Performance enhancement in VANET with admission control and contention window adjustment
Date
2012-09-10
Authors
Tiwari, Vivek
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Abstract
Vehicular Ad Hoc Networks (VANET), a derivative of mobile networks, has the
capability to increase the safety, e ciency and comfort of transportation systems,
and provide users on-the-road Internet connectivity. Because of its impetus and
signi cance in practical scenarios, it becomes a sought after topic in both industry and
academia. In this thesis, we focus on the vehicle-to-infrastructure (V2I) drive-thru
Internet services in a highway scenario. The road side unit (RSU) along a highway
can provide network services for vehicles within the coverage. To enhance the network
performance, we propose two strategies. First, to ensure a high network throughput,
the RSU uses an admission control strategy to limit the competition among vehicles,
and avoid the waste of channel time to the low-data-rate users. Second, based on
the vehicle density, we also propose a contention window (CW) adjustment strategy
which can reduce the collision probability when the network is congested, and reduce
the idle time otherwise. Extensive simulations using network simulator (NS-2) are
given, which demonstrate the e ectiveness of the proposed solutions.
Description
Keywords
mobile networks, vehicular ad hoc networks, transportation