Transcript In-Vehicle Routing Requirements in Low Power and Lossy Networks Ryuji Wakikawa Hiroshi Kuwabara

In-Vehicle Routing Requirements in Low Power and
Lossy Networks
Ryuji Wakikawa
Hiroshi Kuwabara
Toyota InfoTechnology Center Co., Ltd.
ROLL Working Group IETF 72
Why in-vehicle networks

Current in-vehicle networks*
 In vehicles, wired harness have about 4000 parts, weight
as much as 40kg. It includes more than 1900 wires for up
to 4km.
 Automotive sensor market volumes exceed 665 million
units in USA and 2237 million units in global
*Intra-vehicular Wireless Networks by M. Ahmed, M. Ames*, T. ElBatt+, C. Saraydar*, T. Talty*, J. Yin, AutoNet 2007,
HRL Laboratories, USA; *General Motors R&D, USA; +San Diego Research Center, USA; and #TrellisWare Technologies, USA

Why wireless?
 Easy placement



tire pressure monitor sensors
Removing cables from vehicles
Cost of cabling inside a vehicle
ROLL Working Group IETF 72
Characteristics and Requirements

ECU (Electronic Control Unit),
Actuator, Sensor are all connected
by several dedicated BUS systems in
an automobile.
 CAN (Control Area Network), LIN
(Local Interconnect Network),
FlexRay, MOST
 Power Train, Chassis, Body,
Infotainment, Drive Assistance
Networks

Characteristics of in-vehicle network
 High density (piles of sensors,
ECUs, actuators)
 Wired/Wireless integrated
networks
 Obstacles(!) inside a vehicle



Routing Requirements
 Low Power
 Path Reliability
 Subnet Support
 QoS Support
 Scalability
 Latency
 Network Convergence
(Wired/Wireless)
 Manageability
 Mobility
 Security
passengers, ski board, bicycle, etc.
long-term lifecycle
ROLL Working Group IETF 72
Example Activity in Automotive Industry
ROLL Working Group IETF 72
Zigbee Propagation Measurement
Estima (Previa named in USA) (MPV 1Box type) Hybrid
 Topology : Peer to Peer (Coordinator and End Device)
 CH ： 26ch fix （2480 ± 1 MHz don’t conflict 802.11b/g )
 Tx Power ： 4dBm, Tx Packets ： 80bytes X 100 times

ROLL Working Group IETF 72
Zigbee Communication Measurement
Cabin
1st1Roof
042B
042C
0572
0573
2ndRoof
040E
Steering
1stRight
Instrument Panel
042D
2ndRight
0563
3rdRight
0568
1stLeft
0431
ZC
2ndLeft
056C
Coordinator
ZR
3rdLeft
Router
ZED
0449
Back end
ROLL Working Group IETF 72
End Device
Zigbee Communication Measurement
Engine Room
Instrument Panel
0572
Engine
0432
0426
Engine
Middle Up
Engine
Right Low
0428
Engine
Middle Low
043D
Engine
Left Low
Inverter Module
ROLL Working Group IETF 72
References

Intra-vehicular Wireless Networks, M. Ahmed, M. Ames*,
T. ElBatt+, C. Saraydar*, T. Talty*, J. Yin, AutoNet 2007

Design And Realization of An IP-Based In-Car Network
Architecture, Rainer Steffen, et.al, ISVCS 2008
ROLL Working Group IETF 72