Research And Design Of Message Preprocessing Method For C-V2X On Board Unit Based On Threat Assessment

With the continuous expansion of C-V2X(Cellular-vehicle-to-everything)vehicle networking application scale,C-V2 X devices are gradually increasing.On Board Unit provide the most important vehicle safety driver assistance will receive information of mass equipment,realizing the auxiliary safety,transport efficiency,information services and other kinds of applications.In order to solve the problem of auxiliary security lag processing of the on-board terminal in the scenario of mass data access,the thesis designed message preprocessing method for C-V2 X On Board Unit based on threat assessment to improve the on-board unit’s ability to process messages,ensure the reliability of vehicle safety assisted driving applications.The primary research tasks are described below:1.Firstly,in response to the need for message preprocessing in the C-V2 X vehicleroad collaborative environment,there is a V2 X message preprocessing architecture based on threat assessment.Though the establishment of related mechanisms such as V2 X message caching,filtering and scheduling,the problem of lack of preprocessing of V2 X messages can be solved,ensuring that messages related to auxiliary safety applications can be processed reliably in real time.2.Secondly,in view of the lack of judgment basis for V2 X message preprocessing,there is a threat assessment method based on V2 X vehicle-road coordination.And considering the problems of convergence and one-sidedness of weighting in traditional subjective weighting methods,there is a hybrid weighting method based on AHP,Delphi and entropy.Under the premise of respecting actual objective data,it reflects the importance of each factor itself,and verifies that the weights obtained by the hybrid weighting method are more reasonable,ensuring that it provides a reliable basis for the preprocessing of information related to auxiliary safety applications.3.Finally,a message priority scheduling policy based on threat assessment is designed to solve the problem of delayed response of messages related to auxiliary security applications when the on-board terminal receives massive data.In this way the received messages will be prioritized according to the degree of threat,and the messages with high priority will be processed first,thereby reducing the delay in response to highrisk scenarios in vehicle safety driving applications and improving the safety of vehicles while driving.At the same time,this scheduling strategy can avoid the ignorance of the potentially dangerous driving behaviors in the actual traffic environment because the nonimportant messages are completely unprocessed due to its low priority.