The research of RRC connection establishment and co-simulation of SDL and TTCN

This paper introduces and analyzes the LTE RRC sub-layer protocol stack structure and function, designs the state and the state conversion process of the RRC sub-layer. It also designs the realization of the RRC connection establishment process. And we simplify signaling interaction between layers based on the characteristics of the project. Finally, it designs the simulation of SDL flowchart of the RRC connection establishment process. Through the MSC map generated by the Co-Simulation of SDL and TTCN, we can verify the correctness of the designed signaling process.