What is the signal of the mobile phone on the bullet train Does the mobile phone have a signal on th

At present, the three operators have not achieved complete coverage of the 3G signal on the bullet train, especially the CRH5, which has basically no signal when driving.

The mobile signal on the 2G bullet train is the best, and the other two operators have not built a private network or are under construction nationwide, and they have not yet been built, and the signal is not good.

The 2G coverage of the Beijing-Tianjin high-speed railway is better, and I don't know anything else.

Even if there is a signal, the signal is very good, and when the speed is more than 250 kilometers, the signal will produce a Doppler shift, and multi-cell switching will also cause call anomalies.

So I still suggest that the landlord, on the bullet train, play less **, surf the Internet less, and rest more.

The mobile phone signal of the bullet train is relatively poor.

Reasons for poor mobile phone signal on the train:

1. Because the speed of the bullet train is as high as 250km per hour or above, the range of the mobile phone base station cannot keep up, so the mobile phone has to constantly change the base station, resulting in a bad mobile phone signal.

2. The electromagnetic signal of the EMU interferes with the mobile phone signal, which reduces the receiving frequency of the mobile phone signal, resulting in a bad mobile phone signal.

EMUs generally refer to rail vehicles that carry operating loads and have their own power, but in modern power concentrated EMUs, EMUs are closer to the locomotive role in traditional trains, and this kind of EMUs generally do not carry operating loads. In China, trains with speeds of up to 250 km/h or more are called "bullet trains". Since June 1, 2011, all bullet trains in the country have implemented a real-name ticket purchase system.

Since September 15, 2012, the national bullet train has uniformly adopted the combination of numbers and letters to compile the seat number.

Hello, in fact, as long as there is a signal, no matter how fast you move, it will not have much impact, if you want to say the signal, of course, it is better to move! If you use 3G, China Unicom's 3G is the most mature now, and China Mobile is the least mature, but Telecom's 3G is OK, the signal is also wide, and there is also a signal in the countryside, but China Mobile, China Unicom's 3G has no signal in the countryside, think about it yourself.

It's okay, three or four grid signals.

There is a signal, but it will be weak.

Because the high-speed rail can reach 300km h, and the Fuxing that has been put into operation can reach a speed of up to 350km h, the internal space of the high-speed rail is relatively closed, similar to an iron box, so that it must have a shielding effect on the signal, just like some elevators.

During high-speed operation, it will frequently switch between different base stations, and high-speed switching will lead to disconnection if the system is delayed.

Even if the mobile network is already fully covered along the high-speed railway, it is possible that the signal of your mobile phone changes too quickly and it is too late to switch back, so the signal is too weak or the connection is lost.

First of all, it must be the problem of signal coverage along the line. Since most of the high-speed rail routes are in the suburbs, there will be poor signal coverage in some areas, especially when passing through tunnels and areas surrounded by mountains. Signal coverage takes time and cost, after all, the input-output ratio has to be considered.

2. High-speed operation and high-speed switching base stationThe maximum speed of the bullet train will go to 250 kilometers per hour, the high-speed train will go to 300 kilometers per hour, and the Fuxing will reach 350 kilometers per hour. During high-speed operation, it will frequently switch between different base stations, and high-speed switching will break if the system is slightly delayed. Even if the mobile network covers the entire high-speed rail line, your mobile phone may be too fast to switch because the signal changes too fast, and it will temporarily lose connection.

3 Doppler effectThere is a relative motion between the car and you, the faster the car moves towards you, the more flat the sound waves between each other are squeezed, that is, the frequency becomes higher; And the faster the car moves away from you, the longer the sound waves between each other will be pulled, that is, the frequency will be lower.

I summarized the main reasons for the following:

1. China's railway network is long, and most of them are distributed in rural and suburban areas, with few base stations and insufficient coverage;

2. When the railway speed, the Doppler effect and the multipath effect will have a great impact on the signal quality;

3. When the train is running at high speed, the mobile phone signal needs to be quickly switched between different base stations, and the call may be dropped and the network may be disconnected if the switch is not timely;

4. The terrain through which the train passes is more complex, and mountains, tunnels, rivers and desert areas are not conducive to the construction of base stations, and these areas are prone to mobile phone service;

5. Generally, trains are iron carriages, and the body penetration loss is large. The loss is different in different positions, and the signal is better by the window.

Because in the process of running the EMU, it is often possible to run the signal far away because the EMU is in the process of running, and there is also a situation that there is basically no signal tower in an open place, so the signal uncle is very poor at this time.

