Observations on OMNeT++ Real-Time Behaviour
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1 Observations on OMNeT++ Real-Time Behaviour Christina Obermaier, Christian Facchi 7. September 2017
2 Outline 1. Inter Vehicle Communication 2. HIL Testing with OMNeT++ 3. Timing Observations 4. Conclusion 5. Further Work 2 Christina Obermaier, Christian Facchi 7. September 2017
3 3 Christina Obermaier, Christian Facchi 7. September 2017 Inter Vehicle Communication
4 Inter Vehicle Communication Overview Features Communication between vehicles as well as road side units Acts like a 360 degree (bidirectional) sensor Enhances traffic flow and traffic safety 4 Christina Obermaier, Christian Facchi 7. September 2017
5 Inter Vehicle Communication ETSI ITS-G5 Protocol Stack DCC Security Facilities & Applications GeoNet & BTP ETSI ITS-G5 MAC: EDCA PHY: 5.9 GHz OFDM IEEE p 5 Christina Obermaier, Christian Facchi 7. September 2017
6 Inter Vehicle Communication ETSI ITS-G5 Protocol Stack DCC Security Facilities & Applications GeoNet & BTP ETSI ITS-G5 MAC: EDCA PHY: 5.9 GHz OFDM IEEE p dedicated spectrum 5 Christina Obermaier, Christian Facchi 7. September 2017
7 Inter Vehicle Communication ETSI ITS-G5 Protocol Stack DCC Security Facilities & Applications ETSI ITS-G5 GeoNet Outside & BTP the Context of Basic Service Set (OCB) MAC: EDCA PHY: 5.9 GHz OFDM IEEE p 5 Christina Obermaier, Christian Facchi 7. September 2017
8 Inter Vehicle Communication ETSI ITS-G5 Protocol Stack DCC Security Facilities & Applications GeoNet & BTP ETSI ITS-G5 geographical routing MAC: EDCA PHY: 5.9 GHz OFDM IEEE p 5 Christina Obermaier, Christian Facchi 7. September 2017
9 Inter Vehicle Communication ETSI ITS-G5 Protocol Stack DCC Security Facilities & Applications GeoNet local & knowledge BTP base ETSI ITS-G5 MAC: EDCA PHY: 5.9 GHz OFDM IEEE p 5 Christina Obermaier, Christian Facchi 7. September 2017
10 Inter Vehicle Communication ETSI ITS-G5 Protocol Stack DCC Security Facilities & Applications GeoNet HMI, automated & BTP driving ETSI ITS-G5 MAC: EDCA PHY: 5.9 GHz OFDM IEEE p 5 Christina Obermaier, Christian Facchi 7. September 2017
11 Inter Vehicle Communication ETSI ITS-G5 Protocol Stack DCC Security Facilities & Applications GeoNet & BTP ETSI ITS-G5 Congestion MAC: Control EDCA packets, bitrate, tx power PHY: 5.9 GHz OFDM IEEE p 5 Christina Obermaier, Christian Facchi 7. September 2017
12 Inter Vehicle Communication ETSI ITS-G5 Protocol Stack DCC Security Facilities & Applications GeoNet & BTP ETSI ITS-G5 Privacy & Authenticity MAC: EDCA PHY: 5.9 GHz OFDM IEEE p 5 Christina Obermaier, Christian Facchi 7. September 2017
13 Simulation Tools VANET simulation tools by THI Research Centre open-source ITS-G5 stack standard compliant packets integrated in Artery variable application sets suitable for rapid prototyping soon: radar sensors Available at vanetza} 6 Christina Obermaier, Christian Facchi 7. September 2017
14 7 Christina Obermaier, Christian Facchi 7. September 2017 HIL Testing with OMNeT++
15 HIL Concept Overview HIL Overview Simulated environment vehicles (blue) Physical twin vehicle with stripped down functionality (red) p proxy (USRP RIO) Message forwarding Simulated packets are sent over the air 8 Christina Obermaier, Christian Facchi 7. September 2017
16 HIL Concept Possible Problems Timing Problems OMNeT++ is running too fast OMNeT++ is running too slow Running too slow is not recognized 9 Christina Obermaier, Christian Facchi 7. September 2017
