Algorithm 1 WGS for illumination pattern determination.

Input:  collection of cells $\left\{N\right\}$, set of demand of all cells $D_t=\left\{D_t^i\left|i\in \mathrm{N}\right.\right\}$ Output:  the set of illuminated cells $\Phi$ 1:Initialize $\Phi =Ø$, $Count=0$; 2:for i=1 to N do 3:    count the $d_{u,t}^i$ and $d_{nu,t}^i$; 4:end for 5:Normalize two types of demand: $nor\_d_{\ast ,t}^i=d_{\ast ,t}^i/{\displaystyle \sum _{i=1}^N}{d}_{\ast ,t}^i$; 6:Obtaion weighted demand: ${\tilde{d}}_t^i={\omega }_1\ast nor\_d_{u,t}^i+{\omega }_2\ast nor\_d_{nu,t}^i$; 7:while$Count<K$do 8:    $i=arg\max {\tilde{d}}_t^i,i\in \left\{N\right\}$ 9:    Add i to $\Phi$ and reomve i from $\left\{N\right\}$ 10:    $Count=Count+1$ 11:end while