SIST EN 12253:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.NDFLMDStraßentransport- und Verkehrstelematik (RTTT) - Nahbereichskommunikation Fahrzeug-Bake (DSRC) -Bitübertragungsschicht für die Frequenz 5,8 GHzTélématique des transports routiers - Communication a courte portée véhicule/infrastructure - Couche physique utilisant les micro-ondes a 5,8 GHzRoad transport and traffic telematics - Dedicated short-range communication - Physical layer using microwave at 5,8 GHz35.240.60Uporabniške rešitve IT v transportu in trgoviniIT applications in transport and trade35.100.10Physical layerICS:Ta slovenski standard je istoveten z:EN 12253:2004SIST EN 12253:2004en01-september-2004SIST EN 12253:2004SLOVENSKI
STANDARDSIST ENV 12253:20031DGRPHãþD



SIST EN 12253:2004



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12253July 2004ICS 35.240.60Supersedes ENV 12253:1997English versionRoad transport and traffic telematics - Dedicated short-rangecommunication - Physical layer using microwave at 5,8 GHzTélématique des transports routiers - Communication àcourte portée véhicule/infrastructure - Couche physiqueutilisant les micro-ondes à 5,8 GHzStraßentransport- und Verkehrstelematik (RTTT) -Nahbereichskommunikation Fahrzeug-Bake (DSRC) -Bitübertragungsschicht für die Frequenz 5,8 GHzThis European Standard was approved by CEN on 23 April 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12253:2004: ESIST EN 12253:2004



EN 12253:2004 (E) 2 Contents page Foreword.3 Introduction.4 1 Scope.5 2 Normative references.5 3 Terms and definitions.5 3.1 General definitions.5 3.2 Downlink parameters.6 3.3 Uplink parameters.8 4 Abbreviations.10 5 DSRC link parameters.11 5.1 General.11 5.2 Downlink parameters.11 5.3 Uplink parameters.14 Annex A
(informative)
A-deviations.16 Bibliography.17
SIST EN 12253:2004



EN 12253:2004 (E) 3 Foreword This document (EN 12253:2004) has been prepared by Technical Committee CEN/TC 278 “Road Transport and Traffic Telematics”, the secretariat of which is held by NEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 2005, and conflicting national standards shall be withdrawn at the latest by January 2005. This document supersedes ENV 12253:1997 According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SIST EN 12253:2004



EN 12253:2004 (E) 4 Introduction This document replaces ENV 12253. In order to facilitate migration from European Pre-standard (ENV) to European Standard, equipment procured and installed in accordance with ENV 12253 has been considered when drafting this document. This document forms part of a series of documents defining the framework of a Dedicated Short Range Communication (DSRC) link in the Road Transport and Traffic Telematics (RTTT) environment. The communication requirements of many RTTT applications can be fulfilled by DSRC. The DSRC Standards enable compliant communication systems to serve multiple RTTT applications in parallel. The small service areas and severe real-time constraints require a specific protocol architecture leading to the reduced protocol stack shown in Figure 1, consisting of the Application Layer, the Data Link Layer, and the Physical Layer. Such an architecture is very common for real-time environments. This document deals with the physical layer of the DSRC protocol stack.
Figure 1 — DSRC protocol stack
The following set of documents for the DSRC link is issued by CEN: EN 12253 Road transport and traffic telematics - Dedicated short-range communication - Physical layer using microwave at 5,8 GHz EN 12795 Road transport and traffic telematics - Dedicated Short Range Communication (DSRC) - DSRC data link layer: medium access and logical link control EN 12834 Road transport and traffic telematics - Dedicated Short Range Communication (DSRC) - DSRC application layer EN 13372 Road transport and traffic telematics
- Dedicated short-range communication - Profiles for RTTT applications
This document comprises requirements for Open Systems Interconnection (OSI) Layer 1 at 5,8 GHz for DSRC. It does not include associated measurement procedures for verification of the requirements. Test methods for conformity are provided in ETSI EN 300674-1, ETSI EN 300674-2-1, ETSI EN 300674-2-2. This European Standard caters for on-board units based on transponder technologies. Furthermore, it allows for mixed time, frequency and space division multiple access approaches. This European Standard is conceived for the 10 MHz part, i.e. 5,795 GHz to 5,805 GHz, of the ISM band at 5,8 GHz which is recommended by ECC/DEC(01)01. An additional sub-band (5,805 GHz - 5,815 GHz) may be allocated on a national basis for RTTT. National restrictions on the usage of these frequency bands may apply according to CEPT/ERC REC 70-03. SIST EN 12253:2004



EN 12253:2004 (E) 5
1 Scope The DSRC Standards EN 12253, EN 12795 and EN 12834, which together form a three-layered architecture for DSRC, are designed to encompass a wide range of services for different purposes in order to make the basic DSRC architecture suited for many different applications and for a wide range of possible products and systems. This document: — specifies a physical layer at 5,8 GHz for DSRC as applicable in the field of Road Transport and Traffic Telematics (RTTT). — provides requirements for the communication medium to be used for exchange of information between road-side units (RSU) and on-board units (OBU). — caters for a communication means to be used by several applications in the RTTT sector. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ETSI EN 300674-1 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)
3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 General definitions 3.1.1 Adjacent channel refers to the use of a neighbouring DSRC channel by two or more emissions Note: It is possible that a DSRC channel has either one or two adjacent channels. 3.1.2 Antenna bore sight direction direction of maximum antenna gain 3.1.3 Bit error ratio averaged number of erroneous bits relative to the total number of transmitted bits 3.1.4 Channel for DSRC, a channel is indicated by reference to the downlink centre frequency of one of up to four frequency bands with 5 MHz width each. SIST EN 12253:2004