17 HIL Testing Real Time Scheduler cevent* RealTimeScheduler::takeNextEvent pseudocode Result: next cevent currentrealtimemiss = simtime - wallclocktime; if (currentrealtimemiss * -1) realtimemissthreshold then // simulation unacceptable slow stop simulation; else eventduration = wallclocktime - eventstarttime; log currentrealtimemiss and eventduration and nexteventidentifier; while SimTime wallclocktime do // simulation faster than real time wait; end set nexteventidentifier; set eventstarttime; return nextevent; end 10 Christina Obermaier, Christian Facchi 7. September 2017
18 HIL Testing Real Time Requirements Duplicate packet detection GPS timestamp Replay attack detection DENM validity Long range communication using MAC layer unicasts 11 Christina Obermaier, Christian Facchi 7. September 2017
19 12 Christina Obermaier, Christian Facchi 7. September 2017 Timing Observations
20 Real-Time Observations Scenario Description Hardware Component Laptop Computer Simulation Cluster CPU Intel Core 2.40GHz Cores 1 x 4 4 x 18 RAM 16GB 3TB Intel Xeon E GHz Hard Drive 256GB SSD 450GB SAS SSD RAID 1 Scenario Three vehicles on highway Five vehicles on highway 13 Christina Obermaier, Christian Facchi 7. September 2017
21 Real-Time Observations Event List ID Event name # Events 3 vehicles 1 TraCI Connect TraCI Step GeoNet packet GeoNet data frame txstart endifs configureradiomode transmissiontimer remove non Interfering Transmission report CL middleware update txstart GeoNet radio frame # Events 5 vehicles 14 reception Timer Overall events Christina Obermaier, Christian Facchi 7. September 2017
22 Real-Time Observation Event Times 1e+00 1e+00 Event Duration in [s] 1e-02 1e-04 Event Duration in [s] 1e-02 1e Event ID Event ID Figure: Event times cluster Figure: Event times laptop 15 Christina Obermaier, Christian Facchi 7. September 2017
23 Real-Time Observation Real-Time Flow 0.04 Real time in [s] vehicles (laptop) 3 vehicles (cluster) instant event durations real time delay Simulation time in [s] Real time in [s] vehicles (laptop) 5 vehicles (cluster) instant event durations real time delay Simulation time in [s] 16 Christina Obermaier, Christian Facchi 7. September 2017
24 Real-Time Observation Simulation Run Overview Amount of Events Amount of Events Real Time Loss in [s] Real Time Loss in [s] Amount of Events Amount of Events Real Time Loss in [s] Real Time Loss in [s] Figure: Laptop Figure: Cluster 17 Christina Obermaier, Christian Facchi 7. September 2017
25 18 Christina Obermaier, Christian Facchi 7. September 2017 Conclusion
26 Conclusion Which Parts can be Tested Properly? Duplicate packet detection GPS timestamp Replay attack detection DENM validity Long range communication using MAC layer unicasts 19 Christina Obermaier, Christian Facchi 7. September 2017
27 20 Christina Obermaier, Christian Facchi 7. September 2017 Further Work
28 Further Work Tweak simulation performance Add some parallelism Replay simulated test data 21 Christina Obermaier, Christian Facchi 7. September 2017
29 Thank You For Your Attention Any Questions? 22 Christina Obermaier, Christian Facchi 7. September 2017
Observations on OMNeT++ Real-Time Behaviour
Observations on OMNeT++ Real-Time Behaviour Christina Obermaier, Christian Facchi Research Centre, Technische Hochschule Ingolstadt Email: {christina.obermaier, christian.facchi}@thi.de arxiv:79.227v [cs.ni]
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