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<h1>TSC Different from BCC</h1>

<p>According to the GSM standard 05.02, "for broadcast and
common control channels, the TSC must be equal to the BCC.” For some configurations,
using the TSC different from the BCC on the TCH and SDCCH channels situated
in TS0 would allow to avoid Random Access interference. For example: a Random
access sent on the TCH on TS0 (for handover) could be detected as valid on
the RACH. Apparently, this could happen when frequency channels in use in
the TS0 in non-BCCH TRX are quite close to the BCCH frequency channel (400
kHz or 600 kHz spacing).</p>


<p>Previously, with Nokia implementation, it is not possible
to configure the TCS differently from the BCC on non-BCCH TRXs. This feature
removes that constraint. An exception for this limitation is the BCCH and
PBCCH TRXs and also the Base Band hopping cell (or the Base band hopping layer
in the IUO case).</p>


<p>This would lead to following network quality improvements:</p>


<ul>
<li><p>Less Ghost CHANNEL REQUEST on RACH
=&gt; better SDCCH efficiency</p>
</li>
<li><p>Less misbehaviour on TS 0 during handovers.</p>
</li>
</ul>
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