SIST EN 300 674-2-2 V2.2.1:2019

HARMONISED EUROPEAN STANDARD
Transport and Traffic Telematics (TTT);
Dedicated Short Range Communication (DSRC)
transmission equipment (500 kbit/s / 250 kbit/s)
operating in the 5 795 MHz to 5 815 MHz frequency band;
Part 2: Harmonised Standard for access to radio spectrum;
Sub-part 2: On-Board Units (OBU)

2 ETSI EN 300 674-2-2 V2.2.1 (2019-06)

Reference
REN/ERM-TG37-272
Keywords
data, DSRC, harmonised standard, radio,
regulation, RTTT, testing
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3 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
Contents
Intellectual Property Rights . 6
Foreword . 6
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 9
3 Definition of terms, symbols and abbreviations . 9
3.1 Terms . 9
3.2 Symbols . 11
3.3 Abbreviations . 13
4 Technical requirements specifications . 14
4.1 General characteristics . 14
4.1.1 OBU sets . 14
4.1.2 Uplink sub-carrier frequencies . 14
4.1.3 Carrier frequencies . 14
4.1.4 Modulation . 14
4.2 Environmental conditions . 15
4.2.1 Environmental profile . 15
4.2.2 Power supply . 15
4.3 Conformance requirements . 15
4.3.1 Transmitter requirements . 15
4.3.1.1 Transmitter spectrum mask . 15
4.3.1.2 Maximum equivalent isotropically radiated power . 15
4.3.1.3 Transmitter frequency error . 16
4.3.1.4 Transmitter unwanted emissions . 16
4.3.2 Receiver requirements . 16
4.3.2.1 Receiver unwanted emissions in the spurious domain . 16
4.3.2.2 Sensitivity . 17
4.3.2.3 Receiver selectivity . 17
4.3.2.3.1 General . 17
4.3.2.3.2 Receiver spurious response rejection and adjacent channel rejection . 17
4.3.2.3.3 Receiver blocking . 18
4.3.2.3.4 Co-channel rejection . 18
4.3.3 Antennas . 18
5 Testing for compliance with technical requirements . 19
5.1 Environmental conditions for testing . 19
5.2 Interpretation of the measurement results . 19
5.3 Radio test suites . 20
5.3.1 Transmitter parameters . 20
5.3.1.1 Transmitter spectrum mask . 20
5.3.1.1.1 General . 20
5.3.1.1.2 Radiated measurements . 20
5.3.1.1.3 Conducted measurements . 22
5.3.1.2 Maximum equivalent isotropically radiated power . 23
5.3.1.2.1 General . 23
5.3.1.2.2 Radiated measurement . 24
5.3.1.2.3 Conducted measurement. 25
5.3.1.3 Transmitter frequency error . 25
5.3.1.3.1 General . 25
5.3.1.3.2 Radiated measurements . 26
5.3.1.3.3 Conducted measurements . 26
5.3.1.4 Transmitter unwanted emissions . 27
5.3.1.4.1 General . 27
5.3.1.4.2 Radiated measurement . 27
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4 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
5.3.2 Receiver parameters . 28
5.3.2.1 Receiver unwanted emissions in the spurious domain . 28
5.3.2.1.1 General . 28
5.3.2.1.2 Radiated measurement . 28
5.3.2.2 Sensitivity . 29
5.3.2.2.1 General . 29
5.3.2.2.2 Radiated measurements . 29
5.3.2.2.3 Conducted measurements . 29
5.3.2.3 Receiver selectivity . 30
5.3.2.3.1 General . 30
5.3.2.3.2 Unwanted signal characteristics . 30
5.3.2.3.3 Measurement of receiver selectivity in OBU boresight . 30
Annex A (informative): Relationship between the present document and the essential
requirements of Directive 2014/53/EU . 32
Annex B (normative): Basics on testing . 33
B.1 General conditions . 33
B.1.1 Thermal balance . 33
B.1.2 Test signals . 33
B.1.3 Test sites . 34
B.1.3.1 Shielded anechoic chamber. 34
B.1.3.2 Open area test site . 35
B.1.3.3 Test fixture . 35
B.1.4 General requirements for RF cables . 36
B.1.5 Conducted measurements . 37
B.1.5.1 One antenna connector arrangement . 37
B.1.5.2 Two antenna connectors arrangement. 38
B.1.5.3 Test site requirements . 38
B.1.5.4 Site preparation for conducted measurements . 38
B.1.5.4.1 Monochromatic signals . 38
B.1.5.4.2 Modulated signals . 38
B.1.6 Radiated measurements . 39
B.1.6.1 One antenna arrangement . 39
B.1.6.2 Two antennas arrangement . 40
B.1.6.3 Test site requirements . 41
B.1.6.3.1 Measurement distances . 41
B.1.6.3.2 Free-space wave propagation . 41
B.1.6.4 Test and substitution antennas . 42
B.1.6.5 Site preparation for radiated OBU measurements . 42
B.1.6.5.1 Monochromatic signals . 42
B.1.6.5.2 Modulated signals . 44
B.1.6.5.3 Arrangement for OBU transmitter unwanted emissions measurement . 45
B.1.6.5.4 Arrangement for OBU receiver selectivity measurement . 47
B.2 Instruments . 49
B.2.1 Receiving device . 49
B.2.2 RF power sensor . 49
B.2.3 Combiner . 50
B.3 Power of modulated RSU carrier . 50
B.4 Bit error ratio measurements . 51
B.4.1 Basics . 51
B.4.2 BER measurement . 51
B.4.3 FER measurement . 51
B.4.3.1 Mathematical expressions . 51
B.4.3.2 Equipment . 52
B.4.3.3 Procedure . 52
Annex C (normative): Environmental profile . 53
C.1 General Requirements . 53
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5 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
C.2 Mandatory environmental conditions . 53
C.3 Additional environmental conditions . 53
Annex D (informative): Maximum Measurement Uncertainty . 54
Annex E (informative): Bibliography . 55
Annex F (informative): Change History . 56
History . 57

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6 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This Harmonised European Standard (EN) has been produced by ETSI Technical Committee Electromagnetic
compatibility and Radio spectrum Matters (ERM).
The present document has been prepared under the Commission's standardisation request C(2015) 5376 final [i.3] to
provide one voluntary means of conforming to the essential requirements of Directive 2014/53/EU on the harmonisation
of the laws of the Member States relating to the making available on the market of radio equipment and repealing
Directive 1999/5/EC [i.2].
Once the present document is cited in the Official Journal of the European Union under that Directive, compliance with
the normative clauses of the present document given in table A.1 confers, within the limits of the scope of the present
document, a presumption of conformity with the corresponding essential requirements of that Directive and associated
EFTA regulations.
The present document is part 2, sub-part 2 of a multi-part deliverable covering Transport and Traffic Telematics (TTT);
Dedicated Short Range Communication (DSRC) transmission equipment (500 kbit/s / 250 kbit/s) operating in the
5 795 MHz to 5 815 MHz frequency band, as identified below:
Part 1: "General characteristics and test methods for Road Side Units (RSU) and On-Board Units (OBU)";
Part 2: "Harmonised Standard for access to radio spectrum";
Sub-part 1: "Road Side Units (RSU)";
Sub-part 2: "On-Board Units (OBU)".

