Exploring the Challenges of Automotive Ethernet - … · Exploring the Challenges of Automotive...
Transcript of Exploring the Challenges of Automotive Ethernet - … · Exploring the Challenges of Automotive...
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V1.2 | 2016-05-30
Sept 27th 2017, Vector UK Conference
Exploring the Challenges of Automotive Ethernet
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Introduction
Introduction
Physical layers
Ethernet vs. Traditional Bus Systems
Use-oriented protocols
Time-Sensitive Networking (TSN)
Challenges
Validation Challenges
Summary
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Simple Question! What are you doing?
Wired Acronyms And Terms
Introduction
802.3bp
RTPGE
802.3bw
802.3bv
1TPCE
1000BASE-T1
100BASE-T1
BroadR-Reach
OABR
OPEN
Ethernet
IP
IEEE
GBPOF
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IEEE 802.3 Task Force names
Wired Acronyms And Terms – Let’s Sort The Terms
Introduction
802.3bp
RTPGE
802.3bw
802.3bv
1TPCE
1000BASE-T1
100BASE-T1
BroadR-Reach
OABR
OPEN
Ethernet
IP
IEEE
GBPOF
1TPCE = One (1) Twisted Pair 100 Megabit (C = century = 100) Ethernet
RTPGE = Reduced Twisted Pair Gigabit Ethernet
GBPOF = Gigabit Ethernet Over Plastic Optical Fiber
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IEEE 802.3xx Name of a project within an IEEE Working Group
Wired Acronyms And Terms – Let’s Sort The Terms
Introduction
802.3bp
RTPGE
802.3bw
802.3bv
1TPCE
1000BASE-T1
100BASE-T1
BroadR-Reach
OABR
OPEN
Ethernet
IP
IEEE
GBPOF
bw = One (1) Twisted Pair 100 Megabit (C = century = 100) Ethernet
bp = Reduced Twisted Pair Gigabit Ethernet
bv = Gigabit Ethernet Over Plastic Optical Fiber
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Name of the physical layer
Wired Acronyms And Terms – Let’s Sort The Terms
Introduction
802.3bp
RTPGE
802.3bw
802.3bv
1TPCE
1000BASE-T1
100BASE-T1
BroadR-Reach
OABR
OPEN
Ethernet
IP
IEEE
GBPOF 100BASE-T1 = 100 Megabit Baseband One Pair
1000BASE-T1= 1 Gigabit Baseband One Pair
T.B.D = Gigabit Ethernet Over Plastic Optical Fiber
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Organizations and Technology
Wired Acronyms And Terms – Let’s Sort The Terms
Introduction
802.3bp
RTPGE
802.3bw
802.3bv
1TPCE
1000BASE-T1
100BASE-T1
BroadR-Reach
OABR
OPEN
Ethernet
IP
IEEE
GBPOF OABR, (OPEN Alliance) BroadR-Reach
Early name for 100BASE-T1 when IEEE has not been involved and OPEN Alliance introduced Broadcom’s BroadR-Reach technology to the automotive world.
OPEN, OPEN Alliance = One Pair Ethernet Network Alliance
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Organizations
Introduction
One Pair Ethernet Network Alliance
“One voice” from the automobile industry
Two types of membership
Promoters (~16)
Adopters (~299)
Hosts 12 Technical Committees (TC)
Address all open items, not harmonized within other documents. E.g. compliance tests, interoperability tests, minimum requirements, …
Institute of Electrical and
Electronics Engineers
802.3 „Home“ of Ethernet
ISO 21111
Road vehicles –
In-vehicle Ethernet
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Separate Areas of Activity
Introduction
“Channel”
15 meter
Single UTP
EMC
…
PHY MAC MAC PHY
3 Network
4 Transport
5 Session
6 Presentation
7 Application
2 Data Link
1 Physical
3 Network
4 Transport
5 Session
6 Presentation
7 Application
2 Data Link
1 Physical
Confo
rmance/I
nte
ropera
bility t
ests
Confo
rmance/I
nte
ropera
bility t
ests
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Physical layers
Introduction
Physical layers
Ethernet vs. Traditional Bus Systems
Use-oriented protocols
Time-Sensitive Networking (TSN)
