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National disasters can threaten national security and require severalorganizations to integrate the functionalities to correspond to the event. Manycountries are constructing a nationwide mobile communication networkinfrastructure to share information and promptly communicate with correspondingorganizations. Public Safety Long-Term Evolution (PS-LTE) is a communicationmechanism adopted in many countries to achieve such a purpose. Organizationscan increase the efficiency of public protection and disaster relief (PPDR)operations by securely connecting the services run on their legacy networks tothe PS-LTE infrastructure. This environment allows the organizations tocontinue facilitating the information and system functionalities provided bythe legacy network. The vulnerabilities in the environment, which differ fromcommercial LTE, need to be resolved to connect the network securely. In thisstudy, we propose a security model design framework to derive the systemarchitecture and the security requirements targeting the restricted environmentapplied by certain technologies for a particular purpose. After analyzing thePPDR operation environment's characteristics under the PS-LTE infrastructure,we applied the framework to derive the security model for organizations usingPPDR services operated in their legacy networks through this infrastructure.Although the proposed security model design framework is applied to thespecific circumstance in this research, it can be generally adopted for theapplication environment.

Beyond PS-LTE: Security Model Design Framework for PPDR Operational Environment