The first thirty years of the 21st century were a period of rapid development of communication technology.
It can be seen from the data transmission speed that the development of communication technology has been a wave in the past thirty years.
When we just entered the 21st century, the second-generation mobile communication standard adopted had a user experience rate of data transmission of 10kbps, and even the theoretical peak rate was only 100kbps.
By the 1930s, when 6G communications were officially launched, its minimum usage rate had reached 500Gbps, which was five million times the highest rate thirty years ago!
Such data transmission speeds are still relatively science fiction for people who have just started to formulate standards.
"The biggest difference between the third generation of mobile communication technology and the second generation is that it can handle images, music and other media forms."
In the venue, a very young technician stood on the podium and talked.
"This is Zhou Chen from the Communications Research Institute. It is said that he has done a lot of work in the development of communications spectrum."
Yang Yi, who was sitting next to Zhang Xingyang, whispered to him the identity of the high-spirited young man on stage.
This meeting is the formulation meeting of the third generation communication standards.
Although it seems that this meeting has nothing to do with Zhang Xingyang, who has been responsible for rockets, missiles and other work.
However, Zhang Xingyang was deeply involved in the formulation process of technical standards.
Mainly because the formulation of communication technology standards is directly related to their research and development of next-generation communication satellites.
Therefore, even though he currently has many other important tasks, he still prioritizes participating in communication technology standard setting meetings.
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 research, we believe that domestic third-generation communication technology standards do not need to go through the intermediate link of 2.5 generations and can directly transition to 3G."
In the eyes of many people in the audience, the speech made by Zhou Chen on the stage could be regarded as an outrage.
After all, in developed countries where 3G standards already have many mature solutions, it is basically believed that it is necessary to use an intermediate technology to make the transition from 2G to 3G.
For example, many Western manufacturers, including Ericsson, Alcatel, Nokia, Lucent, Nortel, and even neighboring manufacturers such as NTT, Fujitsu, and Sharp, have been proposing GSM (2G)-GPRS-EDGE-WCDMA (3G). Technology advancement program.
Even Qualcomm, which uses short-frequency technology, although using different technical routes, believes that the transition to 2.5G is also necessary in communication technology.
This is why after Zhou Chen finished speaking, there was almost a burst of discussion in the audience.
Many people have even labeled Zhou Chen as uneducated and unskilled in their hearts.
"Our research is not groundless, we have done sufficient technical exploration."
"The current reason why the world is adopting 2.5G transition is mainly because it is temporarily unable to reach the transmission speed required by the 3G standard."
Faced with the disbelief of a large number of people in the audience, Zhou Chen was not angry. He also knew that what he just said was indeed a bit exaggerated in the eyes of people who were not clear about it.
But he has enough confidence in the technology that their technical team spent more than a year researching.
"We use a time division multiplexing synchronous code division multiple access method to increase the speed of communication transmission to a higher level."
The name of this technology seems complicated, but in fact it is not difficult to implement technically. It is mainly a matter of ideas.
As we all know, in communication systems, data is transmitted in both directions.
It's like a two-way road, with uploading and downloading available on both sides of the center line.
However, unlike roads with fixed road widths, the time division multiplexing synchronous code division multiple access technology used is equivalent to being able to freely set the center line of the road.
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 mode, the TDD technology we developed has great technical advantages in complex spectrum allocation situations. With the support of adaptive resource allocation and high-efficiency spectrum, it can support the rate from Various 3G services such as voice, video phone, and Internet from 100kb/s to 3Mb/s.”
The concept proposed by Zhou Chen and others is not complicated, so even many people in the audience who do not have an in-depth understanding of the details of communication technology can understand it.
"Director Jiang, this idea you proposed is quite good."
After Zhang Xingyang listened, he smiled and said 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 others are thinking about widening the road, they maximize the utilization of the original road by automatically changing links.
"These are nothing. We just made some technical changes. The key lies in the support of low-orbit communication satellites."
Although the corners of Jiang Hanshu's mouth raised crazily when faced with Zhang Xingyang's praise, he was still very modest when he spoke.
Of course, what he said is not wrong. Without the communication support of thousands of satellites, it would be impossible for them to make such a technical route.
It has to be said that the Communications Research Institute has conditions that other companies or research institutes that conduct communications technology research in the world do not have.
Because no country in the world has such a number of communication satellites in space.
If the communication conditions of the entire country are compared to doing things, it is a road.
So when other countries are still working hard to expand from two-way lanes to four lanes.
China is naturally a 32-lane super highway!
This is also the reason why Jiang Hanshu and the others are not in a hurry to do research on communication bandwidth expansion and development.
The conditions they now have are enough for them to delve into the next generation of communication technology standards based on this technical route, which is when 4G communication matures.
"How is the recent research on next-generation satellite communication terminals?"
More than half a year has passed since Zhang Xingyang last went to the Communications Research Institute.
After learning about the development of third-generation communication technology by the Communications Research Institute, Zhang Xingyang became more interested in satellite communication terminals.
After all, their technologies must be reflected in satellite communication terminals.
“The development is going quite smoothly so far.”
Jiang Hanshu did not give any bad news:
"We are currently developing cross-zone relay switching technology."