Challenges
Validation Challenges
Summary
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IEEE 100Base-TX
Physical layers
100Base-TX
PHY
100Base-TX
PHY
MDI
100 Mbit/s
FULL DUPLEX
ECU 1 ECU 2
MDI
Tx Rx Tx Rx
Coding/Decoding:
NRZI, 4B5B, MLT-3
Clock recovery/Synchronization:
Each path is activated by transmitter
Synchronization is done continuously
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IEEE 1000Base-T
Physical layers
MASTER
1000Base-T
PHY
SLAVE
1000Base-T
PHY
MDI
1000 Mbit/s
FULL DUPLEX
ECU 1 ECU 2
MDI
Coding/Decoding:
4D-PAM5, 8B1Q4
Clock recovery:
Master-slave behavior
Role is configured or negotiated
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Open Alliance BroadR-Reach
Physical layers
MASTER
BroadR-Reach
PHY
MDI
SLAVE
BroadR-Reach
PHY
MDI
100 Mbit/s
FULL DUPLEX
ECU 1 ECU 2
UTP: Unshielded Twisted Pair
Coding/Decoding:
4B3B, 3B2T, PAM3
Clock recovery/Synchronization:
Master-slave behavior
Configured in PHY
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Open Alliance BroadR-Reach
Physical layers
MASTER
BroadR-Reach
PHY
MDI
SLAVE
BroadR-Reach
PHY
MDI
100 Mbit/s
FULL DUPLEX
ECU 1 ECU 2
UTP: Unshielded Twisted Pair
Coding/Decoding:
80B/81B, 3B2T, PAM3
Clock recovery/Synchronization:
Master-slave behavior
Configured in PHY
Parity bits part of forward error correction
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Ethernet vs. Traditional Bus Systems
Introduction
Physical layers
Ethernet vs. Traditional Bus Systems
Use-oriented protocols
Time-Sensitive Networking (TSN)
Challenges
Validation Challenges
Summary
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Switched Networks
Ethernet vs. Traditional Bus Systems
CAN
ECU #B ECU #C ECU #A
Ethernet
ECU #A ECU #B ECU #D
Switch Switch
ECU #C
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Ethernet as High-speed Connection
Ethernet vs. Traditional Bus Systems
CAN
Ethernet
ECU #A ECU #B ECU #C
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MAC MAC
Connecting Networks – IP vs. MAC
Ethernet vs. Traditional Bus Systems
Ethernet
ECU #A ECU #B ECU #D
Switch Switch Ethernet
ECU #A ECU #B ECU #D
Switch Switch
Gateway/Router
Gateway/Router
IP
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Frames And Efficiency
Ethernet vs. Traditional Bus Systems
Identifier Length Payload
0 … 8/64 Byte Checksum
CAN/CAN FD Data Frame*
Destination MAC-Address
Source MAC-Address
Type-Field Payload
42 … 1500 Byte
Ethernet Packet*
Checksum
min. 64 Byte
13% at 8 Byte
98% at 1500 Byte
min. ~6 Byte
57% at 8 Byte
Used Bandwidth
* simplified
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Use-oriented protocols
Introduction
Physical layers
Ethernet vs. Traditional Bus Systems
Use-oriented protocols
Time-Sensitive Networking (TSN)
Challenges
Validation Challenges
Summary
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SOME/IP: Scalable Service-Oriented Middleware over IP
Use-oriented protocols
1
2
3
4
5
6
7
Ethernet PHY
Ethernet MAC +
VLAN
IPv4/IPv6
TCP/UDP
SOME/IP
Service
Control/Discovery
Application areas:
> SOME/IP-SD: SOME/IP Service Discovery
> SOME/IP: Service-oriented data transmission for controlled communication
Sig
nal-
based
Receiver
Sender Sig val A Sig val A Sig val A Invalid
Value available
t
Event val A
Event val A Event val A Subscribe
Serv
ice-b
ased
Client
Server t
Published Signal
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DoIP: Diagnostics over IP
Use-oriented protocols
1
2
3
4
5
6
7
Ethernet PHY
Ethernet MAC +
VLAN
IPv4/IPv6
TCP/UDP
DoIP
Diagnostics and
Flash Update
Application areas:
> Diagnostics over Ethernet and IP
> Flash programming
Description file: CDD, ODX, etc.
