A Xinbei Ji with local license plates stopped in the yard in front of the Xinzhou Mobile Communications Company building. Two people got out of the car, one was about forty years old, and the other was twenty-seven or eight.

When the two walked into the building, the security guard stepped forward and stopped them. The young man said softly: "Director Hu Ming and Hu invited us here." The security guard asked them to wait, and then called the technology center. After confirmation, he

He smiled and said: "You two, please come in, Director Hu is waiting for you."

Hu Ming and Lin Chuan were waiting anxiously in the office. After the coordination of the Free Committee, the New State Bureau of National Security agreed to investigate the matter. Lin Chuan and Hu Ming would contact them for details. Lin Chuan's immediate boss

Director Wang Qian warned and urged that the investigation work should focus on the national security aspect, and he asked Lin Chuan to cooperate well. As for the mobile side, let alone the mobile side, in the final analysis, all this is for them.

"Director Ge? Hello!" Lin Chuan greeted warmly. Hu Ming also stepped forward to shake hands with the older man. He was Ge Xinyang, director of the Information Supervision Division of the Xinzhou Bureau. He introduced the young people around him with a smile.

: "This is our Xiaogao, Gao Xiaoliang."

After everyone sat down, Hu Ming gave an overview of what had happened recently. Lin Chuan also mentioned the importance of the Uncensored Committee on this matter and the importance of communication security, hoping to get strong help from the New South Wales Bureau.

After Ge Xinyang listened to the briefing, he nodded to Gao Xiaodian, as if to signal him to say something.

"Actually, we have noticed this situation, but we didn't care about it at first. After all, sometimes some maintenance and testing within the mobile company will cause temporary interruption of mobile signals in local areas, or the communication quality will be reduced. Until

The last time, because the accident area actually covered a small part of our Xinzhou Bureau, we discovered that this matter was not as simple as we originally thought. At the same time, we also concluded that these things had nothing to do with the mobile company, and

Someone is deliberately sabotaging it."

Hearing what Gao Xiaoliang said, Lin Chuan and Hu Ming's eyes couldn't help but light up. It seemed that the New State Bureau of National Security must have discovered some important clues.

Sure enough, Gao Xiaoliang said softly: "I read the materials you sent. You think someone designed and combined high-power signal jammers to interfere with communications. This is consistent with our initial judgment, but we quickly rejected it.

This idea was because Ge Chu and I were in the accident area at the time, and it was precisely in this way that we made an astonishing discovery."

Gao Xiaoliang talked for a long time but still didn't say what they found. This made Lin Chuan and Hu Ming anxious, but they couldn't rush them. Fortunately, Gao Xiaoliang's next words went directly to the topic.

"We found that the source of interference was not some high-power signal jammer as we originally thought, but our own mobile phone, which was in a non-call state, which is what you call a mobile phone in standby mode." Gao Xiaoliang said this.

After finishing, Lin Chuan and Ge Xinyang were both surprised, and Hu Ming opened his mouth wide: "How is that possible?"

Ge Xinyang said calmly: "Nothing is impossible. Mobile phones have the function of transmitting and receiving signals. Especially with the advancement of science and technology, it also has the function of connecting to the Internet. It can upload and download.

, since it can receive signals, why can't it transmit signals? Director Hu is from a technical background, so he doesn't understand this, right?"

Hu Ming smiled bitterly. He naturally understood this principle, but he also understood that in order for an individual mobile phone to complete the signal transmission, it must be realized through the mobile network. Because of frequency division duplex, the uplink and downlink are in different frequency bands.

, and the frequency band has also been set up for security. He feels that it should be impossible for someone to use a mobile phone to interfere with signals in the area.

Hu Ming whispered his doubts: "Even if it is true as you said, the transmission power of a single mobile phone is almost negligible, and it is impossible to cause signal interference or shielding in an area!" Gao Xiaoliang also looked bitter: "But

But they did it! They were not using just one mobile phone, but all the mobile phones in the standby state in that area, even those that were turned off. At that time, we immediately analyzed the interference signal, and we also discovered an even more terrifying one.

matter."

Lin Chuan and Hu Ming both stared closely at Gao Xiaoliang. What Gao Xiaoliang said had subverted their understanding of wireless communications. How could such a powerful person exist?

"During the program analysis of the interference signal, we found that it actually re-encoded the channel that you had originally encoded, making full use of the redundant bits to make the originally reduced rate slower. You all

Experts, you should understand what this means, right?"

