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<h1>Overview of IMSI Based Handover</h1>

<p>The IMSI Based Handover enables handover control according to the identity
(IMSI) of a subscriber, between networks of different operators. If a mobile
subscriber belongs to a Subscriber Group (SG) and its IMSI can be recognised,
it is possible to make handovers to either the GSM networks or the WCDMA networks.</p>


<p>With IMSI Based Handover, a mobile subscriber in a visited
network can be commanded to measure selectively only specified PLMN cells
and to make handover accordingly to those specified (home or authorised) PLMNs.
The input for the selective measurement control is the PLMN id that is included
in the IMSI (International Mobile Subscriber Identity) of the
subscriber.</p>


<p>With IMSI Based Handover, using Authorized Networks (ANE)
Lists and Subscriber Groups, a Host GSM Operator is able to define that BSC
performs handovers only to the cells that are permitted for the subscriber.
Each of Subscriber Groups is attached to a Authorized Networks (ANE) List,
which contains all network PLMN identifiers of the alliance </p>


<p>The networks involved in IMSI Based Handover can be GSM
or other radio technology networks, for example WCDMA networks. The IMSI-Based
Handover application software consists of two parts depending on which network
type the handover is directed to:</p>


<ul>
<li><p>Support for IMSI-Based GSM-GSM Handover</p>
</li>
<li><p>Support for IMSI-Based GSM-WCDMA Inter-System Handover</p>
</li>
</ul>


<p>IMSI Based Handover is an application SW product and requires a valid
licence in the BSC.</p>


<p><a href="NED?action=retrieve&amp;identifier=dn04111074&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_2#ned_2" onclick="sync(this);return true" shape="rect">IMSI Based Handover from GSM to GSM</a></p>


<p><a href="NED?action=retrieve&amp;identifier=dn04111074&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_3#ned_3" onclick="sync(this);return true" shape="rect">IMSI Based Handover from GSM to WCDMA</a></p>


<p><a href="NED?action=retrieve&amp;identifier=dn04111074&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_4#ned_4" onclick="sync(this);return true" shape="rect">WCDMA–GSM cell re-selection and inter-system handover</a></p>


<p><a href="NED?action=retrieve&amp;identifier=dn04111074&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_5#ned_5" onclick="sync(this);return true" shape="rect">Benefits of IMSI-Based Handover</a></p>
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