Tester needs a description file for each ECU
Logical address:
For each ECU and Tester an own logical address has to be defined
UDP/IP or TCP/IP:
Layer 3: IP addresses (e.g. 192.168.1.10)
Layer 4: UDP/TCP ports (e.g. 13400)
GW Door
Roof Seat
CAN
Tester
Tester
Ethernet Activation
Line
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XCP: Universal Measurement and Calibration Protocol
Use-oriented protocols
1
2
3
4
5
6
7
Ethernet PHY
Ethernet MAC +
VLAN
IPv4/IPv6
TCP/UDP
XCP
Measurement and
Calibration
Application areas:
> Measurement (asynchronous/synchronous)
> Calibration (adjusting/parameterizing)
> Flash programming
Description file: A2L
> Describes memory addresses and available objects of an ECU
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AVB: Audio Video Bridging
Use-oriented protocols
1
2
3
4
5
6
7
Ethernet PHY
Ethernet MAC +
VLAN
AVB
Audio/Video
Time Sync
Application area:
> Time synchronous data transmission
> Assured worst case latency for data transmission
> Priority controlled data transmission
Needs Ethernet Frames or VLAN Frames:
> Various Ethernet Type: e.g. 0x88F7 (gPTP)
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Time-Sensitive Networking (TSN)
Introduction
Physical layers
Ethernet vs. Traditional Bus Systems
Use-oriented protocols
Time-Sensitive Networking (TSN)
Challenges
Validation Challenges
Summary
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It began with the IEEE standardization out of the
Audio/Video Bridging Task Group, specifying the basis for low latency transmission on Ethernet > IEEE 802.1BA "Audio Video Bridging (AVB) Systems"
> IEEE 802.1AS "Timing and Synchronization for Time-Sensitive Applications (gPTP)"
> IEEE 802.1Qav "Forwarding and Queuing for Time-Sensitive Streams (FQTSS)"
> IEEE 802.1Qat "Stream Reservation Protocol (SRP)"
and standards for time sensitive applications > IEEE 1722 "Layer 2 Transport Protocol (AVTP)"
> IEEE 1733 "Layer 3 Transport Protocol (RTP)"
What is TSN – It began with AVB …
Time-Sensitive Networking (TSN)
T3 T2 T1 Presentation Time
Time Sensitive Data
Best Effort Data
T2 T1 T3
? T3 T2 T1 T1 TG <
TG TG
Tx Rx
Idle Slope
Send Slope
Credit Based Shaper
- +
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The IEEE Time-Sensitive Networking Task Group as the successor of the AVB Task Group
specifies the basis for deterministic transmission on Ethernet > IEEE 802.1Qbv "Enhancements for Scheduled Traffic"
and standards for latency reduction > IEEE 802.1Qbu "Frame Preemption"
> IEEE 802.3br "Specification and Management Parameters for Interspersing Express Traffic"
and standards for Safety and Security > IEEE 802.1CB "Frame Replication and Elimination for Reliability"
> IEEE 802.1Qci "Per-Stream Filtering and Policing"
What is TSN – … and has been extended to TSN
Time-Sensitive Networking (TSN)
Deterministic Data
Non Deterministic Data
S2 S1 S3
Time Aware Shaper
Time Slot
Tx Rx
TG
TG
Gate Gate Control List
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Challenges
Introduction
Physical layers
Ethernet vs. Traditional Bus Systems
Use-oriented protocols
Time-Sensitive Networking (TSN)
Challenges
Validation Challenges
Summary
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The “Real” Challenges When Introducing Ethernet
Challenges
CAN Ethernet
LIN
FlexRay
pWLAN
MOST
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Change in bus concept – point to point networking rather than bus topology
Topology ( Star , Daisy Chain or combination)
Ethernet Switches and configuration
ARL configuration – needs time at the start up if configured to work dynamically
VLAN concept usage
Domain based – will also affect switch configuration
Security
Will affect the VLAN concept ( tester only can see DoIP VLAN)
TLS – transport layer security ( TCP/UDP)
Variety of different protocols
Service oriented data transmission
Dynamic data serialisation in SOME/IP for complex data streams
Complexity – too much information
Challenges with the Ethernet implementation
Challenges
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Validation Challenges
Introduction
Physical layers
Ethernet vs. Traditional Bus Systems
Use-oriented protocols
Time-Sensitive Networking (TSN)
Challenges
Validation Challenges
Summary
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Many new protocols
Bigger challenge for test tool vendors
Interoperability testing (e.g. OPEN TC8)
Extracting the data out of Ethernet network
Mirroring monitoring port
Tap the link
Robustness testing
Fault Injection at the different layers
Availability of valid Database ( ARXML )
AUTOSAR Adaptive
Requirements for software integration testing
Many data sources for autonomous features in the car
Cameras, Radar, Lidar as well as V2x
Sensor fusion algorithm have to be developed and tested in this complex scenarios
Validation and Verification Challenges
Validation Challenges
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Managing big data
Validation and Verification Challenges
Validation Challenges
25 GB/s AURORA
AURORA
DAP
NEXUS
JTAG
XCPonEth
CANape
2 x 100 MB/s
100 Mbs/s
CANoe 200 Mbs/s
Filtering of Parameters
Filtering of Frames
Calibration Testing/Monitoring
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Selecting the BroadR-Reach for correct reasons
Careful assessment of your requirement before choosing TSN
Choosing the suitable application layer protocol
Keeping the validation challenges in mind while designing the network
Extracting the data out of Ethernet network
Data Safety and Security part of the Ethernet design
Summary
Summary
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