WRC 2023 Agenda Item Details

Agenda Item: Agenda Item 1.15
Resolution(s): Resolution 172 (COM6/12) (WRC-19)
Description of work:

This agenda item is to harmonize the use of the frequency band 12.75 - 13.25 GHz (Earth-to-space) by earth stations on aircraft and vessels communicating with geostationary space stations in the fixed satellite service globally. The ITU-R is invited to:

  1. study the technical and operational characteristics and user requirements of earth station on aircraft and vessels that communicate or plan to communicate with GSO space stations in the FSS in the frequency band 12.75 - 13.25 GHz (Earth-to-space) under the envelope of Appendix 30B Article 65 recorded in the List of MIFR with favourable finding
  2. study the sharing and compatibility issues between earth stations on aircraft and vessels communicating with GSO space stations in the FSS and current and planned stations of existing services as wells as services in bands adjacent to those to ensure protection of and not impose undue constraints on, those services and their future development, taking into account the provisions of Appendix 30B
  3. to study the responsibility of the entities involved in the operation of the earth stations on aircraft and resolutions
  4. develop the criteria to ensure that earth stations on aircraft and vessels as a new application of the FSS in this frequency band shall not claim more protection or cause more interference than filed earth stations of Appendix 30B
  5. to develop the technical conditions and regulatory provisions for the harmonized operation of earth stations on aircraft and vessels communicating with GSO space stations in the FSS operating in the frequency band 12.75 - 13.25 GHz (Earth-to-space), considering the result of studies, and in particular without affecting the Appendix 30B Plan
  6. to ensure that the operation of earth stations on aircraft and vessels in the frequency band 12.75 - 13.25 GHz under Appendix 30B shall not adversely affect the interference criteria including the cumulative effect of multiple earth stations on aircraft and vessels
  7. to ensure that the use of the frequency band 12.75 - 13.25 GHz (Earth-to-space) by earth stations on aircraft and vessels shall not limit the access of other administrations to their national resources in Appendix 30B
  8. ensure that use of earth stations on aircraft and vessels would not result in any additional status than the GSO network with which these stations communicate

WRC-23 is invited to review the results of these studies and take necessary actions, as appropriate
Comments: This builds on a series of agenda items at previous WRCs considering the question of Earth station in motions (ESIMs) which were previously described as Earth station on moving platforms (ESOMPs). Its worth noting that the use of the frequency band 12.75 - 13.25 GHz goes back to WARC Orb-88!
Lead Working Party(s): WP 4A
Involved Working Parties: WP 3M, WP 5A, WP 5B, WP 5C
How Visualyse products can help: Visualyse Professional can model the ESIMs operating both on aircraft and vessels and other services in the frequency range 12.75 - 13.25 GHz (and adjacent bands) such as the GSO FSS (within the plans), fixed, mobile, space research, aeronautical radionavigation, EESS (active) 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 ESIMs, FSS & BSS GSO, fixed, mobile, space research, aeronautical radionavigation 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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