Tomorrow’s In-Car Interconnect? A Competitive Evaluation of IEEE 802.1 AVB and Time-Triggered Ethernet (AS6802) Till Steinbach 1 Hyung-Taek Lim 2 Franz Korf 1 Thomas C. Schmidt 1 Daniel Herrscher 2 Adam Wolisz 3 1 Hamburg University of Applied Sciences {till.steinbach, korf, schmidt}@informatik.haw-hamburg.de 2 BMW Group Research and Technology {hyung-taek.lim, daniel.herrscher}@bmw.de 3 Technische Universität Berlin and University of California, Berkeley [email protected]IEEE 76th Vehicular Technology Conference 4 September 2012, Québec City, Canada R E NET
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Tomorrow’s In-Car Interconnect?A Competitive Evaluation of IEEE 802.1 AVB
and Time-Triggered Ethernet (AS6802)
Till Steinbach1 Hyung-Taek Lim2 Franz Korf1
Thomas C. Schmidt1 Daniel Herrscher2 Adam Wolisz3
1Hamburg University of Applied Sciences{till.steinbach, korf, schmidt}@informatik.haw-hamburg.de
2BMW Group Research and Technology{hyung-taek.lim, daniel.herrscher}@bmw.de
3Technische Universität Berlin and University of California, [email protected]
IEEE 76th Vehicular Technology Conference4 September 2012, Québec City, Canada
RE NET
Hochschule für Angewandte Wissenschaften Hamburg Hamburg University of Applied Sciences
Tomorrow’s In-CarInterconnect?
T. Steinbach
Problem Statement &Motivation
Background &Related Work
Evaluation &Comparison
Conclusion &Outlook
REAgenda
1 Problem Statement & Motivation
2 Background & Related Work
3 Evaluation & Comparison
4 Conclusion & Outlook
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Hochschule für Angewandte Wissenschaften Hamburg Hamburg University of Applied Sciences
Tomorrow’s In-CarInterconnect?
T. Steinbach
Problem Statement &Motivation
Background &Related Work
Evaluation &Comparison
Conclusion &Outlook
REProblem StatementThe heterogeneity of in-car networking
The in-car network grew over the past decadesIncreasing demand continuously requiredintroduction of new technologiesToday, extremely heterogeneous network formed ofdomain specific systems
CAN, FlexRay, MOST . . .
Abstraction layers (e.g. AUTOSAR) introducedinterface to applicationsOn the transport layer still very high complexity
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Hochschule für Angewandte Wissenschaften Hamburg Hamburg University of Applied Sciences
Tomorrow’s In-CarInterconnect?
T. Steinbach
Problem Statement &Motivation
Background &Related Work
Evaluation &Comparison
Conclusion &Outlook
REMotivationWhy should we consider Ethernet?
Ethernet offers:Mature technologyHigh transmission bandwidthLow prices for componentsMany development/diagnostic tools and expertdevelopers
Ethernet considered for (or already used):On-Board Diagnosis (OBD)MultimediaImage transmission (Camera)
But: Ethernet as additional transport technologycannot reduce complexity
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Hochschule für Angewandte Wissenschaften Hamburg Hamburg University of Applied Sciences
Tomorrow’s In-CarInterconnect?
T. Steinbach
Problem Statement &Motivation
Background &Related Work
Evaluation &Comparison
Conclusion &Outlook
REMotivation
What if Ethernet could be used as the medium for auniform homogeneous in-car backbone?
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Hochschule für Angewandte Wissenschaften Hamburg Hamburg University of Applied Sciences
REIEEE 802.1 AVBTime-synchronized low latency streaming through IEEE 802 networks
IEEE 802.1 Audio Video Bridging Protocol suite
Stream Reservation ProtocolOnline signaling protocol for traffic flowsreserves required bandwidth for a specific stream
Queuing and Forwarding RulesBased on IEEE 802.1Q, Mapping of priority valuesto AVB classesStrict Priority Algorithm for Legacy EthernetCredit Based Shaper Algorithm for AVBMaximum latency of 2ms over 7 Hops (Class A) or50ms (Class B)
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Hochschule für Angewandte Wissenschaften Hamburg Hamburg University of Applied Sciences
Bandwidth IEEE 802.1 AVB TTEthernetType [MBit/s] Class (Priority) Class (Priority)TV 10. . . 20 B (Prio 4) RC (Prio 7)Media Audio 8 B (Prio 4) RC (Prio 7)Media Video 40 B (Prio 4) RC (Prio 7)Camera 25 A (Prio 5) RC (Prio 6)Control (3.68. . . 736) · 10−4 A (Prio 5) TT + RC (Prio 0. . . 5)
High bandwidth multimedia traffic flows with lowtiming requirementsHigh bandwidth driver assistance camera trafficflows with medium timing requirementsLow bandwidth control traffic flows with high timingrequirements
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Hochschule für Angewandte Wissenschaften Hamburg Hamburg University of Applied Sciences
Both protocols have almost equally low latency(Latency <100 µs)Synchronous traffic in TTE is most precise(Jitter <4 µs)
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Hochschule für Angewandte Wissenschaften Hamburg Hamburg University of Applied Sciences
Tomorrow’s In-CarInterconnect?
T. Steinbach
Problem Statement &Motivation
Background &Related Work
Evaluation &Comparison
Conclusion &Outlook
REConclusion
Both technologies are able to fulfill the requirementsfor camera and multimedia trafficfor control traffic
With the tree-based topology and today’s amount oftraffic flows the protocols perform almost equallywellLight advantages for Ethernet AVB for multimediaand camera streamsLight advantages for TTEthernet for control traffic
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Tomorrow’s In-CarInterconnect?
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Problem Statement &Motivation
Background &Related Work
Evaluation &Comparison
Conclusion &Outlook
REOutlook
In our ongoing and future work we will . . .. . . analyse how cross-traffic will influence theperformance of the backbone network. . . analyse whether a backbone with coexistence ofboth concepts can improve performance andflexibility
Time-triggered traffic class and strict priorityscheduling for control trafficCredit based shaping and online stream reservationfor multimedia streams
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Tomorrow’s In-CarInterconnect?
T. Steinbach
Problem Statement &Motivation
Background &Related Work
Evaluation &Comparison
Conclusion &Outlook
RETomorrow’s In-Car Interconnect?
Thank you for your attention!
Website of CoRE research group:http://www.haw-hamburg.de/coreWebsite of TTEthernet simulation model:http://tte4inet.realmv6.org
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Tomorrow’s In-CarInterconnect?
T. Steinbach
Problem Statement &Motivation
Background &Related Work
Evaluation &Comparison
Conclusion &Outlook
RELiteratur I
[1] Hyung-Taek Lim et al. “Performance analysis of the IEEE802.1 ethernet audio/video bridging standard”. In:Proceedings of the 5th International ICST Conference onSimulation Tools and Techniques. SIMUTOOLS ’12.Desenzano del Garda, Italy: ICST (Institute for ComputerSciences, Social-Informatics and TelecommunicationsEngineering), 2012, pp. 27–36.
[2] Till Steinbach et al. “An Extension of the OMNeT++ INETFramework for Simulating Real-time Ethernet with HighAccuracy”. In: Proceedings of the 4th International ICSTConference on Simulation Tools and Techniques. SIMUTools’11. Barcelona, Spain: ICST (Institute for Computer Sciences,Social-Informatics and Telecommunications Engineering),2011, pp. 375–382.