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<h2>Impact on interfaces</h2>

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<h3>Impact on Abis interface</h3>

<p>Changes:</p>


<ul>
<li><p>Dynamic Abis</p>
</li>
<li><p>Support for EGPRS messages</p>
</li>
</ul>


<p>Dynamic Abis pools need to be configured.</p>
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<h3>Impact on A interface</h3>

<p>No impact.</p>
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<h3>Impact on Gb interface</h3>

<p>Nokia BSC supports Gb interface (BSC-SGSN) in S10.5 ED as specified
in GSM Recommendations (3GPP):</p>


<ul>
<li><p>GSM 08.18, BSS-SGSN Interface, BSS GPRS Protocol, version 8.9.0.</p>
</li>
<li><p>GSM 08.16, BSS-SGSN Interface, Network Service, version 8.0.0.</p>
</li>
</ul>


<p><em>BSSGP Flow Control for BVC and MS:</em></p>


<p>BVC and MS Specific Bucket Sizes and Leak Rates are enhanced due to
higher EGPRS throughput. When an EGPRS mobile uses EGPRS TBF in downlink data
transfer, EGPRS-specific parameters are used in Flow Control calculations.
If an EGPRS mobile uses normal GPRS TBF, Flow Control uses GPRS-specific parameters
for calculating BVC and MS Bucket Sizes and Leak Rates.</p>


<p>There are four EGPRS-specific PRFILE parameters for the Gb interface.
See <em>User interface</em> for details.</p>
</div>


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<h3>Impact on Gs interface</h3>

<p>The Gs interface is specified as optional by 3GPP but Nokia SGSN and
MSC support the Gs interface (SGSN-MSC/VLR) from the very beginning.</p>


<p>The advantages of Gs interface include:</p>


<ul>
<li><p>support for TIA/EIA-136 networks by offering connection for tunneling
of non-GSM signalling messages via GPRS network to a non-GSM MSC/VLR</p>
</li>
<li><p>more effective radio resource usage with combined GPRS/IMSI Attach/Detach
and combined RA/LA updates, that is, reduced signalling over radio interface.</p>
</li>
<li><p>the possibility to page GPRS terminals also for circuit switched
services (for example circuit switched calls) via GPRS.</p>
</li>
</ul>
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