SIST EN 300 674-1 V1.2.1:2006

• Abstract:

  The present document applies to Road Transport and Traffic Telematics (RTTT) wireless systems:; - with or without antenna connectors;; - for digital data transmission;; - operating on radio frequencies in the 5,725 GHz to 5,875 GHz Industrial, Scientific and Medical (ISM) frequency band.; The applicability of the present document covers both the Road Side Units (RSUs) and the On-Board Units (OBUs) with transceivers and transponders. The present document complies with ECC/DEC/(02)01 [1] and CEPT/ERC/REC 70-03 [3]. It is a specific standard covering various RTTT applications. Additional standards or specifications may be required for equipment such as that intended for connection to the Public Switched Telephone Network (PSTN) or other systems.

• Status: Published
• Publication Date: 28-Feb-2006
• ICS: 33.060.99 - Other equipment for radiocommunications
• ICS: 33.100.01 - Electromagnetic compatibility in general
• ICS: 35.240.60 - IT applications in transport
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Mar-2006
• Due Date: 01-Mar-2006
• Completion Date: 01-Mar-2006
• Directive: 2005-01-1864 - Pravilnik o radijskih frekvencah, ki se smejo uporabljati brez odločbe o dodelitvi radijskih frekvenc
• Mandate: M/270
• Mandate: M/338
• Ref Project: ETSI EN 300 674-1 V1.2.1 (2004-02) - Electromagnetic compatibility and Radio spectrum Matters (ERM); Road Transport and Traffic Telematics (RTTT); Dedicated Short Range Communication (DSRC) transmission equipment (500 kbit/s / 250 kbit/s) operating in the 5,8 GHz Industrial, Scientific and Medical (ISM) band; Part 1: General characteristics and test methods for Road Side Units (RSU) and On-Board Units (OBU)

SIST EN 300 674-1 V1.2.1:2006 is the Slovenian publication of ETSI EN 300 674-1 V1.2.1, a European standard from ETSI for electromagnetic compatibility and radio spectrum matters in Road Transport and Traffic Telematics (RTTT). It specifies the general characteristics, test methods, and measurement limits for Dedicated Short Range Communication (DSRC) transmission equipment operating in the 5,725 GHz to 5,875 GHz Industrial, Scientific and Medical (ISM) band, for Road Side Units (RSU) and On-Board Units (OBU).

What does SIST EN 300 674-1 V1.2.1:2006 specify?

SIST EN 300 674-1 V1.2.1:2006 specifies the general characteristics and test methods for DSRC equipment used in RTTT systems. The document applies to equipment with or without antenna connectors, for digital data transmission, and it covers both RSU and OBU transceivers and transponders.

The document is organized into clauses for scope, references, definitions, general characteristics, RSU characteristics, OBU characteristics, parameter limits, test basics, RSU testing, OBU testing, and interpretation of results and measurement uncertainty. The core technical content is supported by tables and figures that define channels, limits, test signals, measurement arrangements, and uncertainty values.

The scope also states that the document aligns with ECC/DEC/(02)01 and CEPT/ERC/REC 70-03, and that other standards or specifications may be needed for equipment connected to the Public Switched Telephone Network (PSTN) or other systems.

What are the key requirements of SIST EN 300 674-1 V1.2.1:2006?

Equipment definition and declared variants

SIST EN 300 674-1 V1.2.1:2006 requires the provider to declare the applicable RSU class and OBU set. RSUs are grouped into classes A, B, and C, based on the in-band spurious emissions parameter from EN 12253, and the document notes that class A is not recommended for new equipment.

OBUs are divided into Set A and Set B, with differences in which EN 12253 parameters apply. The provider also declares the physical assembly of the OBU, such as a removable unit, a unit bonded by an authorized service station, or an integral part of another vehicle component. In practice, this means the test sample must be described in the same form as it is placed on the market.

Radio channels, antennas, and modulation

RSUs operate in the channels listed in the document, with centre frequencies in the 5.8 GHz band. If equipment can be adjusted to other operating frequencies, tests must cover at least the lower and higher limits of the declared operating range. RSU antennas shall be left-hand circular polarized (LHCP), and RSU carrier modulation shall follow the EN 12253 down-link parameters.

OBUs shall support the two up-link sub-carrier frequencies of 1,5 MHz and 2,0 MHz, and shall be able to operate in all DSRC channels. OBU antennas shall also be LHCP. The document also defines the OBU antenna cone angle used in tests, with a 35° angle required for certain measurements.

