Radio Regulations

Source: the Radio Regulations published by the International Telecommunication Union (ITU).

1.7

WRC-27 · 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 and 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 256 (WRC-23)

Current WP 5D Res. 256 (WRC-23) › 4400–4800 MHz 7125–7250 MHz 7125–8400 MHz 7750–8400 MHz 14.8–15.35 GHz

Shared frequency bands

Bands this agenda item addresses jointly with other WRC-27 items (CPM Report Table 1). Click a band to open its spectrum page.

7190–7235 MHz

Also studied under: AI 1.15

At a glance Summary & background Regulatory Studies

At a glance Beta

Frequency band

4400–4800 MHz 7125–7250 MHz 7125–8400 MHz 7750–8400 MHz 14.8–15.35 GHz

Governing resolution

Res. 256 (WRC-23)

Responsible group WP 5D

Agenda-item type Technical

The band and its sensitive neighbours

FIXED

MOBILE

Fixed satellite

SPACE RESEARCH

Earth exploration-satellite

MOBILE-SATELLITE

Meteorological satellite

Blocks group a service with its direction and mode variants; the table names each allocation as the Radio Regulations name it.

Current framework

Services in this band

MOBILE	Primary IMT candidate
FIXED	Primary
Fixed satellite	Primary 4500–4800 (App. 30B) / 7125–8400 MHz
MOBILE-SATELLITE	Primary 7125–8400 MHz
Earth exploration-satellite	Primary 7125–8400 MHz
Meteorological satellite	Primary 7 GHz downlinks
SPACE RESEARCH	Primary 7125–8400 MHz

What's being studied — points to watch

Satellite links in 7–8 GHz

IMT base stations must not raise interference into fixed- and mobile-satellite reception across 7125–8400 MHz — including stations in international waters or airspace that cannot be registered in the MIFR (Res. 256).

Weather-satellite downlinks

Meteorological-satellite downlinks near 7.45 and 7.75 GHz feed forecasting; their protection is a central requirement of the studies.

Space research & Earth observation

EESS and SRS reception in the band are low-signal and sensitive to aggregate IMT emissions.

"No new constraints" bar

Resolution 256 asks that identifying IMT add no regulatory or technical constraints on incumbents — a high threshold.

Three very different bands

Each band has its own incumbents and regional scope: identification is considered for 4400–4800 MHz in Regions 1 and 3, 7125–8400 MHz in Regions 2 and 3 (Region 1 only 7125–7250 and 7750–8400 MHz), and 14.8–15.35 GHz globally (Res. 256).

Preparation timeline

Dec 2023 WRC-23 agenda adopted

Dec 2023 WRC-23 agenda adopted
Dec 2023 CPM 27-1 studies allocated

Dec 2023 CPM 27-1 studies allocated
ITU-R studies 2026

ITU-R studies 2026
ITU-R studies 2027

ITU-R studies 2027
5–15 Apr 2027 CPM 27-2 final report

5–15 Apr 2027 CPM 27-2 final report
RTO Prep meetings 2027

RTO Prep meetings 2027
11–15 Oct 2027 RA-27

11–15 Oct 2027 RA-27
18 Oct–12 Nov 2027 WRC-27

18 Oct–12 Nov 2027 WRC-27

Dec 2023 WRC-23 agenda adopted
Dec 2023 CPM 27-1 studies allocated
ITU-R studies 2026
ITU-R studies 2027
5–15 Apr 2027 CPM 27-2 final report
RTO Prep meetings 2027
11–15 Oct 2027 RA-27
18 Oct–12 Nov 2027 WRC-27

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Source: ITU Radio Regulations, editions of 2008, 2012, 2016, 2020 and 2024. The English, French and Spanish texts are each taken from the official edition in that language, not translated from one another. Sources and citation.