Achieving robust message dissemination in vanet challenges and solutions
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Achieving Robust Message Dissemination in VANET: Challenges and Solutions. J. Li and C. Chigan Presented By: Imranul Hoque. Motivation. Real-time collision avoidance Warning technology Road-to-Vehicle Communication Difficult to build infrastructure Existing Inter-Vehicle Communication

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Achieving robust message dissemination in vanet challenges and solutions

Achieving Robust Message Dissemination in VANET: Challenges and Solutions

J. Li and C. Chigan

Presented By: Imranul Hoque


Motivation
Motivation and Solutions

  • Real-time collision avoidance

  • Warning technology

  • Road-to-Vehicle Communication

    • Difficult to build infrastructure

  • Existing Inter-Vehicle Communication

    • Dependent on the infrastructure

  • Challenge: Robust Message Dissemination

  • Solution: Apply MANET algorithms, but …


Challenges
Challenges and Solutions


Robust message dissemination
Robust Message Dissemination and Solutions

  • 100% packet delivery to intended receivers and with acceptable overhead

  • Performance Metrics

    • In-time delivery ratio

    • Delivery time

    • Packet overhead

  • Unbounded Network: Identity based addressing model unfeasible

  • Mobility Pattern: How to forward messages?

  • Sparse Distribution: Partition recovery?


Snapshot
Snapshot and Solutions


Content based addressing
Content Based Addressing and Solutions

  • Content of data packet is used to determine the intended receiver set

  • Model:

    • Data packet pushed to cluster-head

    • Mobile nodes send pull request to cluster-head

  • Intended receiver set defined by: speed, driving status, vehicle type, etc.

  • Issues: Cluster structure, pull process, probe frequency, etc.


Position based addressing
Position Based Addressing and Solutions

  • Vehicles equipped with GPS

  • Example: Send post crash warning to vehicles within a rectangular area (expressed as vectors of latitude and longitude)

  • Issues: GPS, dynamically moving area, etc.




Content base forwarding
Content Base Forwarding and Solutions

  • Based on information filtering

  • If message valuable for traffic safety: accept & rebroadcast

  • Intended receiver & effective range calculated on fly: speed warning on slippery highway should be received by fast driving vehicles


Other forwarding schemes
Other Forwarding Schemes and Solutions

  • Epidemic Routing: Gossip based scheme

  • Hierarchical Cluster Based Forwarding

    • High delivery ratio, low overhead

    • Management of cluster is difficult

  • Directional Flooding


Partition handling
Partition Handling and Solutions

  • Vehicles in other directions

  • Issues: duration of contact, loop


Partition handling 2
Partition Handling (2) and Solutions


Partition handling 3
Partition Handling (3) and Solutions

  • Message Carrier


Conclusion
Conclusion and Solutions

  • Addressing model defines group of intended receivers

  • Accuracy of the definition determines application level delivery ratio

  • Forwarding strategy determines packet overhead and communication level delivery ratio

  • Mobility prediction can be used to select the message carrier to cross the partitions


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