Abstract:

Unmanned aerial vehicle (UAV) relaying is one of the main technologies for UAV communications. It uses UAVs as relays in the sky to provide reliable wireless connection between remote users. In fact, UAVs can easily fly and reach inspection points, record surveillance data, and send this information to a wireless base station (BS). Nonetheless, in many cases, such as operations at remote areas, the UAVs cannot be guided directly by the BS in real-time to find their path. Moreover, another key challenge of inspection by UAVs is the limited battery capacity. This paper aims to investigate relay-assisted Internet of Things (IoT) communication networks in which a UAV has been used as an aerial base station (BS) to collect time-constrained information from IoT gadgets and transmit it to a ground gateway (GW). In this context, we optimize the allocated bandwidth, transmission strength, and UAV trajectory at the same time to maximize overall device throughput while satisfying the user's latency requirement and the UAV's limited garage capability. Because the problem is highly non-convex, it may be difficult to solve optimally. To arrive at an appealing answer, we first add new variables to the equation. Numerical results are given to show significant performance improvement over benchmark schemes.  

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