Popular content distribution is one of the key services provided by vehicularad hoc networks (VANETs), in which a popular file is broadcasted by roadsideunits (RSUs) to the on-board units (OBUs) driving through a particular area.Due to fast speed and deep fading, some file packets might be lost during thevehicle-to-roadside broadcasting stage. In this paper, we propose apeer-to-peer (P2P) approach to allow the OBUs to exchange data and complementthe missing packets. Specifically, we introduce a coalitional graph game tomodel the cooperation among OBUs and propose a coalition formation algorithm toimplement the P2P approach. Moreover, cognitive radio is utilized forvehicle-to-vehicle transmissions so that the P2P approach does not requireadditional bandwidth. Simulation results show that the proposed approachperforms better in various conditions, relative to the non-cooperativeapproach, in which the OBUs share no information and simply response to anydata request from other OBUs.
展开▼
