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Working group document presenting France’s proposal and technical background regarding the assessment and mitigation of interference risks from 5G/MFCN in the 3.4–3.8 GHz band to aeronautical radio altimeters in the 4 200–4 400 MHz band, including interim national protection measures around airports.
Document number: ECC PT1(21)006
Meeting: ECC PT1 #67 Web meeting, 19–21 and 26–28 January 2021
Date issued: 11 December 2020
Source: France
Subject: Protection of radio altimeters from 5G/MFCN in the band 3.4–3.8 GHz
Type of document: Working document and proposal
Organisation: ECC PT1 (CEPT Electronic Communications Committee Project Team 1)
Related report: RTCA Report on 5G interference to radio altimeters (October 2020)
Frequency bands concerned: 3.4–3.8 GHz and 4 200–4 400 MHz
Geographical scope: Europe, with reference to France
Regulatory context: European harmonisation measures for 5G in the 3.5 GHz band
Annex: Immediate measures for the protection of radio altimeters in France
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Parameters and Methodology to Study the Impact of IMT on Radio Altimeters in the 3.4–3.8 GHz and 3.8–4.2 GHz Bands (ECC PT1, issued 19 June 2023)
Year: 2023
Date issued: 19 June 2023
Organization: ECC PT1 (Electronic Communications Committee Project Team 1)
Source: ANFR
Country submitting proposal: France
Document identifier: ECC PT1(23)144
Subject: Impact of IMT/5G base station emissions on aircraft radio altimeters
Frequency bands considered: 3.4–3.8 GHz (MFCN) and 3.8–4.2 GHz (WBB LMP)
Usage category considered: UC1 radio altimeters for civil aviation CAT III automatic landing operations
Technical focus: Interference assessment, coexistence studies, protection criteria for radio altimeters
Methodology elements: Scenario definition, base station parameters, antenna patterns, protection criteria and assumptions
Study scenario: Aircraft landing trajectory near airport runway with nearby 5G base station and user equipment
Propagation model: Free-space path loss (ITU-R P.525-4)
Protection criteria sources: RTCA and AVSI reports
Research phases proposed: Phase 1 – coexistence conditions with existing radio altimeters; Phase 2 – coexistence with future radio altimeter parameters
Target audience: ECC PT1 participants, spectrum regulators, aviation and telecommunications technical experts
Topics: 5GMFCN PT121006 34–38