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<title>GSM cell measurements for WCDMA-GSM inter-system handover</title>
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<h2>GSM cell measurements for WCDMA-GSM inter-system handover</h2>

<p>The inter-system (GSM) measurement procedure is controlled
with the following parameters:</p>


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<th colspan="1" rowspan="1" valign="top"><p>Parameter</p>
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<th colspan="1" rowspan="1" valign="top"><p>Setting</p>
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<td colspan="1" rowspan="1"><p><span class="parameter-sem">GsmMeasRepInterval</span></p>
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<td colspan="1" rowspan="1"><p>2 (0.5 s)</p>
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<td colspan="1" rowspan="1"><p><span class="parameter-sem">GsmNcellSearchPeriod</span></p>
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<td colspan="1" rowspan="1"><p>0 MeasReport</p>
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<td colspan="1" rowspan="1"><p><span class="parameter-sem">GsmMaxMeasPeriod</span></p>
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<td colspan="1" rowspan="1"><p>20 MeasReport</p>
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<td colspan="1" rowspan="1"><p><span class="parameter-sem">GsmMinMeasInterval</span></p>
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<td colspan="1" rowspan="1"><p>10 s</p>
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<td colspan="1" rowspan="1"><p><span class="parameter-sem">GsmMinHoInterval</span></p>
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<td colspan="1" rowspan="1"><p>10 s</p>
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<p><span class="parameter-sem">GsmMeasRepInterval</span> determines
the measurement reporting interval for periodical inter-system (GSM) measurements.</p>


<p><span class="parameter-sem">GsmNcellSearchPeriod</span> determines
the number of periodical inter-system (GSM) measurement reports, starting
from the first report after the measurement setup, during which a handover
to GSM is not possible. This period allows the UE to find and report all potential
GSM neighbour cells before the handover decision.</p>


<p><span class="parameter-sem">GsmMaxMeasPeriod</span> defines the
maximum allowed duration of the measurement by means of the maximum number
of periodical inter-system (GSM) measurement reports during the measurement.
If the RNC is not able to execute the handover to GSM, it stops the GSM measurement
after the UE has sent the predefined number of measurement reports to the
RNC.</p>


<p><span class="parameter-sem">GsmMinMeasInterval</span> determines
the minimum interval between an unsuccessful inter-system (GSM) measurement
or handover procedure and the following GSM measurement procedure related
to the same RRC connection. Repetitive GSM measurements are disabled when
the value of the parameter is zero.</p>


<p><span class="parameter-sem">GsmMinHoInterval</span> determines
the minimum interval between a successful inter-system handover from GSM to
UTRAN and the following inter-system handover attempt back to GSM related
to the same RRC connection. A return handover back to GSM is disabled when
the value of the parameter is zero.</p>


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