Figure 2

Plots of the ergodic capacities for both frequency reuse patterns FR1 and FR3 as functions of H _pl,0 . We see that for high channel gains (i.e., near the center of the cell), we obviously have $C_{\text{erg}}^{\text{FR1}}>C_{\text{erg}}^{\text{FR3}}$, whereas for low gains (at the cell border), we might have $C_{\text{erg}}^{\text{FR1}}<C_{\text{erg}}^{\text{FR3}}$. So, the ergodic capacity curves may exhibit a point of intersection $H_{\text{pl},0}^{\ast }$ around which applying either FR1 or FR3 should prevail. $H_{\text{pl},0}^{\text{min}}$ is the path loss at the cell border.