Algorithm 1 Rank algorithm of IRS allocation for Bobs scheduling.

Input:$R_B^{(i,j)}$ Output:pair $pair=\varnothing$ for loop = 1:N $(i,j)=\underset{i,j?[1,N]}{\mathrm{argmax}}({\mathrm{R}}_B^{(i,j)})$  ${\mathrm{R}}_B^{}={\mathrm{R}}_B^{}\backslash ({\mathrm{R}}_B^{(i,:)}\mathrm{U}{\mathrm{R}}_B^{(:,j)})$ $pair=pairU(i,j)$ % Pair relationship between IRS reflection matrix and Bob end