Performance limits and emission controls

Clause 7 sets the main limits for RSU and OBU behavior. For RSUs, the document covers modulation index, dynamic range, sensitivity, error behavior at high wanted input signals, intermodulation immunity, co-channel rejection, blocking, selectivity, maximum equivalent isotropically radiated power, frequency error, transmitter spectrum mask, transmitter unwanted emissions, and receiver spurious emissions.

For OBUs, the document covers dynamic range, sensitivity, upper power limit for communication, cut-off power level, conversion gain, maximum equivalent isotropically radiated power, frequency error, transmitter spectrum mask, transmitter unwanted emissions, and receiver spurious emissions. These items matter because they define the radio performance that must be demonstrated before the equipment can be accepted for use.

The RSU transmitter spectrum mask depends on the class and on the frequency offset from the carrier. The table in the standard gives the limit structure for co-channel and adjacent-channel measurements. In practice, this is the part that controls how much energy may appear near the wanted channel and in nearby channels.

Testing methods and measurement practice

Clause 8 defines the test basics. Measurements may be conducted or radiated, and the standard gives arrangements for one or two antenna connectors, shielded anechoic chambers, open area test sites, and test fixtures. It also defines the RF cable characteristics used in the setups, including 50 Ω impedance, low VSWR, and high shielding loss.

The document uses defined test signals and messages. TM1 supports initialization and ECHO command testing, TS1 is a coded DSRC signal with a repeated pseudo-random sequence, and TS2 is a continuous up-link signal with an unmodulated sub-carrier. These standardized signals make results comparable between laboratories.

Result interpretation and uncertainty

Clause 11 uses a shared-risk approach for interpreting results. The measured value is compared with the limit, and the test report must include measurement uncertainty. The uncertainty figures are tied to TR 100 028 and use an expansion factor k = 1,96 for a 95% confidence level.

The document also gives maximum acceptable uncertainty values for conducted RF power, radiated emissions, sensitivity, frequency, temperature, humidity, and two- and three-signal measurements. This matters because a result is only meaningful if the measurement system is accurate enough for the parameter being checked.

What terms does SIST EN 300 674-1 V1.2.1:2006 define?

• DSRC (Dedicated Short Range Communication) - The short-range radio link used here for RTTT applications, including the down-link from RSU to OBU and the up-link from OBU to RSU.
• RSU (Road Side Unit) - The roadside equipment that transmits and receives DSRC signals and is tested for transmitter and receiver performance.
• OBU (On Board Unit) - The vehicle-mounted equipment that receives RSU signals and retransmits on the DSRC up-link.
• EIRP (Equivalent Isotropically Radiated Power) - The radiated power expressed as if the antenna were ideal and isotropic, used to compare measured output against emission limits.
• BER (Bit Error Ratio) - The ratio used to judge reception quality in several receiver tests.
• FER (Frame Error Ratio) - A frame-based error measure used in the reception tests.
• LHCP (Left Hand Circular Polarized) - The required antenna polarization for RSU and OBU equipment in this standard.
• TSM (Transmitter Spectrum Mask) - The emission shape around the carrier that defines permitted power at offset frequencies.

Who uses SIST EN 300 674-1 V1.2.1:2006?

SIST EN 300 674-1 V1.2.1:2006 is used by manufacturers of DSRC RSU and OBU equipment, by test laboratories that verify radio performance, and by quality and compliance teams that prepare declarations and test reports. It is also relevant to buyers and system integrators in road tolling, electronic fee collection, and other RTTT applications where DSRC links are used.

The document is especially useful when a team must decide how to classify an RSU, which OBU set applies, what antenna arrangement is in scope, and which measurement method to use for sensitivity, spectrum mask, emissions, or e.i.r.p. checks.

What changed in SIST EN 300 674-1 V1.2.1:2006 from the previous edition?

The history shows earlier V1.1.1 publications for ES 200 674-1 and EN 300 674, followed by the V1.2.1 publication of this standard. The document itself is the V1.2.1 edition.

Which standards are used with SIST EN 300 674-1 V1.2.1:2006?

