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Four test methods based on abstract models for end system are defined by the international standard ISO/IEC9646. However, the test framework serving GMR-1 3G protocol stack test derived from four test methods can’t meet both cross-platform and real-time requirements. To solve this problem, the ferry clip test approach introduced by Chinese Academy of Science is extended based on GMR-1 3G protocol stack and applied to the development of GMR-1 3G protocol stack in practice. The test pass rate for the total 255 test cases related to real-time procedures is 100%. In the meantime, the unified test frameworks and unified test scripts are economical, which are both performed in the only host serving the test of protocol logical procedures and in the real target board serving the simulation test of real-time environments.