When Gao Xiaoliang came here, he also looked at Lin Chuan and Hu Ming. Hu Ming nodded: "Of course I understand. By doing this, the robustness of the transmission will be further enhanced." Lin Chuan also suddenly realized: "In such a

In a highly fault-tolerant environment, as long as his interference signal conforms to the general frequency band of mobile communications, there is no need to consider the so-called security settings and directly enter the channel."

Ge Xinyang and Gao Xiaoliang nodded in unison, and Hu Ming said with a grimace: "Master, at least I don't dare to think about this. Even if I can think of it, I can't do it."

Ge Xinyang said lightly: "We couldn't imagine it, and we couldn't do it, let alone find it! Although an area is not too big, you know better than us how many mobile phones there will be. He just used these mobile phones to simultaneously

The signals with the same code and frequency band are transmitted, forming a closed loop to complete the signal interference! And he only needs a computer or a high-end smartphone to achieve this."

Lin Chuan frowned: "Can't we perform source tracking?" Gao Xiaoliang shook his head: "No, source tracking must be at the same time as it sends out interference signals, and the time required for a source tracking is about forty years.

We tried for seconds, but each time the tracking results pointed to different mobile phones in the area. Ge Chu also said just now that there are at least hundreds of mobile phones in this area, and he must have done the opposite.

Tracking settings, if we want to track the source, we must first go through all these hundreds of mobile phones. Time does not allow it at all. How much time does it take for hundreds of forty seconds? And each time his interference is only a few minutes.

matter!"

Hu Ming's eyes widened: "In other words, even your national security can't do anything about it?" Ge Xinyang sighed: "It can be said that the possibility is almost zero!" Lin Chuan said: "What should we do? Just let him go?

Ge Xinyang said: "Of course not. We don't know for what purpose he did this. Maybe it will endanger China's security as you said. Communications are no small matter and we cannot take it lightly. We have reported this matter to the department."

Here, the ministry has sent people to Xinzhou, I hope they can find a solution."

Xu Dajun glanced at Shu Yi who was talking to Zhu Yi in the rearview mirror. He already knew the identities of Shu Yi and others. He originally thought they were reinforcements brought in by Zhu Yi, but he didn't expect that they were here for another person.

It came from a case.

Zhen Nanfang sat in the passenger seat and looked at Xu Dajun who was driving with interest, and Xu Dajun also glanced at him. Two words came to Xu Dajun's heart, monster! Because Zhen Nanfang is too young.

, who is ridiculously young, less than 20 years old, and is actually a senior investigator of the 9th National Security Bureau. At that level, he is about the same as a deputy director in their bureau.

He didn't believe that Zhen Nanfang really had any ability. He thought that Zhen Nanfang was the son of some big family in Yanjing City, and he had fewer years of struggle than others due to the shelter of his ancestors.

Dongfang Xiao rushed to the hotel after receiving a call from Xu Dajun. It was not Zhu Yi who asked him to call Dongfang Xiao, but Dongfang Xiao himself. Dongfang Xiao didn't pay much attention at first, but later he heard that the person who came was actually

Zhu Yi's student, thinking about it, he decided to come and meet him. Although he didn't know much about Zhu Yi's past, he was somewhat curious that Zhu Yi's student had such a big background.

"Have you booked the accommodation?" Zhu Yi threw out a few cigarettes and asked softly. Shu Yi said "hmm": "The Xinzhou Bureau has already booked it for us. It seems to be recruiting in the city." Zhu Yi said:

"Why don't you guys stay with me? We can chat when we have nothing to do." Shu Yi didn't say anything, but gave Xiao Sheng a slight nod, and Xiao Sheng left the room to contact the Xinzhou Bureau.

While in the car, Zhu Yi also briefly talked about the suicide cases in Xinzhou, but neither Shu Yi nor Zhen Nanfang expressed their opinions. They also thought this case was very strange.

"Teacher, I personally think there are two key points in this case. One is the motive, and the other is the means. There are at least four groups of victims: students, police, psychologists, and tourists. If the first three are more or less

There can be some connection, but in the end the tourist completely messed up the murderer's target!" Shu Yi said softly.

Zhu Yi didn't say anything, and Xu Dajun sighed: "Because of this, we have no way at all. The only thing we can be sure of is the booklet." Zhennan said with a smile: "I heard you talk about that booklet many times along the way.

Booklet, but I'm confused, is a booklet really that scary?" Zhu Yi said to Xu Dajun: "Dajun, show them those booklets. In addition, you can also take a look at those two rooms.

Let’s straighten things up, they’ve been staying here for the past two days.”

Zhen Nanfang looked at the booklet for a long time and shook his head: "There is nothing weird about this booklet!" Shu Yi said: "This bright silver is a bit weird." Shu Yi raised his head: "But I also want to
Chapter completed!