  Most non-safety applications deployed in Vehicular Ad-hoc Network (VANET) use
vehicle-to-infrastructure (V2I) and I2V communications to receive various forms
of content such as periodic traffic updates, advertisements from adjacent
road-side units (RSUs). In case of heavy traffic on highways and urban areas,
content delivery time (CDT) can be significantly affected. Increase in CDT can
be attributed to high load on the RSU or high volume of broadcasted content
which can flood the network. Therefore, this paper suggests a novel caching
strategy to improve CDT in high traffic areas and three major contributions
have been made: (1) Design and simulation of a caching strategy to decrease the
average content delivery time; (2) Evaluation and comparison of caching
performance in both urban scenario and highway scenario; (3) Evaluation and
comparison of caching performance in single RSU and multiple RSUs. The
simulation results show that caching effectively reduces the CDT by 50% in
urban scenario and 60-70% in highway scenario.
