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<h2>Spectrum capacity features</h2>

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<h3>IUO/IFH</h3>

<p>The Intelligent Underlay Overlay (IUO) feature is designed
to allow tighter reuse of radio frequencies in the network.</p>


<p>IFH is an IUO with the possibility of frequency hopping
in both regular layer and super-reuse layer IUO TRXs.</p>


<ul>
<li><p>IFH/IUO cannot be used with HSCE/ICE+
feature.</p>
</li>
<li><p>IFH/IUO can be used in Dual Band.</p>
</li>
<li><p>IFH/IUO can be used with Common BCCH
with restrictions:</p>


<ul>
<li><p>The Child Cell concept is not supported
in BSC with Common BCCH.</p>
</li>
<li><p>Direct Access to the super reuse layer
is only supported inside the BTS_Object with the initial SDCCH, which must
be in the BCCH band.</p>


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<dl class="note-notification">
<dt class="note-caption">Note</dt>
<dd>The initial SDCCH is usually in the BCCH BTS_Object.</dd>
</dl>
</li>
</ul>
</li>
<li><p>IFH/IUO can be used with FACCH Call
Setup.</p>
</li>
<li><p>IFH/IUO can be used with Dynamic SDCCH.</p>
</li>
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