Frequency reuse factor vs. pathloss exponent and sectorization

Abstract

Lee (1989) invented the concept of frequency reuse. Lee has also concluded in general that the frequency reuse factor has to be 7 for an 18 db C/I requirement when the path-loss exponent /spl gamma/=4. A simulator was built to do an exact C/I analysis. From the analysis, it can be seen that the C/I satisfaction percentage varies with frequency reuse factor K and path-loss exponent /spl gamma/. This is a characteristic in designing a cellular system. Specifically, for 94% C/I satisfaction percentage, we only need K=3 for sectorized cells. Also, we can see that the first interfering tier is the most dominating in the interference contribution. We give a conservative approximation of the ratio of 2nd and 3rd tier to 1st tier interference for uniformly distributed mobiles in the reverse link. We also find that power control in the reverse link can improve the C/I ratio satisfaction upto 45%.