National transposition dates
Date of adoption of this EN: 17 June 2019
Date of latest announcement of this EN (doa): 30 September 2019
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 March 2020
Date of withdrawal of any conflicting National Standard (dow): 31 March 2021

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7 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

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8 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
1 Scope
The present document specifies technical characteristics and methods of measurements for Transport and Traffic
Telematics (TTT) systems:
• with a Radio Frequency (RF) output connection and specified antenna or with an integral antenna;
• for data transmission only;
• operating in the 5 795 MHz to 5 815 MHz frequency band.
The applicability of the present document covers only the On Board Units (OBU).
The present document complies with the Commission Implementing Decision 2017/1483/EU [i.4] and CEPT/ERC
Recommendation 70-03 [i.6].
The present document applies to the following radio equipment types operating in all or in part of the following service
frequency bands given in table 1.
Table 1: Frequency bands and centre frequencies f allocated for DSRC
Tx
Pan European Service Frequencies National Service Frequencies
Channel 1 5,795 GHz to 5,800 GHz, f = 5,7975 GHz
Tx
Channel 2 5,800 GHz to 5,805 GHz, f = 5,8025 GHz
Tx
Channel 3 5,805 GHz to 5,810 GHz, f = 5,8075 GHz
Tx
Channel 4 5,810 GHz to 5,815 GHz, f = 5,8125 GHz
Tx
NOTE: The relationship between the present document and essential requirements of article 3.2 of
Directive 2014/53/EU [i.2] is given in annex A.
2 References
2.1 Normative references
References are specific, identified by date of publication and/or edition number or version number. Only the cited
version applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] CEN EN 12253 (2004): "Road transport and traffic telematics - Dedicated short-range
communication - Physical layer using microwave at 5,8 GHz".
[2] ISO 14906 (2018): "Electronic fee collection -- Application interface definition for dedicated
short-range communication".
[3] CEPT/ERC Recommendation 74-01E (2011): "Unwanted emissions in the spurious domain".
[4] CEN EN 13372 (2004): "Road Transport and Traffic Telematics (RTTT) - Dedicated short-range
communication - Profiles for RTTT applications".
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9 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI TS 103 052 (V1.1.1) (03-2011): "Electromagnetic compatibility and Radio spectrum Matters
(ERM); Radiated measurement methods and general arrangements for test sites up to 100 GHz".
[i.2] Directive 2014/53/EU of the European Parliament and of the Council of 16 April 2014 on the
harmonisation of the laws of the Member States relating to the making available on the market of
radio equipment and repealing Directive 1999/5/EC.
[i.3] Commission Implementing Decision C(2015) 5376 final of 4.8.2015 on a standardisation request
to the European Committee for Electrotechnical Standardisation and to the European
Telecommunications Standards Institute as regards radio equipment in support of Directive
2014/53/EU of the European Parliament and of the Council.
[i.4] Commission Implementing Decision (EU) 2017/1483 of 8 August 2017 amending Decision
2006/771/EC on harmonisation of the radio spectrum for use by short-range devices and repealing
Decision 2006/804/EC" .
[i.5] Void.
[i.6] CEPT/ERC Recommendation 70-03 (May 2018): "Relating to the use of Short Range Devices
(SRD)".
[i.7] ETSI TR 102 273-2 (V1.2.1) (12-2001): "Electromagnetic compatibility and Radio spectrum
Matters (ERM); Improvement on Radiated Methods of Measurement (using test site) and
evaluation of the corresponding measurement uncertainties; Part 2: Anechoic chamber".
[i.8] ETSI TR 102 273-6 (V1.2.1) (12-2001): "Electromagnetic compatibility and Radio spectrum
Matters (ERM); Improvement on Radiated Methods of Measurement (using test site) and
evaluation of the corresponding measurement uncertainties; Part 6: Test fixtures".
[i.9] IEC 60721-3-4 (1995) including Amendment 1 (1996): "Classification of environmental
conditions - Part 3: Classification of groups of environmental parameters and their severities -
Section 4: Stationary use at non-weather protected locations".
[i.10] IEC 60721-3-5 (1997): "Classification of environmental conditions - Part 3: Classification of
groups of environmental parameters and their severities - Section 5: Ground vehicle installations".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the terms given in Directive 2014/53/EU [i.2] and the following apply:
adjacent channel: channel at a distance of 5 MHz relative to the centre frequency, i.e. in the channel at the next upper
or lower centre frequency within the frequency band allocated for DSRC (see table 3)
bit: acronym for "binary digit" which can have one out of two possible values
EXAMPLE: 0/1, or +1/-1, or low/high.
bit rate: in a bit stream, the number of bits occurring per unit time, usually expressed in bits per second
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10 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
boresight: direction of maximum radiation of a directional antenna
NOTE: If boresight cannot be determined unambiguously, then boresight may be declared by the manufacturer.
carrier frequency: frequency f to which the RSU transmitter is tuned
Tx
NOTE: In DSRC, the carrier frequency is in the centre of a channel, see table 3 of the present document.
carrier signal or carrier: harmonic signal whose nominal single frequency f can vary within a range specified by the
Tx
carrier frequency tolerance and which is capable of being modulated by a second, symbol-carrying signal
channel: continuous part of the radio-frequency spectrum to be used for a specified emission or transmission
NOTE: A radio-frequency channel may be defined by two specified limits, or by its centre frequency and its
bandwidth, or any equivalent indication. It is often designated by a sequential number. A radio-frequency
channel may be time-shared in order to allow radio communication in both directions by simplex
operation. The term "channel" is sometimes used to denote two associated radio-frequency channels, each
of which is used for one of two directions of transmission, i.e. in fact a telecommunication circuit.
co-channel: transmission using the same channel (frequency band of 5 MHz width)
cross-polar discrimination (XPD): the ratio P / P of power P of the left hand circular polarized wave to
LHCP RHCP LHCP
the power P of the right hand circular wave when the total power of the transmitted wave is P + P
RHCP LHCP RHCP
downlink: transmission in direction from RSU to OBU
