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<div class="div">
<h3>UE Tx power</h3>

<p>The UE Tx power measurement report can be used to trigger
inter-system handover measurements when the transmission power of the UE approaches
either its maximum RF output power capability or the maximum Tx power level
the UE can use on the DPCH.</p>


<p>The parameter <span class="parameter-sem">GSMcauseTxPwrUL</span>
controls whether an inter-system handover to GSM caused by UE Tx power is
enabled. In addition, the maximum allocated user bitrate on the uplink DPCH
must be lower than or equal to the bitrate threshold which is controlled with
RNP parameter <span class="parameter-sem">HHoMaxAllowedBitrateUL</span>, before the
RNC starts the inter-system (GSM) measurement due to UE Tx power.</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">GSMcauseTxPwrUL</span></p>
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<td colspan="1" rowspan="1"><p>0 (Not used)</p>
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<td colspan="1" rowspan="1"><p><span class="parameter-sem">HhoMaxAllowedBitrateUL</span></p>
</td>
<td colspan="1" rowspan="1"><p>32 kbit/s</p>
</td>
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<p>The measurement reporting for UE Tx power is based on the
reporting event 6A – The transmission power of the UE becomes greater than
an absolute threshold.</p>


<p><em>Reporting event 6A:</em> The UE Tx
power measurement is used to trigger off inter-frequency or inter-system (GSM)
measurements when the uplink transmission power of the mobile station approaches
its maximum power capability. The control parameters used by the event 6A
are:</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">GsmUETxPwrFilterCoef</span></p>
</td>
<td colspan="1" rowspan="1"><p>8</p>
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<td colspan="1" rowspan="1"><p><span class="parameter-sem">GsmUETxPwrThrAMR</span></p>
</td>
<td colspan="1" rowspan="1"><p>-1 dB</p>
</td>
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<td colspan="1" rowspan="1"><p><span class="parameter-sem">GsmUETxPwrThrNrtPS</span></p>
</td>
<td colspan="1" rowspan="1"><p>-1 dB</p>
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<td colspan="1" rowspan="1"><p><span class="parameter-sem">GsmUETxPwrThrRtPS</span></p>
</td>
<td colspan="1" rowspan="1"><p>-3 dB</p>
</td>
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<td colspan="1" rowspan="1"><p><span class="parameter-sem">GsmUETxPwrThrCS</span></p>
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<td colspan="1" rowspan="1"><p>-3 dB</p>
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<td colspan="1" rowspan="1"><p><span class="parameter-sem">GsmUETxPwrTimeHyst</span></p>
</td>
<td colspan="1" rowspan="1"><p>1280 ms</p>
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<p>The UE Tx power threshold defines the absolute threshold
which is used by the UE to trigger the reporting event 6A. The threshold is
calculated in the following way:</p>


<ul>
<li><p>UE Tx power threshold = min(UE_TXPWR_MAX_DPCH,
P_MAX) + UE_TXPWR_THRESHOLD</p>
</li>
</ul>


<p>UE_TXPWR_MAX_DPCH indicates the maximum Tx power level
(dBm) a UE can use on the DPCH. P_MAX indicates the maximum RF output power
capability of the UE (dBm). UE_TXPWR_THRESHOLD (dB) is controlled with the
threshold parameters found in the table above.</p>


<p>If the UE Tx power becomes greater than the reporting threshold
(6A), the UE sends the measurement report to the RNC.</p>


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<dl class="note-notification">
<dt class="note-caption">Note</dt>
<dd>The RNC does not break off ongoing inter-system (GSM) measurement
even if the UE Tx power decreases again below the reporting threshold and
the mobile station sends the corresponding measurement report (event 6B) to
the RNC.</dd>
</dl>
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