WRC 2027 Agenda Item Details

Agenda Item: Agenda Item 1.11
Resolution(s): Resolution 259 (Rev. WRC-23)
Description of work:

This agenda item is to consider the technical and operational issues and regulatory provisions for space-to-space links among GSO and non-GSO satellites in 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 - 1 675 MHz and 2 483.5 - 2 500 MHz allocated to the MSS. The ITU-R is invited to:

  1. study the technical and operational characteristics of different types of non-GSO space stations that operate or plan to operate space-to-space links with GSO networks in the frequency bands 1 626.5 - 1 645.5 MHz and 1 646.5 - 1 660 MHz (Earth-to-space) and 1 525 - 1 544 MHz and 1 545 - 1 559 MHz (space-to-Earth)
  2. study the technical and operational characteristics of different types of non-GSO space stations that operate or plan to operate space-to-space links with non-GSO systems or GSO networks in the frequency bands 1 610 - 1 626.5 MHz and 1 670 - 1 675 MHz (Earth-to-space) and 1 518 - 1 525 MHz, 1 613.8 - 1 626.5 and 2 483.5 - 2 500 MHz (space-to-Earth)
  3. study sharing and compatibility between space-to-space links in the cases described above with current and planned stations of the MSS, other existing primary services allocated in the same frequency bands, other existing primary services allocated in adjacent frequency bands and existing passive services allocated in adjacent frequency bands
  4. develop technical conditions and regulatory provisions for the operation of space-to-space links in these bands including MSS (space-to-space) allocations of the additional of inter-satellite service (ISS)

Space-to-space links should only operate in the same direction as existing MSS allocations.

WRC-27 is invited to consider the results of the above studies and take necessary actions, as appropriate.
Comments:

Note that Nos 5.357A and 5.262A provide priority for accommodating the spectrum requirements of the aeronautical MSS (R) in the frequency bands 1 545 - 1 555 MHz and 1 646.5 - 1 656.5 MHz, and 1 555 - 1 559 MHz and 1 656.5 - 1 660.5 MHz and that 5.353A provides priority for distress, urgency and safety communications of the GMDSS in the frequency bands 1 530 - 1 544 MHz and 1 626.5 - 1 645.5 MHz.

This agenda item is similar to the previous cycle's AI 1.17 that considered space-to-space links in part of Ka band used by the FSS - see the package of measures agreed at WRC-23 in Resolution 679.
Lead Working Party(s): WP 4C
Involved Working Parties: WP 3L, WP 3M, WP 4A, WP 4B, WP 5A, WP 5B, WP 5C, WP 5D, WP 6A, WP 7B, WP 7C, WP 7D
How Visualyse products can help: Visualyse Professional can model both GSO and non-GSO MSS systems including Earth-to-space, space-to-Earth and space-to-space links. It was extensively used for work under WRC-23 AI 1.17 to analyse a similar scenario at Ka band for FSS systems. It includes tracking strategies to analyse both in-the-cone and outside-the-cone concepts and sharing with other services including fixed, mobile, space operations, aeronautical radionavigation, radiodetermination-satellite, metaids, radio astronomy and passive services in adjacent bands.
How Transfinite consultants can help: We can undertake studies including analysis of sharing between the systems involved, including GSO and non-GSO MSS, in the UL, DL and ISL directions plus the other services involved. We can 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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