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<h1>SDCCH dimensioning with Common BCCH</h1>

<p>Consider the multi-band mobile and the following two scenarios:</p>


<p>Case 1: GSM Network with separated cells <a href="NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id012008#id012008" onclick="openSmallPopup(event,'NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id012008#id012008');return false" shape="rect" target="_blank">GSM
900</a>/800 and <a href="NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id012006#id012006" onclick="openSmallPopup(event,'NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id012006#id012006');return false" shape="rect" target="_blank">GSM 1800</a>/<a href="NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id012007#id012007" onclick="openSmallPopup(event,'NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id012007#id012007');return false" shape="rect" target="_blank">1900</a></p>


<p>Case 2: Common BCCH GSM Network (GSM 900/800 and GSM 1800/1900 <a href="NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id03816#id03816" onclick="openSmallPopup(event,'NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id03816#id03816');return false" shape="rect" target="_blank">BTSs</a> co-located).</p>


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<th colspan="1" rowspan="1" valign="top"><p>Case 1 </p>
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<th colspan="1" rowspan="1" valign="top"><p>Case 2</p>
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<li><p>2 <a href="NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id04885#id04885" onclick="openSmallPopup(event,'NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id04885#id04885');return false" shape="rect" target="_blank">TRXs</a>/cell (1%
blocking), 8.11 Erl/cell</p>
</li>
<li><p><a href="NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id013530#id013530" onclick="openSmallPopup(event,'NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id013530#id013530');return false" shape="rect" target="_blank">Traffic density</a>
25 mErl/subs, 325 subs/cell</p>
</li>
<li><p>Call establishment time:</p>


<p><a href="NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id011274#id011274" onclick="openSmallPopup(event,'NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id011274#id011274');return false" shape="rect" target="_blank">SDCCH</a> reservation time 7 sec/call,
1.94 mErl/call, 325 calls/hour/cell x 1.94 mErl/call = 0.631 Erl/cell (SDCCH)</p>
</li>
<li><p>Location update (once in 60 minutes),
325 subs/cell x 1.94 mErl/call = 0.631 Erl/cell (SDCCH)</p>
</li>
<li><p>SDCCH capacity = 0.631 + 0.631 =1.262
Erl/cell</p>
</li>
<li><p>Number of SDCCH channels/cell = 5 </p>
</li>
</ul>


<p>5 SDCCH channels are necessary for each BTS. So a separated
channel configuration is needed for each BTS (TS0 is dedicated for the <a href="NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id04445#id04445" onclick="openSmallPopup(event,'NED?action=retrieve&amp;identifier=general_glossary&amp;edition=13&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=id04445#id04445');return false" shape="rect" target="_blank">BCCH</a> channel and TS 1 for SDCCH channels).</p>
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<li><p>4 TRXs in a segment (1% blocking),
20.33 Erl/cell</p>
</li>
<li><p>Traffic density 25 mErl/subs, 813 subs/cell</p>
</li>
<li><p>Call establishment time:</p>


<p>SDCCH reservation time 7 sec/call, 1.94 mErl/call, 813
calls/hour/cell x 1.94 mErl/call = 1.58 Erl/Call (SDCCH)</p>
</li>
<li><p>Location update (1.4 times in 60 minutes
due to smaller location area compare with 2 TRXs/cell), 813 calls/cell x 1.4
x 1.94 mErl/call = 2.2 Erl/Cell (SDCCH)</p>
</li>
<li><p>SDCCH capacity = 1.58 Erl/Cell + 2.2
Erl/Cell = 3.8 Erl/Cell</p>
</li>
<li><p>Number of SDCCH channels = 10</p>
</li>
</ul>


<p>A separated configuration is needed, with 2 TS for SDCCH
on the BCCH layer.</p>
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<p><a href="NED?action=retrieve&amp;identifier=dn02222031&amp;edition=5&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_top#ned_top" onclick="sync(this);return true" shape="rect">Overview of GSM/EDGE Common BCCH</a></p>
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