The present document describes the basis for a functional and technical specification and standards platform that can be installed as either a private system owned by government or a governmental/commercial partnership that provides priority service to public safety agencies and possibly secondary service to other commercial clients. It is envisaged that the Project MESA specifications will define robust management and control systems to ensure secure and reliable operational capabilities for the public safety and public security users worldwide. The present document reflects the requirements of public service and public safety agencies to have priority service and system restoration@ extremely reliable service@ and ubiquitous coverage within a user's defined service area.