for the same experimental setup. We determined the TTR
for varying averaging window sizes of the SCF and three
different settings of the control channel duty cycle, where
the duty cycle represents the percentage of time that the
control channel is active as a fraction of the total observation
time. We determined the relative throughput for three different
settings of the spectrum availability determination period: 90,
60 and 30 seconds, where the 60 second spectrum availability
determination period is mandated for mode II personal/portable
devices by the US regulator [5].