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<h3>Coverage reduction</h3>

<p>The compressed mode also has an adverse effect on the coverage
for the cell, in particular on the UL coverage. This is due to the fact that
when the compressed mode is switched on, the power control must change its
operation point. This means that the transmitted power and outer-loop target
is increased by the value:</p>


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<p>The equation can be used both with puncturing or code splitting.
This increase of the power is needed because in the compressed mode, the same
data amount is transmitted during a shorter time than in the normal mode.
This would lead to a decrease in the coverage by the amount of the 10*log10((frame_length-gap_length)/frame_length).</p>


<p>The table presents a similar estimation for coverage reduction
as the one for the capacity. This implies that the coverage of a speech service
would suffer by a factor of 2.1 dB since the UE requires roughly 4.2 dB of
additional power to process the compressed mode. But this is strictly an estimation
based on assumption of average increase in EbNo.</p>


<p>The NRT users can, however, reduce their bit rates so that
the coverage reduction should not affect the NRT bearers, whereas Speech service
also has the possibility to reduce to lower AMR which does not require as
much increase in power as that for the SF/2.</p>


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<p>Table: Coverage reduction</p>


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<th colspan="1" rowspan="1" valign="top"><p>Assumption</p>
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<th colspan="1" rowspan="1" valign="top"><p>Effect to the coverage of real time services</p>
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<td colspan="1" rowspan="1"><p>Required Eb/N0 is 1.5 dB higher during compressed frames</p>
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<td colspan="1" rowspan="1"><p>1.5 dB reduced coverage</p>
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<td colspan="1" rowspan="1"><p>7-slot gap is used</p>
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<td colspan="1" rowspan="1"><p>10*log10(15/8)  = 2.7 dB reduced coverage </p>
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<td colspan="1" rowspan="1"><p>Every 2nd frame is compressed with 20 ms interleaving (speech) </p>
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<td colspan="1" rowspan="1"><p>4.2 dB / 2 = 2.1 dB reduced coverage </p>
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