Systematic Protocol Design for Vehicular Networks

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Systematic Protocol Design for Vehicular Networks

• Rahul Mangharam, Mark Hamilton, Prof. Raj
  Rajkumar
• Carnegie Mellon University, Pittsburgh, U.S.A.
• Priyantha Mudalige Fan Bai
• General Motors Research Center, Warren, U.S.A.

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Current State of Vehicular Network Design
VANET Hybrid-Simulator
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GrooveNet Protocol Design Approach
Rapid Prototyping
Model Validation
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Protocol Requirements
Bounded Broadcast
Scheduled Latency Storm
Flooding
Message Disconnected Adaptive
Persistence Network
Rebroadcast
End-to-End Rapid Topology ?
Connectivity Changes
Heterogeneous Networks
Alert Zone with delay-sensitive
messages
Warning Zone with persistent messages
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Why do we need Hybrid Simulation?
Vehicle Operations Director (VOD)
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Cellular Link
Cellular Link
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Real Vehicle
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Real Vehicle DSRC Link
Virtual 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

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GrooveNet Hybrid Simulator Design
Event Queue
GrooveNet Simulator Core
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Test Setup
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Boston Case Study
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New York Unbounded Flooding
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New York Geographic Flooding
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Car Following Model
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Traffic Signal Model
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Modular Architecture
Traffic Light Model
Infrastructure Node Model
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On-road Vehicular Networking Platform
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Location Division Multiple Access(Focus for 2007)
Alert Zone
200m Location Slot
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Transmission Time Slots
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 vehicles location
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Adaptive Broadcast for Persistent Messagesin
Warning Zone(Focus for 2007)
Aggressive Rebroadcast (Message Propagation at
Frontier)
Rebroadcast Rate (Hz)
Lazy Rebroadcast (Maintain Connectivity)
Max. Message Propagation Distance (m)
Current vehicles position
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