ellipticity of polarization: ratio of the polarization main axes of an elliptic polarized radio wave
EXAMPLE: The ellipticity of circular polarized radio waves is one.
The ellipticity of linear polarized waves is infinity.
environmental profile: range of environmental conditions
equivalent isotropically radiated power: signal power fed into an ideal loss-less antenna radiating equally in all
directions that generates the same power flux at a reference distance as the one generated by a signal fed into the
antenna under consideration in a predefined direction within its far field region
integral antenna: antenna, with or without a connector, designed as an indispensable part of the equipment
OBU sleep mode: optional mode for battery powered OBUs that allows to save battery power
NOTE: In this mode, the OBU can only detect the presence of a DSRC downlink signal to initiate under certain
defined conditions a transition to the stand-by mode.
OBU stand-by mode: mode, in which the OBU is capable of receiving DSRC downlink signals, but is never
transmitting
operating frequency: nominal frequency at which equipment is operated; also referred to as the operating centre
frequency
NOTE: Equipment may be able to operate at more than one operating frequency.
out-of-band emissions: emissions on a frequency or frequencies immediately outside the necessary bandwidth which
results from the modulation process and which cannot be reduced without affecting the corresponding transmission of
information, but excluding spurious emissions (see also CEPT/ERC Recommendation 74-01E [3])
polarization: locus of the tip of the electrical field vector in a plane perpendicular to the direction of transmission
EXAMPLE: Horizontal and vertical linear polarization
Left and right hand circular polarization.
Portable Equipment (PE): generally intended to be self-contained, free standing and portable
NOTE: A PE would normally consist of a single module, but may consist of several interconnected modules. It is
powered by one or more internal batteries.
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11 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
radiated measurements: measurements which involve the measurement of a radiated electromagnetic field
spurious emissions: emission on a frequency, or frequencies, which are outside an exclusion band of ±2,5 times the
channel spacing around the selected centre frequency f , and the level of which may be reduced without affecting the
Tx
corresponding transmission of information
NOTE: Spurious emissions include harmonic emissions, parasitic emissions, intermodulation products and
frequency conversion products but exclude out-of-band emissions (see also CEPT/ERC
Recommendation 74-01E [3]).
uplink: transmission in direction from OBU to RSU
3.2 Symbols
For the purposes of the present document, the following symbols apply:
A Amplitude of CW signal
CW
A Amplitude of modulated signal
mod
ATN Attenuation of attenuator AT2
AT2
ATN Attenuation of balun BLN
BLN
ATN Attenuation of coaxial cable 1
CA1
BER Bit error ratio
C Number of frames transmitted
F
C Number of erroneous frames received
E
d Distance between phase centres of transmitting and receiving antenna
d Horizontal displacement of TTA and RTA antenna phase centres
displace
d Distance from transmitting antenna to first Fresnel ellipse
F1
d Distance from first Fresnel ellipse to receiving antenna
F2
D Distance between neighbouring ferrite beads
fb
D Directivity relative to an isotropic radiator
i
Largest linear dimension of test antenna
D
0,TA
D Largest linear dimension of EUT antenna
0,EUT
EIRP Maximum e.i.r.p. of RSU
max
EIRP Maximum e.i.r.p. generated by the OBU in a single side band
MaxObuTx
EIRP e.i.r.p. generated by the OBU within a single side band
ObuTx
EIRP e.i.r.p. generated by the OBU antenna
OBU
EIRP e.i.r.p. referred to transmitter spectrum mask
TSM
Δf Frequency error of RSU
RSU
Δf Sub-carrier frequency error
s
f Frequency
f Centre frequency of receiving device or of MSS2 used for calibration
c
FER Frame error ratio
f Actual centre frequency of the lower and upper side band of the OBU uplink channel
ObuTx
f Frequency of MSS1
MSS1
f Offset frequency
offset
f Nominal OBU sub-carrier frequency
s
f Nominal RSU carrier frequency
Tx
f Actual centre frequency of the downlink carrier
Tx,actual
f Nominal centre frequency of unwanted signal
u
f , f Centre frequencies of unwanted signal
u1 u2
G Conversion gain
c
G Correction gain
corr
G Gain of OBU receiving antenna
OBU,Rx
G Gain of OBU transmitting antenna
OBU,Tx
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12 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
G Gain of receiving substitution antenna
RSA
G Gain of test antenna
TA
G Gain of transmitting substitution antenna
TSA
G Gain of RSU transmitting antenna
RSU,Tx
k Expansion factor (coverage factor)
lg(.) Logarithm to the base ten
m Modulation index
Mc Location of the OBU antenna phase centre
N Total number of transmitted bits within a single frame
P Power of CW signal
CW
P Power limit for communication (upper)
D11a
P Power limit for communication (lower)
D11b
P Incident signal power as received by an ideal isotropical receiving antenna
inc
Incident signal power obtained from a scanning process
P
inc,scan
P P in dBm
inc,dBm inc
P Signal power of left hand circular polarized wave
LHCP
P Maximum signal power
max
P Power of modulated signal
mod
P Output signal power of MSS1
MMS1
P Output signal power of MSS2
MMS2
P Incident signal power to OBU, referred to an ideal isotropical receiving antenna
ObuRx
P Signal power of wave with corresponding polarization
pol
P Signal power of wave featuring vertical polarization
v
P Signal power of wave featuring horizontal polarization
h
P Signal power measured by the power meter 1
PM1
P Reference signal power limit in Watt
ref
P Reference signal power limit in dBm
ref,dBm
P Retransmitted signal power
reTx
P Signal power obtained from receiving substitution antenna
RSA
P Signal power of right hand circular polarized wave
RHCP
P Signal power within single side band
ssb
P Sensitivity of receiver
sens
P Signal power of spurious signal
spurious
P Sum of signal power P + P , or P + P + . + P , whichever applies
tot 1 2 1 2 5
P P in dBm
tot,dBm tot
P Transmitter spectrum mask
TSM
P Power of unwanted signal at OBU antenna
u
P Unwanted signal power limit at OBU antenna
u max
P Signal power of wanted signal
w
P Reference signal power of 1 mW corresponding to 0 dBm
RBW Resolution bandwidth
T Duration of CW signal
CW
T Duration of modulated signal
mod
V , V Maximal amplitude of modulated output signal of RSU caused by data bit 1, or 0
max min
α Tilt angle of test antenna
α Displacement angle between TTA and RTA
displace
θ Angle relative to OBU boresight indicating worst case direction

