Energy Efficiency Maximization for UAV-Assisted Emergency Communication Networks

Algorithm 1

Dinkelbach method for Equation (23).

1. Let . Initialize maximum number of iterations

 as , the convergence tolerance , and the initial

 energy efficiency .

2. repeat

3. For given , solve the problem (23) to obtain the

  the UAV altitude, downlink transmission power

  and bandwidth allocation .

4. ifthen

5. return and

  .

6. else

6.  and .

7. until Convergence or reaching .