【正文】 ., ? Transaction Success Rate to % ? Enable Licensed Operation ? Implement Vehicle Location ? Implement Lane Discrimination (implies specification on antenna type and OBU mounting) ? Implement a High Density of Applications ? Support Multiple Overlapping Communication Zones ? Meet FCC, Industry Canada, and Mexican Government Regulations ? Enable An Entry Level low cost device ? Does Not Require Usage Fees ? Multimodal (road and rail) ? The OBU must be able to negotiate the frequency of operation ? Must provide prioritized media access GHz DSRC OPERATIONAL CONCEPT/TECHNOLOGY REQUIREMENTS GREEN Primary Influence on Concept ? Approach: Active ? Bandwidth: 75 MHz ( GHz) ? Modulation: QPSK OFDM (with 16QAM and 64QAM options) (BPSK preamble) ? Channels: 7 10 MHz channels (optional binations of 10 and 20 MHz channels) ? Data Rate: 6, 9, 12, 18, 24, and 27 Mbps with 10 MHz Channels (3 Mbps preamble) ? (or 6, 9, 12, 18, 24, 36, 48, and 54 Mbps with 20 MHz Channel option) (6 Mbps preamble) ? Max Tx Pwr: dBm (at the antenna input) ? RSU EIRP: Nominal 0 33 dBm (1 mW 2 W) / Max. dBm (30 W) ? OBU EIRP: Nominal 0 20 dBm (1 100 mW) / Max. dBm (30 W) ? RSU and OBU Sensitivity: 82 dBm (QPSK) / 65 dBm (64QAM) ? C/I: 4 6 dB (for QPSK 104 BER coded) / 16 17 dB (for 64QAM 104 BER coded) ? Band Sharing Strategy Frequency Coordination. Selection of alternate channels for adjacent zones. Use CSMA to prevent interference between users in the channel. GHz DSRC TECHNOLOGY CHARACTERISTICS RSU Roadside Unit。 EIRP Effective Isotropic Radiated Power。 EV Emergency Vehicle。 GHz DEDICATED SHORT RANGE COMMUNICATION (DSRC) STANDARDS DEVELOPMENT UPDATE GHz DSRC CONCEPT GHz DSRC (Dedicated Short Range Communications) is a short to medium range munications service that supports both Public Safety and Private operations in roadside to vehicle and vehicle to vehicle munication environments. DSRC is meant to be a plement to cellular munications by providing very high data transfer rates in circumstances where minimizing latency in the munication link and isolating relatively small munication zones are important. ASTM GHz DSRC STANDARDS WRITING GROUP PARTICIPATION ? 3M ? AASHTO ? ACUNIA ? AMTECH ? ARINC ? ARMSTRONG COUNSULTING ? ATHEROS ? CALTRANS ? DIAMLERCHRYSLER ? DENSO ? GM ? GTRI ? HIGHWAY ELECTRONICS ? HITACHI ? IDMICRO ? IMEC ? INTERSIL ? ITSA ? JHU/APL ? KING COUNTY METRO TRANSIT ? MARK IV ? MiCOM Spa ? MICHIGAN STATE DOT ? MITRETEK ? MOTOROLA ? NISSAN ? . THRUWAY AUTHORITY ? OKI ELECTRIC ? PATH ? RAYTHEON ? SIRIT ? SUMITOMO ELECTRIC ? TECHNOCOM ? TOSHIBA ? TRANSCORE ? VISTEON ? WASHINGTON STATE DOT ? WiLAN ASTM GHz DSRC STANDARDS DEVELOPMENT ACTIVITY MEETINGS SINCE REPORT AND ORDER ? October 1999 ? December 1999 ? February 2023 ? March 2023 ? May 2023 ? June 2023 ? July 2023 ? September 2023 ? October 2023 ? November 2023 ? December 2023 ? January 2023 ? March 2023 ? April 2023 ? May 2023 MEETINGS SINCE REPORT AND ORDER ? June 2023 ? July 2023 ? August 2023* ? October 2023 ? December 2023 ? January 2023 ? February 2023 MEETINGS CURRENTLY SCHEDULED ? March 2023 ? May 2023 ? June 2023 * Technology Selection Meeting GHz DSRC TECHNOLOGY SELECTION ? The initial selection between the Motorola entry and the OFDM forum entry was made by the ASTM DSRC Standards Writing Group on August 24, 2023. ? THE WINNER was the OFDM forum entry IEEE Physical Layer and the IEEE Medium Access Control (MAC) Layer. (RA – Road Access) ? The writing group selection was confirmed by letter ballot vote of the Larger ASTM submittee in October 2023. ? The ASTM DSRC STD XXXX* will be a modified version of IEEE with 10 MHz wide channels instead of 20 MHz channels and half the data rate. It will include the IEEE Medium Access Control (MAC) Layer with no anticipated changes. * ASTM Standard numbers are assigned only when plete CURRENT GHz DSRC ARCHITECTURE CONFIGURATION Layer 2 Logical Link Control/ (LLC) IEEE Resource Manager Application/ ISO ????/ IEEE ???? Layer 1/2 Physical Layer (PHY) w /MAC /LLC REFs ASTM XXXX Layers 3 7 Application Layer IEEE XXXX CHANNEL MANAGER System Management Entity (SME) ASTM YYYY GHz North American Architecture Specification ASTM ????A GHz Test Procedure Specification ASTM ????T Layer 2 Medium Access Control (MAC) IEEE Established Standards and procedures that are referenced as necessary Standards that must be modified or pleted Standards that must be written CORE DSRC ARCHITECTURE OTHER NETWORK INTERFACE EXISTING STANDARDS Layer 1 Physical Layer/ (PHY) IEEE Resource Manager Application/ Layers 37 IEEE 1455 DSRC CAPABILITIES SPECTRUM USED DATA RATE COVERAGE ALLOCATION STATUS INTERFERENCE POTENTIAL MAXIMUM RANGE CHANNEL CAPACITY POWER (Downlink) POWER (Uplink) 12 MHz ( to MHz) Mbps Large distances between munication zones No protection Many 900 MHz Phones, Many Rail Car AEI Readers, Many Spread Spectrum Devices, Wind Profile Radars 300 ft (at required 30 dBm sensitivity) 1 to 2 channels Nominally less than 40 dBm (10 W) Nominally less than 6 dBm ( 4mW) 75 MHz 6 Mbps 27 Mbps Overlapping munication zones needed and allowed Primary Status (high protect