1、BRITISH STANDARD BS EN 12253:2004 Road transport and traffic telematics Dedicated short-range communication Physical layer using microwave at 5.8 GHz The European Standard EN 12253:2004 has the status of a British Standard ICS 35.240.60 BS EN 12253:2004 This British Standard was published under the
2、authority of the Standards Policy and Strategy Committee on 29 July 2004 BSI 29 July 2004 ISBN 0 580 44172 5 National foreword This British Standard is the official English language version of EN 12253:2004. It supersedes DD ENV 12253:1997 which is withdrawn. The UK participation in its preparation
3、was entrusted to Technical Committee EPL/278, Road transport informatics, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications
4、referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary p
5、rovisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretat
6、ion, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 17 and a back cover. The BSI copyright
7、 notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN12253 July2004 ICS35.240.60 SupersedesENV12253:1997 Englishversion RoadtransportandtraffictelematicsDedicatedshor
8、trange communicationPhysicallayerusingmicrowaveat5,8GHz TlmatiquedestransportsroutiersCommunication courteportevhicule/infrastructureCouchephysique utilisantlesmicroondes5,8GHz StraentransportundVerkehrstelematik(RTTT) NahbereichskommunikationFahrzeugBake(DSRC) BitbertragungsschichtfrdieFrequenz5,8G
9、Hz ThisEuropeanStandardwasapprovedbyCENon23April2004. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsma
10、ybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial
11、versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EURO
12、PEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2004CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN12253:2004:EEN 12253:2004 (E) 2 Contents page Foreword3 Introd
13、uction .4 1 Scope5 2 Normative references5 3 Terms and definitions .5 3.1 General definitions5 3.2 Downlink parameters6 3.3 Uplink parameters.8 4 Abbreviations.10 5 DSRC link parameters.11 5.1 General11 5.2 Downlink parameters11 5.3 Uplink parameters.14 Annex A (informative) A-deviations16 Bibliogra
14、phy 17 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
15、 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 coun
16、tries 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, Switzer
17、land and United Kingdom. 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 docu
18、ment 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
19、 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 Physica
20、l 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
21、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 Comm
22、unication (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 meas
23、urement 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 spac
24、e 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 restri
25、ctions on the usage of these frequency bands may apply according to CEPT/ERC REC 70-03. 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
26、 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
27、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 app
28、lication 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 Telem
29、atics (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 definition
30、s 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 bor
31、e 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 wi
32、dth each. 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 recei
33、ve 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
34、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 D
35、ownlink 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
36、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
37、 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
38、-1 3.2.6 D4a Angular E.I.R.P. mask E.I.R.P. as a function of the angle , where indicates the angle relative to a vector perpendicular to the road surface, pointing downwards 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 perpendic
39、ular 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 add
40、ition. Cross-Polar Discrimination (XPD) is defined as the ratio between left and right hand circular power P LHC/P RHC, when the total power transmitted is P LHC + P RHC. 3.2.9 D6 Modulation keying of the carrier wave by coded data. Some examples are Amplitude Shift Keying (ASK), Phase Shift Keying
41、(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 min max min max V V V
42、V m + = 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
43、 “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 f
44、or 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 comm
45、unication 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. EN 12253:2004 (E) 8 3.2.16 D10a Maximum start time ma
46、ximum 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)
47、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 D
48、11b it also specifies the minimum dynamic range of the OBU receiver. Power values are measured without any additional losses due to rain or misalignment. 3.2.19 D11b Power limit for communication (lower) lower level of incident power referred to a lossless isotropic antenna (0 dB) in front of the OBU. This is the level above which, but subject to D11a, communication is guaranteed with