• ECC/DEC/(02)01 - Sets the frequency-bands decision referenced by the scope for coordinated introduction of RTTT systems.
• CEPT/ERC/REC 70-03 - Provides the short-range device framework referenced by the scope.
• EN 12253 - Supplies the DSRC physical-layer parameters used throughout the document, including channel, modulation, antenna, and power-related abbreviations.
• EN 12795 and EN 12834 - Provide DSRC data link and application-layer context for TM1 test messages.
• ISO/TR 14906 - Provides the EFC application interface context for DSRC-related test messages.
• TR 100 028 - Defines the approach used for measurement uncertainty and shared-risk interpretation.
• TR 102 273-2, TR 102 273-4, and TR 102 273-6 - Support uncertainty and verification practices for anechoic chambers, open area test sites, and test fixtures.
• EN 13372 - Defines the OBU set distinctions used in the document.
• IEC 60721-3-4 and IEC 60721-3-5 - Support the environmental condition classifications used for stationary locations and ground vehicle installations.
• CISPR 16-1 - Provides radio disturbance and immunity measuring apparatus and methods used in the measurement context.

What does the SIST EN 300 674-1 V1.2.1:2006 document contain?

The document contains channel tables, class distinctions, and test limits for RSU and OBU radio performance. It also includes measurement arrangements for conducted and radiated testing, including shielded anechoic chamber setups, open area test site guidance, and fixture-based methods.

Several figures support the test methods, including antenna geometry, RSU and OBU measurement arrangements, and turntable positions for emission tests. The formulas and procedures cover power calculations, conversion gain, e.i.r.p., transmitter spectrum mask evaluation, and BER/FER-based receiver checks.

It also gives specific test signals and measurement bandwidth settings, plus the uncertainty limits that apply to each type of measurement. In practice, this is the part of the standard that laboratories use to set up the test bench, choose the right signal, and record results in a form that can be compared with the limits in clause 7.

SLOVENSKI STANDARD
01-marec-2006
Elektromagnetna združljivost in zadeve v zvezi z radijskim spektrom (ERM) –
Cestna transportna in prometna telematika (RTTT) – Oddajniška oprema za
enouporabniško (osebno) komunikacijo kratkega dosega (DSRC) (s prenosnima
hitrostma 500 kbit/s / 250 kbit/s), ki deluje v pasu 5,8 GHz, namenjenem
industrijski, znanstveni in medicinski uporabi – 1. del: Splošne karakteristike in
preskusne metode za obcestne enote (RSU) in enote na vozilu (OBU)
Electromagnetic compatibility and Radio spectrum Matters (ERM); Road Transport and
Traffic Telematics (RTTT); Dedicated Short Range Communication (DSRC) transmission
equipment (500 kbit/s / 250 kbit/s) operating in the 5,8 GHz Industrial, Scientific and
Medical (ISM) band; Part 1: General characteristics and test methods for Road Side
Units (RSU) and On-Board Units (OBU)
Ta slovenski standard je istoveten z: EN 300 674-1 Version 1.2.1
ICS:
33.060.99 Druga oprema za radijske Other equipment for
komunikacije radiocommunications
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
35.240.60 Uporabniške rešitve IT v IT applications in transport
transportu in trgovini and trade
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

ETSI EN 300 674-1 V1.2.1 (2004-08)
European Standard (Telecommunications series)

Electromagnetic compatibility
and Radio spectrum Matters (ERM);
Road Transport and Traffic Telematics (RTTT);
Dedicated Short Range Communication (DSRC)
transmission equipment (500 kbit/s / 250 kbit/s) operating in
the 5,8 GHz Industrial, Scientific and Medical (ISM) band;
Part 1: General characteristics and test methods
for Road Side Units (RSU) and On-Board Units (OBU)

