Multimedia cooperative sharing method based on P2P-BT in VANET

The invention belongs to the technical field of mobile communication and discloses a multimedia cooperative sharing method based on a P2P-BT in a VANET. Firstly, to implement a PB-MCSM well in the VANET, a VANET hierarchical structure is established according to characteristics of a general P2P-BT in combination with the characteristics and motion trail of different vehicles in the VANET; then a multimedia query algorithm based on distributed Tracker servers is proposed for a problem that the multimedia resource query rate is low in the VANET; and then a tree-shaped returning algorithm based on indirect reciprocity game is proposed so that it is ensured that a vehicle also uploads while downloading and thus transmission delay caused by selfishness and chain scission is solved. The beneficial effects and advantages of the multimedia cooperative sharing method based on the P2P-BT in the VANET are that the method is capable of simulating the multimedia transmission state of nodes under a practical environment and applicable to a selfish VANET environment. Experiments show that the method improves successful query rate and returning rate of multimedia resources in the VANET and reduces returning delay in a returning process and improves the satisfaction degree of a vehicle user.