![“Detect-and-vacate” concept
• Key is to avoid colliding with or delaying DSRC packets
• Wi-Fi devices already avoid overlapping transmissions via
a ―listen-then-talk‖ protocol
• Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA)
• Wi-Fi can detect DSRC device in area via similar function
that looks for 10 MHz DSRC packet ―signature‖
• Before sending anywhere in 5.9 GHz band, listen for
DSRC in all 7 channels
• If no DSRC detected, ok to operate WLAN
• If DSRC detected, keep out of the band for [TBD] time
•
For more information see: https://mentor.ieee.org/802.11/dcn/13/11-13-099400-0reg-proposal-for-u-nii-4-devices.docx
See: J. Lansford, J. Kenney, and P. Ecclesine, “Coexistence of Unlicensed
Devices with DSRC Systems in the 5.9 GHz ITS Band,” IEEE VNC 2013
23
mentor.com/embedded](https://image.slidesharecdn.com/v2xhangout-ac-final-140207161048-phpapp02/85/Technology-Business-and-Regulation-of-the-Connected-Car-23-320.jpg)
Technology, Business and Regulation of the Connected Car
- 1. Technology, Business and Regulation of the “Connected Car” Alison Chaiken John Kenney Mentor Embedded Software Toyota InfoTechnology Center alison_chaiken@mentor.com jkenney@us.toyota-itc.com 1 mentor.com/embedded
- 2. Agenda Alison: Connected vehicle safety and traffic management Connection modalities: LTE, 802.11p, SMS, satellite . . . John: V2X Protocols and spectrum Security and scalability Alison: European and U.S. pilot projects Available HW and SW Immediate prospects 2 mentor.com/embedded
- 3. V2X Terminology Vehicle-to-vehicle (V2V) Vehicle-to-infrastructure (V2I) On Board Unit (US) = ITS Vehicle Station (EU) Road Side Unit (US) = ITS Roadside Station (EU) Dedicated Short Range Communication (DSRC) = automated tolling in E.U. but safety messages in U.S. 3 mentor.com/embedded
- 5. “Killer App”: Green-light optimal speed advisory GLOSA will allow drivers to set optimal green-signal speed. 5 mentor.com/embedded
- 6. 802.11p vs. LTE vs. Satellite and FM 802.11p is the only low-latency safety channel. LTE has the largest install base and is industry-funded. Terrestrial and satellite radio, data-over-voice, SMS also: + 3G (UMTS) already employed in simTD (Germany) and Smart In-Car (Netherlands). Telcos are investing heavily in automotive. 6 mentor.com/embedded
- 7. Automotive networking needs new protocols in every layer 7 mentor.com/embedded
- 8. John: V2X protocols and spectrum Security and scalability 8 mentor.com/embedded
- 9. DSRC Standards Overview • Necessary for interoperability DSRC Security (IEEE 1609.2) 2013 Messages (SAE J2735) • Most standards fairly mature 2009 Non-safety applications Min. Perf. Req. (SAE J2945) Draft DSRC WSMP TCP/UDP Service Advertisement 2010 2010 2010 (IEEE 1609.3) IPv6 DSRC Upper-MAC (IEEE 1609.4) DSRC PHY+MAC (IEEE 802.11p) See: J. Kenney, “DSRC Standards in the United States”, Proc. IEEE, July 2011, Vol. 99, No. 7, pp. 1162-1182 9 mentor.com/embedded
- 10. Comparison 802.11p with AP LAN Access Point Step 1 Authentication Access Point Step 2 Association Access Point Step 3 Data Exchange Communication is “Outside the Context of a Basic Service Set” (or OCB, i.e. truly ad hoc) 802.11p Immediate Data Exchange Avoiding setup delay is critical for high mobility “Wireless Access in Vehicular Environments” (WAVE) 10 mentor.com/embedded
- 11. DSRC Network & Transport Layers (1609.3) Two choices in US 1.WAVE Short Message Protocol (WSMP) • Lightweight compared to Internet protocols (5 byte header) • No routing • Adequate for many DSRC applications 2.IPv6 + TCP/UDP •Note: In Europe a “Geo-Networking” protocol is being defined 11 mentor.com/embedded
- 12. 1609.2 Security Services Two primary functions: 1. Authentication – Shows sender is authorized, and that data not altered 2. Encryption – keeps data secret (need for this limited) Both use ―elliptic curve‖ cryptographic algorithms Note: Privacy is key element of V2X security 1609.2 supports pseudonymous certificates – not linked to car Identifiers (certificates, MAC, etc.) changed every few minutes 12 mentor.com/embedded
