CAR 2 CAR Communication Consortium Survey on ITS-G5 CAM statistics CAR 2 CAR Communication Consortium About the C2C-CC Enhancing road safety and traffic efficiency by means of Cooperative Intelligent Transport Systems and Services (C-ITS) is the dedicated goal of the CAR 2 CAR Communication Consortium. The industrial driven, non-commercial association was founded in 2002 by vehicle manufacturers affiliated with the idea of cooperative road traffic based on Vehicle-to-Vehicle Communications (V2V) and supported by Vehicle-to-Infrastructure Communications (V2I). Today, the Consortium comprises 88 members, with 18 vehicle manufacturers, 39 equipment suppliers and 31 research organisations. Over the years, the CAR 2 CAR Communication Consortium has evolved to be one of the key players in preparing the initial deployment of C-ITS in Europe and the subsequent innovation phases. CAR 2 CAR members focus on wireless V2V communication applications based on ITS-G5 and concentrate all efforts on creating standards to ensure the interoperability of cooperative systems, spanning all vehicle classes across borders and brands. As a key contributor, the CAR 2 CAR Communication Consortium works in close cooperation with the European and international standardisation organisations such as ETSI and CEN. Disclaimer The present document has been developed within the CAR 2 CAR Communication Consortium and might be further elaborated within the CAR 2 CAR Communication Consortium. The CAR 2 CAR Communication Consortium and its members accept no liability for any use of this document and other documents from the CAR 2 CAR Communication Consortium for implementation. CAR 2 CAR Communication Consortium documents should be obtained directly from the CAR 2 CAR Communication Consortium. Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. © 2018, CAR 2 CAR Communication Consortium. C2CCC_TR_2052 20/12/2018 Page 1 of 35 CAR 2 CAR Communication Consortium Document information Number: TR2052 Version: 1.0.1 Date: 2018 – 12 – 10 Title: Survey on CAM statistics Document Technical Type: Report Release: 14 December 2018 Release Released for public sharing Status: Status: final Author: Company Author Chapter /Institute NXP Vincent Martinez FBConsulting Friedbert Berens Approval: Function Name, Company Date Signature release Steering Committee 14 Dec 18 Outstanding Issues Issue Author Chapter C2CCC_TR_2052 20/12/2018 Page 2 of 35 CAR 2 CAR Communication Consortium Changes since last version Title: Explanatory notes: Issue Rev. Date Changes Edited by Approved C2CCC_TR_2052 20/12/2018 Page 3 of 35 CAR 2 CAR Communication Consortium Content About the C2C-CC ..................................................................................................................... 1 Disclaimer .................................................................................................................................. 1 Document information ................................................................................................................ 2 Changes since last version ......................................................................................................... 3 Content ...................................................................................................................................... 4 List of tables ............................................................................................................................... 4 List of figures .............................................................................................................................. 5 1 Introduction ......................................................................................................................... 7 1.1 Abstract ........................................................................................................................ 7 1.2 Executive summary ...................................................................................................... 8 2 CAM structure and generation rules .................................................................................... 9 2.1 CAM structure overview ............................................................................................... 9 2.2 CAM generation algorithm .......................................................................................... 10 2.2.1 Example with triggering based on change of position ........................................................ 12 2.3 ITS-G5 stack: asynchronous messages ..................................................................... 13 3 Theoretical CAM sizes variability ....................................................................................... 14 3.1 Optional containers .................................................................................................... 14 3.2 Signatures and certificates ......................................................................................... 14 3.3 Number of pathHistory ............................................................................................... 15 4 Drive tests and traces captured ......................................................................................... 16 5 Methodology ...................................................................................................................... 18 6 Results analysis ................................................................................................................ 19 6.1 CAM sizes: variations versus time .............................................................................. 19 6.2 CAM sizes: histograms distribution view ..................................................................... 20 6.3 CAM: percentage of messages with certificates ......................................................... 21 6.4 CAM sizes: min, max and average statistics .............................................................. 22 6.5 CAM sizes: CDF distributions ..................................................................................... 22 6.6 CAM sizes: pathHistory detailed statistics .................................................................. 23 6.7 CAM time-intervals: variations vs time ........................................................................ 25 6.8 CAM time-intervals: histograms distribution view ........................................................ 27 6.9 CAM time-intervals delta: histograms distribution view ............................................... 29 6.10 CAM: duty cycles results ............................................................................................ 30 7 Conclusions ....................................................................................................................... 32 8 Appendix 1 – References .................................................................................................. 33 8.1 List of abbreviations ................................................................................................... 33 8.2 Related documents .................................................................................................... 34 8.3 CAM size histograms for each test drive .................................................................... 35 8.4 Acknowledgments ...................................................................................................... 35 List of tables Table 1-1 Executive summary, CAM statistics key observations ................................................ 8 Table 2-1 ITS station speed, equivalent time-intervals & transmit rate ...................................... 12 Table 2-2 AIFS and CW sizes for 802.11p broadcast messages .............................................. 13 Table 4-1 Traces collected for the CAM statistics survey .......................................................... 16 Table 6-1 Percentage of message with certificates per test-drive ............................................. 21 Table 6-2 Key CAM statistics for each test drive....................................................................... 22 Table 6-3 Number of pathHistory entries per test-drive ............................................................ 24 C2CCC_TR_2052 20/12/2018 Page 4 of 35 CAR 2 CAR Communication Consortium Table 6-4 ECC duty cycle requirements ................................................................................... 30 Table 6-5 Measured duty cycles for each test drive .................................................................. 30 List of figures Figure 2-1 Overview CAM Structure ......................................................................................... 10 Figure 2-2 CAM transmit rate depending on ITS station speed ................................................. 12 Figure 2-3 ITS-G5 stack view ................................................................................................... 13 Figure 3-1 Example structure of a certificate (table A.2 of ETSI TS 103 097) ........................... 14 Figure 4-1 VW urban drive map ................................................................................................ 17 Figure 4-2 VW suburban drive map .......................................................................................... 17 Figure 4-3 VW highway drive map ...........................................................................................