θ° Value of θ measured in degree
Wavelength
λ
ρ Reflection coefficient at antenna connector of the receiving substitution antenna
RSA
ρ Reflection coefficient at antenna connector of the transmitting substitution antenna
TSA
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13 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
3.3 Abbreviations
For the purposes of the present document the abbreviations given in CEN EN 12253 [1] and the following apply:
ASG Arbitrary Signal Generator
AT1 ATtenuator 1
AT2 ATtenuator 2
BER Bit Error Ratio
BLN BaLuN
BST Beacon Service Table
CA Corresponding Antenna
CC Coaxial Circulator
CRC Cyclic Redundancy Checking
CW Continuous Wave
DSRC Dedicated Short Range Communication
e.i.r.p. equivalent isotropically radiated power
NOTE: Also called EIRP, eirp, E.I.R.P.
EC European Community
EUT Equipment Under Test
FCCA Ferrited Coaxial CAble
FCCA1 Ferrited Coaxial CAble 1
FER Frame Error Ratio
LHCP Left Hand Circular Polarized
LOS Line-Of-Sight
LP Linear Polarized
M Centre point between phase centres of TTA and RTA
centre
MSS1 Monochromatic Signal Source 1
MSS2 Monochromatic Signal Source 2
n.a. not applicable
OBU On Board Unit
PE Portable Equipment
PM1 Power Meter 1
RBW Resolution BandWidth
RD Receiving Device
RF Radio Frequency
RRxA RSU Receiving Antenna
RSA Receiving Substitution Antenna
RSU Road Side Unit
RTA Receiving Test Antenna
RTTT Road Transport and Traffic Telematics
RTxA RSU Transmitting Antenna
Rx Receiver
SMS1 Signal or Message Source 1
SR Special Report
SSB Single Side Band
TA Test Antenna
TM1 Test Message 1
TS1 Test Signal 1
TS2 Test Signal 2
TSA Transmitting Substitution Antenna
TSM Transmitter Spectrum Mask
TTA Transmitting Test Antenna
Tx Transmitter
VBW Video Band Width
VST Vehicle Service Table
VSWR Voltage Standing Wave Ratio
XP Cross Polarized
XPD Cross-Polar Discrimination
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14 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
4 Technical requirements specifications
4.1 General characteristics
4.1.1 OBU sets
There exist two sets of OBUs called Set A and Set B which differ by the parameters in table 2 either in terms of value or
applicability, and which are defined in CEN EN 13372 [4].
Table 2: Differences in OBU Sets
CEN EN 12253 [1] Set A Set B
parameter abbreviation
D11a Power limit for communication (upper): See table 12
D12 n.a. Cut off power level of OBU: -60 dBm
U4a Maximum SSB e.i.r.p. (boresight): See table 5
U4b n.a. Maximum SSB e.i.r.p.: See table 5
U12b n.a. Conversion gain (upper limit): 10 dB for each side band

The manufacturer shall declare which Set the unit complies with.
4.1.2 Uplink sub-carrier frequencies
The sub-carrier signal or sub-carrier is a signal whose nominal single frequency f can vary within a range specified by
s
the sub-carrier frequency tolerance and which shall be capable of being modulated by a second, symbol-carrying signal,
see clause 4.1.4.
The uplink sub-carrier frequency is referred to as parameter U1 in CEN EN 12253 [1].
Every DSRC OBU shall support the two sub-carrier frequencies f of 1,5 MHz and 2,0 MHz.
s
4.1.3 Carrier frequencies
According to parameter D3 in CEN EN 12253 [1] every OBU shall be able to operate in all DSRC channels as indicated
in table 3.
defined for channel 1
For tests of OBU parameters described in the present document, only the carrier frequencies f
Tx
and channel 4 in table 3 shall be considered.
Table 3: Frequency bands and centre frequencies f allocated for DSRC
Tx
Pan European Service Frequencies National Service Frequencies
Channel 1 5,795 GHz to 5,800 GHz, f = 5,7975 GHz n.a.
Tx
Channel 2 5,800 GHz to 5,805 GHz, f = 5,8025 GHz n.a.
Tx
Channel 3 n.a. 5,805 GHz to 5,810 GHz, f = 5,8075 GHz
Tx
Channel 4 n.a. 5,810 GHz to 5,815 GHz, f = 5,8125 GHz
Tx
4.1.4 Modulation
The uplink sub-carrier (see clause 4.1.2) shall be modulated according to parameters U1b, U6, U6b and U6c defined in
CEN EN 12253 [1]. The modulated uplink sub-carrier then shall be used to modulate the carrier at frequency f
Tx
received from a RSU, i.e. the modulated sub-carrier shall be multiplied with the received carrier.
ETSI
15 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
4.2 Environmental conditions
4.2.1 Environmental profile
The technical requirements of the present document shall apply under the mandatory environmental profile for intended
operation of the equipment as specified in clause C.2. The equipment shall comply with all the technical requirements
of the present document which are identified as applicable in annex A at all times when operating within the boundary
limits of the mandatory environmental profile.
The manufacturer may additionally select environmental profiles specified in clause C.3 for testing.
4.2.2 Power supply
All the characteristics and essential requirements applying to OBUs shall be fulfilled within the range of all declared
operational conditions of the power supply.
Power supply may be e.g. a built-in battery, an external battery or a stabilized power supply.
The behaviour of the OBU shall be within the limits specified in the present document, independently of voltages in the
range of maximum and decreasing until the OBU switch off transmissions.
4.3 Conformance requirements
4.3.1 Transmitter requirements
4.3.1.1 Transmitter spectrum mask
The OBU transmitter spectrum mask (TSM) is the maximum e.i.r.p. allowed to be transmitted by the OBU within
specified frequency bands. The frequency bands are defined by their centre frequencies and bandwidths according to
table 4 considering carrier frequencies f in accordance with clause 4.1.3.
Tx
The OBU TSM is r
...

