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<h2>Functional requirements and restrictions</h2>

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<h3>BTS
hardware requirements</h3>

<p>EDGE TRXs and EDGE baseband units (BB2E/BB2F) are required
for implementing Smart Radio Concept (SRC) in the Nokia UltraSite EDGE BTS.</p>
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<h3>BTS
software requirements</h3>

<p>CX3.0 onwards is required for SRC.</p>
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<h3>Restrictions</h3>

<ul>
<li><p>Intelligent Downlink Diversity (IDD)
sector cannot share a cabinet with a baseband (BB) hopping sector or antenna
hopping sector, because IDD uses the BB hopping hardware in a different mode.</p>
</li>
<li><p>IDD sector with radio frequency (RF)
hopping is possible, IDD sector (with or without RF hopping) can share a cabinet
with an RF hopping sector and/or another IDD sector.</p>
</li>
<li><p>Sector using both IDD and BB hopping
is not possible.</p>
</li>
<li><p>IDD with MetroSite is not possible</p>
</li>
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