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<h2>Interworking with other features</h2>

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<h3>Direct Access to Desired Layer/Band</h3>

<p>Direct Access to Desired Layer/Band (DADL/B) can be used in the dual
band environment to direct calls from a stand-alone dedicated control channel
(SDCCH ) of the accessed cell to a traffic channel (TCH ) of another cell
which is allocated from the other frequency band than the accessed cell. This
is possible if Dual Band is activated.</p>


<p>DADL/B is separate software and does not affect the operation of Dual
Band.</p>
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<h3>Advanced Multilayer Handling</h3>

<p>Many operators build capacity by using micro cells or a dual band solution.
As the number of network layers increases, the number of handovers between
the layers also increase. When the traffic is low, that is, at night, extra
capacity is not needed and the underlay capacity is not necessarily needed
either. Therefore, the adequate capacity can be achieved by using only the
overlay network.</p>


<p>On the other hand, at night most of the traffic occurs outside, particularly
from fast moving vehicles. Furthermore, fast moving mobiles (FMMS) in the
micro cell network generate many handovers with a relatively high speed. Therefore,
it is more reasonable to keep the traffic in the overlay network instead of
the underlay network to provide better quality to end users.</p>


<p>Advanced Multilayer Handling (AMH) can be used to prevent the use of
the micro cell/GSM 1800 or GSM 1900 layer during low traffic and thus to keep
the mobiles only in the macro/GSM 900 or GSM 800 network, once they have camped
on it.</p>


<p>If the traffic load of the serving cell decreases under the predefined
threshold, he FMMS, MS Speed Detection and Umbrella handovers are not allowed
to the lower layer cells.</p>
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<h3>Intelligent
Underlay Overlay, Frequency Hopping and IFH</h3>

<p>To get the maximum capacity, <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=id09027#id09027" 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=id09027#id09027');return false" shape="rect" target="_blank">IUO</a>,
Frequency Hopping, and Intelligent Frequency Hopping can be used together
with Dual Band (in both layers of a dual band network, if necessary). Still,
some limitations must be noted when Dual Band is used together with the IUO
feature.</p>


<p>As IUO is a single-band feature, it can be disturbed by
the following dual band functionality. IUO relies on the same band interference
measurements. The more measurements are sent to the BSC, the more accurately
the C/I calculation ensures a reliable handover between the regular and the
super layers. As a dual band MS measures neighbours in both bands, less interference
is analysed, and the IUO efficiency could then be affected.</p>


<p>There are two solutions to overcome the measurement problem:</p>


<ul>
<li><p>The parameter <span class="parameter-sem">Dual
Band MS Access to IUO Layer</span>, which indicates whether dual band mobiles
are allowed to use the super reuse TCHs. By preventing the dual band MS from
accessing the super layer, the IUO performance does not get sacrificed.</p>
</li>
<li><p>The <span class="parameter-sem">Multiband
Cell Reporting</span> parameter has an effect on another band reporting of
a dual band mobile. This can be set to 1 in the IUO layer cells to allow the
dual band mobile to report only 1 measurement from the non-IUO layer. Thus,
the IUO efficiency is not greatly affected.</p>
</li>
</ul>


<p>If dual band mobiles cause interference in the IUO super
layer, it is advisable to use restrictions. Frequency Hopping does not bring
any special limitations when used together with Dual Band.</p>
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<h3>HSCSD,
GPRS and EDGE</h3>

<p>HSCSD, GPRS and EDGE do not bring any special limitations
to Dual Band itself. When considering the higher C/I requirement for data
services (if high data throughput is wanted), Dual Band can bring a flexible
solution to meet those tighter quality requirements. If a wider bandwidth
and less interference are expected in the GSM 1800/1900 layer, more data services
should be allocated for that band. The mobiles should naturally support a
dual band or single band GSM 1800/1900 functionality.</p>
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