| As one of the key technology of Intelligent Transport System,Dedicated Short Range Communication(DSRC) is a dedicated communication protocol that is presented by CEN.It is used in not only Electronic Toll Collection (ETC) but also other area of ITS.DSRC starts communication process by sending InitilizationRequest from RSU,thus drivers could pay for the path without stoping their vehicles that have entered into the service area.The purpose of this thesis is to explore the designing idea,content,and realization mechanism of DSRC. On basis of exploring, a transaction managing and encoding and decoding are designed to be used to solve the key problems in DSRC applications. This thesis also introduces the designing idea and realization method for the transaction,information process,timer and encoding and decoding modules. In addition, the testing result to the function of the modules are presented.In the first part, the author outlines the background and researching status of DSRC.In the second part ,the author describes three kernel of DSRC and explains them in aspect of service ,action and parameter. In the third part ,encoding rules for all kinds of data type of ASN.1 issued by ITU is explored and realized with the method of object-oriented technology. In the fourth part ,the author firstly enumerates all data structure,then analysises transaction managing and multithreading scheme in detail,at last introduces the method for avoiding the race condition of sharing data for multithreading. In the fifth part,all of modules of the thesis is analysed with figure and discussed several assistant function ,process function of driver table and interface function. In the last part ,author tests the designing ideal and draw a conclusion. |
