Joint optimization of the key system parameters, such as range expansion bias, power reduction factor, scheduling thresholds, and duty cycle of reduced power subframes, is performed to achieve maximum aggregate capacity and proportional fairness among users.
Joint optimization of range expansion bias, power reduction factor, scheduling thresholds, and duty cycle of reduced power subframes is performed to study the trade-offs between aggregate capacity of a cell and fairness among the users.
The threshold value of duty cycle is [ D min,D max], which is set to 10%% as a fixed value in the initial phase.
It was also found that the choice of the detection threshold would significantly affect the duty cycle as GSM 900 and 1800 give exponential decay with increase in detection threshold while TV band shows very sharp exponential decay which becomes invariant after −85 dBm.
Hence, fixing the duty cycle and optimizing the scheduling thresholds is preferable since it avoids the overhead of coordinating the duty cycle among the cells through the X2 interface.
Using these results, insights are developed on the configuration of FeICIC parameters, such as the power reduction level, range expansion bias, duty cycle of CSFs, and scheduling thresholds.
The main weakness of the abovementioned approaches is that both channel occupancy and duty cycle data are sensitive to the employed γ threshold and, thus, prone to miss detection and false-alarm errors jeopardizing the accuracy of the obtained results.
In order to reduce the output per second while still being able to reflect the actual usage of a channel, the channel duty cycle was measured with −70 dBm as the detection threshold.
When the appropriate threshold is selected (a value that is slightly above the noise floor), the duty cycle mode can be a powerful tool to detect transient signals.
When the appropriate threshold is selected (a value that is slightly above the noise floor), the duty cycle mode can be a powerful tool to detect transient signals. .
