radio

World Radiocommunication Conference clarifies for the first time available frequencies for fixed and mobile radio services in the terahertz band above 275 GHz

来源: 发布时间:2019-11-27 12:56 我要评论 Author: From: Date: 2019-11-27 12:56 I want to comment
Terahertz has ushered in significant development opportunities. After many coordinations with 6 regional telecommunication organizations around the world, and full discussions by representatives from China, the United States, Germany, France, and Canada, the World Radiocommunication Conference 2019 (WRC-19) finally approved 275 GHz-296 GHz, 306GHz-313 A total of 137 GHz bandwidth resources in the GHz, 318 GHz-333 GHz and 356 GHz-450 GHz bands can be used for fixed and land mobile service applications without restrictions. This is the first time that ITU has defined the available spectrum resources for terrestrial active radio service applications in the terahertz band above 275GHz, and raised the upper limit of available spectrum resources for active services to 450GHz, which will provide basic resource guarantee for the development and application of the global terahertz communication industry .

In recent years, terahertz communication has become a research hotspot in various countries. Terahertz radio waves have the characteristics of both traditional microwave and light waves, and have shown many excellent performances in space science, passive remote sensing, security detection, biomedical and astronomical observations. At the same time, because terahertz occupies an ultra-wide spectrum in the 300GHz-3THz frequency band, and terahertz communication has the advantages of large transmission capacity, high security, and good penetration, so it has great development potential and application prospects. THz science Has gradually become an important direction for the development of a new generation of wireless communication industry.

Previously, in the ITU Radio Regulations, there was no radio service allocation in the frequency band above 275 GHz, and the only footnote listed could be used for the Earth exploration-satellite service (passive), space operation service (passive), and radio. Radio services such as astronomy services; at the same time, footnotes also indicate that active services can also use the 275GHz-1000GHz band, but national authorities should take all practical measures to protect these passive services from harmful interference when using active services. Therefore, how to properly solve the interference coordination problem between passive services and active services, and ensure compatibility and sharing have become the key to this issue.

Terahertz remote sensing technology has played an important role in the application of passive radio services. Several bands in the 275GHz-450GHz frequency band have been identified for satellite passive service applications such as scientific research, environmental remote sensing and monitoring. There are currently nine existing or planned satellite Earth exploration service sensors for performing global measurements. These systems use highly sensitive equipment to detect the natural electromagnetic energy absorbed and emitted by the Earth's atmosphere, land and ocean components. These scientific measurement data obtained through satellite systems can be used to support the analysis of atmospheric parameters (temperature, humidity, composition) for weather forecasting, weather trend prediction, pollutant alarms, etc., and also provide other important data parameters of the earth's surface (such as snow and ice coverage, Soil moisture content). China is also considering the development of more advanced meteorological satellite observation systems in the terahertz band to achieve more accurate and diverse weather data forecasting.

The terahertz frequency band is also an extremely important observation frequency band in the field of radio astronomy. There are already 13 different radio astronomy sites around the world using the frequency band above 275GHz for astronomical observation. These radio astronomy systems in operation include single-aperture telescopes, interferometers, and balloon platforms, etc., using the most advanced and sensitive cryogenic refrigeration radio receiving systems currently available. Most radio astronomy observatories are located at high altitudes. The design and construction of the facility takes a lot of time, expertise and financial resources, and is a scientific research resource shared globally. Therefore, these frequency resources are very important for radio astronomy operation.

"Protection of these satellite earth exploration equipment and radio astronomy stations is the focus of discussion in this WRC-19 agenda item 1.15, and ensuring the effective use of the terahertz frequency band by our future meteorological satellite systems and radio astronomy stations is the first consideration of our topic research. .We have to consider that terahertz frequency planning and future industry development will not cause interference to these passive service systems, because these frequency bands are quite unique and scarce for passive services, and are important for human life and scientific research. " The leader of the Chinese delegation WRC-19 1.15, Wang Xiaodong, a senior engineer at the National Radio Monitoring Center, said at the same time, "At the same time, terahertz communication technology is a possible important direction for the future development of wireless communication and even 6G communication technology. Gigahertz and even tens of gigahertz bandwidth will become possible, so striving for more available continuous spectrum resources is also in line with the needs of the future development of terahertz wireless communications. In other words, we need to balance well when discussing the outcome of the issue Protection of existing business and development of new business begging."

During WRC-19, there was a big divergence in the third frequency band, which was the focus of discussion on the topic of 1.15, that is, the parties who specifically chose the 320 GHz-330 GHz or 318 GHz-333 GHz frequency bands held different positions, and the meeting was unable to reach consensus. My delegation has always actively participated in the research and discussion of topics. In addition to expressing opinions at the meeting, it also actively communicated with representatives of the European Union, the United States and Canada. At the same time, during the meeting, Wang Xiaodong led a team to check the frequency usage requirements with relevant domestic departments again, and carried out technical analysis overnight to eliminate possible interference. According to Wang Xiaodong, there are two difficulties in the analysis of electromagnetic compatibility in the terahertz band. The first is that the propagation model in the terahertz band ground-to-air interference scenario is uncertain, because atmospheric absorption and attenuation are very different between inland and coastal areas. It will have a certain impact on the simulation analysis results. Second, there are uncertainties in the future ground service application scenarios and aggregate interference problems. "Therefore, our China research is carried out with more realistic system parameters as assumptions, which can ensure that the research results well protect our own future passive systems." Wang Xiaodong said. In the end, after intense work, on the basis of confirming the protection of various passive services, the 318GHz-333GHz frequency band solution that China proposed to support was finally unanimously approved by the plenary.

With the successful completion of the WRC-19 1.15 conference, the frequency bands for terrestrial service radio applications in the terahertz band 275GHz-450GHz band have also been successfully established. This result will provide clear spectrum policy guidance to the terahertz industry, greatly promote the rapid development of terahertz technology and applications, and lay a foundation for it to play a more important role in future radio communications.


Editor-in-chief: Qi Xu
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