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<title>GSM/EDGE-WCDMA Inter-System NCCR Cell Re-selection (IS-NCCRS)
criteria and algorithms</title>
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<h1>GSM/EDGE-WCDMA Inter-System NCCR Cell Re-selection (IS-NCCRS)
criteria and algorithms</h1>

<p>Inter-System Network-Controlled Cell Re-selection uses two criteria:
coverage and service priority.</p>


<p>The coverage criterion enables the operator to set whether <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=id016172#id016172" 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=id016172#id016172');return false" shape="rect" target="_blank">IS-NCCRS</a>
is started as soon as WCDMA <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=id010817#id010817" 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=id010817#id010817');return false" shape="rect" target="_blank">FDD</a> cell coverage is available, or
whether IS-NCCRS is done only when GSM coverage is ending.</p>


<p>In service priority criterion, the actual configuration of the GSM/EDGE
versus WCDMA FDD prioritisation for different services is done in the core
network. The PCU follows the core network prioritisation information received
in the Service UTRAN CCO information element.</p>


<p>In target WCDMA FDD cell prioritisation, 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=id014238#id014238" 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=id014238#id014238');return false" shape="rect" target="_blank">PCU</a>
ranks the target cell candidates based on the reported <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=id04778#id04778" 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=id04778#id04778');return false" shape="rect" target="_blank">Ec/No</a>
value.  The figure illustrates the priority order of the IS-NCCRS criteria.</p>


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<img alt="urn:mars:dn04194078:5:en:global:cgm_fixed:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn04194078&amp;edition=5&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: Priority order of cell re-selection criteria</p>
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<div class="related-topics">
<h2>Related Topics</h2>

<ul class="related-topics-list">
<li><a href="NED?action=retrieve&amp;identifier=dn04111132&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=sep2341624741#sep2341624741" onclick="sync(this);return true" shape="rect">Overview of GSM/EDGE-WCDMA
Inter-System NCCR (IS-NCCRS)</a></li>
<li><a href="NED?action=retrieve&amp;identifier=dn04109346&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=jun224151451#jun224151451" onclick="sync(this);return true" shape="rect">System
impact of GSM/EDGE-WCDMA Inter-System NCCR (IS-NCCRS)</a></li>
<li><a href="NED?action=retrieve&amp;identifier=dn04111705&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=sep23416212265#sep23416212265" onclick="sync(this);return true" shape="rect">Overview
of implementing GSM/EDGE-WCDMA Inter-System NCCR (IS-NCCRS)</a></li>
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