Director of Radiocommunication
Bureau (BR)
Geneva, 2 Decembre 2024
Our Ref.: 01RB(DIR)O-2024-003926
Contact: Mario Maniewicz, Director, BR Mr Erko Kulu
Telephone: +41 22 730 5800 Head of Frequency Management
Telefax: +41 22 730 5785 Division
E-mail:
[email protected] Consumer Protection and Technical
Regulatory Authority
Endla 10A
10122 TALLINN
Estonia
Emails:
[email protected]
[email protected]
Subject: Submission from the Administration of Estonia regarding harmful interference to systems
in the radionavigation-satellite service
Y/Ref: Your letter reference No. 17-5/2024/1223 dated 6 November 2024
Dear Sir,
I thank you for your above-mentioned letter and wish to inform you that the Radio Regulations Board (RRB),
at its 97th meeting (11 - 19 November 2024), considered under its agenda 6.2, Document RRB24-3/3(Add.4)
submitted by the Radiocommunication Bureau regarding harmful interference to systems in the
radionavigation-satellite service. The Board also noted for information your submission as contained in
Document RRB24-3/DELAYED/9 as well as Document RRB24-3/DELAYED/10, received from the
Administration of Lithuania, which had arrived after the deadline for submission as providing additional
information on the matter.
The Board took the following decisions and instructed the Executive Secretary of the RRB to inform you as
follows:
“The Board carefully considered Addendum 4 to Document RRB24-3/4 and thanked the Bureau for the report
on numerous cases of harmful interference affecting receivers in the radionavigation-satellite service (RNSS).
The Board considered with appreciation the Bureau’s proposed recommendations and decided to endorse
those recommendations with modifications, as per the following:
The attention of the administrations concerned should be drawn to their obligations to:
a) acknowledge receipt of the Bureau’s communications under No. 15.35 of the Radio Regulations;
b) cooperate in the resolution of the case(s) in accordance with, but not limited to, the following
provisions:
i. Article 45 of the ITU Constitution: “All stations, whatever their purpose, must be established
and operated in such a manner as not to cause harmful interference to the radio services or
communications of other Member States.”
International Telecommunication Union • Place des Nations • CH-1211 Geneva 20 • Switzerland
Tel: +41 22 730 5111 • Fax: +41 22 733 7256 • E-mail:
[email protected] • www.itu.int •
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ii. Article 47 of the ITU Constitution: “Member States agree to take the steps required to
prevent the transmission or circulation of false or deceptive distress, urgency, safety or
identification signals, and to collaborate in locating and identifying stations under their
jurisdiction transmitting such signals.”
iii. No. 4.10 of the Radio Regulations: “Member States recognize that the safety aspects of
radionavigation and other safety services require special measures to ensure their freedom
from harmful interference; it is necessary therefore to take this factor into account in the
assignment and use of frequencies.”
iv. No. 15.1 of the Radio Regulations: “All stations are forbidden to carry out unnecessary
transmissions, or the transmission of superfluous signals, or the transmission of false or
misleading signals, or the transmission of signals without identification.”
v. No. 15.28 of the Radio Regulations: “Recognizing that transmissions on distress and safety
frequencies and frequencies used for the safety and regularity of flight (see Article 31 and
Appendix 27) require absolute international protection and that the elimination of harmful
interference to such transmissions is imperative, administrations undertake to act
immediately when their attention is drawn to any such harmful interference.”
vi. No. 15.37 of the Radio Regulations: “An administration receiving a communication to the
effect that one of its stations is causing harmful interference to a safety service shall
promptly investigate the matter and take any necessary remedial action and respond in a
timely manner.”
vii. Resolution 676 (WRC-23) on “Prevention and mitigation of harmful interference to the
radionavigation-satellite service in the frequency bands 1 164 - 1 215 MHz and
1 559 - 1 610 MHz”; in particular, resolves 2 of Resolution 676 (WRC-23) should be
understood in the context of the provisions of Articles 45, 47 and 48 of the ITU Constitution,
and Article 15 of the Radio Regulations.
The Board furthermore indicated that:
• when considering cases of harmful interference to systems in the RNSS, administrations were
encouraged to implement the recommendations given in Circular Letter CR/488: “Prevention of
harmful interference to radionavigation-satellite service receivers in the 1 559 – 1 610 MHz
frequency band”;
• administrations were urged to continue reporting cases of harmful interference affecting the RNSS
to the Bureau, thus enabling the assessment of situations and subsequent actions and progress.”
The RRB further decided as follows:
“The Board further considered Addendum 4 to Document RRB24-3/4, reporting on submissions from other
administrations not covered in agenda item 6.1 regarding harmful interference affecting receivers in the
RNSS, and also noted Documents RRB24-3/DELAYED/9 and RRB24-3/DELAYED/10 for information. The Board
thanked the Bureau for treating the cases of harmful interference, aiding administrations, acting in a diligent
manner and reporting on other cases of harmful interference to receivers in the RNSS received in 2024. In
response:
• The Board noted with grave concern the increasing number of cases of harmful interference
affecting safety services, civil aviation and maritime services, telecommunication networks
requiring precise time synchronization and other radio stations used for humanitarian assistance in
the field.
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• The Board expressed considerable concern at the late acknowledgements of receipt of information
reporting harmful interference present from stations under their jurisdictions; in compliance with
RR No. 15.35, such acknowledgements should be provided by the quickest means available.
• The Board stressed the need to comply with RR No. 4.10 whenever harmful interference degraded
systems of safety services in the RNSS.
• Furthermore, the Board reminded administrations of the need for timely actions and responses
whenever receiving a communication that one of their stations was causing harmful interference
to a safety service, in compliance with RR No. 15.37.
• The Board expressed grave concern about the reported unnecessary transmissions, transmissions
of superfluous signals (jamming) and transmissions of false or misleading signals (spoofing), which
were in direct contravention of RR No. 15.1.
The Board recognized the Bureau’s practice in the application of RR Article 15 when treating cases of harmful
interference and instructed the Bureau to prepare a preliminary draft rule of procedure formalizing that
practice for the Board’s consideration at its 98th meeting.
The Board urged all administrations concerned to:
• comply with all the relevant provisions of Articles 45 and 47 of the ITU Constitution, RR Nos. 4.10,
15.1, 15.28, 15.37 and the resolves of Resolution 676 (WRC-23), in particular when harmful
interference adversely affected safety services;
• to cooperate in goodwill to solve the cases of harmful interference affecting safety services as
promptly as possible.”
The summary of decisions approved at the conclusion of the meeting (Document RRB24-3/23) is now
available on the RRB pages of the ITU-R website.
Yours faithfully,
Mario Maniewicz
Teema: RRB97 Decisions - A.I 6.2
From: Gozal, Karine <
[email protected] <mailto:
[email protected]> >
Sent: Monday, December 2, 2024 3:51 PM
To: TTJA <
[email protected] <mailto:
[email protected]> >; Erko Kulu <
[email protected] <mailto:
[email protected]> >
Subject: RRB97 Decisions - A.I 6.2
Dear Sir,
Following the RRB97th meeting, please find attached a communication from the Director, Radiocommunication Bureau.
Best Regards,
Karine GOZAL
RRB Administrative Assistant
International Telecommunication Union
Tel : +41 22 730 5030 | Fax : +41 22 730 5785
www.itu.int <http://www.itu.int>
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