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Positioning </title>
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<div class="div">
<h1>System impact of Support for US Emergency Call (E911)
Positioning </h1>

<p>The system impact of Support for US Emergency Call (E911)
Positioning is specified in the sections below. For an overview, see <em>Overview
of Support for US Emergency Call (E911) Positioning</em> in the final version
of the documentation.</p>


<p> Support for US Emergency Call (E911) Positioning is an application
software product and it is meant for emergency call positioning in US markets
only.</p>


<p> Lb interface is a licensed functionality. The licences of Lb interface
limit only the number of commercial LCS events. So Support for US Emergency
Call (E911) Positioning does not require any licences.</p>


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<dl class="note-notification">
<dt class="note-caption">Note</dt>
<dd>You must have valid licences if you send commercial calls to Lb interface.</dd>
</dl>


<p>For more information about Lb interface licensing and different licences,
see <em>Licence-based Feature Management</em> and <em>Licensing in BSC</em>
in BSC/TCSM documentation.</p>


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<h2>Impact on transmission</h2>

<p>No impact on transmission.</p>
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<p><a href="NED?action=retrieve&amp;identifier=dn03516463&amp;edition=3&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_6#ned_6" onclick="sync(this);return true" shape="rect">Impact on BSS performance</a></p>


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<h2>Impact on Network Switching Systems (NSS)</h2>

<p>The BSS can indicate U-TDOA positioning method to NSS in
the Positioning Data IE of the BSSMAP Perform Location Response message. The
used positioning method is also indicated in the LCS CDRs of the MSC.</p>
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<h2>Impact on mobile terminals</h2>

<p>No requirements for mobile terminals.</p>
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