EN 12253:2004 (E) 6 3.1.5 Co-channel refers to the use of the same DSRC channel by two or more emissions 3.1.6 Downlink communication Communication from the RSU to the OBU
3.1.7 On Board Unit (OBU) physical assembly that is located and operated in or on the vehicle to transmit and/or receive DSRC signals. It may be in a form that is removable from the vehicle, or mountable in or on any part of the vehicle structure, or bonded to a part of the vehicle, or an integral part of a vehicle component, such as a windscreen, bumper or licence plate. In this document, parameters that refer to an OBU relate to the form that the OBU takes as it is supplied to the vehicle manufacturer or constructor. 3.1.8 Roadside Unit (RSU) DSRC equipment usually residing by the side of the road or overhead the road 3.1.9 Uplink communication communication from the OBU to the RSU 3.2 Downlink parameters Downlink parameters (prefixed D) apply to transmission of data from RSU to OBU. 3.2.1 D1  Carrier frequencies number and values of the downlink carrier frequencies, which are equal to the frequencies of the CW, transmitted by the RSU and used by transponder OBUs for uplink communication. Each carrier frequency is the centre frequency of a downlink channel. 3.2.2 D1a  Tolerance of carrier frequencies maximum deviation of the carrier frequency resulting from any cause. It is expressed in parts per million (ppm). EXAMPLE: ±1 ppm of a 5,8 GHz carrier allows for the carrier frequency to be in the range of 5,8 GHz ± 5,8 kHz. 3.2.3 D2  RSU transmitter spectrum mask maximum allowed power within a defined frequency band emitted by the RSU transmitter
3.2.4 D3  OBU minimum frequency range minimum range of frequencies that has to be received by the OBU receiver.
3.2.5 D4  Maximum E.I.R.P. See ETSI EN 300674-1 3.2.6 D4a  Angular E.I.R.P. mask E.I.R.P. as a function of the angle Θ, where Θ indicates the angle relative to a vector perpendicular to the road surface, pointing downwards SIST EN 12253:2004



EN 12253:2004 (E) 7 3.2.7 D5  Polarisation locus of the tip of the vector of the electrical field strength in a plane perpendicular to the transmission vector. Examples are horizontal and vertical linear polarisation and left and right hand circular polarisation. 3.2.8 D5a  Cross-polarisation (ellipticity of polarisation) 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 between left and right hand circular power PLHC/PRHC, when the total power transmitted is PLHC + PRHC. 3.2.9 D6  Modulation keying of the carrier wave by coded data. Some examples are Amplitude Shift Keying (ASK), Phase Shift Keying (PSK), Frequency Shift Keying (FSK) and linear Amplitude Modulation (AM). 3.2.10 D6a  Modulation index ratio of the variation of the modulation parameter (frequency, amplitude, phase) caused by the modulation signal (data signal)
For amplitude modulation the modulation index is minmaxminmaxVVVVm+−=
where V is the envelope amplitude of the modulated signal.
3.2.11 D7  Data coding base band signal presentation, i.e. a mapping of logical bits to physical signals. Examples are bi-phase schemes
(Manchester, FM0, FM1, differential Manchester), NRZ and NRZI. NRZI: No transition at beginning of "1" bit, transition at beginning of "0" bit, no transition within bit. 3.2.12 D8  Bit rate number of bits per second, independent of the data coding 3.2.13 D8a  Tolerance of bit clock maximum deviation of the bit clock resulting from any cause, expressed in ppm EXAMPLE: 100 ppm of 500 kbit/s allows for the bit clock to be in the range of 500 kHz ± 50 Hz
3.2.14 D9  Bit error ratio for communication
maximum allowed bit error ratio valid within the dynamic range of the receiver as defined by D11a and D11b 3.2.15 D10  Wake-up trigger for OBU signal which a) indicates to the OBU that it is within a communication zone, i.e. that it may now communicate with an RSU; b) switches the OBU main circuitry from sleep mode to the active mode This is a feature to allow the OBU to save battery power. It is not mandatory for an OBU to use a wake-up process. SIST EN 12253:2004



EN 12253:2004 (E) 8 3.2.16 D10a  Maximum start time maximum time between the reception of the wake-up trigger and the time when the OBU has switched to the active mode 3.2.17 D11  Communication zone spatial region within which the incident power of the OBU has a dynamic range as defined by D11a and D11b 3.2.18 D11a  Power limit for communication (upper) upper level of incident power referred to a lossless isotropic antenna (0 dB) in front of the OBU. This is the level below which, but subject to D11b, communication is guaranteed with a specified bit error ratio. (Communication may take place above this limit, but is not guaranteed.) Together with D11b it also specifie
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