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<h1>Variable DL Power Control</h1>

<p>The BSC has a variable power change step size for increasing
and decreasing the MS transmission power and for increasing the BTS transmission
power. This is used in situations where the required power change is so large
that by using the fixed power change step size the power change would require
several power control commands and take a long time. Using the variable power
change step size it is possible to reach the required power level in one go.</p>


<p>The existing downlink power control mechanism does not
adapt to the environment adequately. Therefore a modification is required
to ensure that an optimal DL power control is applied to the network and a
maximum capacity gain from the FH can be acquired.</p>


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<h2>Variable
DL power reduction step size</h2>

<p>The current DL power control algorithm steps the power
down by only a fixed reduction step. However in some situations, more aggressive
power reductions are needed. This feature calculates the reduction step sizes
according to the current signal strength and quality of the connection. Therefore,
if the level of the signal strength is high enough or if the quality is excellent,
bigger reduction steps (even 10 dB) can be used. Otherwise, normal reduction
steps are used.</p>


<p>The variable power step algorithm adapts to the current
radio environment faster than the normal one and therefore decreases the overall
interference because unnecessarily high BTS transmission power is not used.</p>
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