The application scenarios of this technology are mainly for busy mobile phone business or car users.
Because both require switching between different communication stations.
"The satellite communication terminal will roughly locate the user's direction and distance through the smart antenna."
“Satellites can use the user’s orientation and distance information to determine whether the user has moved to the coverage area of another satellite.”
"Then determine whether a switch is needed."
“If it is determined that a handover is necessary, the information will be transmitted to the other satellite and preparations for handover will be made.”
"The transfer will be synchronized with the identified base station before handover and reported to the network, and the handover will be completed by the automatic console."
Jiang Hanshu briefly explained their technical research on relay switching.
In fact, it can be seen from this technology that it is mainly used to solve the problems encountered by current communication systems.
Yes, the current low-orbit satellite communication system also has many problems.
Among these, the most serious problem is the communication saturation problem in megacities.
Take Donghai City, which has a permanent population of tens of millions, as an example. It has millions of mobile users.
Although dozens of communications satellites are deployed above the city, it is increasingly difficult to cope with its growing number of users.
Especially during the day when communications are more frequent, there are often insufficient number of frequency bands.
This results in a poor user experience when using it, that is, it takes tens of seconds to wait for an available communication frequency band to be used.
Although in the eyes of most people, such a short time is not a big deal, in the eyes of technicians like Zhang Xingyang and Jiang Hanshu, such a long wait is almost unbearable.
In fact, looking at the entire eastern region, the communication frequency band is completely sufficient for tens of millions of users.
Because in other cities, such communication saturation time is very short, and the peak user time period between each city is not exactly the same.
Therefore, if users can be allowed to switch between communication satellites, the number of users connected at the same time can be greatly increased.
When users make a call, they are actually the first to access the nearest communication satellite. However, due to 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 experience long wait times when making calls.
But now, the technology developed by Jiang Hanshu and others will greatly alleviate this situation.
After the current satellite frequency band is saturated, users will be automatically transferred to other nearby idle satellites.
Unlike ground base stations which are limited by the curvature of the earth and have difficulty in efficient long-distance transmission, satellite transmission itself is carried out in space and can complete signal switching more quickly and smoothly.
It’s not just signal switching problems that exist in bustling areas. Some vehicle-mounted satellite communications also have the same problem.
When a vehicle drives out of the communication range of one satellite, sometimes the next satellite has not yet completed communication due to its fast movement.
Under such circumstances, there will be a brief signal loss time.
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 the others still made targeted improvements to this situation.
"Before the user is about to leave the range of this satellite, based on 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 There was a call drop."
Jiang Hanshu explained the technical solution to Zhang Xingyang in detail.
"How is the current trial production situation of the new satellite personal terminal?"
After understanding the technical situation, Zhang Xingyang touched his stubbled chin and asked about production issues.
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 where the Communications Research Institute is located, a large-scale production park has been established.
However, compared to the industrial parks Zhang Xingyang had been exposed to before, this park is not very big, and its annual production value is not very high.
Especially compared to the carbon fiber material production base with an annual output value of hundreds of billions, this satellite terminal industrial park is still very small.
According to Zhang Xingyang's estimate, the annual net profit may be less than 100 million.
But this does not prevent Zhang Xingyang from attaching great importance to this satellite terminal industrial park.
Because in the future, after the Internet boom kicks off, the number of personal satellite terminals required every year will be in the hundreds of millions.
So even now the satellite terminal industrial park is still very small, like a seedling that has just sprouted.
But this does not prevent Zhang Xingyang from seeing him grow into a towering tree in the future.
"There are still some issues with the new generation of satellite terminals that have not been resolved, and production is not expected to begin until the end of the year."
Jiang Hanshu said to Zhang Xingyang with some embarrassment.
"However, the production situation of the previous generation of satellite terminals is still very stable."
After Zhang Xingyang heard this, he frowned.
Although satellite terminals are gradually becoming popular and have become a standard configuration of mobile phones.
However, the Institute of Communications does not have a monopoly now. Many domestic and foreign manufacturers have now begun developing 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 knew that the update speed in this area was very fast. If Jiang Hanshu and the others could not keep up with the tide of the times.
So even if they start the research and development and manufacturing of satellite personal terminals, what awaits them is to be ruthlessly abandoned by this era.
"The speed of research and development must be fast, and the research and development must be completed before other manufacturers have developed it."
Zhang Xingyang did not say what would happen if the research and development speed fell behind other manufacturers, but his meaning was obvious.
Lagging behind in research and development means that the market that they should have captured will be taken away by others.
Jiang Hanshu felt waves of fear when he saw that Zhang Xingyang had turned his attention to Zhou Chen who was having a heated debate with others on the stage.
Although Zhang Xingyang didn't say it explicitly, Jiang Hanshu had already felt a lot from it.
If they fail to seize the market, their early investment will be in vain.
You must know that most of the research institute's funds are used for the production of satellite terminals. Once it fails, they will need to face extremely bad situations.
It can be said that except for satellite communication equipment projects that will not be affected, all other projects will be severely impacted!
Zhou Chen on the stage completed their introduction on 3G technical standards and bowed politely to the audience, winning applause from the audience.
The 3G era has officially begun with the determination of technical standards! (End of chapter)
