Radio Regulations

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

1.13

WRC-27 · Agenda item 1.13

to consider studies on possible new allocations to the mobile-satellite service for direct connectivity between space stations and International Mobile Telecommunications (IMT) user equipment to complement terrestrial IMT network coverage, in accordance with Resolution 253 (WRC-23)

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.

1427–1432 MHz 1645.5–1646.5 MHz 1880–1920 MHz

Also studied under: AI 1.12

1518–1544 MHz 1545–1559 MHz 1610–1645.5 MHz 1646.5–1660 MHz 1670–1675 MHz

Also studied under: AI 1.11

2010–2025 MHz

Also studied under: AI 1.12 AI 1.14

2120–2160 MHz 2160–2170 MHz

Also studied under: AI 1.14

2483.5–2500 MHz

Also studied under: AI 1.11 AI 1.15

2400–2483.5 MHz 2500–2690 MHz

Also studied under: AI 1.15

At a glance Summary & background Regulatory Studies

At a glance Beta

Governing resolution

Res. 253 (WRC-23)

Responsible group WP 4C

Agenda-item type Technical

What's being studied — points to watch

Sharing with terrestrial IMT

The user device is a normal IMT handset, so candidate spectrum sits in or beside mobile bands; protecting terrestrial networks is the core condition.

Cross-border interference

Satellite beams spill across borders, so a direct-to-device downlink must not raise interference into neighbouring countries' mobile networks.

Complement, not replace

The aim is filling coverage gaps; Res. 253 requires that MSS stations neither cause harmful interference to, nor claim protection from, stations of the mobile service.

Which bands

Res. 253 bounds the studies to 694/698 MHz–2.7 GHz, concentrating on mobile-primary bands used for or identified for IMT (Rec. ITU-R M.1036 arrangements); the choice within that range is the central task.

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.