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Cooperative protocols for wireless vehicular communication

Cooperative protocols for wireless vehicular communication. Fatma Hrizi, Jerome Haerri and Christian Bonnet EURECOM, Mobile communication s department. Vehicular networks: The Challenges. Applications Safety Efficiency Entertainment, Internet access Key concept

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Cooperative protocols for wireless vehicular communication

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  1. Cooperative protocols for wireless vehicular communication Fatma Hrizi, Jerome Haerri and Christian Bonnet EURECOM, Mobile communications department

  2. Vehicular networks: The Challenges • Applications • Safety • Efficiency • Entertainment, Internet access • Key concept • Provide appropriate information to the driver/vehicle • Large amount of data to exchange • Local scope information: Awareness (GPS data) • Global scope information: Emergency, traffic and road information… EURECOM, Mobile communications department

  3. Cooperation in vehicular networks (1/2) • Safety applications requirements • Short delay and high reliability • Awareness: • Broadcast – need to reach all neighboring nodes • Periodic – need to update position information • Shared medium limitation • Congestion at medium access • Collision at reception Channel capacity exceeded! Load on channel • Need to regulate the channel load EURECOM, Mobile communications department

  4. Cooperation in vehicular networks (2/2) Best relay to be selected Does not impact channel load at A A B C A If B does not retransmit => reduce channel load at A B No need for B retransmission Reduce channel load at B • Congestion control policy of a node benefits others • Need for cooperative and common congestion control policy • One hop transmission • Transmission rate control • Transmission power control • Multi-hop transmission • Select best relay EURECOM, Mobile communications department

  5. Talk outline • Cooperative congestion control strategies • Multi-hop communication • Bi-Zone Broadcast protocol (BZB) • One-hop communication • Transmission rate control • Conclusion and perspectives EURECOM, Mobile communications department

  6. Multi-hop communication: BZB • Disseminate broadcast information reliably and in brief delay • Distance-based contention scheme • Select the best relay according to the distance: the furthest • Minimize the waiting time of distant node Tx Range Dth Dth: Distance threshold C C A D B D B D cancels C cancels Impact of RSU in dissemination t B sends A sends EURECOM, Mobile communications department

  7. BZB: Performance Evaluation SDP: Simple distance based protocol 50 nodes 500 nodes EURECOM, Mobile communications department

  8. One-hop communication: Transmission rate control • Approach: • Tune rate to avoid congestion • Rely on position information prediction • Transmit only when • Mobility not predictable: Sudden mobility change • Topology not predictable: Announce its presence Intersection collision warning Transmission I moved from predicted position! Predicted position Real position Transmission! Transmission Application requirement! t Tmax: Maximum Tx period Tmax Tmax EURECOM, Mobile communications department

  9. Transmission rate control: Architecture Error • Kalman Filter • Simplistic assumptions: linear problem with Guassian noise • Neural Network • Learning phase Network density Application Requirements GPS data Real Position data Decision V2X data Cooperative Decision maker Transmit position? Map data Mobility Prediction system Predicted data • Kalman Filter • Neural Network • Genetic algorithm • Particle Filter • Genetic algorithm • Processing time • No guarantee for convergence • Particle Filter • Degeneracy problem EURECOM, Mobile communications department

  10. Conclusion and perspectives • So far.. • Congestion-aware approach for multi-hop and one-hop communications • BZB protocol • Transmission rate control • Some issues have not yet been fully investigated • Mobility prediction schemes • Channel-aware mechanisms for congestion control strategies • Cooperation between multiple applications and protocols EURECOM, Mobile communications department

  11. Conclusion and perspectives • Multiple applications • Satisfy different applications requirements • Multiple protocols • Consider the various congestion control policies and resources limitation (1) Intersection collision warning (ICW)! Applications Appn LCW … ICW Which decision I take? (2) Lane change warning (LCW)! Facilities Networking & Transport CPn CP1 CP2 … Which congestion control scheme I use? Access Technologies ICW: Intersection collision warning LCW: Lane change warning CP: Congestion control policy EURECOM, Mobile communications department

  12. Thank you for your attention Contact : Fatma Hrizi Mobile Communications Department EURECOM 2229 Route des Crêtes - BP 193 F-06904 Sophia Antipolis Cedex FRANCE Tel: +33-493.00.82 68 Fax: +33-493.00.82 00 Email : fatma.hrizi@eurecom.fr EURECOM, Mobile communications department

  13. Multi-hop communication: BZB V2V dissemination • Contention-based scheme • Minimise the waiting time of distant node Tx Range Dth EURECOM, Mobile communications department

  14. Multi-hop communication: I-BZB V2V/V2I dissemination: Impact of infrastructure in message dissemination • RSUs are equipped with high antennas ensuring more coverage and are wiredly connected to the TOC • More priority to RSU considering density EURECOM, Mobile communications department

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