SLOVENSKI STANDARD
01-september-2019
Transportna in prometna telematika (TTT) - Oddajniška oprema za enouporabniško
(osebno) komunikacijo kratkega dosega (DSRC) (s prenosnima hitrostma 500
kbit/s / 250 kbit/s), ki deluje v frekvenčnem pasu od 5795 MHz do 5815 MHz - 2. del:
Harmonizirani standard za dostop do radijskega spektra - 2. poddel: Enote na
vozilu (OBU)
Transport and Traffic Telematics (TTT) - Dedicated Short Range Communication
(DSRC) transmission equipment (500 kbit/s / 250 kbit/s) operating in the 5 795 MHz to 5
815 MHz frequency band - Part 2: Harmonised Standard for access to radio spectrum -
Sub-part 2: On-Board Units (OBU)
Ta slovenski standard je istoveten z: ETSI EN 300 674-2-2 V2.2.1 (2019-06)
ICS:
33.060.99 Druga oprema za radijske Other equipment for
komunikacije radiocommunications
35.240.60 Uporabniške rešitve IT v IT applications in transport
prometu
43.040.15 Avtomobilska informatika. Car informatics. On board
Vgrajeni računalniški sistemi computer systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

HARMONISED EUROPEAN STANDARD
Transport and Traffic Telematics (TTT);
Dedicated Short Range Communication (DSRC)
transmission equipment (500 kbit/s / 250 kbit/s)
operating in the 5 795 MHz to 5 815 MHz frequency band;
Part 2: Harmonised Standard for access to radio spectrum;
Sub-part 2: On-Board Units (OBU)

2 ETSI EN 300 674-2-2 V2.2.1 (2019-06)

Reference
REN/ERM-TG37-272
Keywords
data, DSRC, harmonised standard, radio,
regulation, RTTT, testing
ETSI
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ETSI
3 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
Contents
Intellectual Property Rights . 6
Foreword . 6
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 9
3 Definition of terms, symbols and abbreviations . 9
3.1 Terms . 9
3.2 Symbols . 11
3.3 Abbreviations . 13
4 Technical requirements specifications . 14
4.1 General characteristics . 14
4.1.1 OBU sets . 14
4.1.2 Uplink sub-carrier frequencies . 14
4.1.3 Carrier frequencies . 14
4.1.4 Modulation . 14
4.2 Environmental conditions . 15
4.2.1 Environmental profile . 15
4.2.2 Power supply . 15
4.3 Conformance requirements . 15
4.3.1 Transmitter requirements . 15
4.3.1.1 Transmitter spectrum mask . 15
4.3.1.2 Maximum equivalent isotropically radiated power . 15
4.3.1.3 Transmitter frequency error . 16
4.3.1.4 Transmitter unwanted emissions . 16
4.3.2 Receiver requirements . 16
4.3.2.1 Receiver unwanted emissions in the spurious domain . 16
4.3.2.2 Sensitivity . 17
4.3.2.3 Receiver selectivity . 17
4.3.2.3.1 General . 17
4.3.2.3.2 Receiver spurious response rejection and adjacent channel rejection . 17
4.3.2.3.3 Receiver blocking . 18
4.3.2.3.4 Co-channel rejection . 18
4.3.3 Antennas . 18
5 Testing for compliance with technical requirements . 19
5.1 Environmental conditions for testing . 19
5.2 Interpretation of the measurement results . 19
5.3 Radio test suites . 20
5.3.1 Transmitter parameters . 20
5.3.1.1 Transmitter spectrum mask . 20
5.3.1.1.1 General . 20
5.3.1.1.2 Radiated measurements . 20
5.3.1.1.3 Conducted measurements . 22
5.3.1.2 Maximum equivalent isotropically radiated power . 23
5.3.1.2.1 General . 23
5.3.1.2.2 Radiated measurement . 24
5.3.1.2.3 Conducted measurement. 25
5.3.1.3 Transmitter frequency error . 25
5.3.1.3.1 General . 25
5.3.1.3.2 Radiated measurements . 26
5.3.1.3.3 Conducted measurements . 26
5.3.1.4 Transmitter unwanted emissions . 27
5.3.1.4.1 General . 27
5.3.1.4.2 Radiated measurement . 27
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4 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
5.3.2 Receiver parameters . 28
5.3.2.1 Receiver unwanted emissions in the spurious domain . 28
5.3.2.1.1 General . 28
5.3.2.1.2 Radiated measurement . 28
5.3.2.2 Sensitivity . 29
5.3.2.2.1 General . 29
5.3.2.2.2 Radiated measurements . 29
5.3.2.2.3 Conducted measurements . 29
5.3.2.3 Receiver selectivity . 30
5.3.2.3.1 General . 30
5.3.2.3.2 Unwanted signal characteristics . 30
5.3.2.3.3 Measurement of receiver selectivity in OBU boresight . 30
Annex A (informative): Relationship between the present document and the essential
requirements of Directive 2014/53/EU . 32
Annex B (normative): Basics on testing . 33
B.1 General conditions . 33
B.1.1 Thermal balance . 33
B.1.2 Test signals . 33
B.1.3 Test sites . 34
B.1.3.1 Shielded anechoic chamber. 34
B.1.3.2 Open area test site . 35
B.1.3.3 Test fixture . 35
B.1.4 General requirements for RF cables . 36
B.1.5 Conducted measurements . 37
B.1.5.1 One antenna connector arrangement . 37
B.1.5.2 Two antenna connectors arrangement. 38
B.1.5.3 Test site requirements . 38
B.1.5.4 Site preparation for conducted measurements . 38
B.1.5.4.1 Monochromatic signals . 38
B.1.5.4.2 Modulated signals . 38
B.1.6 Radiated measurements . 39
B.1.6.1 One antenna arrangement . 39
B.1.6.2 Two antennas arrangement . 40
B.1.6.3 Test site requirements . 41
B.1.6.3.1 Measurement distances . 41
B.1.6.3.2 Free-space wave propagation . 41
B.1.6.4 Test and substitution antennas . 42
B.1.6.5 Site preparation for radiated OBU measurements . 42
B.1.6.5.1 Monochromatic signals . 42
B.1.6.5.2 Modulated signals . 44
B.1.6.5.3 Arrangement for OBU transmitter unwanted emissions measurement . 45
B.1.6.5.4 Arrangement for OBU receiver selectivity measurement . 47
B.2 Instruments . 49
B.2.1 Receiving device . 49
B.2.2 RF power sensor . 49
B.2.3 Combiner . 50
B.3 Power of modulated RSU carrier . 50
B.4 Bit error ratio measurements . 51
B.4.1 Basics . 51
B.4.2 BER measurement . 51
B.4.3 FER measurement . 51
B.4.3.1 Mathematical expressions . 51
B.4.3.2 Equipment . 52
B.4.3.3 Procedure . 52
Annex C (normative): Environmental profile . 53
C.1 General Requirements . 53
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5 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
C.2 Mandatory environmental conditions . 53
C.3 Additional environmental conditions . 53
Annex D (informative): Maximum Measurement Uncertainty . 54
Annex E (informative): Bibliography . 55
Annex F (informative): Change History . 56
History . 57

