without these of microcells : we see this are a contains 5 Bs and each Bs has 60 ch. So, total number of channels =5×60=300 channels
with the use of microcells the Bs A is surrounded by 6 microcells there for , the total number of channels =(5+6)×60=660 ch
Total the Bs is replaced with microcells =(5+12)×60=1,020 ch.