four minutes of downloading a high-definition movie on a 4G network, you can handle it.
In theory, there is no problem if the 4G downlink speed reaches 100M or more. However, this is theoretical data, which is achieved when a single terminal is not commercially available to large-scale users.
Once the 4G network is used to provide services to large-scale users, 4G networks will be affected by 4G rates due to multi-band construction and complex network environments. This theoretical limit is almost impossible to achieve unless the 4G base station is used by only one user.
4G network speed may be different in different periods
Although the 4G network speed in each place is not the same, and even the difference between speed and speed is very different, but do not think that this is an inherent difference in the construction of the base station. The actual situation is likely to be the slow speed of the Internet where many people, and fast speed Almost no one used.
In the initial stage of commercial use, the speed of the network should be ideal, because not many people use it; and as time goes by, the speed of the network may experience turbulence, because more people are connected at this time, and the base station construction has not yet However, with the large-scale growth of users, operators will adopt capacity expansion. During this period of time, there will be a steady rise in network speed, because the number of users and network speed are relatively stable at this time.
Subway and station no 4G signal?
If you take the subway or work in the city center, what's the signal?
One situation may be that there are too many people around you, and the instantaneous flow request is so large that you are "squeezed down."
The other situation is that there is really no signal. The phone shows 3G or even 2G. It is very likely that the base stations around you have not upgraded to 4G.
4G network next cell signal is also very fast
In fact, under the 4G network, the signal strength on the mobile phone has lost its significance. Although we can say that the full grid signal will certainly be faster than the one-line signal, but it is not strictly divided, the network speed is not accurate on the basis of the signal strength on the mobile phone, and how it is marked in the 4G era. Signal strength and speed, this is a problem that operators need to consider.
Since 4G does not change the number, why do you want to change the card?
Why do you need to change cards to use 4G? For ordinary users, the function of the SIM card seems to be to store telephones and text messages (phones and text messages are rarely in the SIM card), and it is difficult to think of any usefulness.
A closer look at the replaced USIM card reveals that the area of ​​the chip is larger. In fact, the SIM card plays an important role in identity recognition. Therefore, it must have an encryption function to ensure that identity privacy is not stolen. In the 4G era, the USIM card has assumed a higher level of encryption, which means it is more secure and less likely to be cracked.
The best way to reflect the 4G advantage is to watch live
Many people think that the killer application in the 4G era is online video. In fact, for online video, as long as the internet speed is maintained at 1.6-2.4Mbps, it can be enjoyed quickly. In the 3G era, this problem can be solved.
One of the major advantages of 4G applications is watching live broadcasts. The live broadcast of this application requires 48Mbps bandwidth. Currently, only 4G network speed can be satisfied. It is essentially different from online video. Therefore, the most changeable application scenario in the 4G era should be live broadcast.
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