Kohei OHTA

1
Monitoring vehicles The potential and the
challenge

• Kohei OHTA

2
Introduction

• Connect CARs with Internet
• Seamless connectivity
• Connect to World
• Connect to various personal equipments
• Many new technologies available
• MIPv6
• Auto configuration
• Ad-hoc networking
• Many NEW mobile applications for CARs
• Road service
• On-line customer service

3
Probe Car project

• Develop new applications with car related
  information like
• Velocity, Acceleration
• GPS information
• Winker status
• Wiper status
• Etc

How to collect these information?
4
Requirements for information collection from Cars

• Security
• Protect privacy information
• Standardization
• Naming
• Common scheme and methods the various types of
  information
• Transport protocol
• Tough transport protocol under wireless
  environment
• Efficiency
• High resolution and row bandwidth transport

5
Security

• There are many privacy sensitive information in
  cars
• Geographical location
• Velocity
• Passengers
• Etc
• Strong security mechanism is required
• Encryption
• Authentication
• Access control

6
Standardization

• Naming
• To support multi vendor environment, common
  scheme to specify a information item.
• For example, we have to be able to access vehicle
  velocity from any vendors car with SAME method.
• Transport
• Simple and tough transport protocol is suitable
  for mobile wireless environment

7
Efficiency

• Mobile wireless environment is worse than wired
  network
• Connectivity is NOT guaranteed at all
• There is less chance of stable connectivity
• The bandwidth is often narrow
• It is difficult to collect high resolution
  information in such environment
• UDP is preferable to TCP
• Effective aggregation for high resolution with
  less bandwidth under unreliable line

8
Applicability of SNMPv3 1

• Information collection in TCP/IP is
• Basic issue for network management
• That is already existing
• There are many management information for various
  networked devices and applications, router,
  switch, server, printer, and so on
• Well standardized

9
SNMPv3 has

• For Privacy
• DES/AES encryption support
• For authentication
• Multiple user support
• MD5/SHA1 digital signature
• Key management
• Different key management with single pass phrase
• For access control
• Allow access to iitsVehicleVelocity from center
  ADeny access to iitsLongitude from service
  center BDeny access to iitsLatude from service
  center B
• Strandardization
• Well standardized consistent naming scheme
• .1.3.6.1.4.1.282.16.108.1.3.3.3 iitsVehicleVelocit
  y
• Transport
• Connectionless UDP
• Per packet authentication/encryption

10
Current configurations
Information collection center
Encrypted
A
IPv6
Information collection center
Velocity
B
Logitude
Latitude
Defined as MIB in ASN.1
Winker
Wiper status
11
Polling and Trap

• There are two modes in SNMP to collect
  information
• Polling is good to collect periodic data
• Trap is good to notify a event

12
For effectivenessSNMP Packet Payload
13
Polling at small intervals
time
PDU SIZE 60 (length (Name) length(Value))
Length(Name) 12
length (Value) 6
60 (12 6 ) 1.08K bytes !!
14
Time-based (History) Aggregation MO
MO n values of ifInOctets.1 interval I
PDU SIZE 60 length(Value))
length (Value) 6
60 6 360 bytes !!
15
Evaluation - Data Retrieval Time
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Evaluation Management Traffic
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Evaluation - CPU Usage
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For reliable information collection

• Data collection with SNMP has been based on
  Polling
• Mobile node is often disappeared from data
  collector because of the physical condition and
  occasional shadowing.
• Data collector can not know and control the
  connectivity to mobile node.
• Conventional polling based data collection no
  longer work well.