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<h3>Features used during call set-up</h3>

<p>If the call can be transferred from a GSM 900/800 cell
to a GSM 1800/1900 cell during the call set-up  (that is, on SDCCH), less
of the GSM 900/800 capacity is wasted, as compared to a case where the call
is first set up on the GSM 900/800 layer and then transferred to a GSM 1800/1900
cell. The mechanisms for initiating the SDCCH handover are Direct Access to
the Desired Layer feature or the normal Directed Retry.</p>


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<h4>Direct
Access to the Desired Layer</h4>

<p>The existing priority and load factor concept can be used
together with the Direct Access to the Desired Layer feature. The call can
be directed during the call set-up to the layer having the highest priority,
for example, the 1800/1900 layer. By using the load factors, it is possible
to prevent the layer with the highest priority from being blocked. If the
load increases over the predefined threshold, new priorities are calculated
to favour the less occupied layer. </p>


<p>The following parameters are related 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=id011216#id011216" 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=id011216#id011216');return false" shape="rect" target="_blank">Direct
Access to the Desired Layer</a>:</p>


<ul>
<li><p><span class="parameter-sem">MinTimeLimitDR</span></p>


<p> This parameter determines the period starting from the
assignment request during which the target cell evaluation for the directed
retry handover is not allowed. Range: 1..14 (s).</p>
</li>
<li><p><span class="parameter-sem">MaxTimeLimitDR</span></p>


<p> This parameter determines the maximum time period starting
from the assignment request during which the target cell evaluation for the
directed retry handover is allowed. Range: 0..15 (s).</p>
</li>
<li><p><span class="parameter-sem">BTSLoadThreshold</span></p>


<p> DADL/B is applied if DADL/B is enabled in the BSC and
if the load of the accessed cell is higher than the <span class="parameter-sem">BTSLoadThreshold</span>
defined for the accessed cell and there are adjacent cells defined as DADL/B
handover target cells with the <span class="parameter-sem">DADL/BTargetCell(n)</span>
parameter. Range: 0..100%.</p>
</li>
<li><p><span class="parameter-sem">DADL/BTargetCell</span></p>


<p>Adjacent cells handled by the BSC, considered as DADL/B
target cells with a signal level exceeding <span class="parameter-sem">HOLevelUmbrella</span>,
are sorted according to the adjacent cell priority and load factor (<span class="parameter-sem">HOPriorityLevel</span>
or <span class="parameter-sem">HOPriorityLevel(n)</span> - <span class="parameter-sem">LoadFactor(n)</span>
(if the adjacent cell is loaded) to be used as target cells for the DADL/B
handover. Range: Y/N.</p>
</li>
<li><p><span class="parameter-sem">HoLevelUmbrella</span></p>


<p> This parameter defines the minimum level for the <span class="parameter-sem">DADL/BTargetCell</span> to be selected. The same parameter
is used for the umbrella and SMMS handover. Range: -110..-47 (dBm).</p>
</li>
</ul>


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<dl class="note-notification">
<dt class="note-caption">Note</dt>
<dd>If the cell is congested, a directed retry is triggered
and the network does not take into account the DADL/B feature.</dd>
</dl>
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<h4>Directed
Retry</h4>

<p>Directed Retry redirects an MS in a congested situation
to attempt access to another cell from a predefined list. The target cells
are ranked in the order of signal levels and the best is chosen for the handover.</p>
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