## 2 A Portable 5G Platform Architecture for First Responders
During the operation, the Slice Manager can intervene and re-allocate resources, fulfilling the real-time needs and objectives of the mission, \(\circ\) NFVO: This orchestrates the deployment of virtualized service components, according to network function virtualization provisions \(\circ\) SDN control: This controls the provision of network resources within the PCS based on the slice type. The computing infrastructure is exploited for the deployment of all the network applications and services required for operations. The infrastructure resources are assigned and allocated to each specific slice serving the application or FR team, fulfilling their requirements. * UAV flight control: This is located at the PCS UAV communication stand at the edge of the system, where different operations can take place. This specific function operates over a uRLLC slice in order to minimize control latency and optimize UAV response times. * Video analysis identification: This virtualized service processes video feeds from UAVs and other units, and performs machine learning-powered object detection. The detected objects and subjects are automatically annotated in order to facilitate the situation assessment in the control center. * Rescue team monitor: Each First Responder group is equipped with sensors that monitor their current health state, position, etc. This module operates over an mMTC slice as it collects and aggregates the data from multiple sensors and performs post processing to assess each group's state. * AR app: AR for First Responders incorporates various enablers in a dynamic, rich-media interface for the responder, i.e., thermal image streaming and sensor monitoring. The immersive stream is also transmitted back to the control center for further assessment. * IP Multimedia Subsystem (IMS): This component provides connectivity for group communication over voice and video among each responder group. It is the backbone of emergency communications for First Responders. As can be deduced from Figure 1, it operates over the eMBB slice to address the high bandwidth requirements of the communication. * 5G Core (5 GC): This module implements the virtualized core component for 5G communications, and is the basis for providing the connectivity service for multiple slices. The 5 GC may be shared among slices, or use separate instances per slice in case isolation is of importance. Finally, the Radio Access Technology (RAT) component comprises of the two radio technologies hosted at the PCS, a private 5G RAN for FRs communications and applications, and WiFi6 for civilian access. The PCS offers enhanced functionalities compared to traditional systems, as well as the flexibility to adapt to the increased needs of First Responders. At the same time, technologies provided by the PCS constitute the basis for the development of innovative services which are extremely effective in the field of operations. The exploitation of 5G network slicing provides the required flexibility to also support the increased and versatile requirements of First Responders without any compromise. The tentative service slicing platform performs network slice mapping for each application and responder group. To further clarify the needs of each individual group and responding service, a mapping of network slices to responder services is presented in Table 1.  
As can be deduced from the mapping in Table 1, different operations among First Responder groups have different slice needs. 5G slicing addresses the complex environment of emergency communications and provides a dedicated set of network resources for each services' needs.