An efficient content downloading method based on improved Chord algorithm in vehicle ad-hoc network

Due to the rapid development of network communication technology, Vehicle ad-hoc Network(VANET) has become a hot topic. However, the information transmission in VANET is a challenge due to the vehicle moving speed, which makes the communication difficult between vehicles or vehicle and Internet. Peer-to-Peer algorithm is a key network communication technology, and participants in the network share a portion of their hardware resources and can be directly accessed by other participants without intermediaries. So it is helpful for content downloading in Mobile ad-hoc Network(MANET). But VANET as a special kind of MANET has its special characteristic such as fast moving, sufficient energy, and so on. The network itself has a network of multiple hops, dynamic topology, self-organizing, limited link bandwidth, distributed control, energy limited, etc. It is proved that the P2P algorithm can share files and network coding, and also the network coding can reduce the duplication of transmission and simplify the transmission scheme, but it costs 200s to download a 1Mb file under city scenario. Hence, this paper will give one efficient content downloading algorithm in VANET based one improved Chord algorithm, and our algorithm is bidirectional query and non-redundancy.