ETSI
6 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This Harmonised European Standard (EN) has been produced by ETSI Technical Committee Electromagnetic
compatibility and Radio spectrum Matters (ERM).
The present document has been prepared under the Commission's standardisation request C(2015) 5376 final [i.3] to
provide one voluntary means of conforming to the essential requirements of Directive 2014/53/EU on the harmonisation
of the laws of the Member States relating to the making available on the market of radio equipment and repealing
Directive 1999/5/EC [i.2].
Once the present document is cited in the Official Journal of the European Union under that Directive, compliance with
the normative clauses of the present document given in table A.1 confers, within the limits of the scope of the present
document, a presumption of conformity with the corresponding essential requirements of that Directive and associated
EFTA regulations.
The present document is part 2, sub-part 2 of a multi-part deliverable covering Transport and Traffic Telematics (TTT);
Dedicated Short Range Communication (DSRC) transmission equipment (500 kbit/s / 250 kbit/s) operating in the
5 795 MHz to 5 815 MHz frequency band, as identified below:
Part 1: "General characteristics and test methods for Road Side Units (RSU) and On-Board Units (OBU)";
Part 2: "Harmonised Standard for access to radio spectrum";
Sub-part 1: "Road Side Units (RSU)";
Sub-part 2: "On-Board Units (OBU)".

National transposition dates
Date of adoption of this EN: 17 June 2019
Date of latest announcement of this EN (doa): 30 September 2019
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 March 2020
Date of withdrawal of any conflicting National Standard (dow): 31 March 2021

