As a basic and leading industry, mobile communication is the carrier of new industries, such as mobile Internet, Internet of things, intelligent manufacturing, and so on. It is very important to realize autonomous controllable network and information security. Before the 4G, China's mobile communication has undergone the process of 1G, 2G and 3G follow the blank of breakthrough, although the 3G proposed TD-SCDMA (time division synchronous code division multiple access) technology and an international standard, but compared with WCDMA, CDMA2000 and other international mainstream technology, TD-SCDMA in the industrial scale and international commercial obvious gap in the edge of the whole. In 2005, 4G launched the study of global, international competition is fierce, Europe continues to be the mainstream of long-term FDD (frequency division duplex: transmitting and receiving data requires two independent frequency channel) technology path, the United States strongly promote the WiMAX (a cover further enhanced WiFi Technology), trying to seize the TDD (time division duplex: emission and the received signal is different time slot on the same frequency channel in each other, by a certain time to ensure separation path). At this time our country if not able to compete with the 4G technology, 3G era efforts and lay the TDD technology industrial base will be cast to the wind. Study on TD-SCDMA in China in recent ten years based on that TDD has flexible spectrum, high efficiency and potential advantages, and China in the TDD path have deep accumulation, so the proposed innovative OFDM (orthogonal frequency division multiplexing) combined with TDD TD-LTE (4G TDD or LTE TDD) technology, and carried out research the key technology and application work.
In the "major new generation broadband wireless mobile communication network" National Science and technology projects (hereinafter referred to as the "special three") under the support of the project created throughout the entire process, part of the three innovation platform for top-level design, system layout, promote synergy. First, 4G propulsion group as a standardized propulsion platform, innovative "front and back" cooperation mechanism, the background extensive collection, evaluation technology, front coordination operations, to promote China's proposals into international standards. Two is the TD-LTE working group, market-oriented, to technology roadmap, specifications, testing as the starting point, to open up the whole industry chain links. Three, initiated by China Mobile, established the Global TD-LTE Initiative (TD-LTE global development initiative) International Industry Alliance, becoming the first international promotion platform for China's communications field.
The project in the process of promoting the breakthrough of several major technical problems, research and development of a variety of high-end products, to capture the complex environment of network construction and operation challenges and built test platform, the whole industry chain is constructed with political research collaborative innovation system.
One is to capture TDD high-speed mobile broadband, large capacity and other problems, originally puts forward the technology system of TDD, orthogonal frequency division multiplexing and intelligent multi antenna scheme based on multiple TDD win in the global competition in the technical proposal, become one of the world's two major 4G standards, leading the global development of mobile communication technology and industry upgrade path.
The two is to capture high-speed, large bandwidth, low power consumption, multi-mode multi frequency interference 4G complex product development problem, developed a high degree of integration of 28nm TD-LTE five die ten frequency chip, TD-LTE intelligent mobile phone, a full range of base station and testing instrument, whole industry chain to achieve leapfrog development, reached the international advanced level.
The three is in high frequency band spectrum, dispersion, electromagnetic interference, complex geographical environment and the complexity of the scene such as TD-LTE network construction and operation of the challenge, put forward efficient interference control technology, system optimization, coverage and user experience of the network planning scheme based on the theory and demonstration, to create a leading global 4G network.
Four is a breakthrough in TD-LTE industry links, the key link is weak, testing is difficult to create a bottleneck, covering technology, system, network test theory, method and evaluation system, and developed a test platform covering the whole industry chain, the core role in accelerating development and industrialization process.
The five is to create a standard, promote industrial cooperation, international promotion platform, build a new political research collaborative innovation system, promote the TD-LTE standardization, industrialization and internationalization, is a successful practice of industrial organization innovation system construction under market economy system in china.
The project won the 2016 National Science and technology progress special award, 5610 patents, has authorized 2992, 33 patents were named China Patent Gold Award and outstanding award. By the end of 2015, has been extended to 76 TD-LTE network operators in the United States and Europe, Japan and other 43 countries and regions, TD-LTE has 470 million users, accounting for the global 4G half of the country, the realization of China's leading technology for the first time in the world wide application, but also for the first time in the global large-scale application of TDD technology. TD-LTE is driven by China's mobile communication industry chain into the international advanced level, China's enterprises for more than 50% of global 4G base station; intelligent terminal in the world top five in three seats; in the global high-end LTE chip, Hass and Spreadtrum in the top five, shipments accounted for 16%. 2013 to 2015, the direct output value amounted to 1 trillion and 290 billion yuan, especially in 2015 downtown pressure on the economy increasing, TD-LTE explosive growth, driven by the rapid development of industry and the "Internet plus" emerging applications, the total economic contribution of 821 billion yuan, accounting for 9.6% of the growth of GDP.
Chinese Academy of Engineering in the third phase of the assessment of the special, TD-LTE highly praised: think in the TD-LTE and other independent innovation strategy direction, leading the industry to achieve a breakthrough in the core generic technology. TD-LTE and a series of major symbolic achievements, become 4G international standards, to seize the "standardization" commanding heights".