When taking the train, the mobile phone signal will be very poor, because China's railway network is relatively long, most of them are distributed in rural and suburban areas, and the base stations are few and the coverage is insufficient, so it will lead to poor mobile phone signal.

Hello, the speed of the train is fast, and most of the distance is in the hole, so the signal is unstable, and sometimes the network is disconnected.

The reason why the mobile phone signal is weakened when the high-speed rail enters the station is due to the following:

1.The speed of high-speed rail is relatively fast: the speed of high-speed rail is generally 200 300 kilometers per hour, and the moving speed is fast, and the signal may be reflected many times when passing through obstacles at different distances and heights, resulting in weak signals.

2.High-speed rail tunnels: High-speed rail lines often pass through mountainous areas or have tunnels, if the distance between the mobile phone and the base station increases when entering the tunnel, the signal will become weaker or even cut off.

3.Simultaneous connection of a large number of mobile devices: High-speed rail has a wide field of vision, usually with many seats, and the signal may experience multiple reflections, interference and fading when entering the station, plus a large number of people passing through the station use mobile devices such as mobile phones and tablets, and multiple devices connected at the same time may lead to signal congestion and loss.

In short, there are many reasons why the mobile phone signal is weakened when the Zenchen high-speed rail enters the station, including the speed of the high-speed rail, the high-speed rail tunnel, signal interference, and the simultaneous connection of a large number of mobile devices. While some technologies can improve the quality of the mobile device's signal, on high-speed rail, the quality of the signal is affected by a variety of different factors, so it is difficult to crack to solve it completely.

There are generally signals on the train, but some trains will pass through long tunnels and ravines, if there is no signal coverage in the long tunnel, then there may be no signal, or there are fewer base stations in the mountains, the coverage is not enough, and the mountains also have a shielding effect on the signal, resulting in a weaker signal.

The factors that affect the mobile phone signal are the communication base station.

In case it can't be loaded because of a bad signal.

Now some high-speed railways also come with free Wi-Fi, even if the mobile phone has no signal, you can also browse the web page, send messages, etc.

I summarized the main reasons for the following:

1. China's railway network is long, and most of them are distributed in rural and suburban areas, with few base stations and insufficient coverage;

2. When the railway speed, the Doppler effect and the multipath effect will have a great impact on the signal quality;

3. When the train is running at high speed, the mobile phone signal needs to be quickly switched between different base stations, and the call may be dropped and the network may be disconnected if the switch is not timely;

4. The terrain through which the train passes is more complex, and mountains, tunnels, rivers and desert areas are not conducive to the construction of base stations, and these areas are prone to mobile phone service;

5. Generally, trains are iron carriages, and the body penetration loss is large. The loss is different in different positions, and the signal is better by the window.

Recently, I have been using my mobile phone a lot on the train, but I have found that the quality of the mobile phone signal is very poor. During the train journey, the mobile phone signal was always unstable, and I was often disconnected or unable to connect, which caused me a lot of trouble. Why is my phone not getting a good signal on the train?

First of all, the train travels at a relatively fast speed, which can lead to an unstable signal strength. When a train passes through an area, the cell phone signal may suddenly weaken or disconnect, because the area where the train passes through has a limited coverage area of cell towers, and if the cell phone is in the area, it is easy to have a bad signal.

Secondly, while the train is moving, the mobile phone will constantly switch signal towers, which will also cause the signal to be unstable. When a cell phone moves from the range of one cell tower to the area of another, the phone will automatically switch to the new tower, which may result in signal interruptions or unstable connections.

In addition, the geographical and digital environment of the train can also affect the quality of the mobile phone signal. For example, when a train is traveling in a mountainous area or in a tunnel, the signal is obscured by the terrain and buildings, resulting in a decrease in signal quality.

To sum up, there are many reasons why my phone has a bad signal on the train, including factors such as the speed of the train, the coverage of the signal tower, signal switching, and the geographical environment. If you need to maintain a good mobile phone signal quality, it is recommended to use your mobile phone in an area with a good signal when riding the train, or use a special mobile phone signal booster to strengthen the signal.

There are generally signals on the train, but some trains will pass through long tunnels and ravines, if there is no signal coverage in the long tunnel, then there may be no signal, or there are fewer base stations in the mountains, the coverage is not enough, and the mountains also have a shielding effect on the signal, resulting in a weaker signal.

The factors that affect the mobile phone signal include the location of the communication base station, the transmitting power of the base station, and the quality of the hand bridge machine itself.

Now some high-speed railways also come with free Wi-Fi celebrations, even if there is no signal on the mobile phone, you can also swipe the web, send messages, etc.