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<h1>C/I Ratio Statistics (C/I)</h1>

<p>The purpose of the C/I (carrier/interference) ratio measurement
is to estimate the level of the co- and adjacent channel interference in the
radio network. The interference estimation is based on the measurement results
reported by the MS via the BTS. The C/I ratio measurement helps the frequency
planning of the radio network.</p>


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<p>The C/I ratio statistics measurement collects statistics
of the degree of the interference by measuring traffic intensity (in Erlangs)
on a specified C/I ratio band. </p>


<p>The object of the C/I ratio statistics measurement is one
specified cell and one specified C/I ratio band. The object cell of the measurement
is called a test cell. The C/I ratio statistics measurement measures the traffic
intensity on the observed C/I ratio band (the part of the traffic where downlink/uplink
C/I ratio is within the observed C/I ratio band) by monitoring continuously
every call, which is ongoing in the test cell and in its interfering cells.
The interfering cells are composed of either all adjacent cells of the test
cell or a maximum of 6 specified adjacent cells of the test cell.</p>


<p>When the test cell is a serving cell, the measurement monitors
the downlink C/I ratio of the test cell by comparing the downlink signal level
of the test cell (carrier) and the downlink signal level of each interfering
cell (interference) on a cell-by-cell basis. The measurement also monitors
the uplink interference, which the call on a channel in the test cell causes
to each of the interfering cells.</p>


<p>When an interfering cell is a serving cell, the measurement
monitors the downlink C/I ratio of the interfering cell by comparing the downlink
signal level of the interfering cell (carrier) and the downlink signal level
of the test cell (interference), and the uplink interference, which the call
on a channel in the interfering cell causes to the test cell.</p>
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