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<h2>Mixed transmit power, coverage or frequency</h2>

<p>Many BTS configurations have TRXs that differ in power,
coverage, and/or frequency band serving the same general coverage area.</p>


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<div class="topic">
<h3>ICE,
ICE+, HSCE</h3>

<p>The ICE feature used separate cells (separate BCCHs) for
high and low power TRXs. The ICE+ configuration (in [BSS9 and later]) extended
the ICE feature, so that the high and low power TRXs could be put in a single
cell (a single BCCH) by using the HSCE feature in the BSC to allocate mobiles
to suitable (low power or high power) TRX.</p>


<p>Only the ICE+ configuration (single BCCH) should now be
used in networks.</p>


<ul>
<li><p>HSCE uses the same code and parameters
as the ECFH feature (see below). It is not possible to set up both HSCE and
ECFH within the same cell.</p>
</li>
<li><p>HSCE can be used with Dual Band.</p>
</li>
<li><p>HSCE/ICE+ can be used with Common BCCH.
Direct Access to the super reuse layer is only supported inside the BTS_Object
with the initial SDCCH, which must be in the BCCH band.</p>
</li>
<li><p>HSCE/ICE+ cannot be used with IUO/IFH.</p>
</li>
<li><p>HSCE can be used with FACCH Call Setup
and Dynamic SDCCH.</p>
</li>
</ul>
</div>


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<h3>ECFH</h3>

<p>The ECFH feature was specified so that the mobiles using
Full Rate (FR) speech and needing maximum coverage were allocated to RF Hopping
TRXs - not the BCCH TRX - in cells where all TRXs had the same Tx power.</p>


<ul>
<li><p>ECFH uses the same code and parameters
as the HSCE feature (see above). It is not possible to set up both HSCE and
ECFH within the same cell.</p>
</li>
<li><p>ECFH can be used with Dual Band.</p>
</li>
<li><p>ECFH can be used in the BCCH BTS_Object
(sector) of a Common-BCCH cell.</p>
</li>
<li><p>ECFH cannot be used with IUO/IFH.</p>
</li>
<li><p>ECFH can be used with FACCH Call Setup
and Dynamic SDCCH.</p>
</li>
</ul>
</div>


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<div class="topic">
<h3>Dual
Band</h3>

<p>The Dual Band feature (in BSS 9 and later) uses separate
cells (separate BCCHs) for different frequency TRXs, with the Direct Access
to Desired Layer/Band feature to facilitate call setup.</p>


<p>Dual Band can be used for the Macrocell/Microcell network
control (a separate band for each layer), or for the controlling of the Macrocell
network using two frequency bands.</p>


<p>For Macrocell sites with the TRXs of both bands synchronised,
the Common BCCH feature is now recommended in place of Dual Band because only
a single BCCH is needed. Dual Band can be used with the following features:</p>


<ul>
<li><p>ICE+/HSCE</p>
</li>
<li><p>ECFH</p>
</li>
<li><p>Common BCCH</p>
</li>
<li><p>IUO/IFH</p>
</li>
<li><p>FACCH Call Setup</p>
</li>
<li><p>Dynamic SDCCH</p>
</li>
</ul>
</div>


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<h3>Common
BCCH/Multi BCF</h3>

<p>The segment features Common BCCH Control and Multi BCF
Control enable a general way to set up a cell (a single BCCH) with TRXs of
different bands and in different cabinets.</p>


<ul>
<li><p>HSCE/ICE+ can be used with Common BCCH;
however, the direct access functionality of HSCE/ICE+ is not supported.</p>
</li>
<li><p>ECFH can be used in the BCCH BTS_Object
of a Common BCCH cell.</p>
</li>
<li><p>Dual Band can be used with Common BCCH.</p>
</li>
<li><p>IUO/IFH can be used with Common BCCH,
but with restrictions; see IUO/IFH.</p>
</li>
<li><p>FACCH Call Setup can be used in the
BCCH BTS_Object of Common BCCH.</p>
</li>
<li><p>Dynamic SDCCH can be used in the BCCH
BTS_Object of Common BCCH.</p>
</li>
</ul>


<p><em>Common BCCH Notes</em></p>


<ol class="type-odd">
<li type="1"><p>FACCH Call Setup and Dynamic SDCCH
can also be used in a Common BCCH BTS_Object which is in the same frequency
band and is of the same site type as the BCCH BTS_Object.</p>
</li>
<li type="1"><p>Channel allocation to BTS_Objects within
1 BCF that are for the same band but different power levels does not take
into account the different power levels.</p>
</li>
<li type="1"><p>With Common BCCH using two frequency
bands, the BCCH should be located in the lower band for best performance.</p>
</li>
</ol>
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