WRC 2023 Agenda Item Details

Agenda Item: Agenda Item 9.1.2
Resolution(s): Resolution 774 (COM6/17) (WRC-19)
Description of work:

This agenda item is to review the amateur service and the amateur-satellite service allocations in the frequency band 1 240 - 1 300 MHz to determine if additional measures are required to ensure protection of the radionavigation-satellite (space-Earth) service operating in the same band.

The ITU-R is invited to:

  1. perform the detailed review of the different systems and applications used in the amateur service and amateur-satellite service allocations within the frequency band 1 240 - 1300 MHz
  2. taking into account the results of the above review, to study possible technical and operational measures to ensure the protection of RNSS (space-to-Earth) receivers from the amateur and amateur-satellite service within the frequency band 1 240 - 1 300 MHz, without considering the removal of these allocations

The Director of the BR is instructed to report on the results of the ITU-R studies to WRC-23

Comments: RNSS systems aim to provide ubiquitous continuous service and received signal strengths at the surface of the Earth are very low. Hence it is important to ensure that there are regulatory provisions in place to protect against harmful interference. Given the global nature of RNSS and the potential for cross-border interference, this issue is a subject for review at WRC rather than just at a national regulator level. Also, solving interferences cases can take days and will be a burden on administrations that will need to trace, identify and resolve each interference case.
Lead Working Party(s): WP 5A
Involved Working Parties: WP 3M, WP 4C
How Visualyse products can help: Visualyse Professional can model RNSS and other services such as the amateur and amateur satellite service. 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. Recently Visualyse Professional was used to model a similar sharing scenario, namely the potential for harmful interference from PMSE in 960 - 1164 MHz on RNSS receivers above 1164 MHz
How Transfinite consultants can help: We can undertake studies including analysis of sharing between the different services covered by this agenda item including RNSS. amateur and amateur-satellite. 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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