Abstract: It’s in context that the digital trunking communications network is widely used, the development model based on model-driven is used to design, develop and test on the digital trunking circuit mode control entity. First, an overall structure of digital trunked air interface protocol stack is briefly analyzed and a framework of CMCE is summarized. Then, the design of call control is described in detail, and the designs of call control business processes, primitives, PDU and status machine are emphasized. Finally, Rhapsody is used as the development software to implement the protocol stack and its conformance testing, the test results comply with protocol standards.

Key words: digital trunked, air interface protocol stack, circuit mode control entity, model driven, conformance tests