WRC 2023 Agenda Item Details

Agenda Item: Agenda Item 1.4
Resolution(s): Resolution 247 (COM6/4) (WRC-19)
Description of work:

This agenda item considers use of high altitude platform stations as IMT base stations (HIBS) in the mobile service in some bands below 2.7 GHz. In particular, the bands:

  1. 694 - 960 MHz
  2. 1 710 - 1 885 MHz (1 710 - 1 815 MHz for uplink only in Region 3)
  3. 2 500 - 2 690 MHz (2 500 - 2 535 MHz for uplink only in Region 3 except 2 655 - 2 690 MHz in Region 3)

The ITU-R is invited to study:

  1. spectrum needs for HIBS
  2. sharing and compatibility studies (including with services in adjacent bands where appropriate) in order to protect services with an existing primary allocation without imposing any additional technical or regulatory constraints in their deployment
  3. modifications to existing footnote and resolutions in order to facilitate use of HIBS with the latest radio interface technologies of IMT
  4. the definition of HIBS and possible modification to the RR as appropriate
Comments: One of the hot topics at WRC-19 was the agenda item related to HAPS, namely the old 1.14. This resulted in a number of new allocations, such as in 21.4 - 22 GHz, 24.25 - 25.25 GHz, 25.25 - 27.5 GHz, 31 - 31.3 GHz, 38 - 39.5 GHz and other bands via country footnotes. However these were for fixed services not mobile, hence the new agenda item. The Resolution also recognizes that some GSO MSS satellite networks in Region 3 have reported harmful interference affecting their uplinks in the frequency band 2 655 - 2 690 MHz from terrestrial IMT stations.
Lead Working Party(s): WP 5D
Involved Working Parties: WP 3K, WP 3M, WP 4A, WP 4C, WP 5A, WP 5B, WP 5C, WP 6A, WP 7B, WP 7C, WP 7D
How Visualyse products can help: Visualyse Professional can model sharing between HAPS/HIBS services and other services such as mobile, broadcasting, fixed or other services. This analysis can be static, area, dynamic or Monte Carlo including adjacent band studies. A range of propagation models could be used including P.528, which is designed for ground-air and air-air applications plus also P.452, P.1546, P.1812 or P.2001. Visualyse Professional can also model the beam-forming antenna gain pattern in Recommendation ITU-R M.2101.
How Transfinite consultants can help: We can undertake studies including analysis of sharing between the services covered by this agenda item, and 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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