- 13. SAE J2735 Basic Safety Message (BSM) Item Time 3D Position Position Accuracy Speed Heading Steering Wheel Angle Acceleration Brake Status Vehicle Size Event Flags Path History Not included in every BSM Path Prediction Other optional fields BSM is broadcast by each vehicle several times per second over a few hundred meters 13 mentor.com/embedded
- 14. We’ve come a long way 2013 apps interoperability privacy Policy Business channelization Technical Governance 1999 14 mentor.com/embedded
- 15. Still to go … near term 15 mentor.com/embedded
- 16. Security Infrastructure Can I trust you? Get/Renew credentials? Detect misbehavior? CA Internally segregated to prevent insider attack Example misbehavior: BSM with valid signature reports fictitious car. New Certificates Certificate Revocation Lists Certificate Authority (CA) Misbehavior Reports What medium? 16 mentor.com/embedded
- 17. Positioning Relative Distance? Which Lane? Where in Lane? Which Road? 17 mentor.com/embedded
- 18. Scalability Basic question: will all this still work here? 18 mentor.com/embedded
- 19. Aspects of Scalability • Processing resource • Collision threat assessment • Per-message Security • Wireless Channel resource • Security Infrastructure Hard to throw money at this one 19 mentor.com/embedded
- 20. US DSRC Spectrum: Seven 10 MHz channels 5.850 GHz 5.925 GHz CH 175 20 MHz CH 181 20 MHz CH 174 CH 176 CH 178 CH 180 CH 182 CH 184 Service Service Service Control Service Service Service 10 MHz Reserved 5 MHz CH 172 10 MHz 10 MHz 10 MHz 10 MHz 10 MHz 10 MHz Ch. 172: Collision Avoidance Safety • • • Ch. 184: Public Safety Ch. 178: Control Channel WAVE Service Advertisements are broadcast here, indicating how to access services on other ―Service Channels‖ 20 mentor.com/embedded
- 21. Potential new Wi-Fi channels in 5 GHz band IEEE channel # 20 MHz 40 MHz 80 MHz 160 MHz New channels 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124 128 132 136 140 144 149 153 157 161 165 169 173 177 181 Currently available channels NEW UNII-1 UNII-2A UNII-2B 5250 5350 5470 MHz MHz MHz UNII-2C NEW UNII-3 UNII-4 5725 5825 5925 MHz MHz MHz • 802.11n introduced 40 MHz channels • 802.11ac introducing 80 MHz and 160 MHz channels • UNI-2 (A, B, C): radar is primary, Dynamic Frequency Selection (DFS) is required by Wi-Fi 21 mentor.com/embedded
- 22. Spectrum Sharing Timeline Key steps: – Identify sharing technology candidate(s) – Test rigorously NTIA 5 GHz report: support sharing, note risks (Jan.) President: Make 500 MHz new spectrum available by 2020 2010 NPRM 13-49 comments due (May) New law requires: •FCC and NTIA to act on 5.3 GHz •NTIA to study 5.9 GHz (Feb.) IEEE 802.11 forms tech. Tiger Team (Aug.) US House Hearing (Nov.) 2011 Global mobile data volume more than doubles for 4th year in a row 2012 Pres. Council Advisors Science & Tech (PCAST) calls for 1000 MHz shared use pilot projects (July) 2014 2013 FCC NPRM 13-49: Share 5.3 and 5.9, Simplify 5 GHz rules (Feb.) FCC = Federal Communications Commission NTIA = National Telecommunications and Information Administration 2015 Auto group met with FCC and White House Science Office (Sept.) NPRM 13-49 reply comments due (July) 22 mentor.com/embedded
- 23. “Detect-and-vacate” concept • Key is to avoid colliding with or delaying DSRC packets • Wi-Fi devices already avoid overlapping transmissions via a ―listen-then-talk‖ protocol • Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) • Wi-Fi can detect DSRC device in area via similar function that looks for 10 MHz DSRC packet ―signature‖ • Before sending anywhere in 5.9 GHz band, listen for DSRC in all 7 channels • If no DSRC detected, ok to operate WLAN • If DSRC detected, keep out of the band for [TBD] time • For more information see: https://mentor.ieee.org/802.11/dcn/13/11-13-099400-0reg-proposal-for-u-nii-4-devices.docx See: J. Lansford, J. Kenney, and P. Ecclesine, “Coexistence of Unlicensed Devices with DSRC Systems in the 5.9 GHz ITS Band,” IEEE VNC 2013 23 mentor.com/embedded
- 24. Available V2X Hardware and Software 24 mentor.com/embedded
- 25. Manufacturers of 802.11p radios NEC NXP/Cohda Cisco/Cohda Wireless Commsignia (BSD-based) Denso UNEX DCMA-86P2 miniPCI Delphi Savari Kapsch Siemens UNEX AutoTalks Arada DGE Componentality Broadcom collected by Alexandru Petrescu, cea.fr http://unex.com.tw/product/obe-101 25 mentor.com/embedded
