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In this paper, we discuss the functionality of mobile systems in a new generation network. Our goal is to provide mission-critical services using the mobile systems in the fields such as energy, disaster prevention, and medical care. It is necessary to guarantee both reliability and quality of communication for these services. We show that the future mobile systems should have three functions for cooperating with virtualized backbone networks and applications. We show the system architecture for achieving the functions, and preliminary evaluation on a testbed environment.