In order to promote the development of China's mobile communication industry and scientific and technological innovation and promote the research and development of the sixth generation mobile communication (6g) technology, the launching meeting of 6G technology research and development was held in Beijing on November 3. Vice Minister Wang Xi of the Ministry of science and technology attended the meeting and delivered a speech.
The meeting announced the establishment of a national 6G technology R & D promotion working group and an overall expert group, of which the promotion working group is composed of relevant government departments, whose responsibility is to promote the implementation of 6G technology R & D; The overall expert group is composed of 37 experts from universities, scientific research institutes and enterprises. It is mainly responsible for proposing 6G technology research layout suggestions and technical demonstration, and providing consultation and suggestions for major decisions. At the meeting, the representative of the overall expert group introduced the research and development trend of 6G technology and future development ideas and suggestions; Representatives of TD industry alliance and future mobile communication forum respectively introduced the development of preliminary work, future 6G imagination and suggestions on the next work plan. The establishment of 6G technology R & D promotion working group and overall expert group marks the official launch of 6G technology R & D in China.
In his concluding speech, Vice Minister Wang Xi pointed out that at present, the global 6G technology research is still in the initial stage of exploration, the technical route is not clear, and there is no unified definition of key indicators and application scenarios. In the critical period of national development, we should attach great importance to, make overall layout, promote efficiently, open and innovate. Next, the Ministry of science and technology, together with relevant departments, will organize an overall expert group to systematically formulate 6G technology R & D plan, carry out 6G technology pre research and explore possible technical directions.
Eight key technologies of 6g
Guotai Junan communication team also listed eight key technologies of 6G in the research report.
1. Machine learning and AI enhancement
The complexity of the network and the 'sharp increase' in the number of connected devices will lead the network to learn, optimize and evolve from experience, and flexibly provide all kinds of new services.
In the 6G era, people and machines will be interconnected and coexist harmoniously. The new future business type may be the intelligent interconnection between agents. In addition to traditional data such as media data, sensing data and control data, AI driven 'smart transmission' will be a new data type occupying 6G network. Agents will be able to share and transmit AI information, forming a real era of 'smart interconnection'.
2. Flexible spectrum sharing to improve efficiency
The traditional dedicated spectrum allocation method makes the spectrum resource allocation full but the utilization rate low, resulting in the contradiction of high spectrum demand but serious shortage of spectrum resources. Itu-rwp5d frequency demand report points out that the global and China's spectrum resource gap will be more than gigahertz in 2020.
Source: Guotai Junan Research Report
Scenario based, per second level dynamic frequency allocation will make more efficient use of the valuable radio spectrum in the lower frequency band. The comprehensive application of AI, blockchain and other technologies helps to improve dynamic spectrum allocation and spectrum efficiency.
3. New battery and wireless energy transmission improve performance
The 6G era requires new battery technologies such as solid-state battery and graphene battery, which have the characteristics of higher energy, lower cost, longer endurance mileage and easier to carry.
Wireless energy transmission may be a feasible method to prolong the service life of battery and avoid frequent charging under certain conditions.
4. Free space optical communication needs to be broken through
Optical free space communication will make the indoor and outdoor wireless communication scene in the 6G era have high data rate, so it is necessary to release the low-frequency radio spectrum of visible light for large-scale use.
5. Terahertz (THz) communication and sub terahertz (sub THz)
The availability of continuous large bandwidth exceeding 100GHz (d-band, 110ghz-170ghz band, etc.) will achieve a short-range high data rate transmission system in the 6G era. Therefore, it is necessary to release THz low-frequency radio spectrum for wide-range use.
Terahertz communication is an interdisciplinary and interdisciplinary composite technology field. It not only needs the development and breakthrough of communication technology, but also needs the support of high-performance devices, especially the preparation of high-power Gan terahertz diode, high-power terahertz solid-state electronic amplifier, high-efficiency terahertz frequency multiplier mixer, high-speed and efficient terahertz modulator High sensitivity terahertz coherent receiver, terahertz high-speed baseband, etc.
6. Extensive use of multi antenna systems
When the spectrum of THz, sub THz and visible light is added to the mobile communication system in the 6G era, operators will need to use multiple antenna systems with multi ray propagation to obtain greater throughput and be used for accurate positioning and wireless energy transmission. In the 6G era, the miniaturization and integration of large-scale array antennas based on metamaterials will be more important.
7. Access scheme for 'large scale wireless network'
It is expected that in the 6G era, there will be more than 10 wireless terminal devices per square meter, so new access mechanisms are needed to process a large number of non orthogonal user data in an efficient and scalable manner.
Nonorthogonal multiple access technology (noma) will flourish in the 6G era. Polarization coding is introduced into the nonorthogonal multiple access system to optimize the channel plan decomposition scheme from the perspective of generalized polarization.
8. Continuous breakthroughs in network security
In the 6G era, non personal devices may be used for personal communication, which will bring many new challenges to biological authentication and privacy. Therefore, the 6G era will need to adopt a new wireless security scheme to enable the relevant communication systems to deal with the attacks launched by quantum computers.