- 26. RSUs and OBUs are mostly OpenWRT (Linux) routers In-vehicle Roadside 802.11p chipsets made by Atheros, Ralink, Cohda/NXP Image: “IntelliDrive Technology based Yellow Onset ® Decision Assistance System for Trucks”, Sharma et al. http://openwrt.org/ 26 mentor.com/embedded
- 27. Recently completed field trials: simTD, Safety Pilot, Smart In-Car http://simtd.de/ http://www.its.dot.gov/presentations.htm http://www.ertico.com/smart-in-car-trial-car-data-real-timeaccessible-to-improve-traffic-flow-and-increase-traffic-safety/ 27 mentor.com/embedded
- 28. Safety Pilot V2V trial in Ann Arbor MI Originally 8/2012-8/2013, but extended. 2800 cars, trucks and buses from 7 automakers. 64 embedded systems, 300 aftermarket, rest transmit-only. NHTSA decision expected in December 2013. — ―Notice of Proposed Rule Making‖ likely late 2014 http://www.its.dot.gov/presentations.htm 28 mentor.com/embedded
- 29. E.U.'s Safe Intelligent Mobility—Test Area Germany (simTD) Pilot ● Emphasizes V2I. ● Opel; Audi; BMW; Daimler; Ford; VW; Bosch; Conti; Deutsche Telekom, plus govs and unis. ● 120 vehicles and 3 motorcycles plus RSUs. ● Data collection 2012-6/2013, 41K hrs and 1.65M km. ● 2015: ‘Cooperative ITS Corridor Rotterdam - Frankfurt am Main Vienna’ — Features ―Roadworks Warning‖ and ―Detection of Traffic Conditions‖. http://simtd.de/ 29 mentor.com/embedded
- 30. Architecture of simTD Unlike SafetyPilot, includes Central Station and emphasizes V2I. 30 mentor.com/embedded
- 32. Conclusions V2X is a key enabler of vehicle autonomy. Enormous potential to improve safety and optimize traffic flow. Burgeoning opportunities for HW, SW, backhaul, analytics . . . Extensive government investment in EU and U.S. Now is a great time to get involved. 32 mentor.com/embedded
- 33. Resources • ITSSv6 • IETF-ITS mailing list https://project.inria.fr/itssv6/users/ • CALM https://www.ietf.org/mailman/listinfo/its • http://calm.its-standards.info/ • Componentality's FlexRoad and Drivity http://componentality.com/ SAE, IEEE, ISO, IETF, FCC, NHTSA standards http://componentality.com/flexroad/ http://componentality.com/drivity/ • simTD http://simtd.de/ • Safety Pilot http://www.its.dot.gov/presentations.htm • • Telematics News http://telematicsnews.info/ • Wired Autopia http://wired.com/autopia/ • slideshare.net/chaiken Smart In-Car http://slideshare.net/chaiken http://www.ertico.com/smart-in-car-trial-car-data-real-time-accessible-to-improve-traffic-flow-and-increase-traffic-safety/ • ETSI, ISO C-ITS http://www.etsi.org/index.php/technologies-clusters/technologies/intelligent-transport • Automotive Grade Linux http://www.linuxfoundation.org/collaborate/workgroups/automotive-grade-linux 33 mentor.com/embedded
- 34. Extras
- 35. SAE Standards J2735 Message Set Dictionary • Defines 15 messages and constituent data elements • Key messages: • Basic Safety Message (V2V safety) • Signal Phase and Timing • MAP Typically sent by roadside unit at intersection J2945 Minimum Performance Requirements (MPR) • Not yet published – expected 2015 • Example content for Basic Safety Message: • Message frequency and transmit power • Accuracy of sensor data in message (e.g. position, velocity) 35 mentor.com/embedded
- 36. DSRC Spectrum Sharing Wi-Fi has been a tremendous success US Government supports allowing Wi-Fi to share spectrum in new bands with ―primary users‖ (e.g. radar, satellite) US FCC considering allowing Wi-Fi to share 5.9 GHz DSRC band Issued ―Notice of Proposed Rule Making‖ Feb. 2013 Requested comments from stakeholders IEEE 802.11 ―Tiger Team‖ considering technical sharing solutions ―Detect-and-vacate‖ option ―Re-channelize and share packet by packet‖ option Auto industry wants to ensure no ―Harmful Interference‖ from Wi-Fi. Not yet clear if a solution exists. Any candidate solution will require rigorous testing 36 mentor.com/embedded
