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<div class="div">
<h1>Overview of EGPRS Packet Channel Request on CCCH</h1>

<p>When the MS wants to send data or upper layer signalling
messages to the network, it requires the establishment of an uplink TBF from
the BSC.</p>


<p>With EGPRS terminals, this has typically been done as two
phase access on CCCH where the MS first requests an RLC block from the BSC
and after it has been assigned, the MS provides information about its EGPRS
capabilities. Based on that information, a Packet Data Channel, if available,
is assigned for the TBF and the MS is instructed with attributes to be used
in uplink transmission by BSC.</p>


<p>By using EGPRS Packet Channel Request on CCCH the uplink
TBF establishment can be speeded up substantially since one phase access is
also available for an EGPRS MS. The MS provides information about its EGPRS
capabilities already while requesting TBF establishment from the BSC. Based
on this information the BSC can assign a Packet Data Channel for the TBF right
away, if one is available.</p>


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<h2>Benefit
of Nokia solution</h2>

<p>Fast uplink TBF establisment for EGPRS terminals on CCCH.</p>
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<h2>Interaction
with other features</h2>

<p>Corresponding feature is available with PBCCH/PCCCH
from the S10.5 ED release onwards.</p>


<p>For more information, see <em>(E)GPRS in
BSC</em>.</p>
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<h2>Related
topics</h2>

<p><a href="NED?action=retrieve&amp;identifier=dn03536767&amp;edition=3&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=nov2031428442#nov2031428442" onclick="sync(this);return true" shape="rect">System impact of EGPRS Packet Channel Request
on CCCH</a></p>
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