Research On TTCN-3 Based Test Methodology Of Radio Block Center

3rd level of CTCS (Chinese train control system) is one of ten special projects which are of long-term and strategic importance and affecting the overall interests of the country in《"Eleventh Five-Year Plan" for Railway Technology Development》. Technical innovation of CTCS-3 plays an important role in technology development of Chinese train control system and technology improvement of communication and signal equipment. Based on the Wuhan-Guangzhou, Zhengzhou-Xi'an, and Guangzhou-Shenzhen-HongKong Passenger Dedicated Line, CTCS-3 that conforms to China's national situation and has independent patent rights is to be built through introducing key technologies of train control system, joint design, develop and research, and adopting the CTCS-2 technology which is applied successfully. As RBC (Radio Block Center) is one of the core equipments of CTCS-3, it is indispensable to do complete function test to it.In this thesis, the test methodology of RBC equipment is researched. First of all, the functional requirement of RBC is analyzed in detail, seven function including system self-test, security link management, train information management, movement authority management, RBC transition management, onboard equipment mode management, database management are listed, the interfaces of RBC with other equipment are briefly described, simulation test platform is introduced, and test method that reflects the completion function of RBC through data flow test is brought forward. Secondly, the RBC operating processions are modeled and use case diagram, state diagram, and activity diagram are generated; function features are abstracted and test cases are designed based on these diagrams. Thirdly, the necessity and design principles of test sequence are introduced; all scenarios that RBC is involved in are divided and described; design idea based on scenario is put forward; based on combination of basic scenario and optional scenario, test sequence is designed and generated. Finally, with tool TTworkbench , test system for the RBC based on the TTCN-3 is designed and implemented, supporting environment for simulation test of RBC is simulated, the function of controlling and managing test process is actualized, realization process of test system is described in detail, and simulation experiment is done and the experimental results are analyzed.The innovation of this thesis is to apply the new standardized black-box testing language TTCN-3 to RBC of test train control equipment with communication protocoltest methods. Analysis result of simulation test shows that design plan put forward inthis thesis is feasible.