Research On Data Transmission Mechanism Of Vehicle-mounted Self-organizing Network Based On Urban Scenarios

The new generation of technological revolution centered on the Internet and informatization has become an important strategy for national development.In the field of intelligent transportation,in vehicle ad hoc networks technology and applications have become a research hotspot in this field.However,the vehicle ad hoc networks has inherent characteristics such as high node mobility,frequent changes in network topology and complex urban roads,which makes the data transmission in the vehicle ad hoc networks face severe challenges.In order to meet the needs of data transmission efficiency in urban environments,the research on the routing protocol of the vehicle ad hoc networks in the urban scene is particularly important.In response to the above problems,this article fully considers the inherent characteristics of the vehicle ad hoc networks,analyzes the performance of the existing routing protocol in the network,and proposes an improved routing protocol based on geographic location in combination with urban scenarios,aiming to increase the data packet transmission rate and reduce end-to-end delay and avoid urban obstacles.The main research contents are as follows:1.Aiming at the path optimization problem of vehicle nodes in the vehicle ad hoc networks,combined with the optimization mechanism of the sparrow search algorithm,dynamic path planning of the vehicle nodes in the urban scene is carried out.Firstly,the urban roads are segmented and abstractly designed,and then the path sequence set is established through the interaction of data request and response message packets,and the fitness value of each path is determined according to the interaction time of each path message packet.The one with the highest value is the main path,and the remaining paths are the backup paths.Finally,due to the high dynamics of vehicle nodes,the sparrow search algorithm switches between active and standby paths through periodic iterations.2.Aiming at the problems of routing holes,routing loops,link communication quality and irregular obstacles that appear in urban scenarios,improvements are made to the greedy peripheral stateless routing protocol based on geographic location.Firstly,the beacon mechanism of the routing protocol is improved in combination with the urban scene.Then introduce routing metrics,link survival time,and obstacle avoidance strategies to solve the corresponding problems.Finally,the proposed routing protocol is simulated and verified,and the routing evaluation index is selected to compare with the classic geographic location-based routing protocol.The results show that the routing protocol has better performance.There are 27 figures,4 tables,and 78 references.