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<h1>C/I-Based Handover Candidate Evaluation</h1>

<p>C/I-Based Handover Candidate Evaluation is a feature designed
to direct mobile stations to cells, which can provide interference-free service
at the current location of each mobile station and in that way improve the
quality of service.</p>


<p>The C/I estimation is based on the radio measurements.
The feature is tuned by various adjustable parameters related to the correlated
behaviour of the radio network.</p>


<p>The BSC calculates the potential C/I ratio for handover
candidate cell at the current location of the mobile station by comparing
the transmitted downlink signal level of the handover candidate cell (carrier)
and the measured downlink signal level of those adjacent cells which may have
a high correlation to co- or adjacent channel interference. The interfering
cells can be defined independently for each handover candidate (adjacent)
cell.</p>


<p>The BSC ranks the handover candidate cells, which meet
the required radio link properties according to priority levels. The potential
co- or adjacent channel interference in a handover candidate cell affects
the order of preference of the target cells through the priority level of
the cell:</p>


<ul>
<li><p>Small or non-existent interference
in the cell keeps the priority of the handover candidate cell unchanged or
if required increases the priority of the handover candidate cell</p>
</li>
<li><p>Bad interference in the cell reduces
the priority of the handover candidate cell or if required the BSC removes
the cell from the list of preferred handover candidates.</p>
</li>
</ul>
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