Table 1 Selection of the guard bands according to the spectrum usage values (EspUti) of the network for Cost239 and NSFNet topologies

GB = 1

EspUti ≥0.35

EspUti ≥0.49

GB = 2

0.35 > EspUti ≥0.30

0.49 > EspUti ≥0.42

GB = 3

0.30 > EspUti ≥0.25

0.42 > EspUti ≥0.35

GB = 4

0.25 > EspUti ≥0.20

0.35 > EspUti ≥0.28

GB = 5

0.20 > EspUti ≥0.15

0.28 > EspUti ≥0.21

GB = 6

0.15 > EspUti ≥0.10

0.21 > EspUti ≥0.14

GB = 7

0.10 > EspUti ≥0.05

0.14 > EspUti ≥0.07

GB = 8

EspUti <0.05

EspUti <0.07