cooperative protocols for wireless vehicular communication
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
Fatma Hrizi, Jerome Haerri and Christian Bonnet
EURECOM, Mobile communications department
Cooperative protocols for Cooperative protocols for wireless vehicular wireless vehicular
communicationcommunication
Vehicular networks: The ChallengesVehicular 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…
04/22/23 EURECOM, Mobile communications department
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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
Cooperation in vehicular networks Cooperation in vehicular networks (1/2)(1/2)
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3
Load on channel
Need to regulate the channel load
Channel capacity exceeded!
Cooperation in vehicular networks Cooperation in vehicular networks (2/2)(2/2)
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4
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
Best relay to be selected
If B does not retransmit => reduce channel load
at A
A
B
AB
Reduce channel load at
B
Does not impact channel load at A
No need for B retransmission
C
Talk outlineTalk outline
Cooperative congestion control strategiesMulti-hop communication
Bi-Zone Broadcast protocol (BZB)One-hop communication
Transmission rate control
Conclusion and perspectives
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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
Multi-hop communication: BZBMulti-hop communication: BZB
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Dth
Tx Range
Impact of RSU in dissemination
A
B
C
D
tA sends B sends
C cancels D cancels
BD
C
Dth: Distance threshold
BZB: Performance EvaluationBZB: Performance Evaluation
500 nodes500 nodes50 50 nodesnodes
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SDP: Simple distance based protocol
One-hop communication: Transmission One-hop communication: Transmission rate controlrate 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
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tTmax
TransmissionApplication requirement!
Tmax
TransmissionI moved from predicted position!
Predicted position
Realposition
Intersection collision warning
Tmax: Maximum Tx period
Transmission!
Transmission rate control: Transmission rate control: ArchitectureArchitecture
Kalman Filter Simplistic assumptions: linear problem with Guassian noise
Neural Network Learning phase
Kalman Filter Neural Network Genetic algorithm Particle Filter
GPS data
V2X data
Map data
Decision
Mobility Prediction system
CooperativeDecision maker
Predicted data
Real Position data
Error
Transmit position?
ApplicationRequirements
Network density
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Genetic algorithm Processing time No guarantee for convergence
Particle Filter Degeneracy problem
Conclusion and perspectivesConclusion and perspectives So far..
Congestion-aware approach for multi-hop and one-hop communicationsBZB protocolTransmission rate control
Some issues have not yet been fully investigatedMobility prediction schemesChannel-aware mechanisms for congestion control strategies Cooperation between multiple applications and protocols
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Multiple applicationsSatisfy different applications requirements
Multiple protocolsConsider the various congestion control policies and resources limitation
Conclusion and perspectivesConclusion and perspectives
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Intersection collision warning
(ICW)!
Lane change warning (LCW)!
(1)
(2)Which decision I
take?
Applications
ICW LCW … Appn
Facilities
Networking & Transport
CP1 CP2 CPn
Access Technologies
…Which congestion control scheme I
use?ICW: Intersection collision warningLCW: Lane change warningCP: Congestion control policy
Thank you for your attentionThank you for your attention
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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 : [email protected]
Multi-hop communication: BZBMulti-hop communication: BZB
V2V disseminationContention-based scheme
Minimise the waiting time of distant node
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Dth
Tx Range
dthdwhereTTrandom
dthdwhereTrandomewaitingtim
upperlower
upper
),(
),0(
V2V/V2I dissemination: Impact of infrastructure in message disseminationRSUs are equipped with high antennas ensuring more
coverage and are wiredly connected to the TOCMore priority to RSU considering density
Multi-hop communication: I-BZBMulti-hop communication: I-BZB
RSUannotIf
RSUanIfNK
TTrandomKewaitingtim
neigh
upperlower
1
/1
),(
04/22/23 14EURECOM, Mobile communications department