WRC 2023 Agenda Item Details

Agenda Item: Agenda Item 1.17
Resolution(s): Resolution 773 (COM6/14) (WRC-19)
Description of work:

This agenda item is to determine and carry out, on the basis of the ITU-R Studies in accordance with Resolution COM6/14 (WRC-19), the appropriate regulatory actions for the provision of inter-satellite links in specific frequency bands, or portions thereof, by adding an inter-satellite service allocation where appropriate. The ITU-R is invited to:

  1. develop the technical and operational characteristics of different types of space stations that plan satellite-to-satellite transmissions in the frequency bands 11.7-12.7 GHz, 18.1-18.6 GHz, 18.8-20.2 GHz and 27.5 - 30 GHz
  2. study the technical and operational characteristics, including spectrum requirements, offaxis EIRP values and out-of-band emission limits, for transmissions between space stations in the frequency bands 11.7-12.7 GHz, 18.1-18.6 GHz, 18.8-20.2 GHz and 27.5 - 30 GHz
  3. study sharing and compatibility between satellite-to-satellite links, intended to operate between space stations in the frequency bands 11.7-12.7 GHz, 18.1-18.6 GHz, 18.8-20.2 GHz and 27.5 - 30 GHz, and current and planned stations of the FSS and other existing services allocated in the same frequency bands and adjacent bands including passive services, with a view to ensure protection of primary services
  4. to develop, for different types of space stations, the technical and regulatory provisions for satellite-to-satellite operations in the frequency bands 11.7-12.7 GHz, 18.1-18.6 GHz, 18.8-20.2 GHz and 27.5 - 30 GHz or portions thereof, including new ISS allocations, as appropriate, taking into account the results of studies above

WRC-23 is invited to review the results of these studies and take necessary actions, as appropriate
Comments: One motivation for this work is the growth in the number of EESS satellites and the data rates they generate. With new services such as video and mini-constellations of EESS satellites, there is an increasing need to provide continuous high-data rates communication from EESS satellites in LEO back to ground stations. In addition, these services could be used to provide global TT&C coverage without requiring large numbers of Earth stations.
Lead Working Party(s): WP 4A
Involved Working Parties: WP 3M, WP 4B, WP 4C, WP 5A, WP 5B, WP 5C, WP 7B
How Visualyse products can help: Visualyse Professional can model the inter-satellite links between LEO or MEO and GSO in the frequency range identified. It can also spectrum sharing with other service in these and adjacent bands including GSO FSS, non-GSO constellations, 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 inter-satellite links between LEO or MEO to GSO and other GSO services, non-GSO constellations or 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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