Abstract
In VANET (vehicular ad hoc network), RSUs (road side units) have limited coverage and high deployment cost, so they are deployed sparsely in urban area, which leads to blind zone (BZ) between adjacent RSUs, where vehicles cannot connect to Internet by RSUs. In this paper, we study how to use RSUs and vehicles to download big files cooperatively in BZ. In order to choose the cooperative vehicles with minimum total delay, we propose a sequential decision vehicle selection method based on the residual file (SSRF). The method divides the process of selection into several stages and selects cooperative vehicles from the candidates; the decision sequence generated by SSRF determines the set of cooperative vehicles. Simulation and data analysis show that our method is effective in terms of delivered ratio and file delivered delay.
Highlights
VANET is a type of mobile ad hoc networks consisting of vehicles and RSUs
In VANET, RSUs have limited coverage range and high deployment cost [2, 3], so they are deployed sparsely especially in out-ofhotspots, for example, residential areas and industrial parks, which leads to the existence of blind zone (BZ) between RSUs
We aim to reduce the delay of downloading the whole big file by making full use of two-way vehicles
Summary
VANET is a type of mobile ad hoc networks consisting of vehicles and RSUs. As the deployment of RSUs, many recent researches use 802.11p standard to realize interaction between vehicles and Internet by RSUs [1]. We aim to reduce the delay of downloading the whole big file (called the total delay) by making full use of two-way vehicles. It is possible to use the reverse vehicles, since the link duration time is more than 11.25 s (based on a maximum speed of 80 km/h and transmission range of 250 m), so they have time to forward cooperatively under the 802.11p standard [6, 7]. The most important issue in the cooperative downloading is how to select the appropriate vehicles to reduce the total delay
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