A Secure Downlink Transmission Scheme for a UAV-Assisted Edge Network

Algorithm 1

The proposed hybrid iteration algorithm.

1: Input

 : the initial power allocation coefficients.

 : the initial UAV 3D trajectory.

 : a slack variable.

2: Set: iteration index , the maximum iteration step , and the threshold

3: repeat

4: Compute the optimal by solving (20) with

5: Compute the optimal by solving (27) with

6: Obtain the current optimal objective function

7: Update iteration index

8: until or

9: Output the objective value