An Optimal Joint User Association and Power Allocation Algorithm for Secrecy Information Transmission in Heterogeneous Networks

Algorithm 2

Lagrange dual method based power allocation algorithm.

(1)  Set the maximum number of iterations and the maximum tolerance

(2)  Initialize Lagrange multipliers ,

(3)  repeat

(4)  Calculate the power allocation strategy

(5)  Update the Lagrange multipliers:

          ,

(6)        if  

                  then

(7)           Convergence = true

(8)         return  

(9)         else

(10)          

(11)        end if

(12)       until Convergence = true or