Radio Regulations

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

All IBR Recommendations
M

Recommendation ITU-R M.1652-1

Mandatory (2003-2011)

Dynamic frequency selection in wireless access systems including radio local area networks for the purpose of protecting the radiodetermination service in the 5 GHz band

— Annex 1 and Annex 5

View official text at ITU

Version history

Version evolution

The number in each cell (e.g. −9) is the Recommendation's revision number — the “-9” in ITU-R M.585-9, not a negative value. So −8 → −9 means the binding reference moved from the 8th to the 9th revision.

RR-2008 -0
RR-2012 -1
RR-2016 -1
RR-2020 -1
RR-2024 -1

Incorporated into the RR by

RR provisions, footnotes and Resolutions that incorporate this Recommendation

Footnote

5.446A 5.447F 5.450A

Resolution

Resolution 229 (Rev.WRC-23)

Where it applies

Frequency bands and radio services this Recommendation reaches, derived from the RR footnotes that incorporate it.

Radio services

AERONAUTICAL RADIONAVIGATION AMATEUR (2°) EARTH EXPLORATION-SATELLITE FIXED-SATELLITE MARITIME RADIONAVIGATION MOBILE RADIOLOCATION SPACE RESEARCH

Frequency bands

ITU RR table: 4 800-5 250 MHz ITU RR table: 5 250-5 570 MHz ITU RR table: 5 570-6 700 MHz

Scope

This Recommendation provides requirements of dynamic frequency selection (DFS) as a mitigation technique to be implemented in wireless access systems (WAS) including radio local area networks (RLANs) for the purpose of facilitating sharing with the radiodetermination service in the 5 GHz band. Annex 1 specifies the detection, operational and response requirements. Other Annexes address the methodologies and provide information which can be used by administrations when conducting sharing studies between radars and WAS including RLANs.

Recommends

  1. that, in order to facilitate sharing with radars, mitigation techniques as described in Annex 1 be implemented by WAS, including RLANs in the bands used by radars at 5 GHz;
  2. that the mitigation techniques comply with the detection, operational and response requirements as given in § 2 of Annex 1;
  3. that the methodologies given in Annexes 4, 5, 6 and 7 can be used by administrations when conducting sharing studies between radars and WAS including RLANs.
  4. NOTE 1 – Further information on the results of studies on the requirements stated in recommends 2 is given in Report ITU-R M.2115, which provides information on the procedures in place in various administrations and/or regional groups to test compliance with DFS requirements.

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.