In the 15 years of developing TD, it has gone through two generations of mobile communication standards-3G international standard TD-SCDMA and 4G international standard TD-LTE. The development of TD-SCDMA has laid the industrial foundation for TD-LTE. The development of TD-LTE has pointed out the direction for the upgrade of TD-SCDMA technology and the market. The two major standards complement each other and push forward the qualitative leap in the level of China's mobile communications. Recently, a reporter of "China Electronics News" interviewed Wen Kuo, director of the Science and Technology Department of the Ministry of Industry and Information Technology. He played a very important role in promoting the formation, development and industrialization of TD-LTE standards. He said: "In promoting the development of TD-LTE based on TD-SCDMA, our belief is to make the best technology and make TD more viable."
Frame structure
Convergence to achieve a win-win situation
The brewing of the TD-LTE standard started in 2005, formed in 2008 and became the international 4G standard in 2010. "In 2007, the development of TD-SCDMA encountered some difficulties, such as the lack of marketability, the weak ability of multi-vendor suppliers, the slow development of chips and the low participation of international enterprises, which constrained the development of TD-SCDMA "Wen Wen said," So we need to consider these issues in the design of TD-LTE, to find the direction for the subsequent development of TD-SCDMA, China Mobile as a TD-SCDMA operators have this demand. "
When discussing a new generation of mobile communications standards, there were proposals based on TDD technology in Europe, the United States and China at that time. The standard proposed by the United States was WIMAX. The standards in Europe and China were LTETDD. However, there were two solutions, many of which were difficult to coordinate , The main difference is that the frame structure of the two LTETDD standards is different. "In the beginning of the standard discussion, WiMAX developed very fast. Some companies that support WIMAX participated in the bidding for TDD spectrum. In Europe, they also bought the spectrum of TDD and plan to build WIMAX network. Even in Japan, South Korea, and Taiwan of China, there are networks and millions of users have been developed globally, and the only thing missing at that time was the support of large operators. "Wen Ku said:" It is against this background that both European and Chinese enterprises He thinks that we should accelerate the progress of technology integration and put forward that it is necessary to integrate the two technologies. The core issue of integration is the frame structure. "
Memories of the process of integration of the frame structure, smell the memory of that period of experience fresh. "In the meeting room of the Science and Technology Department, we held a meeting with the heads of technology of Datang, Huawei, ZTE, Putian, Telecommunication Research Institute and China Mobile to discuss the frame structure convergence. There were 3 solutions at that time. The A solution adopted the TD-SCDMA frame structure , Every 0.675 millisecond sub-frame; C program is the European camp LTEFDD frame structure, 0.5 ms sub-frame; B program with the above two frame structure is different, is based on the two frame structure scheme modified proposed.
Wen Ku said: "At that time we analyzed that changing to B and A would require restructuring for European companies and changing to Chinese firms B and C. However, it was impossible to change the European LTEFDD to A at the time Because LTEFDD has developed the product and can not give up what has been developed, and if we are to change, worry about our intellectual property rights, the original innovation will be affected, so we are under great pressure. "
Therefore, at this meeting, we first set the premise that changes in the frame structure should retain the existing research and development results as much as possible without affecting the intellectual property rights and should be as international as possible. "After intense discussion and unification of the opinions of various enterprises, we finally unified the frame structure into the current program under these two principles," Wenku said.
In the face of competition from other technologies, both China and Europe have agreed to cooperate in the determination of a LTETDD standard. Under the new frame structure, China has optimized TDD technology and led the development of TD-LTE technology standards. "Unifying the frame structure laid the foundation for the internationalization of TD-LTE. Without this integration, the subsequent development of TD-SCDMA will be very difficult," said Wen Ku.
At the beginning of promoting the integration of frame structure, all domestic parties hold different opinions on modifying the frame structure of TD-SCDMA. Wen Ku said: "These voices really give us a lot of pressure, but we think that if we do not promote integration, the future how to do? TD-SCDMA rushed to the summit without follow-up technology, can not see the future. A heart, worthy of the technology, to take on the conscience on the line, with the support of ministries and leaders, this is the case so set down .Finally, the fusion program by votes.
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