How did WeChat send the message from your mobile phone to the other party?

Note: This article and this series are the popularization of IT basic knowledge, which is super simple and can be ignored by professionals.

When we watch some TV dramas or movies during the Republic of China, we often encounter some "phone calls". See if the old dial in the picture below reminds you of it?

At that time, the phone could not be connected directly, but was transferred through the "operator"

For example, if a wife is at home and wants to call her husband who works in a government building, she must dial this number first and then call the operator. The wife asked the operator to help connect the government building before hearing her husband's voice.

To put it bluntly, the two telephone lines are not directly connected. At that time, the technology was not enough to support the automatic connection of telephone lines, and the connection had to be done manually by the operator.

Nowadays, many families basically "eliminate" fixed telephones and replace them with mobile phones. In order to make it easier for everyone to understand, let's use the wired phone first.

When a wife calls her husband, she first connects to the operator's computer room through her home phone, where there are many devices that can receive and send signals.

At this time, my husband is not using a phone, but a mobile phone. What if there is no telephone line? The base station can solve this problem. The base station is connected to the operator's computer room through network lines, and the credit is transmitted to the husband through radio waves, so that the wife and husband can tell each other the truth.

Add a few questions:

? 1, are all telephone lines connected to the operator's computer room? Yes, it is.

? 2. Are the computer rooms of all operators interoperable? Right, right. Otherwise, how can China Mobile call Unicom?

? 3. Are all base stations connected to the operator's computer room? Yes, yes, base stations are usually connected through optical fiber networks. (There are also wireless connection schemes, but they should be used less. )

? 4. Does the mobile phone also receive and forward signals through the base station when making a phone call? be

My wife sent a message to her husband on WeChat, and her husband's mobile phone immediately received it? Isn't it amazing? It's not magical at all. It's much more advanced than traveling thousands of miles. Sound travels thousands of miles, only sound. Wechat can send voice, text, small videos and many emoticons. . . .

The message you sent was received by the other party because of radio waves. However, the radio waves here are network signals, while the early telephones are electrical signals. For example, the 5G we are using now is the latest standard of this radio wave.

The specific process is:

1, wife typing;

2. The mobile phone converts the message into radio waves and transmits them to the WeChat server; (What is a server? It's just that the computer is equipped with software, which records everyone's micro-signals and can automatically forward messages and many other functions)

3. The WeChat server forwards the received information to the husband's mobile phone;

You can receive the message on WeChat on your husband's mobile phone.

So what might happen if you send a message and your husband doesn't receive it?

1, the mobile phone is broken, your mobile phone and your husband's mobile phone;

2. Without the network, neither party can receive it without the network;

3. The computer room of WeChat is broken. If WeChat doesn't forward it for you, you will never send a message. . . Unless you type, just show your mobile phone to others.

If you have questions about servers and services, yes. What is this? In what way, how to send the information to each other accurately, without making mistakes, and hundreds of millions of people are using it, how can it be so powerful?

Please wait for the subsequent update ~ ~