The interference/jamming condition can be declared when the
gain difference of channels from the serving HeNB and the
interfering HeNB exceeds a pre-set threshold [9]. Instead of
using a pre-set threshold for defining the interference/jamming
condition, we consider a directed edge between any two HeNBs
to cover all possible interference conditions. It is worth noting
that in enterprise environments, the interference graph does not
change frequently since enterprise femtocells are usually static
unless some of them are intentionally moved or shut down
(unlike the ad-hoc nature of home femtocell environments).