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<h2>Configuring the BTS to IDD mode with BTS Manager</h2>

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<h3>Defining
IDD configuration at the BTS</h3>

<p>Make sure that the desired BB2x and TSxB units have been installed and
the cables connected according to the figures in <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=mar63104006#mar63104006" onclick="sync(this);return true" shape="rect">Supported configurations</a>. Define
the same hardware and cabling configuration with the BTS HW Configurator.</p>


<p>Start the manual commissioning procedure with the BTS Manager.
The IDD and 4UD parameters are defined on the <span class="gui-component-sem">Set
Intelligent Downlink Diversity</span> page of the Commissioning Wizard. The
following IDD-related information per TRX needs to exist: usage of IDD, mode
of the IDD TRX: main/auxiliary and IDD partner TRX and 4UD usage. This information
has to be saved permanently to the BTS system data (to VTXA/BOI) so that it
is available after resets.</p>


<p>The BTS checks the validity of the configuration message
received from the BTS Manager. For example, both the main and auxiliary TRXs
have to belong to the same frequency band, both have to be EDGE-capable, and
the main and auxiliary TRXs have to be connected to different RTCs in case
of RTC configurations.</p>
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<h3>Adding
TRX to IDD configuration</h3>

<p>Adding an IDD TRX (main TRX and auxiliary TRX) has to be
carried out via the commissioning procedure. If the BTS is already commissioned,
you have to run the Undo Commissioning procedure first.</p>
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<h3>Removing IDD configuration</h3>

<p>If you want to return an IDD TRX  to ‘normal’ operation,
you have to undo the commissioning and redo it manually.</p>


<p>The BTS is first taken to local use, that is, the Abis has to be disconnected.
Both TRXs (IDD main TRX and IDD auxiliary TRX) have to be configured with
the BTS manager as normal TRXs. The Abis transmission has to be routed from
the BSC to the BTS for the new normal TRXs. The branching table at the BTS
has to be defined for the new normal TRX and the new TRX has to be defined
to the BSC.</p>
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<h3>Transmission</h3>

<p>The Abis transmission has to be defined only to the TRXs
defined at the BSC. Signaling and traffic timeslots are branched only to the
IDD main TRXs and normal TRXs. This can be done manually with the BTS Manager
or automatically by the Autoconfiguration. Autoconfiguration has knowledge
about which TRXs are auxiliary TRXs.</p>
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<h3>BTS
initialisation</h3>

<p>When the BTS starts up, it takes into account whether it
is configured to IDD (and 4UD) mode. IDD mode means that the BTS has at least
one main-auxiliary TRX pair. If SW downloading is needed when the BTS starts
up, new SW is also loaded to the auxiliary TRXs. If <code class="parameter-code">BTS_CONF_DATA</code> contains
definitions for TRXs, which have been defined to auxiliary mode during commissioning,
alarm <span class="alarm-sem">7606</span> with new alarm detail will
be activated. The alarm detail will indicate that <code class="parameter-code">BTS_CONF_DATA</code> contains definitions
for the TRX defined to IDD auxiliary mode. If <code class="parameter-code">BTS_CONF_DATA</code> contains pseudo BB-hopping
definition for the cells that have IDD TRX, <code class="parameter-code">BTS_CONF_DATA</code> has to be nacked with
the reason 'Invalid hopping mode'.</p>


<p> If the BTS has non-EDGE TRXs installed and is commissioned
to IDD mode, alarm <span class="alarm-sem">7606</span> will be activated
with the new alarm detail. The alarm detail will indicate that the TRX does
not support IDD mode.</p>


<p>In an RTC configuration, the main TRXs are connected to
one RTC and auxiliary TRXs are connected to other RTC. When an RTC configuration
is used, the RTC tuning of the IDD carriers (=IDD main and auxiliary TRX)
can be done simultaneously, as the IDD main and auxiliary TRXs are physically
connected to different RTCs. The transmission of dummy bursts can be activated
from both transmitters to the RTC cavities.</p>
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