Читать книгу Autonomous Airborne Wireless Networks - Группа авторов - Страница 22

In UAV‐based communications, one of the key challenges is the optimal three‐dimensional deployment of hovering UAV. The capability of UAV to maneuver and adjust its altitude provides additional degree of freedom for UAV deployment in an efficient manner to improve capacity and coverage. In fact, UAV deployment is more challenging in UAV communications than in conventional terrestrial communications because the characteristics of AG propagation change with the position of the UAV. However, for efficient UAV deployment, flight duration and energy constraints must be taken into account for battery‐operated UAV, as they affect the performance of networks. In addition, simultaneous deployment of multiple UAVs is more challenging because of the co‐channel interference and the possibility of airborne collision of UAVs. Another important issue is the UAV deployment in the presence of terrestrial network. UAV deployment problem has been extensively discussed in the literature for coverage maximization 17,29,30,33,33, data collection from Internet of Things (IoT) devices [31], UAV‐assisted wireless network [27], disaster scenario [49], and caching applications [22].