2 ETSI EN 300 674-1 V1.2.1 (2004-08)

Reference
REN/ERM-TG29-0105
Keywords
data, DSRC, radio, RTTT, testing
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© European Telecommunications Standards Institute 2004.
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ETSI
3 ETSI EN 300 674-1 V1.2.1 (2004-08)
Contents
Intellectual Property Rights.7
Foreword.7
1 Scope.8
2 References.8
3 Definitions, symbols and abbreviations .9
3.1 Definitions.9
3.2 Symbols.10
3.3 Abbreviations.12
4 General characteristics.14
4.1 Mechanical and electrical design.14
4.1.1 Units.14
4.1.2 Controls.14
4.2 Environmental profiles.15
4.2.1 Summary.15
4.2.2 Environmental profile declared by provider .15
4.2.3 Voluntary ETSI environmental profile .15
4.2.3.1 Normal environmental conditions.15
4.2.3.2 Extreme environmental conditions.15
5 General characteristics of Road Side Unit.16
5.1 RSU classes.16
5.2 Power supply.16
5.3 Carrier frequencies.16
5.4 Antenna characteristic.16
5.5 Modulation.16
6 General characteristics of On Board Unit .17
6.1 OBU sets.17
6.2 OBU assemblies.17
6.3 Power supply.17
6.4 Up-link sub-carrier frequencies.17
6.5 Antenna characteristic.18
6.6 Carrier frequencies.18
6.7 Modulation.18
7 Parameter description and required limits.19
7.1 RSU.19
7.1.1 Modulation index.19
7.1.2 Dynamic range.19
7.1.2.1 Definition.19
7.1.2.2 Sensitivity.20
7.1.2.3 Error behaviour at high wanted input signals.20
7.1.3 Intermodulation immunity.20
7.1.4 Co-channel rejection.20
7.1.5 Blocking.20
7.1.6 Selectivity.21
7.1.7 Maximum equivalent isotropically radiated power.21
7.1.8 Frequency error.21
7.1.9 Transmitter spectrum mask.21
7.1.10 Transmitter unwanted emissions.22
7.1.11 Receiver Spurious emissions .22
7.2 OBU.23
7.2.1 Dynamic range.23
7.2.1.1 Definition.23
7.2.1.2 Sensitivity.23
ETSI
4 ETSI EN 300 674-1 V1.2.1 (2004-08)
7.2.1.3 Upper power limit for communication.23
7.2.2 Cut-off power level.23
7.2.3 Conversion gain.23
7.2.4 Maximum equivalent isotropically radiated power.24
7.2.5 Frequency error.24
7.2.6 Transmitter spectrum mask.24
7.2.7 Transmitter unwanted emissions.25
7.2.8 Receiver spurious emissions.25
8 Basics on testing.25
8.1 General conditions.25
8.1.1 Environment.25
8.1.2 Power source.25
8.1.3 Thermal balance.26
8.2 Test signals.26
8.3 Test sites.27
8.3.1 Shielded anechoic chamber.27
8.3.2 Open area test site.28
8.3.3 Test fixture.29
8.4 General requirements for RF cables .30
8.5 Conducted measurements.31
8.5.1 One antenna connector arrangement.31
8.5.2 Two antenna connectors arrangement.32
8.5.3 Test site requirements .32
8.5.4 Site preparation.32
8.5.4.1 Monochromatic signals.32
8.5.4.2 Modulated signals.33
8.6 Radiated measurements.33
8.6.1 One antenna arrangement .33
8.6.2 Two antennas arrangement .35
8.6.3 Test site requirements .36
8.6.3.1 Measurement distances.36
8.6.3.2 Free-space wave propagation.36
8.6.4 Test and substitution antennas .37
8.6.5 Site preparation for OBU measurements .37
