Introduction:

ITU-R Report R M.2376 contains studies of frequency ranges (6-100 GHz) for International Mobile Telecommunications (IMT) technologies. It is envisioned that future IMT systems will need to support very high throughput data links to cope with the growth of the data traffic, new extremely bandwidth demanding use cases, as well as new capabilities of integrated sensing and communication (ISAC). There has been academic and industry research and development ongoing related to suitability of mobile broadband systems in frequency bands above 92 GHz to enable services requiring tera-bit per second speeds. This has prompted researchers to consider the technical feasibility of higher frequency bands in IMT.

Overview:

This ITU-R preliminary draft new report in progress provides information on the technical feasibility of IMT in bands between 92 GHz and 400 GHz. This Report complements the studies carried in Report ITU-R M.2376. This technical feasibility Report includes information on propagation mechanisms and channel models, as well as newly developed technology enablers such as active and passive components, antenna techniques, deployment architectures, and the results of simulations and performance tests. Aspects of coexistence with incumbent radiocommunications services above 92 GHz are outside the scope of this document, and this report does not presuppose the inclusion of any item on a future World Radio Conference (WRC) agenda nor the decisions of a future WRC.

ITU-R WP5D emphasizes that the further development of the draft new Report ITU-R M.[IMT.ABOVE 100GHz] does not contain propagation prediction methods. It contains only results contributed by industry and academia of propagation measurements and simulation campaigns.

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From:  Experiments bring hope for 6G above 100 GHz:

Channel models for 4G and 5G cannot simply be extended above 100 GHz; engineers must verify and fine-tune knowledge to correctly reflect the impact of the environment for various use cases. We must, for example, understand outdoor scenarios and indoor industrial scenarios where human bodies, vehicles, and environmental conditions such as rain propagation strongly influence signal propagation.

5G pioneered the use of millimeter wave frequencies with bandwidths up to 400 MHz per component carrier to enable transmission rates necessary for demanding real-time applications such as wireless factory automation. 6G technology is aiming at significantly higher transmission rates and lower latencies. Large contiguous frequency ranges for ultra-high data rates with bandwidths of several GHz are only available above 100 GHz.

With sonar, the transmitter and receiver are in the same place. As for channel sounding of electromagnetic waves, the transmitter and receiver are spatially separated. In time domain channel sounding, a modulated pulse signal with excellent autocorrelation properties, such as a Frank-Zadoff-Chu (FZC) sequence [1], serves as a “ping” whose channel impulse response (CIR) is recorded. This propagation-time measurement is very similar to the time-delay measurements performed in a GPS receiver in reference to the GPS satellites (and subsequently inferring the position information), where each satellite transmits its specific correlation sequence. The CIR includes both the direct propagation components (line of sight, LOS) and all reflection and scattering components (non-line-of-sight, NLOS) from objects in the environment (Figure 1). We can derive channel-model parameters and their values from the results.

Figure 1. Operating principle of time domain channel sounding: The channel impulse response (CIR) is measured by emitting an electromagnetic “ping” at the frequency of interest and capturing all returning signal components.

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References:

https://www.itu.int/md/R19-WP5D-C-0679/en  (RESTRICTED TO ITU TIES USERS)

https://www.itu.int/md/R1-WP5D-C-1654/en (RESTRICTED TO ITU TIES USERS)

ITU-R WP5D: Studies on technical feasibility of IMT in bands above 100 GHz

Experiments bring hope for 6G above 100 GHz