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Information Propagation Speed in Bidirec tional Vehicular Delay Tolerant Networks

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Information Propagation Speed in Bidirec tional Vehicular Delay Tolerant Networks

Infocom 2011

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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.

(3)

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

(4)

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 =

(5)
(6)

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

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Model and result

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Phase trasition

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• See paper

參考文獻

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