**WRC 27 Telemetry Watch**

The ICTS strives to keep it members and associates informed on international threats and challenges to RF telemetry spectrum. With the completion of the 2023 World Radiocommunications Conference (WRC 2023, Dubai, UAE 20Nov to 15Dec23) several telemetry spectrum related agenda items were proposed for the 2027 WRC. ICTS members are encouraged to pass-on information they may have on impacts from these agenda items to ICTS@telemetryspectrum.org and we will post that information here on the WRC 27 Telemetry Watch. Our goal is to keep the telemetering community aware of these threats so they keep their own national administrations informed of national impacts. As a result, we hope their national ITU representatives can make informed decisions and presentations in ITU working party and regional discussions.

Agenda Item 1.11

WRC 27 Agenda Item 1.11 will address the growing need for space-space staellite links. “… to consider the technical and operational issues, and regulatory provisions, for space-to- space links among non-geostationary and geostationary satellites in the frequency bands 1 518-1 544 MHz, 1 545-1 559 MHz, 1 610-1 645.5 MHz, 1 646.5-1 660 MHz, 1 670-1 675MHz and 2 483.5-2 500 MHz allocated to the mobile-satellite service, in accordance with Resolution 249. (Rev.WRC-23).

Current Telemetry use/potential impact:

The associated resolution to this agenda item (Res 249) notes that in Region 2 the frequency band 1 435-1 525 MHz is used by the aeronautical mobile service for telemetry. It seeks studies of the technical and operational characteristics of different types of non- geosynchronous-orbit (non-GSO) space stations that operate space-to-space links with non-GSO systems or GSO networks for space-to-Earth direction in the frequency bands 1 518-1 525 MHz, among others.

This could affect AMT operators in the United States and other administrations. This would also include the space-to-Earth direction in the frequency band 1 518-1 544 MHz.

Current Status: This has been assigned to ITU Working Party 4C which meets in Oct.

Agenda Item 1.13

…to consider studies on possible new allocations to the mobile-satellite service for direct connectivity between space stations and International Mobile Telecommunications (IMT) user equipment to complement terrestrial IMT network coverage, in accordance with Resolution COM6/9. (WRC-23)

Current Telemetry use/potential impact:

The agenda item and accompanying Resolution COM6/9 (WRC-23) provide that the studies will deal with the frequency range between 694/698 MHz and 2.7 GHz, which can include several AMT bands.

Agenda Item 1.7

… to consider studies on sharing and compatibility and develop technical conditions for the use of International Mobile Telecommunications (IMT) in the frequency bands 4 400-4 800 MHz, 7 125-8 400 MHz (or parts thereof), and 14.8-15.35 GHz taking into account existing primary services operating in these, and adjacent, frequency bands, in accordance with Resolution COM 6/26 (WRC- 23)

Current Telemetry use/potential impact:

The associated resolution on IMT could affect the 4 400- 4 940 MHz band used for AMT. The resolution discusses the necessary studies for the use of International Mobile Telecommunications (IMT) in several bands, including 4 400-4 800 MHz (Region 1 and 3 only), to implement IMT. The resolution references relevant protective information relating to previous sharing studies including ITU-R M.2116.

Proposed Agendas Item for WRC 31

RNSS Spectrum. WRC-23 adopted a preliminary agenda item for WRC-31 on RNSS spectrum

…to consider possible allocations to the radionavigation-satellite service (space-to- Earth) in the frequency bands [5 030-5 150 MHz and 5 150-5 250 MHz] or parts thereof, in accordance with Resolution COM6/19 (WRC- 23)

The accompanying resolution (COM 6/19) asks for studies on possible new allocations to the radionavigation-satellite service (space-to- Earth) in the frequency bands [5 030-5 150 MHz and 5 150-5 250 MHz] or parts thereof.

Current Telemetry use/potential impact:

Parts of these bands are currently used by AMT (5 091-5 150 MHz globally and 5150-5250 in Region 1 (and others). This resolution, in support of the ESA’s R&D activities on the European Global Navigation Satellite System (EGNSS) and Positioning, Navigation and Timing in Low Earth Orbit (LEO-PNT), asks for new frequency bands and allocations suitable for very wide band PNT signals. Clearly, these new services could be exploited by all other RNSS users, including aeronautical transportation systems. It is felt that these potential new signals cannot be supported in the existing allocations.

ITU-R Studies on sharing and compatibility between RNSS and the incumbent services may be considered at WRC-27 with the result depending on confirmation of the preliminary agenda item for WRC-31.