Research And Design Of Message Distribution Mechanism For C-V2X Vehicle Unit Based On Middleware

With the research of C-V2X(Cellular-Vehicle-to-Everything)vehicle networking technology,C-V2X On Board Unit has become the main communication equipment between vehicle and other equipment,systems.In order to meet the different requirements of different systems or devices,it is necessary to research and design the message distribution mechanism of On Board Unit to improve the distribution efficiency and communication reliability of On Board Unit messages.This thesis studies the heterogeneous communication network,middleware and other key technical issues that meet the requirements of C-V2X communication environment,focusing on the message distribution management mechanism of vehicle system.A parallel middleware software architecture based on publish/subscribe is designed.The main work of this thesis is as follows:1.C-V2X On Board Unit message middleware is designed and achieved.This thesis designs and implements a middleware architecture that adapts to Internet of vehicles communication and supports parallelization.It is based on a publish/subscribe model.A thread pool manager is designed to allocate and manage the parallel threads effectively.This architecture provides a good interface for Internet of vehicles applications,and enhances the concurrent communication ability of the system,so as to ensure the efficient,reliable and orderly transmission of the data between the upper application and the lower communication module.2.The key technology of C-V2X On Board Unit message distribution is realized.Aiming at the problem of the serious network load caused by periodic message distribution,an adaptive message cycle method based on fuzzy logic is proposed.This method divides the priority of messages and uses message scheduling strategy based on priority to forward high priority messages,so as to improve the efficiency of message distribution.3.Based on the research of C-V2X On Board Unit communication middleware and message distribution,C-V2X communication application examples are developed to test and verify each module in the research content.The results show that the software architecture of middleware and the adaptive message distribution method can effectively solve the communication adaptive distribution problem of heterogeneous networks and shield the communication heterogeneity between different networks.The software architecture improves the portability and development efficiency of the application.