What does mobile phone disconnection mean?

Mobile phone outage mainly refers to the situation where the network is suddenly disconnected and unable to provide Internet services when using a mobile phone. Sometimes it is necessary to disconnect the mobile phone network or restart the mobile phone to alleviate the network signal problem. . The main reason for mobile phone disconnection is the baseband optimization problem of the mobile phone, so it will be repeatedly disconnected and reconnected when the baseband is switched, and the anti-interference ability is not strong.

The operating environment of this tutorial: HarmonyOS 2 system, HONOR V30 mobile phone.

When playing games, you will suddenly encounter situations where the lag becomes 460, the character is stuck and cannot be controlled, the game screen drifts horizontally, etc., which means the mobile phone is cut off.

What does mobile phone disconnection mean

Mobile phone disconnection mainly refers to the situation where the network is suddenly disconnected and unable to provide Internet services when using a mobile phone. Sometimes It is necessary to disconnect the mobile phone network or restart the phone to alleviate the network signal problem; this kind of disconnection often occurs when playing games, the delay suddenly increases, the character is stuck and cannot be operated, or when watching videos Unable to load videos, etc.;

The main reason for the interruption:

The interruption is mainly due to the baseband optimization problem of the mobile phone, so there will be repeated interruptions when the baseband is switched. Open reconnection, the anti-interference ability is not strong. If you encounter a problem with your mobile phone being cut off, you can check for the latest mobile phone system update to see if it can be resolved. Or search to see if it is a common problem with this model of mobile phone. You can only report the problem to the manufacturer, but consumers cannot solve it on their own.

Extended knowledge: Mobile phone baseband

The information sent by the information source (information source, also called the sending terminal) has not passed through The inherent frequency band (frequency bandwidth) of the original electrical signal that is modulated (spectrum moved and transformed) is called the basic frequency band, or baseband for short.

Baseband corresponds to frequency band. Frequency band: the frequency bandwidth occupied by the baseband signal after modulation (the difference from the lowest frequency to the highest frequency occupied by a signal)

• Baseband transmission:

  When baseband signals are directly transmitted in the channel, it is called baseband transmission. The system that performs baseband transmission is called a baseband transmission system. The entire channel of the transmission medium is occupied by a baseband signal. Baseband transmission does not require a modem, the equipment cost is small, and it has the advantages of high speed and low bit error rate. It is suitable for short-distance data transmission. The transmission distance is within 100 meters. It is used in audio local calls, It is widely used in computer network communications. In a wired channel, the signal transmitted when communicating directly with a teletype is the baseband signal. An enterprise or factory can use this method to connect a large number of terminals to the main computer. The baseband data transmission rate is 0~10 Mb/s, more typically 1Mb/s~2.5Mb/s, and is usually used to transmit digital information.

• Frequency band transmission:

  When frequency band signals are directly transmitted in the channel, it is called frequency band transmission. It can be transmitted over long distances. Its disadvantages are low speed and high bit error rate. Generally speaking, frequency band transmission is a digital baseband signal that is modulated and transformed into an analog signal that can be transmitted on a public telephone line. Analog signal After being transmitted to the receiving end through the analog transmission medium, it is restored to the transmission of the original signal. This kind of frequency band transmission not only overcomes the shortcomings of many long-distance telephone lines that cannot directly transmit baseband signals, but also enables multiplexing, thereby improving the utilization of communication lines. However, for frequency band transmission, modems must be installed at both the transmitting end and the receiving end to convert the baseband signal into a passband signal before transmitting it. The advantage of frequency band transmission is that it can facilitate the communication of a large number of existing analog channels (such as analog telephone switching networks). It is cheap and easy to implement. Dial-up Internet access for home users belongs to this type of communication.

  Signal

Baseband Signal(Baseband Signal)

The source (information source, also called the sending terminal) sends The original electrical signal that has not been modulated (spectrum shifting and transformation) is characterized by a low frequency. The signal spectrum starts near zero frequency and has a low-pass form. According to the characteristics of the original electrical signal, the baseband signal can be divided into a digital baseband signal and an analog baseband signal (correspondingly, the source is also divided into a digital source and an analog source.) It is determined by the source. To put it more simply, a baseband signal is a signal that directly expresses the information to be transmitted. For example, the sound waves we speak are baseband signals. (If a signal contains an AC component with an infinite frequency and a possible DC component, the signal is a baseband signal.)

• Since the attenuation of the baseband signal is not large in the short range, the signal content will not changes occur. Therefore, when the transmission distance is short, computer networks all use baseband transmission. For example, signals from computers to peripherals such as monitors and printers are transmitted via baseband. Most LANs use baseband transmission, such as Ethernet and Token Ring. The common network design standard 10BaseT uses baseband signals.

  Frequency band signal (passband signal)

  In communications, since the baseband signal has a very low frequency spectrum component, it is generally not suitable for direct transmission for the sake of anti-interference and improving the transmission rate. The baseband signal needs to be converted into a signal whose frequency band is suitable for transmission in the channel. After conversion The signal is a frequency band signal

  (If a signal only contains an AC component of one frequency or a limited number of frequency AC components, we call this signal a frequency band signal)

  Its other Mainly used for video broadcasting on Internet TV and cable TV.

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