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<h2>Level of service and rate reduction</h2>

<p>The concept of rate reduction can be used to estimate the
effect of GPRS load on typical user data. As shown in section <a href="NED?action=retrieve&amp;identifier=dn02256921&amp;edition=5&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=mar2441358511#mar2441358511" onclick="sync(this);return true" shape="rect">(E)GPRS
occupancy levels and data throughput</a>, the user data rates typically
decrease as the GPRS load increases. A way of quantifying this is by using
the effective reduction from the rate achievable at low load for the given
GPRS territory occupancy.</p>


<p>Table <em>Rate reduction effects of GPRS territory occupancy</em>
shows typical values for the rate reduction factors. Note, however, that the
actual values vary according to the traffic profile:</p>


<ul>
<li><p>N=Ns/Nu, where:</p>


<ul>
<li><p>Ns= average number of TSL available for (E)GPRS</p>
</li>
<li><p>Nu= average number of TSLs allocated to the MS.</p>
</li>
</ul>
</li>
</ul>


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<p>Table: Rate reduction effects of GPRS territory occupancy </p>


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<thead>
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<th colspan="1" rowspan="1" valign="top"><p>Reduction factor/N=NS/NU</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>Reduction factor 0.95</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>Reduction factor 0.8</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>Reduction factor 0.6</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>Reduction factor 0.4</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>Reduction factor 0.2</p>
</th>
</tr>
</thead>
<tbody>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>1</p>
</td>
<td colspan="1" rowspan="1"><p>0.0967</p>
</td>
<td colspan="1" rowspan="1"><p>0.35</p>
</td>
<td colspan="1" rowspan="1"><p>0.6123</p>
</td>
<td colspan="1" rowspan="1"><p>0.8019</p>
</td>
<td colspan="1" rowspan="1"><p>0.9301</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>5/4</p>
</td>
<td colspan="1" rowspan="1"><p>0.1707</p>
</td>
<td colspan="1" rowspan="1"><p>0.4548</p>
</td>
<td colspan="1" rowspan="1"><p>0.6911</p>
</td>
<td colspan="1" rowspan="1"><p>0.8457</p>
</td>
<td colspan="1" rowspan="1"><p>0.9458</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>4/3</p>
</td>
<td colspan="1" rowspan="1"><p>0.1947</p>
</td>
<td colspan="1" rowspan="1"><p>0.4826</p>
</td>
<td colspan="1" rowspan="1"><p>0.7104</p>
</td>
<td colspan="1" rowspan="1"><p>0.8561</p>
</td>
<td colspan="1" rowspan="1"><p>0.9496</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>3/2</p>
</td>
<td colspan="1" rowspan="1"><p>0.2398</p>
</td>
<td colspan="1" rowspan="1"><p>0.53</p>
</td>
<td colspan="1" rowspan="1"><p>0.7421</p>
</td>
<td colspan="1" rowspan="1"><p>0.8729</p>
</td>
<td colspan="1" rowspan="1"><p>0.9556</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>5/3</p>
</td>
<td colspan="1" rowspan="1"><p>0.2807</p>
</td>
<td colspan="1" rowspan="1"><p>0.5686</p>
</td>
<td colspan="1" rowspan="1"><p>0.7669</p>
</td>
<td colspan="1" rowspan="1"><p>0.8859</p>
</td>
<td colspan="1" rowspan="1"><p>0.9602</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>7/4</p>
</td>
<td colspan="1" rowspan="1"><p>0.2996</p>
</td>
<td colspan="1" rowspan="1"><p>0.5854</p>
</td>
<td colspan="1" rowspan="1"><p>0.7773</p>
</td>
<td colspan="1" rowspan="1"><p>0.8914</p>
</td>
<td colspan="1" rowspan="1"><p>0.9622</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>2</p>
</td>
<td colspan="1" rowspan="1"><p>0.3502</p>
</td>
<td colspan="1" rowspan="1"><p>0.6274</p>
</td>
<td colspan="1" rowspan="1"><p>0.8031</p>
</td>
<td colspan="1" rowspan="1"><p>0.9047</p>
</td>
<td colspan="1" rowspan="1"><p>0.967</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>9/4</p>
</td>
<td colspan="1" rowspan="1"><p>0.3928</p>
</td>
<td colspan="1" rowspan="1"><p>0.6603</p>
</td>
<td colspan="1" rowspan="1"><p>0.8226</p>
</td>
<td colspan="1" rowspan="1"><p>0.9147</p>
</td>
<td colspan="1" rowspan="1"><p>0.9706</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>7/3</p>
</td>
<td colspan="1" rowspan="1"><p>0.4056</p>
</td>
<td colspan="1" rowspan="1"><p>0.6697</p>
</td>
<td colspan="1" rowspan="1"><p>0.8281</p>
</td>
<td colspan="1" rowspan="1"><p>0.9175</p>
</td>
<td colspan="1" rowspan="1"><p>0.9716</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>5/2</p>
</td>
<td colspan="1" rowspan="1"><p>0.429</p>
</td>
<td colspan="1" rowspan="1"><p>0.6866</p>
</td>
<td colspan="1" rowspan="1"><p>0.838</p>
</td>
<td colspan="1" rowspan="1"><p>0.9225</p>
</td>
<td colspan="1" rowspan="1"><p>0.9734</p>
</td>
</tr>
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