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<h1>Configuring Intelligent Downlink Diversity (IDD)</h1>

<p><a href="NED?action=retrieve&amp;identifier=dn03317131&amp;edition=3&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_2#ned_2" onclick="sync(this);return true" shape="rect">Functional requirements and restrictions</a></p>


<p><a href="NED?action=retrieve&amp;identifier=dn03317131&amp;edition=3&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_3#ned_3" onclick="sync(this);return true" shape="rect">Supported configurations</a></p>


<p><a href="NED?action=retrieve&amp;identifier=dn03317131&amp;edition=3&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_4#ned_4" onclick="sync(this);return true" shape="rect">Configuring the BTS to IDD mode with BTS Manager</a></p>


<p><a href="NED?action=retrieve&amp;identifier=dn03317131&amp;edition=3&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_5#ned_5" onclick="sync(this);return true" shape="rect">Configuring IDD at the BSC</a></p>


<p><a href="NED?action=retrieve&amp;identifier=dn03317131&amp;edition=3&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_6#ned_6" onclick="sync(this);return true" shape="rect">Alarm handling</a></p>


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<h2>RX antenna supervision and IDD/4UD</h2>

<p>RX antenna supervision can be used in UltraSite configurations.
If 4UD is not used, <a href="NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id013928#id013928" onclick="openSmallPopup(event,'NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id013928#id013928');return false" shape="rect" target="_blank">RSSI</a> values for RX antenna supervision
are requested only from the main TRXs. If 4UD is used, RSSI values can be
requested from the main and auxiliary TRXs. RX antenna supervision will know
the IDD and 4UD configuration.</p>
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<p><a href="NED?action=retrieve&amp;identifier=dn03317131&amp;edition=3&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_7#ned_7" onclick="sync(this);return true" shape="rect">Object state management</a></p>


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<h2>(BCCH) reconfiguration</h2>

<p>Reconfiguration happens when the BSC sends a new BTS_CONF_DATA
message to the BTS due to some fault situation. From the IDD TRX point of
view it means that the channel configuration of the TRX is changed or the <a href="NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id08851#id08851" onclick="openSmallPopup(event,'NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id08851#id08851');return false" shape="rect" target="_blank">ARFN</a> of the TRX is changed. During an ARFN change
both the IDD main and auxiliary TRX and, if <a href="NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id010015#id010015" onclick="openSmallPopup(event,'NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id010015#id010015');return false" shape="rect" target="_blank">RTC</a>s
are used, corresponding cavities from both RTCs have to be tuned to the new
frequency.</p>
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<p><a href="NED?action=retrieve&amp;identifier=dn03317131&amp;edition=3&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_8#ned_8" onclick="sync(this);return true" shape="rect">TRX tests</a></p>
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