Energy Efficiency and Capacity Tradeoff in Cloud Radio Access Network of High-Speed Railways

Algorithm 1

Energy-efficient power allocation.

() Initialize , set threshold value , maximum number of iteration ;

() is the number of iteration, set and begin iteration (Outer Loop);

() for    do

()  Solve the power allocation with ; (Inner Loop)

()  Use the Lagrangian dual method to obtain and ;

()  if    then

()   Set ;

()   break;

()  else

()      set ;

()  end if

() end for