National disasters can threaten national security and require several
organizations to integrate the functionalities to correspond to the event. Many
countries are constructing a nationwide mobile communication network
infrastructure to share information and promptly communicate with corresponding
organizations. Public Safety Long-Term Evolution (PS-LTE) is a communication
mechanism adopted in many countries to achieve such a purpose. Organizations
can increase the efficiency of public protection and disaster relief (PPDR)
operations by securely connecting the services run on their legacy networks to
the PS-LTE infrastructure. This environment allows the organizations to
continue facilitating the information and system functionalities provided by
the legacy network. The vulnerabilities in the environment, which differ from
commercial LTE, need to be resolved to connect the network securely. In this
study, we propose a security model design framework to derive the system
architecture and the security requirements targeting the restricted environment
applied by certain technologies for a particular purpose. After analyzing the
PPDR operation environment’s characteristics under the PS-LTE infrastructure,
we applied the framework to derive the security model for organizations using
PPDR services operated in their legacy networks through this infrastructure.
Although the proposed security model design framework is applied to the
specific circumstance in this research, it can be generally adopted for the
application environment.

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