Abstract:
Unmanned aerial vehicles (UAVs)-assisted communication systems are considered
a promising technology in diverse verticals. The objective of this research is to
study on demand deployment of UAVs in special applications. We analyze the
multi-UAV deployment in two di erent scenarios.
First, we analyze the deployment of UAVs as an aerial base stations (ABSs) to
provide cellular coverage to isolated users. The main contributions of this study
includes a less complex approach to optimally position the UAVs and assigning
user equipment (UE) to each ABS, such that the total spectral e ciency (TSE)
of the network is maximized, while maintaining a minimum QoS requirement for
the UEs. The main advantage of the proposed approach is that it only requires
the knowledge of UE and ABS locations and statistical channel state information.
We propose two approaches with common and diverse altitude selection.
Both approaches lead up to approximately 8-fold energy savings compared to
ABS placement using a naive exhaustive search.
Second, we have investigated the deployment of UAVs in wireless sensor network
(WSN) systems. Considering the energy-constrained nature of the WSN, we
have proposed a multi-UAV deployment algorithm that minimizes the maximum
power transmitted among the sensor nodes (SN) for given data rate and altitude
constraints. The problem is divided into three subproblems in order to reduce
the complexity. Each subproblem is optimized by xing other parameters as constant.
Finally, we proposed a joint optimization algorithm that combines the
approaches of all three subproblems. In the joint optimization, the rst and second
subproblems are iteratively solved together while third subproblem is solved
independently for each UAV. Moreover, the joint optimization gives the minimum
number of UAVs required to serve all the SNs with the given constraints. The
results indicate a signi cant performance gain compared to the benchmark methods
in terms of the number of iterations for convergence, maximum transmission
power requirement and the minimum number of UAV requirements.
Citation:
Hassaan, M.H.M. (2022). On Demand deployment of UAV base stations in wireless communication networks [Master's theses, University of Moratuwa]. Institutional Repository University of Moratuwa. http://dl.lib.uom.lk/handle/123/21662