Describe the contribution of the new TD SCDMA standard to modern mobile communications in the future

Answer]: BTDD-LTE and FDD-LTE are only different in frame structure, the modulation mode data channel is QPSK, 16QAM, 64QAM, the control slag channel uses BPSK, QPSK, and the modulation mode of the control channel is fixed. The LTE standard consists of two different duplex modes, TDD stands for Time Division Duplex, that is, the uplink and downlink are crossover according to the time allocation on the same frequency band; FDD, on the other hand, is performed simultaneously in different frequency bands at the uplink and downlink.

On December 4, 2013, the Ministry of Industry and Information Technology officially issued 4G licenses to the three major operators. China Mobile, China Unicom,

The first batch of telecom companies have obtained TD-LTE network business licenses, and LTE FDD licenses have not yet been issued. On February 27, 2015, the Ministry of Industry and Information Technology (MIIT) officially issued a document to issue the second 4G business license, namely FDD-LTE license, to China Telecom and China Unicom.

Answer]: BTDD-LTE and FDD-LTE are only different in the frame structure, the modulation mode data channel is QPSK, 16QAM, 64QAM, the control channel is BPSK, QPSK, and the control channel modulation mode is fixed. The LTE standard consists of two different duplex modes, TDD stands for Time Division Duplex, that is to say, the uplink and downlink are crossover according to the slag time allocation in the same frequency band; FDD, on the other hand, is carried out at the same time at different frequencies in the uplink and downlink branches.

On December 4, 2013, the Ministry of Industry and Information Technology (MIIT) officially issued 4G licenses to the three major operators. China Mobile, China Unicom,

The first batch of telecom companies have obtained TD-LTE network operation licenses, and LTE FDD licenses have not yet been issued. On February 27, 2015, the Ministry of Industry and Information Technology (MIIT) officially issued a document to issue the second 4G business license, namely FDD-LTE license, to China Telecom and China Unicom.

TD-SCDMA is the abbreviation of English Time Division-Synchronous Code Division Multiple Access (Time Division-Synchronous Code Division Multiple Access), the third-generation mobile communication standard (referred to as 3G) proposed by China, and one of the three 3G standards approved by the ITU. It is an important milestone in the history of China's telecommunications. (Compared to the other two main 3G standards, CDMA2000 and WCDMA, it started late and the technology is not mature enough).

TD-SCDMA's patents are mainly distributed in the hands of Nokia (32%), Ericsson (23%), Siemens (11%), and Datang (7%). In January 1998, the Xiangshan Conference was held as scheduled. This is a crucial meeting for the submission of candidate technologies and the identification of China's 3G candidate technology strategy.

At the meeting, professors and research institutes from universities across the country introduced some of their foundations and views on 3G technology research, including the Institute of Telecommunications Science and Technology of the Ministry of Posts and Telecommunications, which proposed TD-SCDMA technology, and later Datang Telecom. An expert at the Xiangshan meeting later recalled: "There were 20 or 30 people attending the meeting, and the argument was very strong, and 90% of them were skeptical.

It is reasonable for people to be suspicious, international standards have always been the world of foreigners, and the cost of engaging in mobile communication standards is very high and very difficult, and our country has no precedent for this, can we afford to play this game? In the midst of the controversy, Song Zhiyuan, then director of the Science and Technology Committee of the Ministry of Posts and Telecommunications, made a decision: "China's development of mobile communications cannot always rely on foreign technology, there must be a first time."

The first time may not be successful, but it will leave valuable lessons behind. I support them in bringing TD-SCDMA to the international level. If it really fails, we also see it as a victory, an attempt by the Chinese to dare to innovate, and also contribute to the country.

So far, the "Xiangshan Conference" has made the final decision for TD-SCDMA.