User Mobility-Aware Time Stamp for UAV-BS Placement

Unmanned aerial vehicle (UAV) assisted communication networks have garnered considerable attention of the research community due to their key features of high mobility, fast deployment and easy access to remote areas. UAV base stations (UAV-BSs) are the indispensable component of such networks. Specifically, three-dimensional (3-D) placement of UAV- BS is pivotal in serving the ground users with the desired quality-of-service (QoS). Moreover, in a scenario where users are mobile, UAV-BS placements need to be updated while considering the user mobility. However, an equally important challenge is to optimize the time separation of the placement updates or update interval. Hence, in this work, we propose a framework for joint optimization of UAV-BS placement and the update interval while accounting for the user and UAV mobility parameters. Furthermore, we determine the analytical expressions for the coverage probability of users. We also evaluate the network service time and the number of users covered for the considered network.