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GM-CMU Collaborative Research Laboratory
Systematic Protocol Design for Vehicular Networks
Rahul Mangharam, Mark Hamilton, Prof. Raj RajkumarCarnegie Mellon University, Pittsburgh, U.S.A.
Priyantha Mudalige & Fan BaiGeneral Motors Research Center, Warren, U.S.A.
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GM-CMU Collaborative Research Laboratory
Current State of Vehicular Network Design
Network Simulators
ns2 Network Simulator
ITS Simulators
CORSIM Micro-simulation
VISSIM
TRANSIMS
VANET Hybrid-Simulator
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GM-CMU Collaborative Research Laboratory
GrooveNet Protocol Design ApproachPHASE I
Protocol Requirements
Initial Design with Analytical Bounds
Simulation with Behavioral Analysis PHASE II
On-Road Test Implementation
Prototype I Prototype II
After-Market & OEM Design
Rapid Prototyping
Model Validation
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GM-CMU Collaborative Research Laboratory
Protocol Requirements
Alert Zone with delay-sensitive messages
Warning Zone with persistent messages
Protocol Goal ProblemSolution
Approach
Safety
Traffic Reporting
Telematics
Bounded Broadcast Scheduled Latency Storm Flooding
Message Disconnected Adaptive Persistence Network Rebroadcast
End-to-End Rapid Topology ? Connectivity Changes
Heterogeneous
Networks
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GM-CMU Collaborative Research Laboratory
Why do we need Hybrid Simulation?
Real VehicleDSRC Link
Real VehicleVirtual Vehicles (Simulated on VOD)V0 V1 V2 V3 V4 …. Vn-1 Vn
Key Benefits•Scaling Effects - Observe impact of Traffic Density•Remote Monitoring of On-road Experiments •Rapid Prototyping – Same models from Simulation to Deployment•Model Validation – Evaluate Correctness
Vehicle OperationsDirector (VOD)
Cellula
r Link
Cellular Link
1
2
3
4
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GM-CMU Collaborative Research Laboratory
On-board Diagnosis OBD-II Event Trigger DGPS Positioning
GrooveNet Hybrid Simulator Design
Map Database (ASCII)
Log Files
Network Visualization
DSRC 802.11 1xRTT EVDO
Vehicle-to-Vehicle Network Interfaces
Simulator Test File
GrooveNet Simulator Core
Mob
ility
Mod
el
Trip
Mod
el
C
ar M
odel
Net
wor
k M
odel
Oth
er M
odel
s
GrooveNet Topology Graph (binary)
Event Queue
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GM-CMU Collaborative Research Laboratory
Test Setup
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GM-CMU Collaborative Research Laboratory
Boston Case Study
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GM-CMU Collaborative Research Laboratory
New York – Unbounded Flooding
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GM-CMU Collaborative Research Laboratory
New York – Geographic Flooding
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GM-CMU Collaborative Research Laboratory
Car Following Model
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GM-CMU Collaborative Research Laboratory
Traffic Signal Model
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GM-CMU Collaborative Research Laboratory
Modular Architecture
Car ModelGPS Mode
Simulator Mode
Network Mode
Random Waypoint
Visualizer Map Visual
Car List Visual
PHY ModelSimple PHY
Collision PHY
Multi-Channel PHY
Comm. & Link Model Adaptive Re-broadcast
Groove Re-broadcast
Mobility ModelFixed Mobility
Street Speed
Uniform Speed
Car Following
Traffic Light Model
Infrastructure Node Model
Trip ModelRandom Walk
Djikstra
Sightseeing
ModelManager
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GM-CMU Collaborative Research Laboratory
On-road Vehicular Networking Platform
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GM-CMU Collaborative Research Laboratory
Location Division Multiple Access(Focus for 2007)
200m Location Slot
1 2 3 4 1 2
Transmission Time Slots
Alert Zone
GOAL: Achieve Bounded End-to-End Latency in Alert Zone (500-1,500m)
Using GPS PPS (Pulse Per Second) – sub 30ms delay per hop
We impose a TDMA schedule based on the vehicle’s location
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GM-CMU Collaborative Research Laboratory
Adaptive Broadcast for Persistent Messagesin Warning Zone
(Focus for 2007)
Max. Message Propagation Distance (m)
Current vehicle’s position
Rebroadcast Rate (Hz)
Aggressive Rebroadcast(Message Propagation at Frontier)
Lazy Rebroadcast(Maintain Connectivity)
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GM-CMU Collaborative Research Laboratory
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GM-CMU Collaborative Research Laboratory
Real Vehicles in vicinity
Real Vehicles
Simulated Vehicles Simulated Vehicles
Network Connections with Real Vehicles
Real Network Connectivity