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

<p>The GPRS packet core comprising the Serving GPRS Support Node (SGSN),
Gateway GPRS Support Node (GGSN), Charging Gateway (CG) and IP backbone will
continue to be used when EDGE is introduced in the GSM network. Support for
EDGE functions is available starting from GPRS core release 2, which involves
upgrades to the SGSN, GGSN and CG.</p>


<p>Nokia’s MSC/HLR supports enhanced data rates for EGPRS. M11 is required
to support EGPRS service subscription and QoS parameters.</p>


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<p>GPRS architecture provides IP connectivity from a Mobile Station (MS)
to an external fixed IP network. A Quality of Service (QoS) is defined for
each radio access bearer that serves a connection. The parameters include
priority, reliability, delay, and maximum and mean bit rates. A specified
combination of these parameters defines a bearer, and different bearers are
selected to suit the needs of different applications. Nokia EDGE requires
an updated parameter space for the QoS parameters. Higher layer protocols,
such as those used by the GGSN and the SGSN, remain the same. With these methods,
Nokia EDGE delivers enhanced data rates up to a theoretical maximum of 473
kbps using the same infrastructure as in GPRS.</p>


<p><em>EDGE impact on CS charging</em></p>


<p>New EDGE-specific values are introduced in the channel_coding fields.
No new Charging Data Recods (CDRs) or fields have been added.</p>


<p>New values added to the following CDRs:</p>


<ul>
<li><p>Mobile Originated Call CDR</p>
</li>
<li><p>Mobile Terminated Call CDR</p>
</li>
<li><p>Unsuccessfull Call Attempt CDR.</p>
</li>
</ul>
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