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<h3>WCDMA-GSM inter-system handover triggers</h3>

<p>For inter-system handovers, the RNC commands the UE to
start compressed mode and make the measurements of the GSM network and report
the results back to the RNC. Based on these measurement reports from the UE,
the RNC makes a handover decision and initiates resource reservation from
the GSM BSC.</p>


<p>The main handover triggers for the uplink and downlink
are:</p>


<ul>
<li><p>Inter-system handover (or cell re-selection)
to GSM due to Downlink DPCH power</p>
</li>
<li><p>Inter-system handover (or cell re-selection)
to GSM due to Uplink DCH quality</p>
</li>
<li><p>Inter-system handover (or cell re-selection)
to GSM due to UE Tx power</p>
</li>
<li><p>Inter-system handover (or cell re-selection)
to GSM due to CPICH RSCP</p>
</li>
<li><p>Inter-system handover (or cell re-selection)
to GSM due to CPICH Ec/No </p>
</li>
</ul>


<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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