Why does the 3G signal get worse on the train

Because the train is a vehicle running on the railway track, and usually the track has to pass through the mountains, forests, tunnels and other places, these places can not fully meet the conditions of communication with the base station, and such conditions must have the following three points:

The mobile phone is within the signal range of the base station.

The phone can send and receive signals.

The frequency bands of the two can be matched.

The big tower (base station) brings the signal to the mobile phone", this is true, but for people living in cities, the iron pole used to transmit signals (high-frequency radio waves) is not as large as expected, and its radiation is not as high. At the same time, the coverage capacity of small base stations is limited, and the scale of base stations is small, and the signal penetration is relatively weak. Therefore, in non-urban areas such as mountains, forests, and tunnels, it is impossible to receive signals.

Now one of the most difficult topics for mobile phone Internet access is how to catch the signal on the high-speed rail, your mobile phone is slightly better, at this time Apple and Samsung are not very good, but some domestic machines are good.

Railways pass through less densely populated areas most of the time. Communications may be well developed in these areas, but the network may still be relatively backward.

In the case of high-speed movement, the speed will be very slow, and the same will be on the subway, there is no solution, it will be better to access a higher-speed network, such as 4G, but it will be slower.

The mobile phone network is not good because the signal will be affected by various factors such as terrain, landform, and high-rise buildings during the propagation process. Here's how to deal with it:

1. Turn the phone on and off again and try again;

2. Swap the SIM card to a family member or friend's mobile phone and try again;

3. Check whether other Unicom users around you have signals;

4. If you can't solve the network signal problem, you can contact the local manual customer service for feedback.

If you have any questions, click here. Consultation.

The first point is to upgrade your network in a timely manner**. At the beginning of the emergence of 4G, some people did not want to upgrade 4G, and when the signal deteriorated to E, users began to upgrade**, so **must be upgraded in time.

The second point is the factor of the phone itself. Now some mobile phones still have certain requirements for mobile phone cards, and some mobile phones do not support 4G, so it leads to the situation of E signal after the 4G card is installed, you must pay attention when buying a mobile phone, if you buy a customized machine, you must pay attention to what network the mobile phone supports, if you buy a mobile 4G mobile phone, then it supports mobile 4G, and the others are likely to be 2G, 3G network.

The third point is the factor of the network operator. Due to China's wide area and large population, the popularity of 4G network is not very in place, and some areas have not yet used 4G, so our 4G mobile phone will have a bad signal and become E when it arrives in those places.

Fourth, the mobile phone card is cut. Some friends need to cut the card when changing the mobile phone, so if the mobile phone card is broken, then the mobile phone signal will always be in the e state, so you must pay attention when cutting the card.

Another point is that when entering an enclosed space such as an elevator or basement, an e-signal may appear. So don't be in a hurry at this time, as long as you get out of that area, the signal may get better.

The poor mobile phone signal on the train is not because there are few base stations along the way, the train moves too fast, etc., in fact, it is the window glass that causes the poor mobile phone signal on the train.

Studies have shown that the energy consumption of trains1 3 is used to control the temperature inside the carriages, with about 3% of the energy lost through the windows. In order to reduce heat loss, the temperature inside the cabin is maintained. Train windows are usually coated with an ultra-thin metallic coating on the glass.

This metallic coating allows light to pass through, but prevents heat from inside the cabin from escaping to the outside.

However, this coating, which is very useful for energy saving, has a drawback – it blocks cell phone signals. When the train carriage is made of metal and the windows are coated with metal, the entire carriage becomes a "Faraday cage" (a cage made of metal or good conductors). The Faraday cage can effectively isolate the electric field and electromagnetic interference inside and outside the cage, so it is difficult for electromagnetic signals to be transmitted to the cabin, and it is naturally not so good to use mobile phone signals in the carriage.

The mobile phone signal on the train is not good, the reason is that there are not many stations covered by the mobile phone network, plus the train skin is thick, and it often has to pass through tunnels and ravines, and if there is a problem with the station covering the tracks, it is very troublesome to deal with it on the spot, so there are many broken stations. In short: the railway line is long, the coverage is difficult, the coverage is not in place, coupled with the fast movement speed of the train, resulting in large changes in the wireless environment, large network fluctuations, and it is easier to give people a bad feeling of network signal.

In fact, in the few trains I have taken, although there will be **, there will be noise, slow Internet speed and other problems, but in general, normal communication can still be guaranteed

It's like the wifi on the upstairs of your house, when you use it downstairs, it works well with the door open, and it doesn't work so well when the door is closed because of the signal weakening due to the blocking of the train and magnetic field interference.

The speed of the train, the small number of base stations, coupled with the large number of mobile phones on the train, and the large number of signal sharing, lead to poor signals.

It has nothing to do with taking the train, I also have this experience, many trains have poor signals when they pass through some tunnels, many or the tracks are in the mountains, so the signal is poor.

It should be the electromagnetic wave that causes the mobile phone base station to be affected, which will cause the instability of the mobile phone signal.

The deterioration of the mobile phone signal is related to the mobile phone device, mobile phone processor and chip!

Mobile phone signals are electromagnetic waves, and steel can block the transmission of electromagnetic waves. The trains are all iron.

It's impossible, my house is next to the railway, and passing the train every day doesn't affect the signal.

Because the train carriage is made of metal, the electromagnetic signal of the mobile phone is weakened.

Maybe it's a coincidence. If someone else's phone has a signal, it's your phone problem.

Because the train is fast, it will affect your signal at that time.

Because of the blockage of the train and the interference of the magnetic field, the signal is weakened.

The signal on the train is poor, probably because the signal base station covers a small area!

Because the train has a shielding effect on the signal.

I think there are many caves, and the signal tower can't get in.

It should be because of the interference of electromagnetic waves.

The train had a poor signal on the way.

It should have been interfered with by the train signal.

Because the train covered the signal.