WRC 2027 Agenda Item Details

This agenda item is to consider possible allocations to the MSS and possible regulatory actions in the frequency bands 1 427 - 1 432 MHz (space-to-Earth), 1 645.5 - 1 646.5 MHz (space-to-Earth)(Earth-to-space), 1 880 - 1 920 MHz (space-to-Earth)(Earth-to-space) and 2 010 - 2 025 MHz (space-to-Earth)(Earth-to-space) required for future development of low-date-rate non-GSO MSS.

WRC-23 is invited to:

1. study the spectrum requirements, technical and operational characteristics and conditions for non-GSO low-data-rate MSS systems including mitigation techniques that would allow coexistence of these systems in the same frequency band
2. study sharing and compatibility between the non-GSO low-data-rate MSS systems and the existing primary services operating in these and adjacent bands in order to ensure protection of existing services.

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

There was some discussion at WRC-23 about what was meant by "low-data-rate" in the context of non-geostationary MSS, but it was generally accepted that relates to applications like the internet of things (IoT). Note how the allocations are often adjacent to existing MSS allocations and how some bands are considering both space-to-Earth and Earth-to-space operation that would allow time-division duplex (TDD) operation.

Visualyse Professional can IoT style MSS systems, both GSO and non-GSO, and services they might have to share with, including space operations, terrestrial fixed and mobile and adjacent band services including the EESS(passive), radio astronomy and space research (passive). 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 and can model frequency division duplex (FDD) or TDD operation.

We can undertake studies including analysis of sharing between the different services covered by this agenda item including MSS (existing or low-data-rate), space operations, terrestrial fixed and mobile, EESS(passive), radio astronomy and space research (passive). 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.