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<div class="div">
<h1>Implementing GSM-WCDMA Inter-System Handover</h1>

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<h2>Before you start</h2>

<p>Check that all network elements involved are GSM-WCDMA
Inter-System Handover capable. See <a href="NED?action=retrieve&amp;identifier=dn03275625&amp;edition=4&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_top#ned_top" onclick="sync(this);return true" shape="rect">System impact for GSM-WCDMA Inter-System
Handover</a> and <em>Testing BSS10101 and BSS11107: GSM-WCDMA
Interworking</em> in BSC/TCSM documentation.</p>


<p>With NetAct Radio Access Configurator tools it is possible
to manage inter-system adjacencies and the related parameters. For more information,
see <em>Managing Adjacencies</em> in NetAct documentation.</p>


<p>Make sure that all interfaces between BTS, BSC, 3G MSC,
RNC and WBTS and also network elements are configured and working properly.
Also make sure that both the optional features and software packets, which
are required for enabling GSM-WCDMA interworking functionality, are activated
and in use in each participating network element.</p>


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<dl class="note-notification">
<dt class="note-caption">Note</dt>
<dd>GSM-WCDMA Inter-System Handover is application software
in the BSC. It is always active if the operator has deployed it in the network.
It has no effects on hardware or firmware.</dd>
</dl>
</div>
</div>


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<h2>Steps</h2>

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Expand/collapse all</span></p>
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<ol class="type-odd">
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<h3>Define the incoming
and outgoing adjacencies (EAE).</h3>
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<h3>Check that ISHO_SUPPORT_IN_BSC
is in use in the BSC (WOS).</h3>
</div>
</li>
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<div class="action-in-detail">
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<p class="title"><span class="block-title" onclick="expandBlock('block1'); return false"><layer visibility="hide"><img alt="Expand/collapse" border="0" class="ExpColl" name="block1Title" src="NED?action=retrieve&amp;identifier=dn01157982&amp;edition=1&amp;language=none&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /></layer> Check that BSC_GPRS_PARAM_ENABLED
is in use in the BSC (WOS).</span></p>
</div>


<div class="text" id="block1Text">
<ul>
<li><p><em>if BSC_GPRS_PARAM_ENABLED
is not in use:</em> </p>


<p>WCDMA-related packed idle mode parameters are not visible
and modifiable.</p>


<p>All WCDMA capable MSs use the WCDMA-related GSM idle mode
parameters broadcast on the BCCH.</p>


<p>Both dual mode and tri-mode MSs use the following WCDMA
cell selection parameters:</p>


<ul>
<li><p><span class="parameter-sem">FDD
Cell Reselect Offset</span></p>


<p>With this parameter you can adjust the attractiveness between
GSM cells and neighbour WCDMA cells. High negative offset value enables cell
re-selections for WCDMA capable mobiles from high signal quality GSM cells
to relatively weaker neighbour WCDMA cells.</p>
</li>
<li><p><span class="parameter-sem">Minimum
FDD Threshold</span></p>


<p>With this parameter you can define a minimum DL signal
quality requirement for the neighbour WCDMA cell re-selections.</p>
</li>
</ul>
</li>
<li><p><em>if BSC_GPRS_PARAM_ENABLED
is in use</em>: </p>


<p>You can adjust the WCDMA-related packet idle mode parameters
that affect only the tri-mode GSM/GPRS/WCDMA MSs.</p>


<p>In packet idle mode, the tri-mode MSs use the following
WCDMA cell selection parameters broadcast on the PBCCH:</p>


<ul>
<li><p><span class="parameter-sem">GPRS
Fdd Cell Reselect Offset</span></p>


<p>With this parameter you can adjust the attractiveness between
GSM cells and neighbour WCDMA cells.</p>
</li>
<li><p><span class="parameter-sem">GPRS
Minimum FDD Threshold</span></p>


<p>With this parameter you can define a minimum DL signal
quality requirement for the neighbour WCDMA cell re-selections.</p>
</li>
</ul>


<p>In order for these parameters to take effect, the PBCCH
must also be broadcast on the serving GSM cell.</p>


<p>If the PBCCH is not provided by the GSM network or a tri-mode
MS is in GSM idle mode, the MS uses the mutual WCDMA cell selection parameters
broadcast on the BCCH.</p>
</li>
</ul>
</div>
</div>
</li>
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<div class="action-in-short">
<h3>Check that ISHO_SUPPORT_IN_BSC
ACTIVATED is in use (WOS).</h3>
</div>
</li>
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<div class="action-in-detail">
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<div>
<p class="title"><span class="block-title" onclick="expandBlock('block2'); return false"><layer visibility="hide"><img alt="Expand/collapse" border="0" class="ExpColl" name="block2Title" src="NED?action=retrieve&amp;identifier=dn01157982&amp;edition=1&amp;language=none&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /></layer> Take <em>Inter-system
handover and UMTS changes in MSC</em> into use.</span></p>
</div>


<div class="text" id="block2Text">
<p>For more information, see <em>FEATURE 1260:
Inter-system handover and UMTS changes in MSC</em> in MSC documentation.</p>


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<dl class="note-notification">
<dt class="note-caption">Note</dt>
<dd>For Inter-PLMN handovers, Feature 1168: Multiple PLMN and
Inter-PLMN  handover support in MSC must be in use. For more information,
see <em>Feature 1168: Multiple PLMN and Inter-PLMN Handover
Support in MSC</em> in MSC documentation.</dd>
</dl>
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</li>
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<p class="title"><span class="block-title" onclick="expandBlock('block3'); return false"><layer visibility="hide"><img alt="Expand/collapse" border="0" class="ExpColl" name="block3Title" src="NED?action=retrieve&amp;identifier=dn01157982&amp;edition=1&amp;language=none&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /></layer> Test the activation
in BSC.</span></p>
</div>


<div class="text" id="block3Text">
<p>See <em>Testing BSS10101 and BSS11107: GSM-WCDMA
Interworking</em> in BSC/TCSM documentation.</p>
</div>
</div>
</li>
</ol>
</div>


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<h2>Further information</h2>

<p>For an overview, see <a href="NED?action=retrieve&amp;identifier=dn02210994&amp;edition=5&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=nov1521223413#nov1521223413" onclick="sync(this);return true" shape="rect">Overview of GSM-WCDMA Inter-System Handover</a>.</p>
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