  Beyond fifth generation (B5G), communication has attracted much attention
from academia, industry, and mobile network operators due to network
densification, ultra-low latency communication, and enhanced energy and
spectrum efficiency. However, a post-disaster emergency management system
(EMS), which increasingly relies heavily on wireless communication
infrastructure, is falling far behind in innovation and funding. Because the
B5G concept represents a telecommunications industry revolution, EMS
provisioning is intended to be dispersed, autonomous, and robust to network
weaknesses caused by human and natural calamities. When the network is
congested, partially functioning, or entirely isolated, we provide
multi-device-to-device (D2D) communication to extend the communication coverage
area with improved energy efficiency. Furthermore, we examine D2D multi-hop
energy efficiency performance in the proposed network. The results demonstrate
that the improved D2D multi-hop energy efficiency can improve the EMS
effectively and efficiently in extending the coverage area and enhancing energy
efficiency. Moreover, the proposed approach has been proven to increase energy
efficiency, which acts as a suitable network design to recover from natural
disasters and potentially save many lives
