To ensure the terminal can establish connection with a number of PDN at the same time and the establishment of multiple EPS bearer, the SGW entity used for management of multiple instances was added to LTE system. MME entity and the dispose of multiple instances were introduced and two different type states of ESM entity was analyzed, a new state transition integration program was proposed. SDL and TTCN test tools are applied for tests and simulation of PDN connectivity procedure. Simulation results show that this process in full compliance with the LTE standard, verify the correctness and feasibility of this design.
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