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Positioning</a></td>
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<h2>Lb interface</h2>

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<h3>Signalling
between BSC and stand-alone SMLC</h3>
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<p>The signalling between the BSC and the stand-alone SMLC
is done with the BSSMAP-LE and Lb+ (Nokia-specific) messages. The Lb messages
are described in the 49.031 ETSI Rel4 standard.</p>


<p>The BSSLAP messages between the BSC and the stand-alone
SMLC are transported embedded in the BSSMAP-LE message data.</p>


<p>BSSMAP-LE PERFORM LOCATION REQUEST</p>


<p>This is the location request message between the BSC and
the stand-alone SMLC. If <span class="parameter-sem">LB_OPTIMIZATION</span>
parameter is active, the BSC sends BSSLAP UTDOA Response instead of BSSLAP
Layer 3 information in BSSLAP APDU.</p>


<p>BSSMAP-LE PERFORM LOCATION RESPONSE</p>


<p>This is the location response message between the BSC and
the stand-alone SMLC. New positioning method is introduced.</p>


<p>BSSMAP-LE CONNECTION ORIENTED INFORMATION</p>


<p>This message includes connection-oriented information between
the BSC and the stand-alone SMLC, that is, BSSLAP messages. If <span class="parameter-sem">LB_ OPTIMIZATION</span> parameter is not active, the stand-alone
SMLC requests radio channel information with BSSLAPUTDOA Request message.
The BSC sends BSSLAP UTDOA Response as a response to the request.</p>


<p>For more information, see <em>Location Services
in BSC</em> in the BSC/TCSM documentation set.</p>


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<h3>BSSLAP
protocol</h3>
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<p>BSSLAP protocol is used embedded in the BSSMAP-LE protocol
(3GPP 48.071 Release 6). Two new messages are introduced to the BSSLAP protocol
for Support for US emergency call (E911) positioning. Also, the Existing BSSLAP
Reset is modified.</p>


<p>UTDOA REQUEST</p>


<p>This is a message from the stand-alone SMLC to the BSS.
It contains the Delta timer information elements. The Delta timer is not used
in Nokia BSS.</p>


<p>UTDOA RESPONSE</p>


<p>This is a message from the BSS to the stand-alone SMLC.
It is a response to the US emergency call position (E911) system Request message.
The message contains the following information elements: Channel Description,
Channel Mode, Multirate Configuration, Serving Cell Identifier, Frequency
List, Timing Advance, MS Power, Measurement Report, Encryption Key and Cipher
Mode Setting.</p>


<p>RESET</p>


<p>This is a message from the BSS to the stand-alone SMLC.
It is sent when the Response message contents for a positioning request are
invalidated before the positioning procedure was completed. The message contains
the following information elements: Cell ID, Timing Advance, Channel Description,
Channel Mode, Multirate Configuration, Cause, Measurement Report or Enhanced
Measurement Report, Measured Cell Identity List, LAC, and Frequency List.</p>


<p>For more information on Support for US Emergency Call (E911)
Positioning, see <a href="NED?action=retrieve&amp;identifier=dn03516136&amp;edition=2&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=dec531259541#dec531259541" onclick="sync(this);return true" shape="rect">Overview of Support for US Emergency Call (E911) Positioning</a>
or <a href="NED?action=retrieve&amp;identifier=dn03516148&amp;edition=2&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=dec53130251#dec53130251" onclick="sync(this);return true" shape="rect">Functionality
of Support for US Emergency Call (E911) Positioning</a>. See also <em>BSC-SMLC
Interface Specification</em> in BSC/TCSM documentation.</p>
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