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<h1>Functionality of Dynamic Frequency and Channel Allocation
(DFCA)</h1>

<p>The main DFCA functionality is located in the BSC. The DFCA channel
allocation algorithm in the BSC controls the radio channel assignments of
all DFCA TRXs in all BTSs controlled by the BSC.</p>


<p>The information related to the potential interference situation expected
for a certain connection comes mainly from mobile DL measurement reports.
Each mobile station (MS) on a dedicated channel sends measurement reports
to the BSC every 0.48 seconds. The measurement report contains the measured
signal level for the serving cell and those for the identified neighboring
cells as well as current link quality related measures. The neighbour cells
are identified by the BCCH frequency and the BSIC (Base Station Identification
Code).</p>


<p>However, because of the limited amount of information contained in the
measurement report provided by the MSs, a statistical estimation of the interference
situation is implemented. This is done by means of a Background Interference
Matrix.</p>


<p><a href="NED?action=retrieve&amp;identifier=dn04177859&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_2#ned_2" onclick="sync(this);return true" shape="rect">Background Interference Matrix (BIM) update process</a></p>


<p><a href="NED?action=retrieve&amp;identifier=dn04177859&amp;edition=1&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">DFCA channel allocation algorithm</a></p>


<p><a href="NED?action=retrieve&amp;identifier=dn04177859&amp;edition=1&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">DFCA frequency hopping mode</a></p>


<p><a href="NED?action=retrieve&amp;identifier=dn04177859&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_5#ned_5" onclick="sync(this);return true" shape="rect">BSC-BSC interface</a></p>


<p><a href="NED?action=retrieve&amp;identifier=dn04177859&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_6#ned_6" onclick="sync(this);return true" shape="rect">Forced HR mode</a></p>


<p><a href="NED?action=retrieve&amp;identifier=dn04177859&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_7#ned_7" onclick="sync(this);return true" shape="rect">Automatic recovery</a></p>
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