8.6.5.1 Monochromatic signals.37
8.6.5.2 Modulated signals.39
8.6.6 Site preparation for RSU measurements.40
8.6.6.1 Arrangement for transmit parameters.40
8.6.6.2 Arrangement for receive parameters .41
8.7 Instruments.42
8.7.1 Receiving device.42
8.7.2 RF power sensor .43
8.7.3 Combiner.43
8.8 Power of modulated RSU carrier .44
8.9 Bit error ratio measurements .45
8.9.1 Basics.45
8.9.2 BER measurement.45
8.9.3 FER measurement.45
8.9.3.1 Mathematical expressions.45
8.9.3.2 Equipment.45
8.9.3.3 Procedure.46
9 Testing of Road Side Unit.46
9.1 Modulation index.46
9.1.1 General.46
9.1.2 Radiated measurements.46
9.1.3 Conducted measurements.47
9.2 Dynamic range.47
9.2.1 Sensitivity.47
9.2.1.1 General.47
9.2.1.2 Radiated measurements.48
ETSI
5 ETSI EN 300 674-1 V1.2.1 (2004-08)
9.2.2 Error behaviour at high wanted input signals .48
9.2.2.1 General.48
9.2.2.2 Radiated measurements.48
9.3 Intermodulation immunity.49
9.3.1 General.49
9.3.2 Radiated measurements.49
9.4 Co-channel rejection.50
9.4.1 General.50
9.4.2 Radiated measurements.50
9.5 Blocking.51
9.5.1 General.51
9.5.2 Radiated measurements.51
9.6 Selectivity.52
9.6.1 General.52
9.6.2 Radiated measurements.52
9.7 Maximum equivalent isotropically radiated power .52
9.7.1 General.52
9.7.2 Radiated measurements.52
9.7.3 Conducted measurements.53
9.8 Frequency error.53
9.8.1 General.53
9.8.2 Radiated measurements.54
9.8.3 Conducted measurements.54
9.9 Transmitter spectrum mask.54
9.9.1 General.54
9.9.2 Radiated measurements.55
9.9.3 Conducted measurements.56
9.10 Transmitter unwanted emissions .58
9.10.1 General.58
9.10.2 Radiated measurements.58
9.11 Receiver spurious emissions.59
9.11.1 General.59
9.11.2 Radiated measurements.60
10 Testing of On Board Unit.60
10.1 Dynamic range.60
10.1.1 Sensitivity.60
10.1.1.1 General.60
10.1.1.2 Radiated measurements.60
10.1.1.3 Conducted measurements.61
10.1.2 Upper power limit for communication.61
10.1.2.1 General.61
10.1.2.2 Radiated measurements.62
10.1.2.3 Conducted measurements.62
10.2 Cut-off power level .63
10.2.1 General.63
10.2.2 Radiated measurements.63
10.2.3 Conducted measurements.63
10.3 Conversion gain.64
10.3.1 General.64
10.3.2 Radiated measurement.64
10.3.3 Conducted measurement.65
10.4 Maximum equivalent isotropically radiated power .66
10.4.1 General.66
10.4.2 Radiated measurement.66
10.4.3 Conducted measurement.67
10.5 Frequency error.68
10.5.1 General.68
10.5.2 Radiated measurements.68
10.5.3 Conducted measurements.69
10.6 Transmitter spectrum mask.69
10.6.1 General.69
ETSI
6 ETSI EN 300 674-1 V1.2.1 (2004-08)
10.6.2 Radiated measurements.69
10.6.3 Conducted measurements.71
10.7 Transmitter unwanted emissions .73
10.7.1 General.73
10.7.2 Radiated measurement.74
10.8 Receiver spurious emissions.76
10.8.1 General.76
10.8.2 Radiated measurement.76
11 Interpretation of results and measurement uncertainty .76
11.1 Interpretation of results .76
11.2 Measurement uncertainty.76
History .78

