Contact-Aware Data Replication in Roadside Unit Aided Vehicular Delay Tolerant Networks

Abstract—Roadside units (RSUs), which enable vehicles-toinfrastructure
communications, are deployed along roadsides
to handle the ever-growing communication demands caused
by explosive increase of vehicular traffics. How to efficiently
utilize them to enhance the vehicular delay tolerant network
(VDTN) performance are the important problems in designing
RSU-aided VDTNs. In this work, we implement an extensive
experiment involving tens of thousands of operational vehicles
in Beijing city. Based on this newly collected Beijing trace and
the existing Shanghai trace, we obtain some invariant properties
for communication contacts of large scale RSU-aided VDTNs.
Specifically, we find that the contact time between RSUs and
vehicles obeys an exponential distribution, while the contact
rate between them follows a Poisson distribution. According to
these observations, we investigate the problem of communication
contact-aware mobile data replication for RSU-aided VDTNs by
considering the mobile data dissemination system that transmits
data from the Internet to vehicles via RSUs through opportunistic
communications. In particular, we formulate the communication
contact-aware RSU-aided vehicular mobile data dissemination
problem as an optimization problem with realistic VDTN settings,
and we provide an efficient heuristic solution for this NP-hard
problem. By carrying out extensive simulation using realistic vehicular traces, we demonstrate the effectiveness of our proposed heuristic contact-aware data replication scheme, in comparison with the optimal solution and other existing schemes.

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