| V2X(Vehicle-to-Everything),as the foundation of future intelligent transportation system,which is mainly used to improve transportation safety and transportation efficiency.In the vehicle networking system of intelligent transportation,the Roadside Equipment integrates a variety of communication devices and sensing devices to communicate with vehicles,vehicle networking cloud platforms,and road infrastructure.The interfaces and communication protocols of different communication devices and sensing devices are very different,which makes it difficult to develop the upper layer application of roadside devices.At the same time,the real-time requirements of Roadside Equipment for processing and distributing different information are also different.Aiming at the above problems,this thesis proposes software architecture for lightweight middleware for Roadside Equipment application communication and message distribution,and focuses on message management,scheduling and distribution,and remote upgrade of Roadside Equipment security applications.The main work of the thesis is as follows:1.The thesis designs a software architecture based on lightweight middleware to realize the classification management and distributeing of messages on the Roadside Equipments in heterogeneous communication networks.The middleware consists of a message broker layer,a communication network management layer,and an information security module.The message broker layer uses the publish-subscribe model to process the distributeing of messages,and prioritizes the processed messages according to the attributes of the messages,then uses the priority-based message scheduling method to preferentially distribute high-priority messages.The communication network management layer shields the application layer from the heterogeneity of the underlying communication network.The information security module ensures communication security between the Roadside Equipment and the cloud platform.2.In order to improve the portability of Roadside Equipment Internet of vehicles applications,this thesis designs the codec interface and data unit conversion interface between T/CSAE53-2017 standard message defined by ANS.1 and the C language structure used in application development based on the software architecture,,so as to solve the problems of T/CSAE53-2017 standard codec application in vehicular communication.3.Facing the application requirements of Internet of vehicles,the thesis designs and implements two kinds of safety applications related to Roadside Equipment defined by T/CSAE53-2017 standard based on software architecture: emergency vehicle priority traffic application and road hazard warning application.The thesis designs the application remote upgrade solution.4.The functions of the middleware of the Roadside Equipment and the application development upgrade based on the middleware architecture is tested by building a test and verification platform.The results of the study are that software framework of the Roadside Equipment is feasible and correct. |
