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NR测量方法说明 2.1.pdf
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NR测量方法说明 2.1.pdf
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Federal Institute of Metrology METAS
Technical Report 5G – 18.02.2020 METAS Page 1 of 25
Technical Report: Measurement
Method for 5G NR Base Stations
up to 6 GHz
18 February 2020
(Version 2.1 from 20 April 2020)
Technical Report 5G – 18.02.2020 METAS Page 2 of 25
Publisher Federal Institute of Metrology METAS
Lindenweg 50
3003 Bern-Wabern
Tel. +41 58 387 01 11
www.metas.ch
Copyright This document may not be published or
forwarded other than in full.
Report METAS-report 154.1-2020-5218-1016
This report is available in PDF format at
the following link: http://www.metas.ch/nisv
( Technische Berichte / Rapports techniques/ Rapporti tecnici)
Bern-Wabern, 18 February 2020
Version 2.1: 20 April 2020; changes from version 2.0 are made visible (track change mode)
Technical Report 5G – 18.02.2020 METAS Page 3 of 25
Table of content
1 Introduction ..................................................................................................................... 4
1.1 The Ordinance relating to Protection from Non-Ionising Radiation ........................... 4
1.2 Measurement recommendations .............................................................................. 4
1.3 Motivation and scope of this document .................................................................... 4
1.4 Outline ..................................................................................................................... 4
1.5 Scope ...................................................................................................................... 5
1.6 Application and outlook ............................................................................................ 5
2 Code-selective measurement method ............................................................................. 6
2.1 Measurand .............................................................................................................. 6
2.2 Appreciation value ................................................................................................... 7
2.3 Comment ................................................................................................................. 8
3 Extrapolation factor for the SSS ...................................................................................... 9
4 Antenna Correction Factor ............................................................................................ 10
4.1 Definition ............................................................................................................... 10
4.2 Comment ............................................................................................................... 11
4.3 Simplifications ........................................................................................................ 12
5 Beam statistic factor ..................................................................................................... 13
6 Duplex factor ................................................................................................................ 14
7 Summing all cells and technologies .............................................................................. 14
7.1 Compliance assessment ........................................................................................ 14
8 Frequency selective method ......................................................................................... 15
8.1 Measurand ............................................................................................................ 15
8.2 Appreciation value ................................................................................................. 15
8.3 Compliance assessment ........................................................................................ 16
9 Literature ...................................................................................................................... 17
10 Annex A: Basics in NR (informative) .......................................................................... 18
10.1 SS / PBCH Block structure according to [9] ........................................................... 18
10.2 Timing of the SS/PBCH blocks according to [10] ................................................... 19
11 Annex B: Examples ................................................................................................... 20
11.1 Code-selective measurement ................................................................................ 21
11.2 Frequency-selective measurement ........................................................................ 22
12 Annex C: Definitions, symbols and abbreviations ...................................................... 23
Technical Report 5G – 18.02.2020 METAS Page 4 of 25
1 Introduction
1.1 The Ordinance relating to Protection from Non-Ionising Radiation
The “Ordinance relating to Protection from Non-Ionising Radiation” (ONIR) [1] published in
1999 (in its version of the 1
st
of June 2019), defines
Exposure limit values for electromagnetic fields for frequencies ranging from 0 Hz to
300 GHz (based on ICNIRP [2]).
The so called “installation limit values” that are more stringent than the exposure
limit values. These limit values have been introduced as precautionary limitation of
emissions. They apply to the radiation emitted by one installation in its reference-op-
erating mode, which corresponds (in case of mobile telecommunication systems) to
the operation at maximum “speech and data” traffic and at maximum transmission
power. They have to be respected at places of sensitive use, e.g. apartments, offices,
schools, children’s playgrounds etc.
In other words, compliance assessment of a mobile phone base station includes a measure-
ment of the electric field strength at a defined time as well as an extrapolation of the meas-
ured values to the reference-operating mode.
1.2 Measurement recommendations
As a consequence of the definitions described above, to assess the conformity of an installa-
tion with the legal requirements, a measurement of the electric field strength and additional
calculations are needed. These two steps make it possible to determine the field strengths
that are expected in the reference-operating mode. In order to harmonize the way these
measurements and extrapolations are performed, a series of technology specific “measure-
ment recommendations” or technical reports have already been published: GSM [3], EDGE
[4], UMTS [5], Broadcasting [6], and LTE [7].
1.3 Motivation and scope of this document
With the introduction of New Radio (NR) as a technology in the 5G mobile telecommunica-
tion networks, it is necessary to develop a reference method for measuring field levels of NR
installations in indoor and outdoor environments. The method should be:
robust and practicable,
providing extrapolations that are accurate, avoiding over- or underestimation of the
electric field strength in the reference operating mode,
taking into account the beam steering features of the 5G technology,
taking into account the variability of the transmission direction and antenna pattern
from adaptive antennas according to annex 1, paragraph 63 of the ONIR [1], as of 1
st
of June 2019,
in line with the previous measurement recommendations,
applicable to FDD as well as to TDD duplexing modes.
1.4 Outline
As in the case of the previous measurement recommendations, two different methods are
proposed here:
The code-selective method allows the compliance assessment of an installation with
the installation limit value and is considered as the reference method.
The spectral method (frequency selective method) does not allow the distinction of
two different cells of the same operator/installation. Moreover, it suffers from overesti-
mation of the extrapolated field strength of the reference-operating mode. While it is
Technical Report 5G – 18.02.2020 METAS Page 5 of 25
able to demonstrate compliance of an installation with the regulation, it fails to make a
final assessment on the non-compliance (even if the extrapolated field strength ex-
ceeds the installation limit value). This method is therefore considered as an approxi-
mate method (“Orientierende Messung”).
1.5 Scope
According to release 15 of the 5G-release 15 standard [8], the NR technology covers two fre-
quency ranges: the first frequency range from 450 MHz to 6 GHz, and the second frequency
range from 24.5 GHz to 52.6 GHz. The present report is restricted to the first frequency
range up to 6 GHz.
1.6 Application and outlook
This document includes a statistical extrapolation (reduction) for adaptive antennas that has
for the moment a conservative default value of 1. The precise value has to be defined in an
execution recommendation to the ONIR [1].
This document can be applied for compliance tests of NR base stations with respect to the
ONIR, until a new version or an official measurement recommendation of the Federal Insti-
tute of Metrology (METAS) and the Federal Office for the Environment (FOEN) is published.
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