Abstract
With the improvement of technology and the increasing demand for convenience and comfort, new interests have emerged in commercial and entertainment service in VANET. The downloading service of large popular files has played a crucial role for those commercial and entertainment service application. In this paper the author proposed an efficient scheme to help vehicle nodes download the large popular files from the Road Side Unit (RSU). Due to the constraint density of RSU and high mobility of vehicle nodes, vehicle nodes cannot download the whole large files from RSU before they move out of the communication range. To deal with this problem, we proposed multiple access modes downloading schemes: vehicles download files from RSU directly, vehicles download files through relay vehicles, and vehicles download files through other vehicles. We give credit-based incentives for relay vehicle selection to guarantee the stability and quality of the link bandwidth. We also proposed a game theory-based way to control number of neighbors reply packets, which does not cost additional bandwidth resource and ensure integrity of the files. Finally, simulations show that our proposed schemes performed well in high mobility VANET environment and ensure the data integrity.
Highlights
In vehicular ad hoc network (VANET), safe navigation and congestion avoidance has been the main driver in the early years
The downloading services of large popular files have played a crucial role for those commercial and entertainment service applications. Such information downloading service requirement may contain a series of cases: vehicles update the latest version of local Global Positioning System (GPS) maps [1], business may issue a notice or broadcasting some multimedia advertisements [2], drivers want to access the real-time road congestion information [3], and travels may need the information about local attractions or snapshots of nearby resort areas and passengers may play games [4], listen to the music [5], use all kinds of entertainment application service, or watch a variety of popular video [6]
To better describe our scenes proposed in our scheme, we need to use SUMO (Simulation of Urban Mobility) software [23] to generate a corresponding map scenario that includes roads, intersections, vehicles, and Road Side Unit (RSU)
Summary
In vehicular ad hoc network (VANET), safe navigation and congestion avoidance has been the main driver in the early years. Due to the high performance of scalability and date rate, BitTorrent software based on P2P technology was accepted and used by more and more people over the last few years [8] Such mechanism cannot be applied to VANET directly [9]. The author proposed efficient downloading services of large popular files in VANET based on 802.11p. Due to the the high mobility of vehicle nodes, vehicle nodes cannot download the whole large files from RSU before they move out of the communication range To deal with this problems, our downloading services include three stages: vehicles download files from RSU directly, vehicles download files through relay vehicles, and vehicles download files through other vehicles.
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