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<h3>Handover delay</h3>

<p>Before executing the handover, the RNC commands the UE
to perform the GSM Carrier RSSI measurements. The UE using is also given the
set of parameters defining the compressed mode pattern specific to that service.
In this section the delay requirements are estimated.</p>


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<p>As the figure above shows, the process carried during the
compressed mode involves the measurement duration of the GSM carrier. Once
the measurements are performed, the RNC ranks the cells according to the received
measurements (Highest RSSI having best priority) and sends a message to perform
the <a href="NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id05218#id05218" onclick="openSmallPopup(event,'NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id05218#id05218');return false" shape="rect" target="_blank">BSIC</a> identification.</p>


<p><em>BSIC Verification:</em> The next step
is identifying the BSIC. This measurement is based on a transmission gap pattern
sequence with the purpose "GSM Initial BSIC identification".</p>


<p>For the GSM cells that are requested with the verified
BSIC, the UE attempts to decode the SCH on the BCCH carrier of the 8 strongest
BCCH carriers of the GSM cells indicated in the measurement control information.</p>


<p>The parameter <span class="parameter-sem">GSM Max Meas Period</span>
tells the time that the RNC waits before sending a command to execute the
inter-system handover. The default value of the parameter is 20 measurement
reports, which indicates a duration of 10 seconds. Hence, during 10 seconds
of measurement, if the UE does not report a suitable neighbour candidate to
the RNC, the compressed mode is aborted. On expiration of this timer the HC
entity of the RNC commands the UE to abort the compressed mode.</p>


<p><a href="NED?action=retrieve&amp;identifier=dn02210994&amp;edition=5&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=nov1521223413#nov1521223413" onclick="sync(this);return true" shape="rect">Overview of GSM-WCDMA Inter-System Handover</a></p>
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