- 37. Safety Channel Scalability Message Rate Transmit Power Data Rate Packet Length Sensitivity Control • Lots of control knobs • Can be used in combination or alone • Can be responsive to different stimuli Reasons why we emphasize message rate: • Predictable impact independent of topology • Maintain connectivity at distances of interest • Fine grained control • Large dynamic range (no obvious minimum) • Toyota ITC’s LIMERIC algorithm is under investigation in US and EU See: G. Bansal, J. Kenney, and C. Rohrs, “LIMERIC: A Linear Adaptive Message Rate Control Algorithm for DSRC Congestion Control, “IEEE Trans Vehicular Technology, Vol. 62, Issue 9, pp. 4182-4197, November 2013 37 mentor.com/embedded
- 38. DSRC Standards Overview • Necessary for interoperability DSRC Security (IEEE 1609.2) Message Dictionary (SAE J2735) • Most standards fairly mature Non-safety applications Min. Perf. Req. (SAE J2945) DSRC WSMP TCP/UDP Service Advertisement (IEEE 1609.3) IPv6 DSRC Upper-MAC (IEEE 1609.4) DSRC PHY+MAC (IEEE 802.11p) See: J. Kenney, “DSRC Standards in the United States”, Proc. IEEE, July 2011, Vol. 99, No. 7, pp. 1162-1182 38 mentor.com/embedded
- 39. IEEE 1609.4: Multi-Channel Operation • Objective: Multiplex one radio effectively among multiple channels • Approach: use time division • Optional: Not used for safety channel in US Sync period 100 msec Sync period 100 msec Control Channel Interval (advertise) Service Channel Interval (access service) Control Channel Interval (advertise) Service Channel Interval (access service) 50 msec 50 msec time 39 mentor.com/embedded
- 40. Componentality: open-source 802.11p stack: the bluez of DSRC? Source: “Using Open Source Solutions for V2V and V2I Communications,” Automotive Grade Linux webinar 40 mentor.com/embedded
- 41. 802.11p (WAVE) vs. other Comms Modes Lower-overhead protocol for safety messages. No access point (AP) and no basic service set (BSS) — Too much delay for moving vehicles. — Lower latency than 802.11a/b/g/n, LTE or satellite. Message priorities 0-7. Half-width channels; always ad hoc. Up to 33 dBm (~1 km) in E.U. and 44 dBm in U.S. No upstream Linux driver. 41 mentor.com/embedded
- 42. Source: M. Lukuc, Connected Vehicle Public Meeting 42 mentor.com/embedded
- 43. Why V2V needs low latency Source: J. Harding, Connected Vehicle Public Meeting 43 mentor.com/embedded
- 44. Dual protocol stacks of simTD ● Based on ETSI ITS G5 plus GeoNetworking. Management Applications Information Connector Active Safety Application Traffic Efficiency Application Infotainment Application Transport C2C Transport TCP / UDP / Other Network C2C Network IPv6 Option Mobile IPv6 NEMO C2C Network Physical Communication Technologies European Version of IEEE 802.11p and IEEE 1609.4 IEEE 802.11 PHY/MAC (IEEE 802.11 a,b,g) Other Radio (e.g UMTS) From Automotive Internetworking, courtesy M. Bechler, BMW. 44 mentor.com/embedded
- 45. simTD's “vehicle stations” Linux router + Windows XP Host Ref.: H. Stübing et al., IEEE Comm. 148 (2010). 45 mentor.com/embedded
- 46. Linux in V2I: Advanced Transportation Controller (ATC) Applications: GLOSA; Traffic Surveillance; Ramp Meter; Dynamic Message Signs; Weather monitor; Weigh stations; Rail intersections; Lane usage controls; Roadworks warning . . . Source: Institute for Traffic Engineers 46 mentor.com/embedded
- 47. Internet Engineering Task Force (IETF) work on Geonetworking and ITS 3 draft standards in preparation — Geonetworking (submitted) — 'Scenarios and Requirements for IP in Intelligent Transportation Systems' (submitted) — IPv6 over 802.11p (particular GENIVI interest) — V2X (with MANET working group of IETF?) Info: https://www.ietf.org/mailman/listinfo/its chief organizer: Alex Petrescu of CEA in contact with GENIVI Networking Expert Group 47 mentor.com/embedded
- 48. Special cases Transit-service vehicles Emergency responders Over-the-air software updates Agricultural equipment Fleet vehicles Rental cars … and many more. 48 mentor.com/embedded
- 49. Safety Pilot's transit vehicle system Source: S. Mortensen, Connected Vehicle Public Meeting 49 mentor.com/embedded
- 51. Safety Pilot participants Roadside: Arada, Kapsch, ITRI,.Cohda/Cisco, Savari In-vehicle: AutoTalks, Cohda, Denso, DGE, ITRI, Savari, Arada Aftermarket Safety Devices: Cohda/Delphi, Cohda/Visteon , Denso, Kapsch Automakers: GM, Ford, Toyota, Honda, VW, Daimler, Hyundai and Nissan 51 mentor.com/embedded