
Example-Case Study of Using Resource Trading in Femtocell Networks 47
WF
m
WF
f
WF
EDQGZLGWK
Figure 2.12: The spectrum allocation in a cell.
where P
lf
and P
cf
represent the linear and constant parts of the power con-
sumption of FAPs, respectively, b is a constant, P
txf
is the transmitting power
of FAPs. However, the components of P
lf
and P
cf
are different from P
lm
and
P
cm
, respectively. For example, there is no cooling device for FAPs.
According to the above analyses of BSs’ and FAPs’ power consumptions,
we can obtain the entire downlink power consumption P
system
as follows:
P
system
= P
M
+ N
f
P
F
(2.25)
where P
M
and P
F
are given by Eq. (2.23) and Eq. (2.24), respectiv