Wireless network

Scheduling (production processes)

Key (lock)

Computer network

Wireless

Base station

Engineering

Political science

Artificial intelligence

Operations management

Search and rescue

Computer science

Medical emergency

Transceiver

Real-time computing

Emergency rescue

Computer security

Emergency management

Medicine

Telecommunications

Robot

IEEE Wireless Communications

Reliable and flexible emergency communication is a key challenge for search and rescue in the event of disasters, especially for the case when base stations are no longer functioning. Unmanned aerial vehicle (UAV)-assisted networking is emerging as a promising method to establish emergency networks. In this article, a unified framework for a UAV-assisted emergency network is established in disasters. First, the trajectory and scheduling of UAVs are jointly optimized to provide wireless service to ground devices with surviving BSs. Then the transceiver design of UAV and establishment of multihop ground device-to-device communication are studied to extend the wireless coverage of UAV. In addition, multihop UAV relaying is added to realize information exchange between the disaster areas and outside through optimizing the hovering positions of UAVs. Simulation results are presented to show the effectiveness of these three schemes. Finally, open research issues and challenges are discussed.

UAV-Assisted Emergency Networks in Disasters