WRC 2023 Agenda Item Details

Agenda Item: Agenda Item 1.16
Resolution(s): Resolution 173 (COM6/13) (WRC-19)
Description of work:

This agenda item is to study and develop technical, operational and regulatory measures, as appropriate, to facilitate the use of the frequency bands 17.7 - 18.6 GHz, 18.8 - 19.3 GHz, 19.7 - 20.2 GHz (space-to-Earth), 27.5 - 29.1 GHz and 29.5 - 30 GHz by non-GSO FSS earth stations in motion, while ensuring due protection of existing services in those frequency bands. The ITU-R is invited to:

  1. study the technical and operational characteristics and user requirements of the different types of earth stations in motion that plan to operate in the frequency bands 17.7 - 18.6 GHz, 18.8 - 19.3 GHz, 19.7 - 20.2 GHz (space-to-Earth), 27.5 - 29.1 GHz and 29.5 - 30 GHz (Earth-to-space) or parts thereof
  2. to study sharing and compatibility between earth stations in motions operating with non-GSO FSS systems and current and planned stations of primary services allocated in the frequency bands 17.7 - 18.6 GHz, 18.8 - 19.3 GHz, 19.7 - 20.2 GHz (space-to-Earth), 27.5 - 29.1 GHz and 29.5 - 30 GHz (Earth-to-space) or parts thereof, to ensure protection of and not impose additional constraints on GSO systems and other services including terrestrial services in those frequency bands and in adjacent bands, including passive services
  3. to develop the technical and regulatory provisions of the operation of aeronautical and maritime earth stations in motion with non-GSO FSS systems, taking into account the results of studies
  4. to ensure that the technical and operational measures and the possible regulatory changes established in accordance with this Resolution shall not affect the relevant provisions related to the protection of GSO networks from non-GSO FSS Systems

WRC-23 is invited to review the results of these studies and take necessary actions, as appropriate
Comments: This builds upon the work of previous conferences that have developed a regulatory framework for ESIMs communicating with GSO satellites in order to study its extension to ESIMs communicating with non-GSO FSS constellations. Note the gap in frequency bands to study at 18.6 - 18.8 GHz which has an EESS (passive) primary allocation protected under 21.16.2 so that the PFD in this band should not exceed -95 dB (W/m2) across the 200 MHz apart from a permitted exceedance by up to 3 dB for no more than 5% of the time
Lead Working Party(s): WP 4A
Involved Working Parties: WP 3M, WP 4C, WP 5A, WP 5B, WP 5C, WP 7B
How Visualyse products can help: Visualyse Professional can model the ESIMs operating both on aircraft and vessels and other services in the frequency range identified communicating with both GSO and non-GSO FSS constellations. It can also spectrum sharing with other service in these and adjacent bands including GSO FSS, fixed, mobile, EESS (passive) etc services. A range of modelling methodologies can be used including static and dynamic including modelling of satellite orbits. Propagation models are available for space to space, space to Earth and terrestrial paths and Visualyse Professional can model both co-frequency and non-co-frequency interference scenarios
How Transfinite consultants can help: We can undertake studies including analysis of sharing between the different services covered by this agenda item including GSO and non-GSO ESIMs, fixed, mobile and EESS services. We can help identify suitable system characteristics and sharing criteria, and provide contributions and representation at ITU-R Working Parties. Using our in house Visualyse Professional we can quickly model a very wide range of systems, services and scenarios.
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