<?xml version="1.0" encoding="utf-8" standalone="yes"?><html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>GPRS in Nokia Base Stations</title>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
<meta content="text/css" http-equiv="Content-Style-Type" />
<script src="NED?action=retrieve&amp;identifier=dn00188761&amp;edition=1&amp;language=none&amp;coverage=global&amp;encoding=javascript&amp;component=data&amp;item=data" type="text/javascript" xml:space="preserve">
</script>
<?conversion name="Pub2XHTML" version="2.0" source="urn:mars:dn04111386:1:en:global:publishing_online_1_0:data:data:*:*:*" date="2005-02-21T15:41:19Z"?>
<link href="NED?action=retrieve&amp;identifier=dn01158124&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=css&amp;component=data&amp;item=data" rel="stylesheet" title="Nokia Networks default online style" type="text/css" />
<meta content="draft" name="status" />
<?conversion name="SplitHTML" version="1.9" source="urn:mars:dn04111386:1:en:global:publishing_online_1_0:data:data:53:*:*" date="2005-02-21T15:41:19Z"?>
</head>
<body lang="en" xml:lang="en">
<p><a name="mar5412583410" shape="rect"></a>
<a name="ned_8" shape="rect"></a></p>

<div class="div">
<table width="100%">
<tr>
<td align="center" colspan="1" rowspan="1" width="20%"><?NED5 annotation?>
<br clear="none" /><?NED5 printview?>
</td>
<td align="center" colspan="1" rowspan="1" width="20%"></td>
<td align="center" colspan="1" rowspan="1" width="20%"></td>
<td align="center" colspan="1" rowspan="1" width="20%"><a href="NED?action=retrieve&amp;identifier=dn04111386&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_1#ned_1" onclick="sync(this);return true" shape="rect">Overview of Nokia GPRS</a></td>
<td align="center" colspan="1" rowspan="1" width="20%"><a href="NED?action=retrieve&amp;identifier=dn04111386_about&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_top#ned_top" onclick="openSmallPopup(event,'NED?action=retrieve&amp;identifier=dn04111386_about&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_top#ned_top');return false" shape="rect" target="_blank"><img alt="Document information" border="0" class="Metainfo" src="NED?action=retrieve&amp;identifier=dn01158003&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /></a></td>
</tr>
</table>


<div class="div">
<h2>GPRS in Nokia Base Stations</h2>

<p>Radio resources are allocated by the BSC (PCU). The BCCH/CCCH
and PBCCH/PCCH are scheduled by the BTS; messages are routed via TRXSIG link
between the BTS and BSC. The PBCCH/PCCCH is not supported in the first GPRS
release. GPRS data itself is transparent to the BTS; routed via TCH channels
in Abis.</p>


<p>The CCU (Channel Coding Unit) in the BTS DSP will perform
the channel coding for the following rates:</p>


<p>CS-1 (Channel Coding Scheme 1) 	- 9.05 kb/s</p>


<p>CS-2 (Channel Coding Scheme 2) 	- 13.4 kb/s</p>


<p>In Packet Transfer Mode, the MS will use the continuous
timing advance update procedure. The procedure is carried out on all PDCH
time slots. The mapping in time of these logical channels is defined by a
multi-frame structure. It consists of 52 TDMA frames, divided into 12 blocks
(of four frames) and four idle frames.</p>
</div>
</div>
</body>
</html>