World Class Standards Coexistence plugtest: CEN DSRC CEN DSRC / ITS-G5 coexistence RTTT / CEN DSRC Coexistence plugtest Ispra, Italy 4 July 2011 Anders Hjelmare © ETSI All rights reserved

World Class Standards 2 Electronic Fee Collection, EFC Electronic Toll Collection, ETC road tolls road user charges … Coexistence plugtest: CEN DSRC using RTTT CEN DSRC 5,8 GHz CEN TC278...

World Class Standards 3 In many countries Coexistence plugtest: CEN DSRC

World Class Standards 4 European history of RTTT / CEN DSRC Standardisation Deployment Worlds first ETC system in Aalesund, Norway 1991 Start of DSRC standardisation in CEN, Vienna agreement between CEN and ETSI Deployment of proprietary DSRC systems 1997 – First versions of the CEN DSRC standards Start deployment of systems based on CEN standard and closing down proprietary systems 2004 – Updated versions CEN standard systems currently deployed in 13 European Countries Complete set of ETSI test standards Coexistence plugtest: CEN DSRC

World Class Standards 5 Relevant documents  ERC Report 3: Frequency bands for RTTT  ERC Recommendation T/R  ERC Recommendation 70-03, Annex 5  ERC Decision (92)02: Frequency bands for RTTT  ECC Decision (02)01: Frequency bands for RTTT  EN RTTT DSRC Physical layer  EN RTTT DSRC Data Link Layer  EN RTTT DSRC Application Layer  EN RTTT DSRC Profiles  EN RTTT DSRC in 5,8 GHz ISM band Coexistence plugtest: CEN DSRC

World Class Standards 6 A small part of the radio frequency spectrum Coexistence plugtest: CEN DSRC 5000 MHz6000 MHz 5800 MHz5900 MHz RTTTITS G MHz

World Class Standards 7 EFC station side view Road Side Unit, RSU On Board Unit, OBU Downlink Uplink Coexistence plugtest: CEN DSRC Half duplex Backscatter RSU = master OBU = slave

World Class Standards 8 RTTT power levels (approx)  OBU is semi-passive!  RSU transmit power+33 dBm2 W  Downlink attenuation- 70 dB  OBU incident power- 47 dBm20 nW  OBU transmit power- 38 dBm160 nW  Uplink attenuation- 70 dB  RSU incident power- 108 dBm0,015 nW Coexistence plugtest: CEN DSRC

World Class Standards 9 OBU wake-up  Specified in EN  Sensitivity - 43 dBm or better  On any RTTT frame Coexistence plugtest: CEN DSRC  No specification for wake-up immunity  Vendor specific implementation and properties

World Class Standards 10 EFC, initialization Coexistence plugtest: CEN DSRC VST Vehicle Service Table OBU Beacon Service Table RSU BST

World Class Standards 11 EFC, transaction (example) Coexistence plugtest: CEN DSRC Read data RSU OBU GET.rq GET.rs SET.rq SET.rs Write data ACTION.rq Release

World Class Standards 12 EFC, frame timing (example) Coexistence plugtest: CEN DSRC Downlink = RSU modulated Uplink = RSU carrier only (OBU modulates carrier) Downlink Uplink Downlink BST Public Uplink DownlinkUplinkDownlink GET.rq Private Uplink ms

World Class Standards 13 EFC, transaction timing In high speed stations, RSU ‘thinking’ time is minimized (≈ ms) DownlinkUplinkDownlinkUplinkDownlinkUplinkDownlinkUplinkDownlinkUplink In free flow stations, exact transmission scheme is station specific Coexistence plugtest: CEN DSRC DownlinkUplinkDownlinkUplink In low speed stations, RSU ‘thinking’ time may be long ( ms ?)

World Class Standards 14 EFC, retransmission Exact retransmission scheme is station specific Coexistence plugtest: CEN DSRC If no uplink is received, RSU normally retransmits Frame 12 UplinkFrame 13 UplinkFrame 14Uplink

World Class Standards 15 EFC, transaction duration Coexistence plugtest: CEN DSRC 100% % ms Time available, good case Time available, worst case?

World Class Standards 16 EFC, transaction duration (2) Coexistence plugtest: CEN DSRC  Transaction times are statistically distributed  Longer transaction times > more transaction failures Road operators: <0,5% … <0,1% … 0% Max Transaction Error Ratio?

World Class Standards 17 End  Comments and Inputs Thank you for your attention! Anders Hjelmare Kapsch TrafficCom AB Coexistence plugtest: CEN DSRC