Studies On Platoon Stability Connectivity And Data Transmission In Vehicle Network

In the Internet of vehicles scenario,the vulnerable inter-vehicle communication caused by high-speed vehicles cannot guarantee reliable data transmission.According to the characteristics of road rules,vehicles with geographical proximity can form clusters,which can reduce the influence of vehicle moving randomness to a certain extent and extend the link duration of vehicles within the cluster.In order to compensate for the lack of cluster stability,the motion consistency behavior of vehicles within the cluster is described by platoon-based movement mode in this thesis.Besides,a strong connectivity V2 V communication environment is constructed to further improve the data transmission performance.Specific studies are as follows:1.In view of the insufficient consideration of the continuous motion law of vehicles in existing vehicle network clustering algorithms,the cluster stability is limited.,This thesis studied a cluster optimization algorithm based on platoon stability,which analyses the distribution of vehicles on the road to initialize the network scene by platoon-based V2 V communication model.At the beginning of the time slot,the cluster formed by geographical similarity is used to design the platoon leader selection algorithm based on motion consistency to reduce the randomness caused by dynamic change of network topology.In addition,in the maintenance phase of platoon stability,platoon members gradually reach agreement with the platoon header and isolated nodes with potential platoon header attributes through the consistency protocol until the platoon is updated to maximize the consistency of vehicle movement in the platoon.The simulation results show that the proposed algorithm can effectively guarantee the cluster stability and prolong the V2 V link duration.2.Considering the problem of platoon stability which is seldom taken into account in existing data transmission schemes,a data transmission scheme based on platoon stability is studied.The data transmission strategy is given by combining the "Predecessor-leader" communication topology and the random characters of data packet transmission process.Based on this strategy,the network data transmission delay optimization function is constructed.The transmission rate boundary is analyzed by the characteristics of platoon topology structure to construct optimization function constraints.In addition,in order to optimize the data transmission delay,the Lagrangian dual decomposition method isintroduced to analyze the feasible solution of the function.The simulation results show that the proposed scheme can effectively reduce data transmission delay and improve data transmission reliability.