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| Literature | Recovery method | Contribution | Limitation |
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| [23] | Data collection by hybrid path planning using probabilistic roadmap and artificial bee colony algorithm | The proposed UAV system employs directional antennas, energy-saving clustering, and a hybrid path-planning algorithm to optimize communication, energy efficiency, and obstacle avoidance in UAV-aided WSNs. | The experiments in different size, speed, and dynamic obstacle scenes are not considered. How to ensure accurate synchronization of sleep and wake-up with UAV arrival time in practice is not considered. |
| [24] | Restore emergency communication using a new routing protocol, connectivity modules for UAVs, and a tested navigation system. | The proposed emergency communication system, comprising three subsystems, was evaluated using simulation and real flight data, demonstrating its practicality and effectiveness in postdisaster scenarios. | The inadequacy of this research is that only one helicopter is used for simulation. Therefore, how to use a group of autonomous helicopters to conduct field tests to verify the success of the proposed communication system in many performance parameters, including jitter, throughput, availability, range, and packet loss, is a certain challenge. |
| [25] | Recover the communication link in a natural disaster in multi environments. | The work utilizing UAV-IoFT communications to provide alternative coverage services through UAV deployment, considering dual-slope propagation models and user device distance for improved connectivity and energy efficiency in postdisaster scenarios. | The ray signals between the UAV and the ground user device by the diffracted or reflected represent indirect links due to obstacles’ interaction. |
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