01-04-2014, 04:19 PM
Vehicular Mobility Simulation for VANETs
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Abstract
During the last few years, continuous progresses in wireless
communications have opened new research fields in computer
networking, aimed at extending data networks connectivity to
environments where wired solutions are impracticable. Among
these, vehicular traffic is attracting a growing attention from
both academia and industry, due to the amount and impor-
tance of the related applications, ranging from road safety to
traffic control, up to mobile entertainment. Vehicular Ad-hoc
Networks (VANETs) are self-organized networks built up from
moving vehicles, and are part of the broader class of Mobile
Ad-hoc Networks (MANETs). Because of their peculiar char-
acteristics, VANETs require the definition of specific network-
ing techniques, whose feasibility and performance are usually
tested by means of simulation. One of the main challenges
posed by VANETs simulations is the faithful characterization of
vehicular mobility at both macroscopic and microscopic levels,
leading to realistic non-uniform distributions of cars and ve-
locity, and unique connectivity dynamics. In this paper we first
present and describe VanetMobiSim, a freely available gener-
ator of realistic vehicular movement traces for networks simu-
lators.Then, VanetMobiSim is validated by illustrating how the
interaction between featured macro- and micro-mobility is able
to reproduce typical phenomena of vehicular traffic.
VanetMobiSim
VanetMobiSim is an extension to CanuMobiSim [4], a
generic user mobility simulator. CanuMobiSim is a platform-
and simulator-independent software, coded in Java and produc-
ing mobility traces for different network simulators, including
ns-2 [5], QualNet [6] and GloMoSim [7]. It provides an eas-
ily extensible mobility architecture, but, due to its general pur-
pose nature, suffers from a reduced level of detail in specific
scenarios. VanetMobiSim is therefore aimed at extending the
vehicular mobility support of CanuMobiSim to a higher degree
of realism. In this section, we outline the structure and char-
acteristics of VanetMobiSim and detail the resulting vehicular
mobility support.
Macro-mobility Features
When considering macro-mobility we not only take into ac-
count the road topology, but also the road structure (unidirec-
tional or bidirectional, single- or multi-lane), the road charac-
teristics (speed limits, vehicle-class based restrictions) and the
presence of traffic signs (stop signs, traffic lights, etc.). More-
over, the concept of macro-mobility also includes the effects of
the presence of points of interests, which influence movement
patterns of vehicles on the road topology. All these different
aspects of macro-mobility are discussed in details in the re-
mainder of this section.