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<td align="center" colspan="1" rowspan="1" width="20%"><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=ned_1#ned_1" onclick="sync(this);return true" shape="rect">System impact of GSM/EDGE-WCDMA Inter-system NCCR (IS-NCCRS)</a></td>
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<h2>Interworking with other features</h2>

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<h3>Activated
PCU/PCU2</h3>

<p>Before activating IS-NCCRS, there must be a PCU or PCU2
installed and active in the BSC, enabling the GPRS packet control functions.</p>
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<h3>GSM-WCDMA
Inter-System Handover (ISHO)</h3>

<p>IS-NCCRS requires the WCDMA neighbour cell definitions
to be broadcast to the MS. Thus, <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=id010124#id010124" 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=id010124#id010124');return false" shape="rect" target="_blank">ISHO</a> must be
installed and active in the BSC before implementing IS-NCCRS.</p>


<p>For more information, see <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-WCDMA Inter-System Handover</a>.</p>
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<h3>Network-Controlled
Cell Re-selection (NCCR)</h3>

<p>IS-NCCRS is an enhancement to <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=id016174#id016174" 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=id016174#id016174');return false" shape="rect" target="_blank">NCCR</a>.
NCCR must be active in the BSC before implementing IS-NCCRS.</p>


<p>For more information, see <a href="NED?action=retrieve&amp;identifier=dn04111129&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=oct54175434#oct54175434" onclick="sync(this);return true" shape="rect">Overview
of Network-Controlled Cell Re-selection (NCCR)</a>.</p>
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<h3>PCU
memory, overload protection, and capacity enhancement</h3>

<p>NCCR enhances the PCU overload protection in two ways.
In a lower-level PCU overload situation, NCCR reduces the PCU load by ignoring
every second measurement report sent by the NCCR-controlled MSs. In a higher-level
PCU overload situation, NCCR moves the MSs from network-controlled to autonomous
cell re-selection. This is done one by one as the measurement reports are
received from the MSs. </p>
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