where fMHz is the LTE carrier frequency.
For the access link in mmWave technology we consider the
path loss [23]:
L!!"#$%(d)=PL!+10∙α∙log!" d (4)
where PL0 is the free space Path Loss at 1 m (68 dB at 60
GHz), α is the exponential factor, and for a Line-of-Sight
indoor hall, α=2.17.
In all path loss models, d is the distance between the
serving access point (eNodeB or MFAP) and the considered
UE.
B. Capacity Analysis
In order to compare our proposal with those suggested in
the literature so far, as in [8-10] we estimated the instantaneous
achievable capacity on RB for an embedded UE (Cemb_UE) and
for an outside UE (Cout_UE). They are calculated according to
Shannon formula:
C=B∙log!(1+SINR) (6)
where SINR (Signal to Interference Plus Noise Ratio) is the
ratio between the signal power received from the serving node
(MFAP or eNodeB), and the total interfering power (I) due to
the other nodes transmissions, and the Thermal Noise (N), all
measured over the same bandwidth B considered.
The received power and the interfering power are obtained
from the transmitted power of the node and the path loss
models (1- 4) according to the type of the link. Moreover, the