RIS-aided Trajectory Optimization in Layered Urban Air Mobility
<|reference_start|>RIS-aided Trajectory Optimization in Layered Urban Air Mobility: Urban Air Mobility (UAM) relies on developing aerospace industries, where safe aviation and efficient communication are critical features of aircraft. However, it is challenging for aircraft to sustain efficient air-ground communication in urban circumstances. Without continuous air-ground communication, aircraft may experience course deviation and safety accidents. To address these problems, a reconfigurable intelligent surface(RIS)-aided trajectory optimization scheme is proposed enabling efficient air-ground communication and safe aviation in UAM with a layered airspace structure. This paper first devises a dual-plane RIS communication scheme for layered airspace. It fully engages the omnidirectional and directional signal attributes to reduce the transmission delay of the air-ground communication. Based on the dual-plane RIS configuration, we jointly develop the intra- and inter-layer trajectory scheme to optimize communication and safe aviation. In the intra-layer trajectory optimization, we propose a dual-time-scale flight scheme to improve communication capacity and horizontal flight safety. Meanwhile, we propose a safe layer-switching method to ensure collision avoidance during vertical flight in the inter-layer trajectory optimization. The communication load of the proposed scheme can be improved 40% and the time of safe separation restoration can be lessened 66% compared with the benchmarks in the layered airspace.<|reference_end|>
@article{xiong2024ris-aided,
    title={RIS-aided Trajectory Optimization in Layered Urban Air Mobility},
    author={Kai Xiong, Supeng Leng, Liyuan Chen, Dapei Zhang, Chongwen Huang, Chau
  Yuen},
    journal={arXiv preprint arXiv:2409.16122},
    year={2024},
    archivePrefix={arXiv},
    eprint={2409.16122},
    primaryClass={cs.CE}
}