Software deployment

Operating system

Algorithm

Channel allocation schemes

Physics

Channel (broadcasting)

Optimization problem

Telecommunications link

Dynamic bandwidth allocation

Power (physics)

Bandwidth allocation

Bandwidth (computing)

Computer network

Computer science

Transmitter

Wireless

Power control

Quantum mechanics

Transmitter power output

Telecommunications

Real-time computing

IEEE Communications Letters

In this letter, the problem of unmanned aerial vehicle (UAV) deployment, power allocation, and bandwidth allocation is investigated for a UAV-assisted wireless system operating at terahertz (THz) frequencies. In the studied model, one UAV can service ground users using the THz frequency band. However, the highly uncertain THz channel will introduce new challenges to the UAV location, user power, and bandwidth allocation optimization problems. Therefore, it is necessary to design a novel framework to deploy UAVs in the THz wireless systems. This problem is formally posed as an optimization problem whose goal is to minimize the total delays of the uplink and downlink transmissions between the UAV and the ground users by jointly optimizing the deployment of the UAV, the transmit power and the bandwidth of each user. The communication delay is crucial for emergency communications. To tackle this nonconvex delay minimization problem, an alternating algorithm is proposed while iteratively solving three subproblems: location optimization subproblem, power control subproblem, and bandwidth allocation subproblem. Simulation results show that the proposed algorithm can reduce the transmission delay by up to 59.3%, 49.8% and 75.5% respectively compared to baseline algorithms that optimize only UAV location, bandwidth allocation or transmit power control.

Joint Location, Bandwidth and Power Optimization for THz-Enabled UAV Communications