ETSI
7 ETSI EN 300 674-1 V1.2.1 (2004-08)
Intellectual Property Rights
IPRs essential or potentially essential to the present document 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 (http://webapp.etsi.org/IPR/home.asp).
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.
Foreword
This European Standard (Telecommunications series) has been produced by ETSI Technical Committee
Electromagnetic compatibility and Radio spectrum Matters (ERM).
The present document is part 1 of a multi-part deliverable covering Electromagnetic compatibility and Radio spectrum
Matters (ERM); Road Transport and Traffic Telematics (RTTT); Dedicated Short Range Communication (DSRC)
transmission equipment (500 kbit/s / 250 kbit/s) operating in the 5,8 GHz Industrial, Scientific and Medical (ISM) band,
as identified below:
Part 1: "General characteristics and test methods for Road Side Units (RSU) and On-Board Units (OBU)";
Part 2: "Harmonized EN under article 3.2 of the R&TTE Directive".

National transposition dates
Date of adoption of this EN: 2 April 2004
Date of latest announcement of this EN (doa): 31 July 2004
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 January 2005
Date of withdrawal of any conflicting National Standard (dow): 31 January 2005

ETSI
8 ETSI EN 300 674-1 V1.2.1 (2004-08)
1 Scope
The present document applies to Road Transport and Traffic Telematics (RTTT) wireless systems:
- with or without antenna connectors;
- for digital data transmission;
- operating on radio frequencies in the 5,725 GHz to 5,875 GHz Industrial, Scientific and Medical (ISM)
frequency band.
The applicability of the present document covers both the Road Side Units (RSUs) and the On-Board Units (OBUs)
with transceivers and transponders.
The present document complies with ECC/DEC/(02)01 [1] and CEPT/ERC/REC 70-03 [3]. It is a specific standard
covering various RTTT applications.
Additional standards or specifications may be required for equipment such as that intended for connection to the Public
Switched Telephone Network (PSTN) or other systems.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
[1] ECC/DEC/(02)01: "ECC Decision of 15 March 2002 on the frequency bands to be designated for
the coordinated introduction of Road Transport and Traffic Telematic Systems".
[2] CENELEC EN 12253 (2003): "Road transport and traffic telematics. Dedicated short-range
communication. Physical layer using microwave at 5,8 GHz".
[3] CEPT/ERC/REC 70-03: "Relating to the use of Short Range Devices (SRD)".
[4] ETSI TR 100 028 (V1.4.1 - all parts): "Electromagnetic compatibility and Radio spectrum Matters
(ERM); Uncertainties in the measurement of mobile radio equipment characteristics".
[5] 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".
[6] 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".
[7] BS EN 12795 (2003): "Road transport and traffic telematics. Dedicated short range
communication (DSRC). DSRC data link layer. Medium access and logical link control".
[8] BS EN 12834 (2003): "Road transport and traffic telematics. Dedicated Short Range
Communication (DSRC). DSRC application layer".
[9] ISO/TR 14906 (1998): "Road Transport and Traffic Telematics (RTTT) - Electronic Fee
Collection (EFC) - Application interface definition for dedicated short range communications".
ETSI
9 ETSI EN 300 674-1 V1.2.1 (2004-08)
[10] CEPT/ERC/REC 74-01E (2002): "Spurious Emissions".
[11] ETSI TR 102 273-2 (V1.2.1): "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".
[12] ETSI TR 102 273-4 (V1.2.1): "Electromagnetic compatibility and Radio spectrum Matters (ERM);
Improvement on Radiated Methods of Measurement (using test site) and evaluation of the
corresponding measurement uncertainties; Part 4: Open area test site".
[13] ETSI TR 102 273-6 (V1.2.1): "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".
[14] CENELEC EN 13372 (2003): "Road transport and traffic telematics (RTTT). Dedicated short-
range communication. Profiles for RTTT applications".
[15] Commission Directive 95/54/EC of 31 October 1995 adapting to technical progress Council
Directive 72/245/EEC on the approximation of the laws of the Member States relating to the
suppression of radio interference produced by spark-ignition engines fitted to motor vehicles and
amending Directive 70/156/EEC on the approximation of the laws of the Member States relating
to the type-approval of motor vehicles and their trailers.
[16] CISPR 16-1 Edition 2.1 (2002): "Specification for radio disturbance and immunity measuring
apparatus and methods - Part 1: Radio disturbance and immunity measuring apparatus".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply.
adjacent channel: A downlink adjacent channel refers to transmission in downlink direction using any one of the
adjacent DSRC downlink channels at a distance of 5 MHz, i.e. in the channel at the next upper or lower centre
frequency. An uplink adjacent channel refers to transmission in uplink direction using any one of the uplink
communication channels related to a centre frequency at a distance of 5 MHz relative to the own downlink centre
frequency.
bit: acronym for "binary digit" which can have one out of two possible values, e.g. 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
bore sight: direction of maximum radiation of a directional antenna
NOTE: If bore sight can not be determined unambiguously, then bore sight may be declared by the provider.
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 2 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 radiocommunication 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.
ETSI
10 ETSI EN 300 674-1 V1.2.1 (2004-08)
co-channel: A downlink co-channel refers to a transmission in downlink direction using the same frequency band of
5 MHz width. Up-link channels at the two sub-carrier frequencies related to the same downlink channel (downlink
centre frequency) are referred to as co-channels.
cross-polar discrimination, ellipticity of polarization: Antenna designed to transmit left hand circular waves may
transmit some right hand circular waves in addition. Cross-Polar Discrimination (XPD) is defined as the ratio
P /P of power P of the left hand circular polarized wave to the power P of the right hand circular
LHCP RHCP LHCP RHCP
wave when the total power of the transmitted wave is P + P
LHCP RHCP.
environmental profile: range of environmental conditions under which equipment within the scope of EN 300 674-1 is
required to comply with the provisions of EN 300 674-1
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: OBU may be either in sleep mode, the stand-by mode, or the transmit mode. The sleep mode is an
optional mode for battery powered OBUs that allows to save battery power. In this mode, the OBU can only detect the
presence of a DSRC down-link signal which under certain defined conditions, see EN 12253 [2], will lead to wake-up,
i.e. a transition to the stand-by mode.
OBU stand-by mode: OBU may be either in sleep mode, the stand-by mode, or the transmit mode. The stand-by mode
is the mode, in which the OBU is capable of receiving DSRC down-link signals. In this mode the OBU is never
transmittin
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