| The rapid development of Internet of vehicles has effectively improved road traffic efficiency.More and more users transmit and share data in the Internet of vehicles.With the expansion of network scale,data privacy,security problems gradually appear.The Internet of vehicles has introduced blockchain technology to ensure the anonymity and consistency of data,but the transaction performance is also limited.The inherent global consensus and chained storage technology of blockchain limits that all nodes must process one block synchronously and cannot consensus multiple blocks in parallel,which limits the transaction processing performance of Internet of vehicles blockchain in high-density transactions.In order to solve this problem,this paper focuses on the consensus mechanism and storage structure of Internet of vehicles blockchain,proposes a blockchain adaptive grouping consensus technology,and designs an Internet of vehicles blockchain transaction model based on this,so as to improve the transaction processing performance of Internet of vehicles blockchain.The main research contents and contributions of this paper are as follows:(1)In view of the transaction processing performance problems caused by the blockchain global consensus mechanism and the single chain storage structure,this paper proposes the blockchain adaptive grouping consensus mechanism.In the consensus process,the number of packets is adaptively adjusted according to the number of nodes and transaction density.The nodes form a team autonomously according to the principle of the shortest delay,and the transaction consensus algorithm is executed within the team,so as to consensus multiple blocks in parallel in the blockchain network.The blocks generated by parallel consensus will have abnormal bifurcation in the traditional single chain storage structure.Therefore,this paper designs a bifurcation tolerant block storage structure,so that multiple blocks formed by divide and conquer consensus can be stored in different bifurcation in parallel,and converge to global blocks asynchronously at low transaction density,so as to realize the global consensus of blockchain node data.(2)In order to make use of the characteristics of the Internet of vehicles to further improve the transaction processing performance,this paper proposes a five stage Internet of vehicles blockchain transaction model based on the adaptive grouping consensus mechanism.The roadside node is designed as the network coordinator to multicast the team number to the vehicle node,so as to reduce the average communication times of the formation stage to linear times and accelerate the adaptive grouping process.After the team formation stage,complete the Internet of vehicles blockchain transaction process through the inquiry,response and block out stages.Finally,in the incentive stage,give more rewards to the nodes that have completed the Internet of vehicles transaction quickly,and encourage the vehicle nodes to complete the Internet of vehicles transaction as much as possible in the current team,so as to jointly improve the transaction processing performance of the Internet of vehicles blockchain in many aspects. |
