ASTM_E_2158_-_01.pdf

Designation:E 2158 01Standard Specification forDedicated Short Range Communication(DSRC)PhysicalLayer Using Microwave in the 902 to 928 MHz Band1This standard is issued under the fixed designation E 2158;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.INTRODUCTIONFOREWORDThis specification is intended to form a part of a series of standards defining the framework ofDSRC link in the North American Intelligent Transportation Systems(ITS)environment.In additionto this specification,Subcommittee E17.51(and other committees)will issue other standards to forma complete set of standards for the DSRC link.The Physical Layer Task Group consists primarily of experts from the telecommunications andtransport sectors.The most active participating companies and organizations are:equipmentmanufacturers,systems integrators,toll and turnpike agencies,research consultants,and interestedgroups and associations.Recommendations and decisions made by the United States Federal Communications Commission(FCC)and Industry Canada have served as references in the preparation of this specification(refer toSection 2Referenced Documents).Additional inputs came from experts from Europe and Japan(see Appendix X1Bibliography).This specification is applicable to operations in Canada,Mexico and the US to the extent allowedby national regulatory agenciesINTRODUCTIONDSRC is intended to meet the requirements for many of the applications that need short rangecommunication as defined by the National ITS Architecture and the Intelligent Transportation SocietyofAmerica.These applications includeAdvanced Traveller Information Systems(ATIS),CommercialVehicle Operations(CVO),Advanced Vehicle Control Systems(AVCS),Electronic Toll and TrafficManagement Systems(ETTM),Advanced Public Transportation Systems(APTS),and AdvancedTransportation Management Systems(ATMS).This specification comprises requirements for Open Systems Interconnection(OSI)Layer 1 in the902 to 928 MHz Location and Monitoring Service(LMS)band for DSRC.This specification does notinclude associated measurement procedures for verification of the requirements.Measurementguidelines will be developed in another document as a separate work item.The presented requirements distinguish between default and optional parameter values.Proceduresfor using optional parameters include consideration of upper OSI layers.The elaboration of suchprocedures will be subject to further work within Subcommittee E17.51.This specification provides information for onboard equipment based on active as well asbackscatter technologies,and allows for interoperability between systems based on both of thesetechnologies.Furthermore,this specification allows for mixed time,frequency,and space divisionmultiple access approaches.This specification is conceived for the 2+10+2 MHz part,902 to 904 MHz,909.75 to 919.75MHz,and 919.75 to 921.75 MHz,of the LMS band.The 902 to 904 MHz region is used forunmodulated carriers to provide backscatter capability in this portion of the band.All of thesefrequencies in the LMS band are currently available for use in the US and Canada.This specification contains requirements that minimize interference between sites and betweenactive and backscatter systems.The active legacy systems currently operate and will continue tooperate uplinks and downlinks on the 915.00 and 915.75 MHz center frequencies.This specificationadds the possibility of operating new active downlink center frequencies on and between 915.00 and918.75 MHz.However,the primary active downlink operating frequencies will be 915 and 918.751Copyright ASTM,100 Barr Harbor Drive,West Conshohocken,PA 19428-2959,United States.MHz.The backscatter systems operate on all the frequencies between 902 and 904 MHz and 909.75and 921.75 MHz while using power levels consistent with the out-of-band emissions requirements.However,in order to operate at the power levels allowed in this specification and minimizeinterference between systems and sites,the following designations have been made.912.75 and918.75 MHz will be the primary backscatter downlink operating frequencies just as 915 and 918.75MHz will be the primary active downlink operating frequencies.The required active uplink frequencyis 915.00 MHz.The primary backscatter uplink sideband frequencies are 910.75,914.75,916.75,and920.75 MHz.Fig.1,shows the ASTM 902 to 928 MHz ISM Band Utilization.The above described frequency usage plan enables reduced separation distance between sites forboth active and backscatter systems.Multiple active installations,with 918.75 MHz for the activedownlink and 915.00 MHz for the active uplink,can be installed with less separation distance than thecurrent 915.00 MHz systems.This is possible because the uplink receiver experi