WRC 2027 Agenda Item Details

Agenda Item: Agenda Item 1.7
Resolution(s): Resolution 256 (WRC-23)
Description of work:

This agenda item is to consider studies on sharing and compatibility and develop technical conditions for use of IMT in the frequency bands 4.4 - 4.8 GHz, 7.125 - 8.4 GHz (or parts of) and 14.8 - 15.35 GHz taking into account existing primary services operating in those bands or adjacent frequency bands.

The ITU-R is invited to study:

1. the technical, operational and regulatory issues pertaining to the possible use of the terrestrial component of IMT in these bands taking into account:

  • the evolving needs to meet emerging demand for IMT
  • technical and operational characteristics of terrestrial IMT that would operate in these bands including the evolution of IMT through advances in technology and spectrally efficient techniques
  • deployment scenarios envisaged for IMT systems and related requirements of balanced coverage and capacity
  • the needs of developing countries
  • the time-frame in which spectrum would be needed

2. sharing and compatibility studies with a view to ensuring the protection of services for which the band is allocated on primary basis including protection of stations operating in international waters or airspace which cannot be registered in the MIFR without imposing additional regulatory or technical constraints on these services and also on services in adjacent bands

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


Yet another WRC cycle with an IMT agenda item! There was some discussion about whether it would be useful to have an agenda item for sharing between IMT and Wi-Fi in the upper 6 GHz band, but in the end this was left to national administrations and regional organisations (apart from Resolution 220 addressing sharing between IMT and the FS or FSS).

Lead Working Party(s): WP 5D
Involved Working Parties: WP 1B, WP 3K, WP 3M, WP 4A, WP 4C, WP 5A, WP 5B, WP 5C, WP 7C, WP 7D
How Visualyse products can help:

Visualyse Professional can model IMT systems in depth including the gain pattern in Recommendation ITU-R M.2101 (plus extensions and adjacent band patterns), deployment models for the BS and UE including both uniform and non-uniform deployment, TDD mode, propagation models for the frequency bands involved for both wanted and interfering paths, Monte Carlo modelling methods, power control using the alpha parameter.

It can also model those systems that might have to share with IMT systems in these bands or operate in adjacent bands including fixed service, fixed satellite service, aeronautical mobile, aeronautical radionavigation, radio astronomy, MSS, meteorological-satellite, space research and EESS

Visualyse Professional can model co-frequency and non-co-frequency scenarios involving terrestrial or satellite services and import parameters from ITU databases including terrestrial IFIC and SRS

How Transfinite consultants can help:

We can undertake studies including analysis of sharing between IMT systems and the other services that could be co-frequency or in adjacent frequency bands 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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