Radiofrequency field exposure assessment: a pilot study on mobile phone signal strength and transmitted power levels

2019 · Unclear · Low evidence

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UnclearLow evidencePaper 1665

Study snapshot

Publicationmanual · 2019

Study typeexposure_assessment

Reported directionUnclear

Evidence ratingLow

Abstract

Radiofrequency field exposure assessment: a pilot study on mobile phone signal strength and transmitted power levels Brzozek C, Zeleke BM, Abramson MJ, Benke KK, Benke G. Radiofrequency electromagnetic field exposure assessment: a pilot study on mobile phone signal strength and transmitted power levels. J Expo Sci Environ Epidemiol. 2019 Oct 22. doi: 10.1038/s41370-019-0178-6. Abstract In many epidemiological studies mobile phone use has been used as an exposure proxy for radiofrequency electromagnetic field (RF-EMF) exposure. However, RF-EMF exposure assessment from mobile phone use is prone to measurement errors limiting epidemiological research. An often-overlooked aspect is received signal strength levels from base stations and its correlation with mobile phone transmit (Tx) power. The Qualipoc android phone is a tool that provides information on both signal strength and Tx power. The phone produces simultaneous measurements of Received Signal Strength Indicator (RSSI), Reference Signal Received Power (RSRP), Received Signal Code Power (RSCP), and Tx power on the 3G and 4G networks. Measurements taken in the greater Melbourne area found a wide range of signal strength levels. The correlations between multiple signal strength indicators and Tx power were assessed with strong negative correlations found for 3G and 4G data technologies (3G RSSI -0.93, RSCP -0.93; 4G RSSI -0.85, RSRP -0.87). Variations in Tx power over categorical levels of signal strength were quantified and showed large increases in Tx power as signal level decreased. Future epidemiological studies should control for signal strength or factors influencing signal strength to reduce RF-EMF exposure measurement error. Conclusions This study has demonstrated the use of the Qualipoc handheld android phone to assess the correlations between multiple signal strength indicators and Tx power on the 3G and 4G networks in the greater Melbourne area. The phones provided objective measurements of exposure rather than self-reported estimates from surveys. It found Tx power from a mobile phone device varied greatly depending on signal strength level, with exposure differing by orders of magnitude between poor and excellent signal strength levels. In order to reduce measurement error in RF-EMF exposure, data on distance the phone is held from the body and Tx power are required. As Tx power is difficult to measure and costly with the Qualipoc android device, it is recommended that future epidemiological studies control for signal strength as a proxy due to the strong correlations found between signal strength and Tx power. Factors influencing signal strength, such as distance from base station or base station concentration, line of site, vegetation, building materials, and service provider provide measures to control for signal strength. Open access paper: nature.com

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeexposure_assessment

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureRF

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Using a Qualipoc Android phone in the greater Melbourne area, the study observed a wide range of signal strength levels on 3G and 4G networks. Strong negative correlations were reported between signal strength indicators and Tx power (3G: RSSI -0.93, RSCP -0.93; 4G: RSSI -0.85, RSRP -0.87), with Tx power increasing substantially as signal strength decreased, implying exposure differences by orders of magnitude between poor and excellent signal conditions.

Outcomes measured

Mobile phone transmitted (Tx) power
Received signal strength indicators (RSSI, RSRP, RSCP)
Correlation between signal strength and Tx power
Variation in Tx power across categorical signal strength levels

Limitations

Pilot study
Sample size not reported in the abstract
Frequency and SAR not reported
Geographic scope limited to the greater Melbourne area
Tx power measurement described as difficult/costly with the Qualipoc device

View raw extracted JSON

{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Mobile phone transmitted (Tx) power",
    "Received signal strength indicators (RSSI, RSRP, RSCP)",
    "Correlation between signal strength and Tx power",
    "Variation in Tx power across categorical signal strength levels"
  ],
  "main_findings": "Using a Qualipoc Android phone in the greater Melbourne area, the study observed a wide range of signal strength levels on 3G and 4G networks. Strong negative correlations were reported between signal strength indicators and Tx power (3G: RSSI -0.93, RSCP -0.93; 4G: RSSI -0.85, RSRP -0.87), with Tx power increasing substantially as signal strength decreased, implying exposure differences by orders of magnitude between poor and excellent signal conditions.",
  "effect_direction": "unclear",
  "limitations": [
    "Pilot study",
    "Sample size not reported in the abstract",
    "Frequency and SAR not reported",
    "Geographic scope limited to the greater Melbourne area",
    "Tx power measurement described as difficult/costly with the Qualipoc device"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "RF-EMF",
    "radiofrequency electromagnetic fields",
    "exposure assessment",
    "mobile phone",
    "signal strength",
    "transmit power",
    "RSSI",
    "RSRP",
    "RSCP",
    "3G",
    "4G",
    "Qualipoc",
    "measurement error",
    "epidemiology"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.1,
      "reason": "Mentions epidemiological exposure assessment methods, but no specific occupational setting described."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1038/s41370-019-0178-6
PubMed: Not supplied

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