VIIC POC Message Set Usage

1
VIIC POC Message Set Usage

• Chris Hedges
• Delphi Corporation

2
Message Tools

• Message Set described in ASN.1 (J2735v15
  additions)
• Non-Safety messages used Basic Encoding Rules
  (BER)
• No tools were available for Implicit Encoding
• Implicit Encoding by hand is not preferred
• Good BER cross-vendor tool compatibility
• BER tools were cost competitive vs. other tools
  (PER, etc.)
• For interoperability, OSS chosen as exclusive
  tool supplier
• BAH compiled a common library for all developers
  to use
• All Message Java and C classes stored in common
  database
• Ensured interoperability between OBE and Network
  Developers
• OSS Nokalva Encoder/Decoder runtimes
• Ensured interoperability between OBE and Network
  Developers

3
SAE J2735 Messages implemented for POC

• In-Vehicle Signage Messages
• TRAVELER_ADVISORY
• ROAD_SIGN
• Traffic Probe Message
• PROBE_VEHICLE_DATA
• PROBE_DATA_MANAGEMENT
• BASIC_SAFETY_MESSAGE
• SIGNAL_PHASE_AND_TIMING
• GID_MAP

Detailed in this Presentation
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In-Vehicle Signage DSRC Setup

• WSMs broadcast from RSE to OBEs
• UNSIGNED PSIDs
• 0x02100001 Conditions Advisories Traffic Delays
  Status
• 0x02110001 Conditions Advisories Weather
  Conditions
• 0x02120001 Convenience Advisories Roadside
  Services
• 0x02130001 Convenience Advisories Food Services
• 0x02140001 Convenience Advisories Vehicle
  Services
• 0x02150001 Convenience Advisories Lodging
  Services
• SIGNED PSIDs
• 0x02020001 Safety Advisories Roadway Condition
• 0x02030001 Safety Advisories Civil Emergency
• 0x02040001 Safety Advisories Cautions
• 0x02010001 Safety Advisories Road Incident

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Traveler Advisory Message
DSRCmsgID
PacketID
Primary ITIS Code
Wave Short Message

Header
Advisory (1)
Advisory (2)
Advisory (32)
Advisory ID
Valid Time
Description
Advice
Forecast Flag
Link
priority
ITIS code (or Text)
ITIS code (or Text)
Road name
ITIS code (or Text)
ITIS code (or Text)
Starting road
ITIS code (or Text)
ITIS code (or Text)
Direction affected
Lanes affected
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Road Sign Message
MUTCD code
PacketID
DSRCmsgID
Wave Short Message
Header
Sign (1)
Sign (2)

Sign (32)
3D location
Valid Region 1
View Angle
Valid Time
Valid Region n

content
Exit Service
Exit number
WorkZone
ServiceInfo (1)
posted speed
restricted speed
Valid Time
Text
Speed Limit

INTEGER (m/s)
ServiceInfo (32)
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Beyond POC Combined Message
8
Traffic Probe DSRC setup

• Probe Snapshot PSID (0x03000000)
• Initial POC Transmission Scheme
• Wave Short Message (OBE -gt RSE)
• Signed
• Due to Path Imbalance, messages sent using VDTLS
• Vehicular Datagram Transport Layer Security
• VDTLS client/server provided Telcordia
• Probe Management PSID (0x03000001)
• Wave Short Message (RSE -gt OBE)
• Signed

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Probe Snapshot Message
DSRCmsgID
PositionVector
VehicleType
Header
Snapshot1
Snapshot2
Snapshot3
Snapshot4
VDTLS packet
PSN
PositionVector
Temp ID
Wipers
Brakes

• Time
• 3D Position
• Heading/Speed

Vehicle Data Elements
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Probe Management Message
Wave Short Message
Start speed Stop speed Stop time Stop lag
Header
Sample
Heading
Termination Method
Collection Method
Start- Stop
Transmit Interval
Sensor Thresholds
Time or Distance
Time or Distance
Filters on final octet of MAC (Start/End)
Wiper Threshold
Brakes Threshold

Vehicle Data Thresholds
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Typical Probe Snapshot Generation

• Below 20 mph 4 seconds
• 20 to 60 mph linearly interpolated
• Above 60 mph 20 seconds
• 70mph (2053 ft.)
• 60mph (1,750 ft.)
• 50mph (1172 ft.)
• 40mph (703 ft.)
• 30mph (352 ft.)
• 20mph (116 ft.)