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<div class="div">
<h1>Coding Schemes CS-3 and CS-4</h1>

<p>GPRS provides four coding schemes, from CS-1 to CS-4. In previous BSS
releases only CS-1 and CS-2 GPRS coding schemes were supported because of
Abis frame restrictions. The introduction of Dynamic Abis makes it possible
to use CS-3 and CS-4. </p>


<p>CS1 and CS2 offer data rates of 8.0 and 12.0 kbps per timeslot. With
the rates of 14.4 and 20.0 kbps, CS-3 and CS-4 provide a considerable gain
in data rates for GPRS mobile stations not supporting EGRPS (the mandatory
RLC header octets are excluded from the data rate values).</p>


<p>CS-3 and CS-4 can boost the GPRS throughput bit rates by a maximum of
60% compared to CS-1 &amp; CS-2. With average real network conditions (average
C/I value distribution) a throughput increase of 0-30% can be achieved depending
on the network’s C/I values.</p>


<p>The Coding Schemes CS-3 and CS-4 can be implemented in two alternative
ways. It is possible to use CS-3 and CS-4 in both GPRS and EGPRS territories
or, alternatively, only in a EGPRS territory.</p>


<a name="jul154152351" shape="rect"></a>
<div class="topic">
<h2>Related topics</h2>

<ul>
<li><p><em>GPRS System Feature Description</em></p>
</li>
<li><p><em>EGPRS System Feature Description</em></p>
</li>
</ul>


<p>In BSC/TCSM documentation, see</p>


<ul>
<li><p><em>GPRS Handling in BSC</em></p>
</li>
<li><p><em>79 Coding Scheme Measurement</em></p>
</li>
</ul>
</div>


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<div class="topic">
<h2>Requirements</h2>

<p>The hardware and software requirements of Coding Schemes CS-3 and CS-4
are specified in the tables below.</p>


<p>Coding Schemes CS-3 and CS-4 is an application software product and
requires a valid licence in the BSC. All GPRS-capable mobile stations support
CS-3 and CS-4.</p>


<a name="p2xhtm-repid-4" shape="rect"></a>
<div>
<p>Table: Required additional or alternative hardware or firmware</p>


<table border="1">
<thead>
<tr align="left" char="" charoff="50" valign="bottom">
<th colspan="1" rowspan="1" valign="top"><p>Network element</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>HW/FW required</p>
</th>
</tr>
</thead>
<tbody>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>BSC </p>
</td>
<td colspan="1" rowspan="1"><p>PCU2</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>BTS </p>
</td>
<td colspan="1" rowspan="1"><p>The BaseBand HW of the BTS must support Dynamic Abis. EDGE
capable TRXs required.</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>TCSM </p>
</td>
<td colspan="1" rowspan="1"><p>No requirements</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>SGSN </p>
</td>
<td colspan="1" rowspan="1"><p>No requirements</p>
</td>
</tr>
</tbody>
</table>
</div>


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<div>
<p>Table: Required software by network elements</p>


<table border="1">
<thead>
<tr align="left" char="" charoff="50" valign="bottom">
<th colspan="1" rowspan="1" valign="top"><p>Network element</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>Software release required</p>
</th>
</tr>
</thead>
<tbody>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>BSC</p>
</td>
<td colspan="1" rowspan="1"><p>S11.5</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>Nokia UltraSite EDGE BTSs</p>
</td>
<td colspan="1" rowspan="1"><p>CX4.1</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>Nokia MetroSite EDGE BTSs</p>
</td>
<td colspan="1" rowspan="1"><p>CXM4.1</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>Nokia 2nd Gen. BTSs</p>
</td>
<td colspan="1" rowspan="1"><p>Does not support this SW product</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>Nokia Talk-family BTSs</p>
</td>
<td colspan="1" rowspan="1"><p>Does not support this SW product</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>Nokia PrimeSite BTSs</p>
</td>
<td colspan="1" rowspan="1"><p>Does not support this SW product</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>Nokia InSite BTSs</p>
</td>
<td colspan="1" rowspan="1"><p>Does not support this SW product</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>MSC/HLR</p>
</td>
<td colspan="1" rowspan="1"><p>Not applicable</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>SGSN</p>
</td>
<td colspan="1" rowspan="1"><p>Not applicable</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>Nokia NetAct</p>
</td>
<td colspan="1" rowspan="1"><p>OSS4</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>


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<div class="topic">
<h2>User interface</h2>

<p>Coding Schemes CS-3 and CS-4 cannot be managed with BTS MMI. </p>


<p>The following BSC MML commands are used to manage Coding Schemes CS-3
and CS-4:</p>


<ul>
<li><p><span class="command-sem">EQV</span></p>
</li>
<li><p><span class="command-sem">EQO</span></p>
</li>
</ul>


<p>The following BTS radio network object parameters are introduced due
to Coding Schemes CS-3 and CS-4:</p>


<ul>
<li><p><span class="parameter-sem">Coding Schemes CS3 And CS4 Enabled</span></p>
</li>
<li><p><span class="parameter-sem">DL Coding Scheme in Acknowledged Mode</span></p>
</li>
<li><p><span class="parameter-sem">UL Coding Scheme in Acknowledged Mode</span></p>
</li>
<li><p><span class="parameter-sem">DL Coding Scheme in Unacknowledged Mode</span></p>
</li>
<li><p><span class="parameter-sem">UL Coding Scheme in Unacknowledged Mode</span></p>
</li>
<li><p><span class="parameter-sem">Adaptive LA Algorithm</span></p>
</li>
</ul>


<p>Due to a new Link Adaptation algorithm the following existing parameters
are no longer relevant when CS-3 and CS-4 is used:</p>


<ul>
<li><p><span class="parameter-sem">PCU CS Non Hopping</span></p>
</li>
<li><p><span class="parameter-sem">PCU CS Hopping</span></p>
</li>
</ul>


<p>For more information on the parameters, see <em>BSS Radio Network
Parameter Dictionary</em> in BSC/TCSM documentation.</p>


<p>Also note that the values of the following MS-specific flow control
parameters must be increased due to CS-3 and CS-4:</p>


<ul>
<li><p><span class="parameter-sem">FC_MS_B_MAX_DEF</span></p>
</li>
<li><p><span class="parameter-sem">FC_MS_R_DEF</span></p>
</li>
<li><p><span class="parameter-sem">FC_R_TSL</span>.</p>
</li>
</ul>


<p>For more information on the parameters, see <em>PRFILE and FIFILE
Parameter List</em> in the BSC/TCSM documentation.</p>


<p>The following new alarm is introduced due to Coding Schemes CS-3 and
CS-4:</p>


<ul>
<li><p><span class="alarm-sem">3273 (E)GPRS TERRITORY FAILURE</span></p>
</li>
</ul>


<p>Two new object values are added to the Coding Scheme Measurement due
to Coding Schemes CS-3 and CS-4. No new counters are needed.</p>
</div>


<a name="dec294918223" shape="rect"></a>
<div class="topic">
<h2>Interworking with other features</h2>

<p>CS-3 and CS-4 do not fit to one 16kbit/s Abis/PCU channel and require
the use of Dynamic Abis and EDGE TRX.</p>
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