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<div class="div">
<h2>WCDMA-GSM handover process</h2>

<p>When a radio access bearer is handed over from one system
to another, both the core network and the target RNC (or BSC) are responsible
for adapting the QoS (Quality of Service) parameters of the radio access bearer
according to the target (GSM or WCDMA) system.</p>


<p>In the case of a network-initiated cell re-selection from
WCDMA to GSM/GPRS, the RNC sends a cell change command to the MS which then
is responsible for actually transferring the existing packet-switched connection
to the target GSM/GPRS network. </p>


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<p>There is an option to restrict inter-system handovers for
voice and data services by the use of the RNC parameters found in table below.
However, for the launch network there is no foreseen reason to restrict any
particular service.</p>


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<th colspan="1" rowspan="1" valign="top"><p>Parameter</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>Setting</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>Condition</p>
</th>
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<td colspan="1" rowspan="1"><p><span class="parameter-sem">GsmHandoverAMR</span></p>
</td>
<td colspan="1" rowspan="1"><p>1</p>
</td>
<td colspan="1" rowspan="1"><p>Yes</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p><span class="parameter-sem">GsmHandoverCS</span></p>
</td>
<td colspan="1" rowspan="1"><p>0</p>
</td>
<td colspan="1" rowspan="1"><p>No (unmodifiable)</p>
</td>
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<td colspan="1" rowspan="1"><p><span class="parameter-sem">GsmHandoverNrtPS</span></p>
</td>
<td colspan="1" rowspan="1"><p>1</p>
</td>
<td colspan="1" rowspan="1"><p>Yes</p>
</td>
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<td colspan="1" rowspan="1"><p><span class="parameter-sem">GsmHandoverRtPS</span></p>
</td>
<td colspan="1" rowspan="1"><p>1</p>
</td>
<td colspan="1" rowspan="1"><p>Yes</p>
</td>
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<p>The alternative values of the parameters are as follows:</p>


<div class="def-list">
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<th class="term" colspan="1" rowspan="1"><div class="term">
No</div>
</th>
<td class="def" colspan="1" rowspan="1"><div class="def">
Inter-system handover/Cell change to
GSM is not allowed for the particular service. The inter-system handover is
also prohibited if the service is part of a multiservice.</div>
</td>
</tr>
<tr>
<th class="term" colspan="1" rowspan="1"><div class="term">
Yes</div>
</th>
<td class="def" colspan="1" rowspan="1"><div class="def">
Inter-system handover/Cell change to
GSM is allowed for a particular service. In case of multiservice, an inter-system
handover must be allowed for all CS and PS services which participate in the
multiservice before the inter-system handover is possible.</div>
</td>
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<th class="term" colspan="1" rowspan="1"><div class="term">
Priority</div>
</th>
<td class="def" colspan="1" rowspan="1"><div class="def">
Inter-system handover/Cell change to
GSM is allowed for that particular service. The inter-system handover is also
allowed if the service is part of a multiservice.</div>
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<p><a href="NED?action=retrieve&amp;identifier=dn03530055&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">UE Tx power</a></p>


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<p><a href="NED?action=retrieve&amp;identifier=dn03530055&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">Low measured absolute CPICH Ec/No</a></p>
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