The first three decades of the 21st century were a period of rapid development of communication technology.

From the speed of data transmission, it can be seen that in the past 30 years, the wave of communication technology development.

In the 21st century, the second-generation mobile communication standard adopted the user experience rate of data transmission is 10kbps, and even the theoretical peak rate is only 100kbps.

In the thirties of the 21st century, when 6G communication was officially launched, its minimum usage rate has reached 500Gbps, which is five million times the highest rate 30 years ago!

This kind of data transfer speed is still relatively sci-fi for people who are just beginning to develop standards.

"The biggest difference between the third-generation mobile communication technology and the second-generation is that it can process media forms such as images and music."

In the room, a very young technician stood on the podium and talked eloquently.

"This is Zhou Chen from the Communications Research Institute, and it is said that he has done a lot of work in the development of communication spectrum."

Yang Yi, who was sitting next to Zhang Xingyang, whispered to him the identity of the high-spirited young man on the stage.

This meeting is the development of the third generation of communication standards.

Although it seems that this meeting has nothing to do with Zhang Xingyang, who has been in charge of rockets and missiles.

However, Zhang Xingyang was still deeply involved in the process of formulating technical standards.

The main reason is that the formulation of communication technology standards is directly related to the research and development of their next-generation communication satellites.

Therefore, even though he has a lot of other important work at the moment, he still has priority to participate in the communication technology standards development meeting.

In Zhang Xingyang's mind, he still hopes to make some precise adjustments to the technical standards of the third-generation communication technology to adapt to their current situation.

"And after our research, we believe that the domestic third-generation communication technology standards do not have to go through the intermediate links of the 2.5 generation, and can directly transition to 3G."

In the eyes of many people in the audience, Zhou Chen's speech on the stage can be regarded as a violent remark.

After all, in developed countries where there are many mature solutions for 3G standards, it is basically believed that in the process of moving from 2G to 3G, it is necessary to adopt an intermediate technology for the transition.

For example, many manufacturers in the West, such as Ericsson, Alcatel, Nokia, Lucent, Nortel, and even neighboring NTT, Fujitsu, Sharp and other manufacturers, have been proposing GSM (2G)-GPRS-EDGE-WCDMA (3G) technology promotion schemes.

Even Qualcomm, which uses short-frequency technology, believes that the transition to 2.5G is necessary for communication technology, although it is a different technology route.

This is also the reason why after Zhou Chen finished speaking, the audience almost resounded with a voice of discussion.

There are even many people who have labeled Zhou Chen as unlearned and unskilled in their hearts.

"Our research is not groundless, we have done a full technical exploration."

"The main reason for the world's 2.5G transition is that it will not be able to reach the transmission speed required by the 3G standard for a while."

In the face of the disbelief of a large number of people in the audience, Zhou Chen was not angry, he also knew that what he just said, in the eyes of those who did not know, was indeed a bit exaggerated.

But he has enough confidence in the technology that their technical team has spent more than a year researching.

"We use a time-division multiplexing synchronous code division multiple access method to improve the speed of communication transmission to a higher level."

The name of this technology seems to be complicated, but in fact, it is not very difficult to implement the technology, and it is mainly a matter of thinking.

As we all know, in communication systems, data is transmitted in both directions.

It's like a two-way street, with uploads and downloads on both sides of the centerline.

However, unlike roads with fixed road widths, the time-division multiplexing synchronous code division multiple access technology used is equivalent to the free development of the road centerline.

In this way, for the broadband of two-way data transmission, the required uplink and downlink can be automatically allocated according to the user's communication situation.

"Compared with the existing FDD model, the TDD technology we have developed has great technical advantages in complex spectrum allocation, and with the support of adaptive resource allocation and high-efficiency spectrum, it can support various 3G services such as voice, video telephony, and Internet with speeds from 100kb/s to 3Mb/s."

