A cellular system is composed of both macrocells and femtocells. There are a total of 200 voice channels available. Suppose a network engineer decided to implement frequency reuse by using a fixed partition of frequencies, some to the macrocells and the rest to femtocells. Macrocells use cluster sizes of 4 and 3 sectors per cell. Femtocells use cluster sizes of 1 and no sectoring; this assumes femtocells do not interfere with neighboring femtocells.

If 20 channels are assigned to each femtocell, how many channels (both macrocell and femtocell channels) are potentially available to a mobile at every location?

From part a, if there are 20 macrocells and 20 femtocells in the area, what is the total system capacity?

From part a, if the femtocells are assigned to closed subscriber groups, how many channels are available to those who are not in the closed subscriber groups?

Instead of the results from part a, how should the channels be distributed if at least 68 channels should be available to a mobile in a femtocell?