Want to ask about the current situation of 3G development in China?

In 2007, there were few bright spots in the steady development of China telecom industry, but the TD-SCDMA technology experiment in 10 city was a creative and shocking bright spot in the picture of China telecom industry. Looking forward to 2008 and the next 5- 10 years, 3G in China will start with TD-SCDMA and develop rapidly. The evolution of 3G will continue to advance to the forefront of mobile communication by integrating advanced technologies on the premise of independent innovation. In China, it is WiMAX that has an impact on 3G and its enhanced technologies. Like a "dark horse", it is accelerating the process of broadband and mobileization. In particular, mobile WiMAX(IEEE 802. 16e) has formally applied to the International Telecommunication Union (ITU) to become a 3G standard, expecting to obtain a globally unified 2.5GHz frequency band. At the ITU World Radiocommunication Plenary Meeting of June 65438+1October 19 this year, WiMAX was adopted as the new 3G standard in the world by absolute advantage. Although it still needs the final approval of the World Radiocommunication Conference held in Geneva this year, the momentum of WiMAX becoming a 3G standard is unstoppable. WiMAX802. 16m standard launched at the end of last year is oriented to IMT-Advanced(4G) and wants to compete with LTE and UMB evolved from 3G. However, WiMAX got a cold shoulder in China. Recently, officials of the Ministry of Information Industry also made it clear that WiMAX has not been launched as a mature product due to many disputes in technology and products. Correspondingly, in the IMT-Advanced(4G) spectrum scheme submitted by China to ITU, the 2.5GHz band is also regarded as the required frequency of 4G, thus denying the possibility that China will allocate this frequency to WiMAX. It can be seen that China insists on taking 3G and its evolution technology as the leading industry, so WiMAX is unlikely to exist as a mobile communication industry until TD is commercialized on a large scale and the 3G industrial chain grows. 3.3G evolution in the continuation and strengthening of independent innovation. At present, there are three paths for 3G evolution. One is the technical track based on 3GPP, that is, from the second generation GSM and 2.5 generation GPRS to the third generation WCDMA, the third generation enhanced HSDPA, HSUPA and LTE, and finally to IMT-Advanced, that is, B3G/4G. The second is the technical route based on 3GPP2, that is, from the second generation CDMA2000 to the second generation CDMA2000 1X, to the third generation CDMA2000 1X EV-DO, and the long-term evolution of UMB upgrade, and finally to B3G/4G. These are two mainstream routes in the evolution of mobile communication, and they also occupy the vast majority of the world mobile communication market. The third is the technical route based on WiMAX, which is the result of the evolution of broadband wireless access technology to high mobility and high quality of service. However, the situation of mobile WiMAX is much more complicated. As a brand-new technology based on IP mobile network, it is not a gradual upgrade of the existing technology like 3G, nor has it been tested in a real mobile complex environment. Another uncertain factor is that WiMAX has no global uniform and sufficient spectrum support, especially in China, and no WiMAX frequency plan has been approved. Although LTE, UMB and mobile WiMAX are different, they also have some similarities. These three systems all adopt OFDM and MIMO technologies to provide higher spectrum utilization. In the process of future development and evolution, which technical route will win will be the result of the game of political, economic and scientific and technological forces in various countries. However, LTE, UMB and mobile WiMAX do not belong to the fourth generation mobile communication technology. At the Helsinki meeting of ITU-R WP8F working group in June 2005, the fourth generation mobile communication technology (B3G/4G) was officially named IMT-Advanced. ITU will complete the standardization development of IMT-Advanced technology in three years, and then complete the process of standard improvement and product commercialization in two to three years. IMT-Advanced technology will become the mainstream mobile communication technology in the next 5 ~ 15 years. China's 3G evolution route has also been defined, that is, to further improve China's independent innovation and core competitiveness in the field of mobile communication, formulate and launch the 3G evolution technology route based on TD-SCDMA, and achieve greater success in IMT-Advanced technology. After many meetings and numerous discussions and scheme integration by domestic and foreign manufacturers, in June 2005, 1 1, the TD-SCDMA evolution scheme of OFDM jointly promoted by Datang and China enterprises was accepted by 3GPP, which means that TD-SCDMA system can smoothly evolve to LTE. 3GPP recently launched an evolved version of LTE TDD system. In the LTE TDD Type 2 version, most of the existing core technologies of TD-SCDMA, such as smart antenna and physical process design based on frame structure, are inherited, which constitutes the LTE+ TDD scheme for further evolution of TD-SCDMA. In this scheme, the expansion and enhancement of TD-SCDMA characteristic core technology is organically combined with mainstream technologies of MIMO and OFDMA, which significantly improves the performance of MIMO OFDMA system, including physical processes such as BR-OFDMA, multi-stream MIMO based on smart antenna, joint detection based on BR-OFDMA, frame structure synchronization based on TD-SCDMA evolution, cell search, random access and paging. On the basis of OFDMA+MIMO*** technology and existing standards, the system performance is further improved, including multi-user joint mapping, layered modulation, soft frequency reuse, LDPC coding, relay and distributed antenna, layered MIMO technology for MBMS, etc. Through arduous domestic and international games, the strategic problem of long-term independent evolution of TD-SCDMA LTE has been basically solved, and China continues to hold the core intellectual property rights of TD-SCDMA LTE. In the continuous evolution to 4G technology, based on the long-term independent evolution strategy of TD-SCDMA LTE, a number of technological innovations with intellectual property rights have been formed, which has created favorable conditions for actively forming 4G standards with independent innovation characteristics. China government has also made it clear that it will continue to promote the continuous maturity and commercialization of TD-SCDMA on the existing basis. It is necessary to promote the implementation of policies to encourage independent innovation in the information industry and strengthen planning guidance; Continue to implement the standard strategy and strengthen the formulation of information industry standards. An official of the Ministry of Information Industry recently said, "We should not only see that our generation has TD, but also think of providing an idea to build our country's innovation capability for the whole people, our industry, operators and manufacturers." Therefore, the 3G autonomous evolution route with TD as the core has been identified as the main trend of China mobile communication in the future. 4. Conclusion In 2008 and beyond, even if mobile WiMAX is approved as the 3G standard by ITU, China will continue to develop along the mature and growing TD-SCDMA industry and the 3G autonomous evolution route with TD as the core, advocate the future broadband mobile communication technology and standard with independent innovation, and strive for a greater breakthrough in the 4G era.