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EMF compliance assessment of radio base stations

EMF compliance assessment of radio base stations. DAVIDE COLOMBI, ERICSSON RESEARCH. outline. Overview of EMF RBS requirements and standards EMF compliance testing of RBS products Research topics Realistic exposure Conclusions. EMF COMPLIANCE OF RBS.

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EMF compliance assessment of radio base stations

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  1. EMF compliance assessment of radio base stations DAVIDE COLOMBI, ERICSSON RESEARCH

  2. outline • Overview of EMF RBS requirements and standards • EMF compliance testing of RBS products • Research topics • Realistic exposure • Conclusions

  3. EMF COMPLIANCE OF RBS International standards providing guidance and requirements on assessment of EMF compliance of RBS Place on the market • ITU-T (Adopted mainly developing countries) • ITU-T K.52 • ITU-T K.61 • ITU-T K.70 • IEC 62232 • 1st ed. published 2012, currently in maintenance phase • CENELEC (Europe) • EN 50383/50384/50385 for place on the market of RBS • EN 50400/50401 for put into service of RBS • Some countries have adopted their own regulation - Product compliance- Laboratory-based Put into service - Put into operation - “Site” compliance

  4. place on the market assessments Why? Provide information about EMF exposure to the user of the product How? Determine compliance boundary (CB), i.e. area outside of which the EMF exposure is below the limit By means of? Calculationsor measurements of SAR / field strengths Antenna • Ambient sources and scatterers are not considered RBS

  5. macro rbs • Field-strength simulations are typically used to assess compliance with reference levels • Accurate and cost-effective • RBS antennas are relatively easy to model • Excellent agreement with measurements Antenna models are based on the design of real RBS antennas

  6. compliance boundary for macro rbs Frequency: 2100 MHzGain: 18 dBiDimension: 1314 x 155 x 70 mm

  7. pico and micro rbs • Compliance distance from 10 to 100 cm • SAR measurements used for small standalone equipment • Power < 1 W only localized SAR (EN 50383) • Power > 1 W localized SAR + spatially averaged field strength • Whole-body SAR measurements standardization is ongoing Available power 1-10 W

  8. research topics surface scan • Fast whole-body SAR measurements method propagationalgorithm • MIMO antennas • mm wave communications prototype, 60 GHz

  9. maximum vs realistic exposure RMS Downlink Power (normalized to maximum) • EMF compliance testing of RBS is conducted assuming constant transmission at the maximum power • The actual transmitted power may be significantly below the maximum Network data collected for more than 5000 RBS in Sweden RBS compliance assessments are not representative of the realistic exposure conditions

  10. Effects of using arbitrary emf limits 1 antenna, WCDMA 2100 MHz, 80 watt output power ICNIRP limits61 V/m compliance distance 6 m Belgium limits3 V/m compliance distance 100 m

  11. Conclusions • EMF compliance testing of RBS products is conducted before placing on the market and putting into service • Place on the market testing of RBS includes determining the compliance boundary • 1 m to 6 m in the main beam direction for macro RBS antenna • 10 cm to 100 cm for small cell RBS products • RBS compliance assessment is not representative of the realistic exposure condition

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