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<h2>GSM-WCDMA cell re-selection in idle state</h2>

<p>The main principle in the implementation of WCDMA RAN selection
handling is to enable an operator to define the WCDMA RAN measurement offsets
and cell re-selection thresholds by the RNC. They are sent to the mobile in
the System Information messages or/and in the Packet System Information messages.</p>


<p>A dual mode GSM/WCDMA mobile is able to perform a cell
re-selection from the GSM network to the WCDMA RAN network in the idle state
if the mobile is informed about the WCDMA RAN cells. The cell re-selection
is based on parameters sent by the BSC to the mobile.</p>


<p>The following must be taken into account when planning
re-selection from GSM to WCDMA RAN in idle state:</p>


<ul>
<li><p>A <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=id010855#id010855" 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=id010855#id010855');return false" shape="rect" target="_blank">WBTS</a> must be
defined as a neighbour WCDMA RAN cell for the BTS in the BSC. The following
BTS parameters must have proper values before mobile-originated cell re-selection
to WCDMA RAN is possible for a non-GPRS capable mobile:</p>


<ul>
<li><p><span class="parameter-sem">Threshold To
Search WCDMA RAN Cells</span></p>
</li>
<li><p><span class="parameter-sem">FDD Cell Reselect
Offset</span></p>
</li>
<li><p><span class="parameter-sem">Minimum FDD Threshold</span></p>
</li>
</ul>
</li>
<li><p>The BTS parameter <span class="parameter-sem">GPRS
Threshold To Search WCDMA RAN Cells</span>) must have a proper value before
mobile-originated cell re-selection to WCDMA RAN is possible for a GPRS capable
mobile which uses parameters received from the BCCH.</p>
</li>
<li><p>If the cell re-selection parameters
are sent on 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=id08956#id08956" 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=id08956#id08956');return false" shape="rect" target="_blank">PBCCH</a> for GPRS capable mobiles, the
following BTS parameters  must have proper values before mobile-originated
cell re-selection to WCDMA RAN is possible for a GPRS capable mobile:</p>


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


<p>Dual mode GSM/WCDMA mobiles start and stop measuring neighbour
WCDMA RAN cells according to the parameter: </p>


<ul>
<li><p><span class="parameter-sem">Threshold To
Search WCDMA RAN Cells</span></p>
</li>
</ul>


<p>Tri-mode GSM/GPRS/WCDMA mobiles start and stop measuring
neighbour WCDMA RAN cells according to the parameter:</p>


<ul>
<li><p><span class="parameter-sem">GPRS Threshold
To Search WCDMA RAN Cells</span></p>
</li>
</ul>


<p>The WCDMA RAN cell re-selection parameters are sent in
the messages:</p>


<ol class="type-odd">
<li type="1"><p>System Information Type 2quater</p>


<p>To non-GPRS capable mobiles and GPRS capable mobiles, if
PBCCH (Packet BCCH) is not allocated.</p>


<p>The content of this message is used only by non-GPRS capable
mobiles, if PBCCH is allocated.</p>
</li>
<li type="1"><p>Packet System Information Type 3quater</p>


<p>To GPRS capable mobiles, if PBCCH is allocated.</p>
</li>
</ol>


<p>You can prevent the neighbour WCDMA RAN cell measurements,
and thereby also the cell re-selections from a GSM cell to WCDMA RAN by adjusting
the values of the parameters which control the WCDMA RAN cell measurement
in the idle state. This is done by setting the value 15 for the following
parameters in the GSM cell:</p>


<ul>
<li><p><span class="parameter-sem">Threshold To
Search WCDMA RAN Cells</span> and/or</p>
</li>
<li><p><span class="parameter-sem">GPRS Threshold
To Search WCDMA RAN Cells</span></p>
</li>
</ul>


<p>If you want to get measurements about the neighbour WCDMA
RAN cells continuously and try to prevent the WCDMA RAN cell re-selections
from a GSM cell, you can do this by:</p>


<ol class="type-odd">
<li type="1"><p>setting the value 7 for the following
parameters in the GSM cell:</p>


<ul>
<li><p><span class="parameter-sem">Threshold To
Search WCDMA RAN Cells</span></p>
</li>
<li><p><span class="parameter-sem">GPRS Threshold
To Search WCDMA RAN Cells</span></p>
</li>
</ul>
</li>
<li type="1"><p>and by setting the value -6 dB for
the following parameters:</p>


<ul>
<li><p><span class="parameter-sem">GPRS Minimum
FDD Threshold</span></p>
</li>
<li><p><span class="parameter-sem">Minimum FDD Threshold</span></p>
</li>
</ul>
</li>
<li type="1"><p>and by setting the value -28 dB for
the following parameters:</p>


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


<p><a href="NED?action=retrieve&amp;identifier=dn03530043&amp;edition=3&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_3#ned_3" onclick="sync(this);return true" shape="rect">Cell re-selection with non-GPRS capable mobiles</a></p>


<p><a href="NED?action=retrieve&amp;identifier=dn03530043&amp;edition=3&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_4#ned_4" onclick="sync(this);return true" shape="rect">Cell re-selection with GPRS capable mobiles</a></p>
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