ETSI
7 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

ETSI
8 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
1 Scope
The present document specifies technical characteristics and methods of measurements for Transport and Traffic
Telematics (TTT) systems:
• with a Radio Frequency (RF) output connection and specified antenna or with an integral antenna;
• for data transmission only;
• operating in the 5 795 MHz to 5 815 MHz frequency band.
The applicability of the present document covers only the On Board Units (OBU).
The present document complies with the Commission Implementing Decision 2017/1483/EU [i.4] and CEPT/ERC
Recommendation 70-03 [i.6].
The present document applies to the following radio equipment types operating in all or in part of the following service
frequency bands given in table 1.
Table 1: Frequency bands and centre frequencies f allocated for DSRC
Tx
Pan European Service Frequencies National Service Frequencies
Channel 1 5,795 GHz to 5,800 GHz, f = 5,7975 GHz
Tx
Channel 2 5,800 GHz to 5,805 GHz, f = 5,8025 GHz
Tx
Channel 3 5,805 GHz to 5,810 GHz, f = 5,8075 GHz
Tx
Channel 4 5,810 GHz to 5,815 GHz, f = 5,8125 GHz
Tx
NOTE: The relationship between the present document and essential requirements of article 3.2 of
Directive 2014/53/EU [i.2] is given in annex A.
2 References
2.1 Normative references
References are specific, identified by date of publication and/or edition number or version number. Only the cited
version applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] CEN EN 12253 (2004): "Road transport and traffic telematics - Dedicated short-range
communication - Physical layer using microwave at 5,8 GHz".
[2] ISO 14906 (2018): "Electronic fee collection -- Application interface definition for dedicated
short-range communication".
[3] CEPT/ERC Recommendation 74-01E (2011): "Unwanted emissions in the spurious domain".
[4] CEN EN 13372 (2004): "Road Transport and Traffic Telematics (RTTT) - Dedicated short-range
communication - Profiles for RTTT applications".
ETSI
9 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI TS 103 052 (V1.1.1) (03-2011): "Electromagnetic compatibility and Radio spectrum Matters
(ERM); Radiated measurement methods and general arrangements for test sites up to 100 GHz".
[i.2] Directive 2014/53/EU of the European Parliament and of the Council of 16 April 2014 on the
harmonisation of the laws of the Member States relating to the making available on the market of
radio equipment and repealing Directive 1999/5/EC.
[i.3] Commission Implementing Decision C(2015) 5376 final of 4.8.2015 on a standardisation request
to the European Committee for Electrotechnical Standardisation and to the European
Telecommunications Standards Institute as regards radio equipment in support of Directive
2014/53/EU of the European Parliament and of the Council.
[i.4] Commission Implementing Decision (EU) 2017/1483 of 8 August 2017 amending Decision
2006/771/EC on harmonisation of the radio spectrum for use by short-range devices and repealing
Decision 2006/804/EC" .
[i.5] Void.
[i.6] CEPT/ERC Recommendation 70-03 (May 2018): "Relating to the use of Short Range Devices
(SRD)".
[i.7] ETSI TR 102 273-2 (V1.2.1) (12-2001): "Electromagnetic compatibility and Radio spectrum
Matters (ERM); Improvement on Radiated Methods of Measurement (using test site) and
evaluation of the corresponding measurement uncertainties; Part 2: Anechoic chamber".
[i.8] ETSI TR 102 273-6 (V1.2.1) (12-2001): "Electromagnetic compatibility and Radio spectrum
Matters (ERM); Improvement on Radiated Methods of Measurement (using test site) and
evaluation of the corresponding measurement uncertainties; Part 6: Test fixtures".
[i.9] IEC 60721-3-4 (1995) including Amendment 1 (1996): "Classification of environmental
conditions - Part 3: Classification of groups of environmental parameters and their severities -
Section 4: Stationary use at non-weather protected locations".
[i.10] IEC 60721-3-5 (1997): "Classification of environmental conditions - Part 3: Classification of
groups of environmental parameters and their severities - Section 5: Ground vehicle installations".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the terms given in Directive 2014/53/EU [i.2] and the following apply:
adjacent channel: channel at a distance of 5 MHz relative to the centre frequency, i.e. in the channel at the next upper
or lower centre frequency within the frequency band allocated for DSRC (see table 3)
bit: acronym for "binary digit" which can have one out of two possible values
EXAMPLE: 0/1, or +1/-1, or low/high.
bit rate: in a bit stream, the number of bits occurring per unit time, usually expressed in bits per second
ETSI
10 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
boresight: direction of maximum radiation of a directional antenna
NOTE: If boresight cannot be determined unambiguously, then boresight may be declared by the manufacturer.
carrier frequency: frequency f to which the RSU transmitter is tuned
Tx
NOTE: In DSRC, the carrier frequency is in the centre of a channel, see table 3 of the present document.
carrier signal or carrier: harmonic signal whose nominal single frequency f can vary within a range specified by the
Tx
carrier frequency tolerance and which is capable of being modulated by a second, symbol-carrying signal
channel: continuous part of the radio-frequency spectrum to be used for a specified emission or transmission
NOTE: A radio-frequency channel may be defined by two specified limits, or by its centre frequency and its
bandwidth, or any equivalent indication. It is often designated by a sequential number. A radio-frequency
channel may be time-shared in order to allow radio communication in both directions by simplex
operation. The term "channel" is sometimes used to denote two associated radio-frequency channels, each
of which is used for one of two directions of transmission, i.e. in fact a telecommunication circuit.
co-channel: transmission using the same channel (frequency band of 5 MHz width)
cross-polar discrimination (XPD): the ratio P / P of power P of the left hand circular polarized wave to
LHCP RHCP LHCP
the power P of the right hand circular wave when the total power of the transmitted wave is P + P
RHCP LHCP RHCP
downlink: transmission in direction from RSU to OBU
ellipticity of polarization: ratio of the polarization main axes of an elliptic polarized radio wave
EXAMPLE: The ellipticity of circular polarized radio waves is one.
The ellipticity of linear polarized waves is infinity.
environmental profile: range of environmental conditions
equivalent isotropically radiated power: signal power fed into an ideal loss-less antenna radiating equally in all
directions that generates the same power flux at a reference distance as the one generated by a signal fed into the
antenna under consideration in a predefined direction within its far field region
integral antenna: antenna, with or without a connector, designed as an indispensable part of the equipment
OBU sleep mode: optional mode for battery powered OBUs that allows to save battery power
NOTE: In this mode, the OBU can only detect the presence of a DSRC downlink signal to initiate under certain
defined conditions a transition to the stand-by mode.
OBU stand-by mode: mode, in which the OBU is capable of receiving DSRC downlink signals, but is never
transmitting
operating frequency: nominal frequency at which equipment is operated; also referred to as the operating centre
frequency
NOTE: Equipment may be able to operate at more than one operating frequency.
out-of-band emissions: emissions on a frequency or frequencies immediately outside the necessary bandwidth which
results from the modulation process and which cannot be reduced without affecting the corresponding transmission of
information, but excluding spurious emissions (see also CEPT/ERC Recommendation 74-01E [3])
polarization: locus of the tip of the electrical field vector in a plane perpendicular to the direction of transmission
EXAMPLE: Horizontal and vertical linear polarization
Left and right hand circular polarization.
Portable Equipment (PE): generally intended to be self-contained, free standing and portable
NOTE: A PE would normally consist of a single module, but may consist of several interconnected modules. It is
powered by one or more internal batteries.
ETSI
11 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
radiated measurements: measurements which involve the measurement of a radiated electromagnetic field
spurious emissions: emission on a frequency, or frequencies, which are outside an exclusion band of ±2,5 times the
channel spacing around the selected centre frequency f , and the level of which may be reduced without affecting the
Tx
corresponding transmission of information
NOTE: Spurious emissions include harmonic emissions, parasitic emissions, intermodulation products and
frequency conversion products but exclude out-of-band emissions (see also CEPT/ERC
Recommendation 74-01E [3]).
uplink: transmission in direction from OBU to RSU
3.2 Symbols
For the purposes of the present document, the following symbols apply:
A Amplitude of CW signal
CW
A Amplitude of modulated signal
mod
ATN Attenuation of attenuator AT2
AT2
ATN Attenuation of balun BLN
BLN
ATN Attenuation of coaxial cable 1
CA1
BER Bit error ratio
C Number of frames transmitted
F
C Number of erroneous frames received
E
d Distance between phase centres of transmitting and receiving antenna
d Horizontal displacement of TTA and RTA antenna phase centres
displace
d Distance from transmitting antenna to first Fresnel ellipse
F1
d Distance from first Fresnel ellipse to receiving antenna
F2
D Distance between neighbouring ferrite beads
fb
D Directivity relative to an isotropic radiator
i
Largest linear dimension of test antenna
D
0,TA
D Largest linear dimension of EUT antenna
0,EUT
EIRP Maximum e.i.r.p. of RSU
max
EIRP Maximum e.i.r.p. generated by the OBU in a single side band
MaxObuTx
EIRP e.i.r.p. generated by the OBU within a single side band
ObuTx
EIRP e.i.r.p. generated by the OBU antenna
OBU
EIRP e.i.r.p. referred to transmitter spectrum mask
TSM
Δf Frequency error of RSU
RSU
Δf Sub-carrier frequency error
s
f Frequency
f Centre frequency of receiving device or of MSS2 used for calibration
c
FER Frame error ratio
f Actual centre frequency of the lower and upper side band of the OBU uplink channel
ObuTx
f Frequency of MSS1
MSS1
f Offset frequency
offset
f Nominal OBU sub-carrier frequency
s
f Nominal RSU carrier frequency
Tx
f Actual centre frequency of the downlink carrier
Tx,actual
f Nominal centre frequency of unwanted signal
u
f , f Centre frequencies of unwanted signal
u1 u2
G Conversion gain
c
G Correction gain
corr
G Gain of OBU receiving antenna
OBU,Rx
G Gain of OBU transmitting antenna
OBU,Tx
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12 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
G Gain of receiving substitution antenna
RSA
G Gain of test antenna
TA
G Gain of transmitting substitution antenna
TSA
G Gain of RSU transmitting antenna
RSU,Tx
k Expansion factor (coverage factor)
lg(.) Logarithm to the base ten
m Modulation index
Mc Location of the OBU antenna phase centre
N Total number of transmitted bits within a single frame
P Power of CW signal
CW
P Power limit for communication (upper)
D11a
P Power limit for communication (lower)
D11b
P Incident signal power as received by an ideal isotropical receiving antenna
inc
Incident signal power obtained from a scanning process
P
inc,scan
P P in dBm
inc,dBm inc
P Signal power of left hand circular polarized wave
LHCP
P Maximum signal power
max
P Power of modulated signal
mod
P Output signal power of MSS1
MMS1
P Output signal power of MSS2
MMS2
P Incident signal power to OBU, referred to an ideal isotropical receiving antenna
ObuRx
P Signal power of wave with corresponding polarization
pol
P Signal power of wave featuring vertical polarization
v
P Signal power of wave featuring horizontal polarization
h
P Signal power measured by the power meter 1
PM1
P Reference signal power limit in Watt
ref
P Reference signal power limit in dBm
ref,dBm
P Retransmitted signal power
reTx
P Signal power obtained from receiving substitution antenna
RSA
P Signal power of right hand circular polarized wave
RHCP
P Signal power within single side band
ssb
P Sensitivity of receiver
sens
P Signal power of spurious signal
spurious
P Sum of signal power P + P , or P + P + . + P , whichever applies
tot 1 2 1 2 5
P P in dBm
tot,dBm tot
P Transmitter spectrum mask
TSM
P Power of unwanted signal at OBU antenna
u
P Unwanted signal power limit at OBU antenna
u max
P Signal power of wanted signal
w
P Reference signal power of 1 mW corresponding to 0 dBm
RBW Resolution bandwidth
T Duration of CW signal
CW
T Duration of modulated signal
mod
V , V Maximal amplitude of modulated output signal of RSU caused by data bit 1, or 0
max min
α Tilt angle of test antenna
α Displacement angle between TTA and RTA
displace
θ Angle relative to OBU boresight indicating worst case direction

