Information Propagation Speed in Bidirec tional Vehicular Delay Tolerant Networks
Infocom 2011
Introduction
• Analysis the information propagation speed in bidirectional vehicular delay tolerant networks on highways.
– A threshold(phase transition)
• Vehicular speed v.s dramatically propagation
– Exact expression
• A model based on Poisson point process on co ntinuous space, finite and infinite radio propag ation speed.
Introducion
• Contribution
– Develop a new vehicule-to-vehicule model – Show the existence of a threshold
– Give the exact expression of this threshold
– Under the threshold the gain follows simple po wer law
– Above the threshold quasi-exponential – Infinite and finite radio propagation
– Simulation
Model and result
• : the intensity of eastbound vehicle density as Poisson.
• : the intensity of westbound vehicle density as Poisson.
• : the radio propagation speed
• The radio range is 1
• A phase transition occurs when =
Model and result
• : the duration the beacon waits when block ed for the ith time
• : the distance traveled by the beacon just a fter
• L(t) : the distance traveled by the beacon durin g a time t on the eastbound lane
• 3
• 2
Model and result
Phase trasition
• See paper
