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In the context of sixth-generation (6G) networks, emergency managementsystems (EMSs) based on wireless communications have recently gained increasinginterest. Hereby, fundamentals and open problems of post-disastercommunications are discussed, especially focusing on their topological aspects.The motivation behind this choice is due to the fact that, whenever a naturalor a man-made disaster occurs, there is a high chance that the terrestrialcommunication infrastructure is compromised, and therefore alternative networksneed to be deployed efficiently in order to enable the majority of thecivilians and the first responders (FRs) to communicate. In this paper, wefirst provide a brief review of existing aerial ad-hoc networks forpost-disaster communications. Next, we shed light on some new aspects of thisproblem, which are related to the topology of the network supporting theimpacted area. Finally, with the aid of selected simulation results, we showhow the cellular infrastructure requirements for a disaster-struck regionsignificantly depend on its location and its extension.

On the Topological Aspects of UAV-Assisted Post-Disaster Wireless Communication Networks