θ° Value of θ measured in degree
Wavelength
λ
ρ Reflection coefficient at antenna connector of the receiving substitution antenna
RSA
ρ Reflection coefficient at antenna connector of the transmitting substitution antenna
TSA
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13 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
3.3 Abbreviations
For the purposes of the present document the abbreviations given in CEN EN 12253 [1] and the following apply:
ASG Arbitrary Signal Generator
AT1 ATtenuator 1
AT2 ATtenuator 2
BER Bit Error Ratio
BLN BaLuN
BST Beacon Service Table
CA Corresponding Antenna
CC Coaxial Circulator
CRC Cyclic Redundancy Checking
CW Continuous Wave
DSRC Dedicated Short Range Communication
e.i.r.p. equivalent isotropically radiated power
NOTE: Also called EIRP, eirp, E.I.R.P.
EC European Community
EUT Equipment Under Test
FCCA Ferrited Coaxial CAble
FCCA1 Ferrited Coaxial CAble 1
FER Frame Error Ratio
LHCP Left Hand Circular Polarized
LOS Line-Of-Sight
LP Linear Polarized
M Centre point between phase centres of TTA and RTA
centre
MSS1 Monochromatic Signal Source 1
MSS2 Monochromatic Signal Source 2
n.a. not applicable
OBU On Board Unit
PE Portable Equipment
PM1 Power Meter 1
RBW Resolution BandWidth
RD Receiving Device
RF Radio Frequency
RRxA RSU Receiving Antenna
RSA Receiving Substitution Antenna
RSU Road Side Unit
RTA Receiving Test Antenna
RTTT Road Transport and Traffic Telematics
RTxA RSU Transmitting Antenna
Rx Receiver
SMS1 Signal or Message Source 1
SR Special Report
SSB Single Side Band
TA Test Antenna
TM1 Test Message 1
TS1 Test Signal 1
TS2 Test Signal 2
TSA Transmitting Substitution Antenna
TSM Transmitter Spectrum Mask
TTA Transmitting Test Antenna
Tx Transmitter
VBW Video Band Width
VST Vehicle Service Table
VSWR Voltage Standing Wave Ratio
XP Cross Polarized
XPD Cross-Polar Discrimination
ETSI
14 ETSI EN 300 674-2-2 V2.2.1 (2019-06)
4 Technical requirements specifications
4.1 General characteristics
4.1.1 OBU sets
There exist two sets of OBUs called Set A and Set B which differ by the parameters in table 2 either in terms of value or
applicability, and which are defined in CEN EN 13372 [4].
Table 2: Differences in OBU Sets
CEN EN 12253 [1] Set A Set B
parameter abbreviation
D11a Power limit for communication (upper): See table 12
D12 n.a. Cut off power level of OBU: -60 dBm
U4a Maximum SSB e.i.r.p. (boresight): See table 5
U4b n.a. Maximum SSB e.i.r.p.: See table 5
U12b n.a. Conversion gain (upper limit): 10 dB for each side band

The manufacturer shall declare which Set the unit complies with.
4.1.2 Uplink sub-carrier frequencies
The sub-carrier signal or sub-carrier is a signal whose nominal single frequency f can vary within a range specified by
s
the sub-carrier frequency tolerance and which shall be capable of being modulated by a second, symbol-carrying signal,
see clause 4.1.4.
The uplink sub-carrier frequency is referred to as parameter U1 in CEN EN 12253 [1].
Every DSRC OBU shall support the two sub-carrier frequencies f of 1,5 MHz and 2,0 MHz.
s
4.1.3 Carrier frequencies
According to parameter D3 in CEN EN 12253 [1] every OBU shall be able to operate in all DSRC channels as indicated
in table 3.
defined for channel 1
For tests of OBU parameters described in the present document, only the carrier frequencies f
Tx
and channel 4 in table 3 shall be considered.
Table 3: Frequency bands and centre frequencies f allocated for DSRC
Tx
Pan European Service Frequencies National Service Frequencies
Channel 1 5,795 GHz to 5,800 GHz, f = 5,7975 GHz n.a.
Tx
Channel 2 5,800 GHz to 5,805 GHz, f = 5,8025 GHz n.a.
Tx
Channel 3 n.a. 5,805 GHz to 5,810 GHz, f = 5,8075 GHz
Tx
Channel 4 n.a. 5,810 GHz to 5,815 GHz, f = 5,8125 GHz
Tx
4.1.4 Modulation
The uplink sub-carrier (see clause 4.1.2) shall be modulated
...