Zhou Chen's concept is not complicated, so even many people in the audience who do not know the details of communication technology can understand it.

"Director Jiang, it's a good idea that you put forward."

After listening to it, Zhang Xingyang said with a smile to Jiang Hanshu, who was sitting on the other side of him.

This development route of the Communications Research Institute is indeed a fantastic idea.

While everyone else was thinking about widening the road, they were able to maximize the utilization of the original road by automatically changing the link.

"It's nothing, we've just made some technical changes, and the key is the support of low-orbit communication satellites."

Although in the face of Zhang Xingyang's praise, the corners of Jiang Hanshu's mouth rose wildly, but he was still very modest when he spoke.

Of course, what he said is not wrong, without the communication support of those thousands of satellites, it is impossible for them to make such a technical route.

It has to be said that the conditions of the communication research institute are not available to other companies or research institutes that conduct communication technology research in the world.

Because no country in the world has such a number of communication satellites in space.

If the communication conditions of the whole country are compared, than doing things is a road.

Then at a time when other countries are still trying to expand to four-lane lanes in two-way lanes.

The country is born to be a 32-lane super boulevard!

This is also the reason why Jiang Hanshu and they are not in a hurry to do research on communication bandwidth expansion and development.

The conditions they have now are enough for them to delve into the next generation of communication technology standards on this technical route, that is, when 4G communication is mature.

"How is the research on the next generation of satellite communication terminals?"

It has been more than half a year since Zhang Xingyang last went to the Institute of Communications.

After learning about the development of the third-generation communication technology by the Communications Research Institute, Zhang Xingyang became more interested in satellite communication terminals.

After all, these technologies of theirs are to be embodied in satellite communication terminals.

"So far, the development is going well."

Jiang Hanshu didn't give any bad news:

"We have recently been working on the development of cross-zone relay switching technology."

The application scenarios of this technology are mainly mobile phone business busy, or vehicle users.

Because both of these need to be switched between different communication stations.

"The satellite communication terminal will roughly locate the user's location and distance through the smart antenna."

"The satellite can use the user's location and distance information to determine whether the user has moved to the coverage area of another satellite."

"Then determine if you need to make a switch."

"If it is determined that a switch is needed, the information will be transmitted to another satellite and the switch will be prepared."

"The transfer will be synchronized with the identified base station before the cross-zone handover, and the network will be reported to the cross-zone switch, and the cross-zone handover will be completed by the automatic console."

Jiang Hanshu briefly explained their technical research on relay switching.

In fact, it can also be seen from this technology that it is mainly to solve the problems encountered by the current communication system.

Yes, the current low-orbit satellite communication system also has a lot of problems.

Among them, the most serious problem is the problem of communication saturation in megacities.

In Tokai City, which has a permanent population of tens of millions, there are millions of mobile users.

Although dozens of communications satellites are deployed on top of the city, it is becoming increasingly difficult to cope with its growing number of users.

Especially during the day, when communication is frequent, the number of frequency bands is often insufficient.

This causes users to have a poor experience when using it, that is, it takes tens of seconds to wait for a communication band to be used by him.

Although in the eyes of most people, such a small amount of time is not a big deal, but in the eyes of technicians like Zhang Xingyang and Jiang Hanshu, such a long wait is almost unbearable.

In fact, from the perspective of the entire eastern region, the communication frequency band is completely sufficient for tens of millions of users.

This is because in other cities, this traffic saturation period is very short, and the peak user hours are not exactly the same between cities.

Therefore, if users can switch between communication satellites, then the number of users who can access at the same time can be greatly increased.

When a user makes a call, it is actually the first to access the nearest communication satellite, but because of the population density, there are always a few satellites whose frequency bands are full almost all the time.

This is also an important reason why users in these areas will have long wait times to make calls.

But now, the technology developed by Jiang Hanshu and them will greatly alleviate this situation.

When the current satellite band is saturated, users will be automatically transferred to other nearby free satellites.

