Telecommunications Systems Engineering Using SDL
Telecommunications Systems Engineering Using SDL
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This paper shares our experiences in using SDL to unit test TTCN-2 scripts written for the conformance testing of 3G UMTS protocols. The tool used in this assignment was Telelogic TauTM, which provided a way of bridging SDL and TTCN-2. Telelogic calls this feature “co-simulation”, which allows testing SDL applications using TTCN without the need for writing target adaptation, environment, and encoding and decoding parts. This paper describes how the co-simulation feature was used the other way around, i.e., to check TTCN protocol conformance test cases. The work was carried out to test a TTCN test suite for inter system handover protocol conformance (3G to 2G). The experiment successfully demonstrates the capabilities of co-simulation and its benefits in developing TTCN test cases, particularly when target test equipments are under development.