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<h3>Cell re-selection with non-GPRS capable mobiles</h3>

<p>The System Information messages enabling the cell re-selection
with non-GPRS capable mobiles are sent by the network to the mobiles. The
inter-system cell re-selection requires the sending of a new System Information
message: SI 2quater. The cell re-selection parameters that are sent on SI
2quater messages for non-GPRS capable mobiles are:</p>


<ul>
<li><p><span class="parameter-sem">Threshold To
Search WCDMA RAN Cells</span></p>
</li>
<li><p><span class="parameter-sem">Minimum FDD Threshold</span></p>
</li>
<li><p><span class="parameter-sem">FDD Cell Reselect
Offset</span></p>
</li>
</ul>


<p>The set below is repeated for every neighbour WCDMA RAN
cell:</p>


<ul>
<li><p><span class="parameter-sem">WCDMA Downlink
Carrier Frequency</span></p>
</li>
<li><p><span class="parameter-sem">Downlink Transmission
Diversity</span></p>
</li>
<li><p><span class="parameter-sem">Scrambling Code</span></p>
</li>
</ul>


<p>Parameters from the SI 2quater messages allow the mobile
to build lists which are used for measurement reporting.</p>


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<h4>Algorithm
for cell re-selection</h4>

<p>You can control the measurements for re-selection by the
parameter <span class="parameter-sem">Threshold To Search WCDMA RAN Cells</span>.
The parameter defines a threshold and also indicates whether these measurements
are performed when RLA_C (a running average of received signal level) of the
serving GSM cell is below or above the threshold.</p>


<p>If the broadcast neighbour cell list from the BSC to the
mobile contains information on the WCDMA RAN cells, the mobile updates the
value RLA_C for the serving cell and each of the minimum of six strongest
non-serving GSM cells at least every five seconds.</p>


<p>The mobile reselects a suitable WCDMA RAN cell, if its
measured RSCP value exceeds the value of RLA_C for the serving cell and all
of the suitable non-serving GSM cells. The mobile also selects all of the
suitable non-serving GSM cells by the value <span class="parameter-sem">FDD Cell
Reselect Offset</span> for a period of five seconds. For FDD the mobile selects
the WCDMA cells, whose measured Ec/No value is equal or greater than the value
minimum fdd threshold. In case a cell re-selection occurs within the previous
15 seconds, <span class="parameter-sem">FDD Cell Reselect Offset</span> is increased
by 5 dB, where:</p>


<ul>
<li><p>Ec/No and RSCP are the measured quantities</p>
</li>
<li><p><span class="parameter-sem">Minimum FDD Threshold</span>
and <span class="parameter-sem">FDD Cell Reselect Offset</span> are broadcast on
BCCH of the serving cell</p>
</li>
</ul>


<p>If more than one WCDMA RAN cells fulfil the above criteria,
the mobile selects the WCDMA RAN cell with the greatest RSCP value.</p>


<a name="nov142114923" shape="rect"></a>
<dl class="note-notification">
<dt class="note-caption">Note</dt>
<dd><p>The parameters that are required to determine whether the
WCDMA cell is suitable are broadcast on BCCH of the WCDMA RAN cell. A mobile
may start re-selection towards the WCDMA RAN cell before decoding the BCCH
of the WCDMA RAN cell. If the WCDMA RAN cell is not suitable, this leads to
a short interruption of service. </p>



<p>After the mobile has re-selected a GSM cell from an WCDMA
RAN cell there is a five-second pause to the cell re-selection to WCDMA RAN.</p>
</dd>
</dl>


<a name="nov2721641131" shape="rect"></a>
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<img alt="urn:mars:dn02247187:1:en:global:cgm_fixed:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn02247187&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: Cell re-selection process (Non-GPRS capable phone)</p>
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