Research On VANET Broadcasting Technology And Hardware Platform Implementation In Urban Environment

The complexity of the urban vehicle network environment is relatively high,and the highly dynamic characteristics of vehicle node distribution density and topology structure pose challenges to data transmission in the vehicle network.Broadcast technology is an important means to achieve data transmission at nodes of the Internet of Vehicles,which can ensure real-time and effective data transmission,greatly improve vehicle operation efficiency,and avoid traffic accidents.At the same time,in order to better implement the application of Internet of Vehicles broadcasting technology,it is necessary to carry out research on hardware simulation platforms based on actual scenarios.This paper studies the Internet of Vehicles broadcasting technology from two aspects: the Internet of Vehicles broadcasting algorithm and the hardware simulation platform.A probability based distributed competitive forwarding PLPB(Probability and Local Perception Broadcast)broadcasting algorithm is proposed to address the issues of low dynamic adaptability of node density in urban environments and network performance degradation when nodes generate local aggregation.This algorithm embeds node location and local topology information collected by the network into broadcast packets to help relay nodes obtain a prior topology structure to calculate forwarding probability.At the same time,it extracts the distribution feature information of local topology centers and edge nodes to assist relay nodes in adjusting forwarding probability and optimizing the potential "message interruption" and "local broadcast storm" problems caused by node distribution area aggregation.The simulation results show that the PLPB broadcasting algorithm has good network redundancy suppression and adaptive ability to node density and node distribution.It has good performance in reducing network average latency and improving packet delivery rate,and can well meet the information exchange needs of the Internet of Vehicles in urban environments.Secondly,in response to the issue of high testing costs and difficulty in actual scenarios of vehicle networking broadcasting,a lightweight hardware simulation platform based on the Open Wrt embedded system was designed and built.The proposed PLPB broadcasting algorithm was tested in multiple indoor and outdoor scenarios,and the test results verified its performance in real scenarios.The platform adopts an application layer centralized control scheme with strong scalability,and the lightweight platform structure design makes the layout cost of simulation testing scenarios lower.By comparing and analyzing the actual test results of the PLPB broadcasting algorithm,which are consistent with the software simulation conclusions,the reliability of the PLPB broadcasting algorithm performance is demonstrated,and the hardware simulation platform has good effectiveness and practicality.