Unlike ground base stations, which are limited by the curvature of the earth and are difficult to transmit efficiently over long distances, satellite transmission itself is carried out in space, which can complete signal switching more quickly and smoothly.

Not only does it have the problem of signal switching in prosperous areas, but also some on-board satellite communications.

When the vehicle drives out of the communication range of one satellite, sometimes the next satellite has not completed the communication due to the fast moving speed.

In this case, there will be a short signal loss period.

In fact, this time is very short, only a few seconds at most.

For almost everyone at this time, they didn't pay much attention to this problem.

However, Jiang Hanshu and them still made improvements to the nature of this situation.

"Before the user is about to get out of the range of this satellite, according to the positioning information of the smart antenna, the satellite will automatically calculate the next satellite closest to the user, and complete the signal transfer between the two to ensure that the user's communication will not drop the call."

Jiang Hanshu gave Zhang Xingyang a detailed explanation of the technical solution.

"How is the trial production of the new satellite personal terminal now?"

After learning about the technical situation, Zhang Xingyang touched his chin with stubble and asked about the production problem.

After confirming that the Communications Research Institute would not be involved in the production of mobile phones, Zhang Xingyang positioned them as a parts supplier.

And in the city of the Institute of Communications, a large-scale production park has also been established.

However, compared with the industrial park that Zhang Xingyang has contacted before, this park is not very large, and the annual production value is not very high.

Especially compared with the annual output value of tens of billions of carbon fiber material production base, this satellite terminal industrial park is still very small.

In Zhang Xingyang's estimates, there may be less than 100 million net profits per year.

However, this does not prevent Zhang Xingyang from attaching importance to this satellite terminal industrial park.

Because in the future, after the Internet tide kicks off, the annual demand for personal satellite terminals will be in the unit of 100 million.

Therefore, even if the satellite terminal industrial park is still very small, it is like a seedling that has just sprouted.

But it does not prevent Zhang Xingyang from seeing him grow into a towering tree in the future.

"There are still some problems with the new generation of satellite terminals that have not been solved, and it is expected that production will not start until the end of the year."

Jiang Hanshu said to Zhang Xingyang with some embarrassment.

"However, the production of satellite terminals of the previous generation is still very stable."

After Zhang Xingyang listened, he frowned.

Although satellite terminals are now gradually becoming popular, they have become the standard configuration of mobile phones.

However, the Communications Research Institute is not able to monopolize it now, and many domestic and foreign manufacturers have now begun to develop their own satellite personal terminals.

Maybe their current progress is not very good, so they have not attracted Jiang Hanshu's attention.

But Zhang Xingyang knows that the speed of renewal in this regard is very fast, and if Jiang Hanshu can't keep up with the tide of the times.

So even if they start the R&D and manufacturing of satellite personal terminals, what awaits them is only to be ruthlessly abandoned by this era.

"The speed of research and development must be fast, and it must be completed before other manufacturers have developed it."

Zhang Xingyang did not say what would happen if the R&D speed lagged behind other manufacturers, but his meaning was obvious.

Backward R&D means that the market that should have been seized by them will be grabbed by others.

Jiang Hanshu looked at Zhou Chen, who had already shifted his attention to Zhou Chen, who was having a heated debate with others on stage, and felt a burst of fear.

Although Zhang Xingyang didn't say it explicitly, Jiang Hanshu had already felt a lot of things from it.

If the market seizure fails, then their early investment will be wasted.

You must know that for the production of satellite terminals, most of the funds of the institute are used, and if they fail, they need to face extremely bad conditions.

It can be said that at that time, except for the satellite communication equipment project, which will not be affected, all other projects will be violently impacted!

Zhou Chen on the stage completed their introduction to 3G technical standards and bowed politely to the audience, winning the applause of everyone in the audience.

The 3G era, along with the determination of technical standards, has officially kicked off! (End of chapter)