The paper presents requirements related to a heterogeneous interoperable and transportable gateway called HitGW that is designated to connect different incompatible communication systems used by First-Responders (FRs) and to make them interoperable with IP-based networks. The HitGW allows IMS type of services and applications over a broadband network composed of ordinary Public Protection and Disaster Relief (PPDR) networks and Commercial Communication Networks (CCNs). Such a system solution for FRs becomes indispensable for interoperable, effective, secure, and safety communications especially in national and cross-border crisis scenarios. The innovativeness in the chosen approach to design and implement such a system gateway primary consists in the user needs and current trends of PPDR networks toward 4G LTE type of networks and services.
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